/*******************************************************************\
 * assistant-csv-price-import.cpp -- An assistant for importing     *
 *                                     Prices from a file.          *
 *                                                                  *
 * Copyright (C) 2017 Robert Fewell                                 *
 *                                                                  *
 * This program is free software; you can redistribute it and/or    *
 * modify it under the terms of the GNU General Public License as   *
 * published by the Free Software Foundation; either version 2 of   *
 * the License, or (at your option) any later version.              *
 *                                                                  *
 * This program is distributed in the hope that it will be useful,  *
 * but WITHOUT ANY WARRANTY; without even the implied warranty of   *
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the    *
 * GNU General Public License for more details.                     *
 *                                                                  *
 * You should have received a copy of the GNU General Public License*
 * along with this program; if not, contact:                        *
 *                                                                  *
 * Free Software Foundation           Voice:  +1-617-542-5942       *
 * 51 Franklin Street, Fifth Floor    Fax:    +1-617-542-2652       *
 * Boston, MA  02110-1301,  USA       gnu@gnu.org                   *
\********************************************************************/
/** @file assistant-csv-price-import.cpp
    @brief CSV Import Assistant
    @author Copyright (c) 2016 Geert Janssens
    @author Copyright (c) 2017 Robert Fewell
*/

#include <guid.hpp>

#include "config.h"

#include <gtk/gtk.h>
#include <glib/gi18n.h>
#include <stdlib.h>

#include "gnc-ui.h"
#include "gnc-uri-utils.h"
#include "gnc-ui-util.h"
#include "dialog-utils.h"

#include "gnc-component-manager.h"

#include "gnc-state.h"

#include "assistant-csv-price-import.h"

#include "gnc-csv-gnumeric-popup.h"
#include "go-charmap-sel.h"

#include <algorithm>
#include <exception>
#include <iostream>
#include <memory>
#include <string>
#include <tuple>

#include "gnc-imp-settings-csv-price.hpp"
#include "gnc-import-price.hpp"
#include "gnc-tokenizer-fw.hpp"
#include "gnc-tokenizer-csv.hpp"

#define MIN_COL_WIDTH 70
#define GNC_PREFS_GROUP "dialogs.import.csv"
#define ASSISTANT_CSV_IMPORT_PRICE_CM_CLASS "assistant-csv-price-import"

/* This static indicates the debugging module that this .o belongs to.  */
static QofLogModule log_module = GNC_MOD_ASSISTANT;

/* Note on memory management
 *
 * The same notes as for assistant-csv-trans-import.cpp apply to
 * this assistant as well. Please read the note at the top of that
 * file to understand important details about the use of several
 * memory management models in one file.
 */

class  CsvImpPriceAssist
{
public:
    CsvImpPriceAssist ();
    ~CsvImpPriceAssist ();

    /* Delete copy and move constructor/assignments
     * We don't want gui elements to be moved around or copied at all */
    CsvImpPriceAssist(const CsvImpPriceAssist&) = delete;            // copy constructor
    CsvImpPriceAssist& operator=(const CsvImpPriceAssist&) = delete; // copy assignment
    CsvImpPriceAssist(CsvImpPriceAssist&&) = delete;                 // move constructor
    CsvImpPriceAssist& operator=(CsvImpPriceAssist&&) = delete;      // move assignment

    void assist_prepare_cb (GtkWidget *page);
    void assist_file_page_prepare ();
    void assist_preview_page_prepare ();
    void assist_confirm_page_prepare ();
    void assist_summary_page_prepare ();
    void assist_finish ();
    void assist_compmgr_close ();

    void file_activated_cb ();
    void file_selection_changed_cb ();

    void preview_settings_delete ();
    void preview_settings_save ();
    void preview_settings_name (GtkEntry* entry);
    void preview_settings_load ();
    void preview_update_skipped_rows ();
    void preview_over_write (bool over);
    void preview_update_separators (GtkWidget* widget);
    void preview_update_file_format ();
    void preview_update_encoding (const char* encoding);
    void preview_update_date_format ();
    void preview_update_currency_format ();
    void preview_update_currency ();
    void preview_update_commodity ();
    void preview_reparse_col_type (GncPricePropType type);
    void preview_update_col_type (GtkComboBox* cbox);
    void preview_update_fw_columns (GtkTreeView* treeview, GdkEventButton* event);

    void preview_populate_settings_combo();
    void preview_handle_save_del_sensitivity (GtkComboBox* combo);
    void preview_split_column (int col, int offset);
    void preview_refresh_table ();
    void preview_refresh ();
    void preview_validate_settings ();

    friend gboolean
    fixed_context_menu_handler_price (GnumericPopupMenuElement const *element,
            gpointer userdata);
private:
    /* helper functions to manage the context menu for fixed with columns */
    uint32_t get_new_col_rel_pos (GtkTreeViewColumn *tcol, int dx);
    void fixed_context_menu (GdkEventButton *event, int col, int dx);
    /* helper function to calculate row colors for the preview table (to visualize status) */
    void preview_row_fill_state_cells (GtkListStore *store, GtkTreeIter *iter,
            std::string& err_msg, bool skip);
    /* helper function to create preview header cell combo boxes listing available column types */
    GtkWidget* preview_cbox_factory (GtkTreeModel* model, uint32_t colnum);
    /* helper function to set rendering parameters for preview data columns */
    void preview_style_column (uint32_t col_num, GtkTreeModel* model);
    /* helper function to check for a valid filename as opposed to a directory */
    bool check_for_valid_filename ();

    GtkAssistant    *csv_imp_asst;

    GtkWidget       *file_page;                     /**< Assistant file page widget */
    GtkWidget       *file_chooser;                  /**< The widget for the file chooser */
    std::string      m_fc_file_name;                /**< The file name currently selected in the file chooser */
    std::string      m_final_file_name;             /**< The name of the import file effectively to use */

    GtkWidget       *preview_page;                  /**< Assistant preview page widget */
    GtkComboBox     *settings_combo;                /**< The Settings Combo */
    GtkWidget       *save_button;                   /**< The Save Settings button */
    GtkWidget       *del_button;                    /**< The Delete Settings button */

    GtkWidget       *combo_hbox;                    /**< The Settings Combo hbox */
    GtkSpinButton   *start_row_spin;                /**< The widget for the start row spinner */
    GtkSpinButton   *end_row_spin;                  /**< The widget for the end row spinner */
    GtkWidget       *skip_alt_rows_button;          /**< The widget for Skip alternate rows from start row */
    GtkWidget       *skip_errors_button;            /**< The widget for Skip error rows*/
    GtkWidget       *csv_button;                    /**< The widget for the CSV button */
    GtkWidget       *fixed_button;                  /**< The widget for the Fixed Width button */
    GtkWidget       *over_write_cbutton;            /**< The widget for Price Overwrite */
    GtkWidget       *commodity_selector;            /**< The widget for commodity combo box */
    GtkWidget       *currency_selector;             /**< The widget for currency combo box */
    GOCharmapSel    *encselector;                   /**< The widget for selecting the encoding */
    GtkWidget       *separator_table;               /**< Container for the separator checkboxes */
    GtkCheckButton  *sep_button[SEP_NUM_OF_TYPES];  /**< Checkbuttons for common separators */
    GtkWidget       *fw_instructions_hbox;          /**< Container for fixed-width instructions */
    GtkCheckButton  *custom_cbutton;                /**< The checkbutton for a custom separator */
    GtkEntry        *custom_entry;                  /**< The entry for custom separators */
    GtkComboBoxText *date_format_combo;             /**< The Combo Text widget for selecting the date format */
    GtkComboBoxText *currency_format_combo;         /**< The Combo Text widget for selecting the currency format */
    GtkTreeView     *treeview;                      /**< The treeview containing the data */
    GtkLabel        *instructions_label;            /**< The instructions label */
    GtkImage        *instructions_image;            /**< The instructions image */
    bool             encoding_selected_called;      /**< Before encoding_selected is first called, this is false.
                                                       * error lines, instead of all the file data. */
    int              fixed_context_col;             /**< The number of the column the user has clicked */
    int              fixed_context_offset;          /**< The offset (in characters) in the column
                                                       * the user has clicked */

    GtkWidget       *confirm_page;                  /**< Assistant confirm page widget */

    GtkWidget       *summary_page;                  /**< Assistant summary page widget */
    GtkWidget       *summary_label;                 /**< The summary text */

    std::unique_ptr<GncPriceImport> price_imp;      /**< The actual data we are previewing */
};


/*******************************************************
 * Assistant call back functions
 *******************************************************/

extern "C"
{
void csv_price_imp_assist_prepare_cb (GtkAssistant  *assistant, GtkWidget *page, CsvImpPriceAssist* info);
void csv_price_imp_assist_close_cb (GtkAssistant *gtkassistant, CsvImpPriceAssist* info);
void csv_price_imp_assist_finish_cb (GtkAssistant *gtkassistant, CsvImpPriceAssist* info);
void csv_price_imp_file_activated_changed_cb (GtkFileChooser *chooser, CsvImpPriceAssist *info);
void csv_price_imp_file_selection_changed_cb (GtkFileChooser *chooser, CsvImpPriceAssist *info);
void csv_price_imp_preview_del_settings_cb (GtkWidget *button, CsvImpPriceAssist *info);
void csv_price_imp_preview_save_settings_cb (GtkWidget *button, CsvImpPriceAssist *info);
void csv_price_imp_preview_settings_sel_changed_cb (GtkComboBox *combo, CsvImpPriceAssist *info);
void csv_price_imp_preview_settings_text_inserted_cb (GtkEditable *entry, gchar *new_text,
        gint new_text_length, gint *position, CsvImpPriceAssist *info);
void csv_price_imp_preview_settings_text_changed_cb (GtkEntry *entry, CsvImpPriceAssist *info);
void csv_price_imp_preview_srow_cb (GtkSpinButton *spin, CsvImpPriceAssist *info);
void csv_price_imp_preview_erow_cb (GtkSpinButton *spin, CsvImpPriceAssist *info);
void csv_price_imp_preview_skiprows_cb (GtkToggleButton *checkbox, CsvImpPriceAssist *info);
void csv_price_imp_preview_skiperrors_cb (GtkToggleButton *checkbox, CsvImpPriceAssist *info);
void csv_price_imp_preview_overwrite_cb (GtkToggleButton *checkbox, CsvImpPriceAssist *info);
void csv_price_imp_preview_sep_button_cb (GtkWidget* widget, CsvImpPriceAssist* info);
void csv_price_imp_preview_sep_fixed_sel_cb (GtkToggleButton* csv_button, CsvImpPriceAssist* info);
void csv_price_imp_preview_acct_sel_cb (GtkWidget* widget, CsvImpPriceAssist* info);
void csv_price_imp_preview_enc_sel_cb (GOCharmapSel* selector, const char* encoding,
                              CsvImpPriceAssist* info);
}

void
csv_price_imp_assist_prepare_cb (GtkAssistant *assistant, GtkWidget *page,
        CsvImpPriceAssist* info)
{
    info->assist_prepare_cb(page);
}

void
csv_price_imp_assist_close_cb (GtkAssistant *assistant, CsvImpPriceAssist* info)
{
    gnc_close_gui_component_by_data (ASSISTANT_CSV_IMPORT_PRICE_CM_CLASS, info);
}

void
csv_price_imp_assist_finish_cb (GtkAssistant *assistant, CsvImpPriceAssist* info)
{
    info->assist_finish ();
}

void csv_price_imp_file_activated_changed_cb (GtkFileChooser *chooser, CsvImpPriceAssist *info)
{
    info->file_activated_cb();
}

void csv_price_imp_file_selection_changed_cb (GtkFileChooser *chooser, CsvImpPriceAssist *info)
{
    info->file_selection_changed_cb();
}

void csv_price_imp_preview_del_settings_cb (GtkWidget *button, CsvImpPriceAssist *info)
{
    info->preview_settings_delete();
}

void csv_price_imp_preview_save_settings_cb (GtkWidget *button, CsvImpPriceAssist *info)
{
    info->preview_settings_save();
}

void csv_price_imp_preview_settings_sel_changed_cb (GtkComboBox *combo, CsvImpPriceAssist *info)
{
    info->preview_settings_load();
}

void
csv_price_imp_preview_settings_text_inserted_cb (GtkEditable *entry, gchar *new_text,
        gint new_text_length, gint *position, CsvImpPriceAssist *info)
{
    if (!new_text)
        return;

    /* Prevent entering [], which are invalid characters in key files */
    auto base_txt = std::string (new_text);
    auto mod_txt = base_txt;
    std::replace (mod_txt.begin(), mod_txt.end(), '[', '(');
    std::replace (mod_txt.begin(), mod_txt.end(), ']', ')');
    if (base_txt == mod_txt)
        return;
    g_signal_handlers_block_by_func (entry, (gpointer) csv_price_imp_preview_settings_text_inserted_cb, info);
    gtk_editable_insert_text (entry, mod_txt.c_str(), mod_txt.size() , position);
    g_signal_handlers_unblock_by_func (entry, (gpointer) csv_price_imp_preview_settings_text_inserted_cb, info);

    g_signal_stop_emission_by_name (entry, "insert_text");
}

void
csv_price_imp_preview_settings_text_changed_cb (GtkEntry *entry, CsvImpPriceAssist *info)
{
    info->preview_settings_name(entry);
}

void csv_price_imp_preview_srow_cb (GtkSpinButton *spin, CsvImpPriceAssist *info)
{
    info->preview_update_skipped_rows();
}

void csv_price_imp_preview_erow_cb (GtkSpinButton *spin, CsvImpPriceAssist *info)
{
    info->preview_update_skipped_rows();
}

void csv_price_imp_preview_skiprows_cb (GtkToggleButton *checkbox, CsvImpPriceAssist *info)
{
    info->preview_update_skipped_rows();
}

void csv_price_imp_preview_skiperrors_cb (GtkToggleButton *checkbox, CsvImpPriceAssist *info)
{
    info->preview_update_skipped_rows();
}

void csv_price_imp_preview_overwrite_cb (GtkToggleButton *checkbox, CsvImpPriceAssist *info)
{
    info->preview_over_write (gtk_toggle_button_get_active (checkbox));
}

void csv_price_imp_preview_sep_button_cb (GtkWidget* widget, CsvImpPriceAssist* info)
{
    info->preview_update_separators(widget);
}

void csv_price_imp_preview_sep_fixed_sel_cb (GtkToggleButton* csv_button, CsvImpPriceAssist* info)
{
    info->preview_update_file_format();
}

void csv_price_imp_preview_enc_sel_cb (GOCharmapSel* selector, const char* encoding,
                              CsvImpPriceAssist* info)
{
    info->preview_update_encoding(encoding);
}

static void csv_price_imp_preview_date_fmt_sel_cb (GtkComboBox* format_selector, CsvImpPriceAssist* info)
{
    info->preview_update_date_format();
}

static void csv_price_imp_preview_currency_fmt_sel_cb (GtkComboBox* format_selector, CsvImpPriceAssist* info)
{
    info->preview_update_currency_format();
}

enum GncCommColumn {DISPLAYED_COMM, SORT_COMM, COMM_PTR, SEP};

static void csv_price_imp_preview_currency_sel_cb (GtkComboBox* currency_selector, CsvImpPriceAssist* info)
{
    info->preview_update_currency();
}

static gboolean separator_row_func (GtkTreeModel *smodel, GtkTreeIter *siter, gpointer data)
{
    gboolean      sep_row;
    GtkTreeModel *store;
    GtkTreeIter   iter;

    store = gtk_tree_model_sort_get_model (GTK_TREE_MODEL_SORT(smodel));

    gtk_tree_model_sort_convert_iter_to_child_iter (GTK_TREE_MODEL_SORT(smodel),
                                                    &iter, siter);

    gtk_tree_model_get (GTK_TREE_MODEL(store), &iter, SEP, &sep_row, -1);

    return sep_row;
}

static void csv_price_imp_preview_commodity_sel_cb (GtkComboBox* commodity_selector, CsvImpPriceAssist* info)
{
    info->preview_update_commodity();
}

static void csv_price_imp_preview_col_type_changed_cb (GtkComboBox* cbox, CsvImpPriceAssist* info)
{
    info->preview_update_col_type (cbox);
}

static gboolean
csv_price_imp_preview_treeview_clicked_cb (GtkTreeView* treeview, GdkEventButton* event,
                                        CsvImpPriceAssist* info)
{
    info->preview_update_fw_columns(treeview, event);
    return false;
}

static
gnc_commodity *get_commodity_from_combo (GtkComboBox *combo)
{
    GtkTreeModel *model, *sort_model;
    GtkTreeIter  iter, siter;
    gchar *string;
    gnc_commodity *comm;

    if (!gtk_combo_box_get_active_iter (combo, &siter))
        return nullptr;

    sort_model = gtk_combo_box_get_model (combo);
    model = gtk_tree_model_sort_get_model (GTK_TREE_MODEL_SORT(sort_model));

    gtk_tree_model_sort_convert_iter_to_child_iter (GTK_TREE_MODEL_SORT(sort_model),
                                                    &iter, &siter);

    gtk_tree_model_get (GTK_TREE_MODEL(model), &iter,
                        DISPLAYED_COMM, &string, COMM_PTR, &comm, -1);

    PINFO("Commodity string is %s", string);

    g_free (string);
    return comm;
}

static void
set_commodity_for_combo (GtkComboBox *combo, gnc_commodity *comm)
{
    GtkTreeModel *model, *sort_model;
    GtkTreeIter  iter, siter;
    gnc_commodity *model_comm;
    gboolean valid;

    sort_model = gtk_combo_box_get_model (combo);
    model = gtk_tree_model_sort_get_model (GTK_TREE_MODEL_SORT(sort_model));
    valid = gtk_tree_model_get_iter_first (model, &iter);

    while (valid)
    {
        gtk_tree_model_get (model, &iter, COMM_PTR, &model_comm, -1);
        if (model_comm == comm)
        {
            if (gtk_tree_model_sort_convert_child_iter_to_iter (GTK_TREE_MODEL_SORT(sort_model), &siter, &iter))
            {
                gtk_combo_box_set_active_iter (combo, &siter);
                return;
            }
        }
        /* Make iter point to the next row in the list store */
        valid = gtk_tree_model_iter_next (model, &iter);
    }
    // Not found, set it to first iter
    gtk_tree_model_get_iter_first (model, &iter);
    if (gtk_tree_model_sort_convert_child_iter_to_iter (GTK_TREE_MODEL_SORT(sort_model), &siter, &iter))
        gtk_combo_box_set_active_iter (combo, &siter);
}

static
GtkTreeModel *get_model (bool all_commodity)
{
    GtkTreeModel *store, *model;
    const gnc_commodity_table *commodity_table = gnc_get_current_commodities ();
    gnc_commodity *tmp_commodity = nullptr;
    char  *tmp_namespace = nullptr;
    GList *commodity_list = nullptr;
    GList *namespace_list = gnc_commodity_table_get_namespaces (commodity_table);
    GtkTreeIter iter;

    store = GTK_TREE_MODEL(gtk_list_store_new (4, G_TYPE_STRING, G_TYPE_STRING,
                                                  G_TYPE_POINTER, G_TYPE_BOOLEAN));
    model = gtk_tree_model_sort_new_with_model (store);
    // set sort order
    gtk_tree_sortable_set_sort_column_id (GTK_TREE_SORTABLE(model), SORT_COMM, GTK_SORT_ASCENDING);

    gtk_list_store_append (GTK_LIST_STORE(store), &iter);
    gtk_list_store_set (GTK_LIST_STORE(store), &iter,
                            DISPLAYED_COMM, " ", SORT_COMM, " ", COMM_PTR, nullptr, SEP, false, -1);

    namespace_list = g_list_first (namespace_list);
    while (namespace_list != nullptr)
    {
        tmp_namespace = (char*)namespace_list->data;
        DEBUG("Looking at namespace %s", tmp_namespace);

        /* Hide the template entry */
        if (g_utf8_collate (tmp_namespace, "template" ) != 0)
        {
            if ((g_utf8_collate (tmp_namespace, GNC_COMMODITY_NS_CURRENCY ) == 0) || (all_commodity == true))
            {
                commodity_list = gnc_commodity_table_get_commodities (commodity_table, tmp_namespace);
                commodity_list  = g_list_first (commodity_list);

                // if this is the CURRENCY, add a row to be identified as a separator row
                if ((g_utf8_collate (tmp_namespace, GNC_COMMODITY_NS_CURRENCY) == 0) && (all_commodity == true))
                {
                    gtk_list_store_append (GTK_LIST_STORE(store), &iter);
                    gtk_list_store_set (GTK_LIST_STORE(store), &iter, DISPLAYED_COMM, " ",
                                           SORT_COMM, "CURRENCY-", COMM_PTR, nullptr, SEP, true, -1);
                }

                while (commodity_list != nullptr)
                {
                    const gchar *name_str;
                    gchar *sort_str;
                    tmp_commodity = (gnc_commodity*)commodity_list->data;
                    DEBUG("Looking at commodity %s", gnc_commodity_get_fullname (tmp_commodity));

                    name_str = gnc_commodity_get_printname (tmp_commodity);

                    if (g_utf8_collate (tmp_namespace, GNC_COMMODITY_NS_CURRENCY) == 0)
                        sort_str = g_strconcat ("CURRENCY-", name_str, nullptr);
                    else
                        sort_str = g_strconcat ("ALL-OTHER-", name_str, nullptr);

                    DEBUG("Name string is '%s', Sort string is '%s'", name_str, sort_str);

                    gtk_list_store_append (GTK_LIST_STORE(store), &iter);
                    gtk_list_store_set (GTK_LIST_STORE(store), &iter, DISPLAYED_COMM, name_str,
                                           SORT_COMM, sort_str, COMM_PTR, tmp_commodity, SEP, false, -1);

                    g_free (sort_str);
                    commodity_list = g_list_next (commodity_list);
                }
            }
        }
        namespace_list = g_list_next (namespace_list);
    }
    g_list_free (commodity_list);
    g_list_free (namespace_list);
    g_object_unref (store);

    return model;
}


/*******************************************************
 * Assistant Constructor
 *******************************************************/
CsvImpPriceAssist::CsvImpPriceAssist ()
{
    auto builder = gtk_builder_new();
    gnc_builder_add_from_file  (builder , "assistant-csv-price-import.glade", "start_row_adj");
    gnc_builder_add_from_file  (builder , "assistant-csv-price-import.glade", "end_row_adj");
    gnc_builder_add_from_file  (builder , "assistant-csv-price-import.glade", "liststore1");
    gnc_builder_add_from_file  (builder , "assistant-csv-price-import.glade", "liststore2");
    gnc_builder_add_from_file  (builder , "assistant-csv-price-import.glade", "CSV Price Assistant");
    csv_imp_asst = GTK_ASSISTANT(gtk_builder_get_object (builder, "CSV Price Assistant"));

    // Set the name for this assistant so it can be easily manipulated with css
    gtk_widget_set_name (GTK_WIDGET(csv_imp_asst), "gnc-id-assistant-csv-price-import");
    gnc_widget_style_context_add_class (GTK_WIDGET(csv_imp_asst), "gnc-class-imports");

    /* Enable buttons on all page. */
    gtk_assistant_set_page_complete (csv_imp_asst,
                                     GTK_WIDGET(gtk_builder_get_object (builder, "start_page")),
                                     true);
    gtk_assistant_set_page_complete (csv_imp_asst,
                                     GTK_WIDGET(gtk_builder_get_object (builder, "file_page")),
                                     false);
    gtk_assistant_set_page_complete (csv_imp_asst,
                                     GTK_WIDGET(gtk_builder_get_object (builder, "preview_page")),
                                     false);
    gtk_assistant_set_page_complete (csv_imp_asst,
                                     GTK_WIDGET(gtk_builder_get_object (builder, "confirm_page")),
                                     true);
    gtk_assistant_set_page_complete (csv_imp_asst,
                                     GTK_WIDGET(gtk_builder_get_object (builder, "summary_page")),
                                     true);

    /* File chooser Page */
    file_page = GTK_WIDGET(gtk_builder_get_object (builder, "file_page"));
    file_chooser = gtk_file_chooser_widget_new (GTK_FILE_CHOOSER_ACTION_OPEN);

    g_signal_connect (G_OBJECT(file_chooser), "selection-changed",
                      G_CALLBACK(csv_price_imp_file_selection_changed_cb), this);
    g_signal_connect (G_OBJECT(file_chooser), "file-activated",
                      G_CALLBACK(csv_price_imp_file_activated_changed_cb), this);

    auto box = GTK_WIDGET(gtk_builder_get_object (builder, "file_page"));
    gtk_box_pack_start (GTK_BOX(box), file_chooser, TRUE, TRUE, 6);
    gtk_widget_show (file_chooser);

    /* Preview Settings Page */
    {
        preview_page = GTK_WIDGET(gtk_builder_get_object (builder, "preview_page"));

        // Add Settings combo
        auto settings_store = gtk_list_store_new (2, G_TYPE_POINTER, G_TYPE_STRING);
        settings_combo = GTK_COMBO_BOX(gtk_combo_box_new_with_model_and_entry (GTK_TREE_MODEL(settings_store)));
        g_object_unref (settings_store);

        gtk_combo_box_set_entry_text_column (GTK_COMBO_BOX(settings_combo), SET_NAME);
        gtk_combo_box_set_active (GTK_COMBO_BOX(settings_combo), 0);

        combo_hbox = GTK_WIDGET(gtk_builder_get_object (builder, "combo_hbox"));
        gtk_box_pack_start (GTK_BOX(combo_hbox), GTK_WIDGET(settings_combo), true, true, 6);
        gtk_widget_show (GTK_WIDGET(settings_combo));

        g_signal_connect (G_OBJECT(settings_combo), "changed",
                         G_CALLBACK(csv_price_imp_preview_settings_sel_changed_cb), this);

        // Additionally connect to the changed signal of the embedded GtkEntry
        auto emb_entry = gtk_bin_get_child (GTK_BIN (settings_combo));
        g_signal_connect (G_OBJECT(emb_entry), "changed",
                         G_CALLBACK(csv_price_imp_preview_settings_text_changed_cb), this);
        g_signal_connect (G_OBJECT(emb_entry), "insert-text",
                         G_CALLBACK(csv_price_imp_preview_settings_text_inserted_cb), this);

        // Add Save Settings button
        save_button = GTK_WIDGET(gtk_builder_get_object (builder, "save_settings"));

        // Add Delete Settings button
        del_button = GTK_WIDGET(gtk_builder_get_object (builder, "delete_settings"));

        /* The table containing the separator configuration widgets */
        start_row_spin = GTK_SPIN_BUTTON(gtk_builder_get_object (builder, "start_row"));
        end_row_spin = GTK_SPIN_BUTTON(gtk_builder_get_object (builder, "end_row"));
        skip_alt_rows_button = GTK_WIDGET(gtk_builder_get_object (builder, "skip_rows"));
        skip_errors_button = GTK_WIDGET(gtk_builder_get_object (builder, "skip_errors_button"));
        over_write_cbutton = GTK_WIDGET(gtk_builder_get_object (builder, "over_write_button"));
        separator_table = GTK_WIDGET(gtk_builder_get_object (builder, "separator_table"));
        fw_instructions_hbox = GTK_WIDGET(gtk_builder_get_object (builder, "fw_instructions_hbox"));

        /* Load the separator buttons from the glade builder file into the
         * sep_buttons array. */
        const char* sep_button_names[] = {
                "space_cbutton",
                "tab_cbutton",
                "comma_cbutton",
                "colon_cbutton",
                "semicolon_cbutton",
                "hyphen_cbutton"
            };
        for (int i = 0; i < SEP_NUM_OF_TYPES; i++)
            sep_button[i]
                = (GtkCheckButton*)GTK_WIDGET(gtk_builder_get_object (builder, sep_button_names[i]));

        /* Load and connect the custom separator checkbutton in the same way
         * as the other separator buttons. */
        custom_cbutton
            = (GtkCheckButton*)GTK_WIDGET(gtk_builder_get_object (builder, "custom_cbutton"));

        /* Load the entry for the custom separator entry. Connect it to the
         * sep_button_clicked event handler as well. */
        custom_entry = (GtkEntry*)GTK_WIDGET(gtk_builder_get_object (builder, "custom_entry"));

        /* Create the encoding selector widget and add it to the assistant */
        encselector = GO_CHARMAP_SEL(go_charmap_sel_new(GO_CHARMAP_SEL_TO_UTF8));
        /* Connect the selector to the encoding_selected event handler. */
        g_signal_connect (G_OBJECT(encselector), "charmap_changed",
                         G_CALLBACK(csv_price_imp_preview_enc_sel_cb), this);

        auto encoding_container = GTK_CONTAINER(gtk_builder_get_object (builder, "encoding_container"));
        gtk_container_add (encoding_container, GTK_WIDGET(encselector));
        gtk_widget_set_hexpand (GTK_WIDGET(encselector), true);
        gtk_widget_show_all (GTK_WIDGET(encoding_container));

        /* Add commodity selection widget */
        commodity_selector = GTK_WIDGET(gtk_builder_get_object (builder, "commodity_cbox"));
        gtk_combo_box_set_model (GTK_COMBO_BOX(commodity_selector), get_model (true));
        gtk_combo_box_set_row_separator_func (GTK_COMBO_BOX(commodity_selector),
                                              separator_row_func, nullptr, nullptr);
        g_signal_connect (G_OBJECT(commodity_selector), "changed",
                          G_CALLBACK(csv_price_imp_preview_commodity_sel_cb), this);

        /* Add currency selection widget */
        currency_selector = GTK_WIDGET(gtk_builder_get_object (builder, "currency_cbox"));
        gtk_combo_box_set_model (GTK_COMBO_BOX(currency_selector), get_model (false));
        g_signal_connect(G_OBJECT(currency_selector), "changed",
                         G_CALLBACK(csv_price_imp_preview_currency_sel_cb), this);

        /* The instructions label and image */
        instructions_label = GTK_LABEL(gtk_builder_get_object (builder, "instructions_label"));
        instructions_image = GTK_IMAGE(gtk_builder_get_object (builder, "instructions_image"));

        /* Add in the date format combo box and hook it up to an event handler. */
        date_format_combo = GTK_COMBO_BOX_TEXT(gtk_combo_box_text_new());
        for (auto& date_fmt : GncDate::c_formats)
            gtk_combo_box_text_append_text (date_format_combo, _(date_fmt.m_fmt.c_str()));
        gtk_combo_box_set_active (GTK_COMBO_BOX(date_format_combo), 0);
        g_signal_connect (G_OBJECT(date_format_combo), "changed",
                         G_CALLBACK(csv_price_imp_preview_date_fmt_sel_cb), this);

        /* Add it to the assistant. */
        auto date_format_container = GTK_CONTAINER(gtk_builder_get_object (builder, "date_format_container"));
        gtk_container_add (date_format_container, GTK_WIDGET(date_format_combo));
        gtk_widget_set_hexpand (GTK_WIDGET(date_format_combo), true);
        gtk_widget_show_all (GTK_WIDGET(date_format_container));

        /* Add in the currency format combo box and hook it up to an event handler. */
        currency_format_combo = GTK_COMBO_BOX_TEXT(gtk_combo_box_text_new());
        for (int i = 0; i < num_currency_formats_price; i++)
        {
            gtk_combo_box_text_append_text (currency_format_combo, _(currency_format_user_price[i]));
        }
        /* Default will the locale */
        gtk_combo_box_set_active (GTK_COMBO_BOX(currency_format_combo), 0);
        g_signal_connect (G_OBJECT(currency_format_combo), "changed",
                         G_CALLBACK(csv_price_imp_preview_currency_fmt_sel_cb), this);

        /* Add it to the assistant. */
        auto currency_format_container = GTK_CONTAINER(gtk_builder_get_object (builder, "currency_format_container"));
        gtk_container_add (currency_format_container, GTK_WIDGET(currency_format_combo));
        gtk_widget_set_hexpand (GTK_WIDGET(currency_format_combo), true);
        gtk_widget_show_all (GTK_WIDGET(currency_format_container));

        /* Connect the CSV/Fixed-Width radio button event handler. */
        csv_button = GTK_WIDGET(gtk_builder_get_object (builder, "csv_button"));
        fixed_button = GTK_WIDGET(gtk_builder_get_object (builder, "fixed_button"));

        /* Load the data treeview and connect it to its resizing event handler. */
        treeview = (GtkTreeView*)GTK_WIDGET(gtk_builder_get_object (builder, "treeview"));
        gtk_tree_view_set_headers_clickable (treeview, true);

        /* This is true only after encoding_selected is called, so we must
         * set it initially to false. */
        encoding_selected_called = false;
    }

    /* Confirm Page */
    confirm_page = GTK_WIDGET(gtk_builder_get_object (builder, "confirm_page"));

    /* Summary Page */
    summary_page  = GTK_WIDGET(gtk_builder_get_object (builder, "summary_page"));
    summary_label = GTK_WIDGET(gtk_builder_get_object (builder, "summary_label"));

    gnc_restore_window_size (GNC_PREFS_GROUP,
                             GTK_WINDOW(csv_imp_asst), gnc_ui_get_main_window(nullptr));

    gtk_builder_connect_signals (builder, this);
    g_object_unref (G_OBJECT(builder));

    gtk_widget_show_all (GTK_WIDGET(csv_imp_asst));
    gnc_window_adjust_for_screen (GTK_WINDOW(csv_imp_asst));
}

/*******************************************************
 * Assistant Destructor
 *******************************************************/
CsvImpPriceAssist::~CsvImpPriceAssist ()
{
    gtk_widget_destroy (GTK_WIDGET(csv_imp_asst));
}

/**************************************************
 * Code related to the file chooser page
 **************************************************/

/* check_for_valid_filename for a valid file to activate the "Next" button
 */
bool
CsvImpPriceAssist::check_for_valid_filename ()
{
    auto file_name = gtk_file_chooser_get_filename (GTK_FILE_CHOOSER(file_chooser));
    if (!file_name || g_file_test (file_name, G_FILE_TEST_IS_DIR))
    {
        g_free (file_name);
        return false;
    }

    auto filepath = gnc_uri_get_path (file_name);
    auto starting_dir = g_path_get_dirname (filepath);

    m_fc_file_name = file_name;
    gnc_set_default_directory (GNC_PREFS_GROUP, starting_dir);

    DEBUG("file_name selected is %s", m_fc_file_name.c_str());
    DEBUG("starting directory is %s", starting_dir);

    g_free (filepath);
    g_free (file_name);
    g_free (starting_dir);

    return true;
}

/* csv_price_imp_file_activated_cb
 *
 * call back for file chooser widget
 */
void
CsvImpPriceAssist::file_activated_cb ()
{
    gtk_assistant_set_page_complete (csv_imp_asst, file_page, false);

    /* Test for a valid filename and not a directory */
    if (check_for_valid_filename ())
    {
        gtk_assistant_set_page_complete (csv_imp_asst, file_page, true);
        gtk_assistant_next_page (csv_imp_asst);
    }
}

/* csv_price_imp_file_selection_changed_cb
 *
 * call back for file chooser widget
 */
void
CsvImpPriceAssist::file_selection_changed_cb ()
{
    /* Enable the "Next" button based on a valid filename */
    gtk_assistant_set_page_complete (csv_imp_asst, file_page,
        check_for_valid_filename ());
}


/**************************************************
 * Code related to the preview page
 **************************************************/

/* Set the available presets in the settings combo box
 */
void CsvImpPriceAssist::preview_populate_settings_combo()
{
    // Clear the list store
    auto model = gtk_combo_box_get_model (settings_combo);
    gtk_list_store_clear (GTK_LIST_STORE(model));

    // Append the default entry
    auto presets = get_import_presets_price ();
    for (const auto& preset : presets)
    {
        GtkTreeIter iter;
        gtk_list_store_append (GTK_LIST_STORE(model), &iter);
        /* FIXME we store the raw pointer to the preset, while it's
         * managed by a shared pointer. This is dangerous because
         * when the shared pointer goes out of scope, our pointer will dangle.
         * For now this is safe, because the shared pointers in this case are
         * long-lived, but this may need refactoring.
         */
        gtk_list_store_set (GTK_LIST_STORE(model), &iter, SET_GROUP, preset.get(), SET_NAME, _(preset->m_name.c_str()), -1);
    }
}

/* Enable or disable the save and delete settings buttons
 * depending on what is selected and entered as settings name
 */
void CsvImpPriceAssist::preview_handle_save_del_sensitivity (GtkComboBox* combo)
{
    GtkTreeIter iter;
    auto can_delete = false;
    auto can_save = false;
    auto entry = gtk_bin_get_child (GTK_BIN(combo));
    auto entry_text = gtk_entry_get_text (GTK_ENTRY(entry));
    /* Handle sensitivity of the delete and save button */
    if (gtk_combo_box_get_active_iter (combo, &iter))
    {
        CsvPriceImpSettings *preset;
        GtkTreeModel *model = gtk_combo_box_get_model (combo);
        gtk_tree_model_get (model, &iter, SET_GROUP, &preset, -1);

        if (preset && !preset_is_reserved_name (preset->m_name))
        {
            /* Current preset is not read_only, so buttons can be enabled */
            can_delete = true;
            can_save = true;
        }
    }
    else if (entry_text && (strlen (entry_text) > 0) &&
            !preset_is_reserved_name (std::string(entry_text)))
        can_save = true;

    gtk_widget_set_sensitive (save_button, can_save);
    gtk_widget_set_sensitive (del_button, can_delete);
}

void
CsvImpPriceAssist::preview_settings_name (GtkEntry* entry)
{
    auto text = gtk_entry_get_text (entry);
    if (text)
        price_imp->settings_name(text);

    auto box = gtk_widget_get_parent (GTK_WIDGET(entry));
    auto combo = gtk_widget_get_parent (GTK_WIDGET(box));

    preview_handle_save_del_sensitivity (GTK_COMBO_BOX(combo));
}

/* Use selected preset to configure the import. Triggered when
 * a preset is selected in the settings combo.
 */
void
CsvImpPriceAssist::preview_settings_load ()
{
    // Get the Active Selection
    GtkTreeIter iter;
    if (!gtk_combo_box_get_active_iter (settings_combo, &iter))
        return;

    CsvPriceImpSettings *preset = nullptr;
    auto model = gtk_combo_box_get_model (settings_combo);
    gtk_tree_model_get (model, &iter, SET_GROUP, &preset, -1);

    if (!preset)
        return;

    price_imp->settings (*preset);
    if (preset->m_load_error)
        gnc_error_dialog (GTK_WINDOW(csv_imp_asst),
            "%s", _("There were problems reading some saved settings, continuing to load.\n"
                    "Please review and save again."));

    preview_refresh ();
    preview_handle_save_del_sensitivity (settings_combo);
}

/* Callback to delete a settings entry
 */
void
CsvImpPriceAssist::preview_settings_delete ()
{
    // Get the Active Selection
    GtkTreeIter iter;
    if (!gtk_combo_box_get_active_iter (settings_combo, &iter))
        return;

    CsvPriceImpSettings *preset = nullptr;
    auto model = gtk_combo_box_get_model (settings_combo);
    gtk_tree_model_get (model, &iter, SET_GROUP, &preset, -1);

    auto response = gnc_ok_cancel_dialog (GTK_WINDOW(csv_imp_asst),
                                GTK_RESPONSE_CANCEL,
                                "%s", _("Delete the Import Settings."));
    if (response == GTK_RESPONSE_OK)
    {
        preset->remove();
        preview_populate_settings_combo();
        gtk_combo_box_set_active (settings_combo, 0); // Default
        preview_refresh (); // Reset the widgets
    }
}

/* Callback to save the current settings to the gnucash state file.
 */
void
CsvImpPriceAssist::preview_settings_save ()
{
    auto new_name = price_imp->settings_name();

    /* Check if the entry text matches an already existing preset */
    GtkTreeIter iter;
    if (!gtk_combo_box_get_active_iter (settings_combo, &iter))
    {

        auto model = gtk_combo_box_get_model (settings_combo);
        bool valid = gtk_tree_model_get_iter_first (model, &iter);
        while (valid)
        {
            // Walk through the list, reading each row
            CsvPriceImpSettings *preset;
            gtk_tree_model_get (model, &iter, SET_GROUP, &preset, -1);

            if (preset && (preset->m_name == std::string(new_name)))
            {
                auto response = gnc_ok_cancel_dialog (GTK_WINDOW(csv_imp_asst),
                        GTK_RESPONSE_OK,
                        "%s", _("Setting name already exists, overwrite?"));
                if (response != GTK_RESPONSE_OK)
                    return;

                break;
            }
            valid = gtk_tree_model_iter_next (model, &iter);
        }
    }

    /* All checks passed, let's save this preset */
    if (!price_imp->save_settings())
    {
        gnc_info_dialog (GTK_WINDOW(csv_imp_asst),
            "%s", _("The settings have been saved."));

        // Update the settings store
        preview_populate_settings_combo();
        auto model = gtk_combo_box_get_model (settings_combo);

        // Get the first entry in model
        GtkTreeIter   iter;
        bool valid = gtk_tree_model_get_iter_first (model, &iter);
        while (valid)
        {
            // Walk through the list, reading each row
            gchar *name = nullptr;
            gtk_tree_model_get (model, &iter, SET_NAME, &name, -1);

            if (g_strcmp0 (name, new_name.c_str()) == 0) // Set Active, the one Saved.
                gtk_combo_box_set_active_iter (settings_combo, &iter);

            g_free (name);

            valid = gtk_tree_model_iter_next (model, &iter);
        }
    }
    else
        gnc_error_dialog (GTK_WINDOW(csv_imp_asst),
            "%s", _("There was a problem saving the settings, please try again."));
}

/* Callback triggered when user adjusts skip start lines
 */
void CsvImpPriceAssist::preview_update_skipped_rows ()
{
    /* Update skip rows in the parser */
    price_imp->update_skipped_lines (gtk_spin_button_get_value_as_int (start_row_spin),
        gtk_spin_button_get_value_as_int (end_row_spin),
        gtk_toggle_button_get_active (GTK_TOGGLE_BUTTON(skip_alt_rows_button)),
        gtk_toggle_button_get_active (GTK_TOGGLE_BUTTON(skip_errors_button)));

    /* And adjust maximum number of lines that can be skipped at each end accordingly */
    auto adj = gtk_spin_button_get_adjustment (end_row_spin);
    gtk_adjustment_set_upper (adj, price_imp->m_parsed_lines.size()
            - price_imp->skip_start_lines() -1);

    adj = gtk_spin_button_get_adjustment (start_row_spin);
    gtk_adjustment_set_upper (adj, price_imp->m_parsed_lines.size()
            - price_imp->skip_end_lines() - 1);

    preview_refresh_table ();
}

/* Callback triggered when user clicks on Overwrite option
 */
void CsvImpPriceAssist::preview_over_write (bool over)
{
    price_imp->over_write (over);
}

/** Event handler for separator changes. This function is called
 * whenever one of the widgets for configuring the separators (the
 * separator checkbuttons or the custom separator entry) is
 * changed.
 * @param widget The widget that was changed
 * @param info The data that is being configured
 */
void CsvImpPriceAssist::preview_update_separators (GtkWidget* widget)
{
    /* Only manipulate separator characters if the currently open file is
     * csv separated. */
    if (price_imp->file_format() != GncImpFileFormat::CSV)
        return;

    /* Add the corresponding characters to checked_separators for each
     * button that is checked. */
    auto checked_separators = std::string();
    const auto stock_sep_chars = std::string (" \t,:;-");
    for (int i = 0; i < SEP_NUM_OF_TYPES; i++)
    {
        if (gtk_toggle_button_get_active (GTK_TOGGLE_BUTTON(sep_button[i])))
            checked_separators += stock_sep_chars[i];
    }

    /* Add the custom separator if the user checked its button. */
    if (gtk_toggle_button_get_active (GTK_TOGGLE_BUTTON(custom_cbutton)))
    {
        auto custom_sep = gtk_entry_get_text (custom_entry);
        if (custom_sep[0] != '\0') /* Don't add a blank separator (bad things will happen!). */
            checked_separators += custom_sep;
    }

    /* Set the parse options using the checked_separators list. */
    price_imp->separators (checked_separators);

    /* if there are no separators, there will only be one column
     * so make sure column header is NONE */
    if (checked_separators.empty())
        price_imp->set_column_type_price (0, GncPricePropType::NONE);

    /* Parse the data using the new options. We don't want to reguess
     * the column types because we want to leave the user's
     * configurations intact. */
    try
    {
        price_imp->tokenize (false);
        preview_refresh_table ();
    }
    catch (std::range_error &e)
    {
        /* Warn the user there was a problem and try to undo what caused
         * the error. (This will cause a reparsing and ideally a usable
         * configuration.) */
        gnc_error_dialog (GTK_WINDOW(csv_imp_asst), "Error in parsing");
        /* If we're here because the user changed the file format, we should just wait for the user
         * to update the configuration */
        if (!widget)
            return;
        /* If the user changed the custom separator, erase that custom separator. */
        if (widget == GTK_WIDGET(custom_entry))
            gtk_entry_set_text (GTK_ENTRY(widget), "");
        /* If the user checked a checkbutton, toggle that checkbutton back. */
        else
            gtk_toggle_button_set_active (GTK_TOGGLE_BUTTON(widget),
                                         !gtk_toggle_button_get_active (GTK_TOGGLE_BUTTON(widget)));
        return;
    }
}

/** Event handler for clicking one of the format type radio
 * buttons. This occurs if the format (Fixed-Width or CSV) is changed.
 * @param csv_button The "Separated" radio button
 * @param info The display of the data being imported
 */
void CsvImpPriceAssist::preview_update_file_format ()
{
    /* Set the parsing type correctly. */
    try
    {
        if (gtk_toggle_button_get_active (GTK_TOGGLE_BUTTON(csv_button)))
        {
            price_imp->file_format (GncImpFileFormat::CSV);
            g_signal_handlers_disconnect_by_func(G_OBJECT(treeview),
                    (gpointer)csv_price_imp_preview_treeview_clicked_cb, (gpointer)this);
            gtk_widget_set_visible (separator_table, true);
            gtk_widget_set_visible (fw_instructions_hbox, false);
        }
        else
        {
            price_imp->file_format (GncImpFileFormat::FIXED_WIDTH);
            /* Enable context menu for adding/removing columns. */
            g_signal_connect (G_OBJECT(treeview), "button-press-event",
                    G_CALLBACK(csv_price_imp_preview_treeview_clicked_cb), (gpointer)this);
            gtk_widget_set_visible (separator_table, false);
            gtk_widget_set_visible (fw_instructions_hbox, true);

        }
        price_imp->tokenize (false);
        preview_refresh_table ();
    }
    catch (std::range_error &e)
    {
        /* Parsing failed ... */
        gnc_error_dialog (GTK_WINDOW (csv_imp_asst), "%s", e.what());
        return;
    }
    catch (...)
    {
        // FIXME Handle file loading errors (possibly thrown by file_format above)
        PWARN("Got an error during file loading");
    }
}

/** Event handler for a new encoding. This is called when the user
 * selects a new encoding; the data is reparsed and shown to the
 * user.
 * @param selector The widget the user uses to select a new encoding
 * @param encoding The encoding that the user selected
 */
void
CsvImpPriceAssist::preview_update_encoding (const char* encoding)
{
    /* This gets called twice every time a new encoding is selected. The
     * second call actually passes the correct data; thus, we only do
     * something the second time this is called. */

    /* If this is the second time the function is called ... */
    if (encoding_selected_called)
    {
        std::string previous_encoding = price_imp->m_tokenizer->encoding();
        /* Try converting the new encoding and reparsing. */
        try
        {
            price_imp->encoding (encoding);
            preview_refresh_table ();
        }
        catch (...)
        {
            /* If it fails, change back to the old encoding. */
            gnc_error_dialog (GTK_WINDOW (csv_imp_asst), "%s", _("Invalid encoding selected"));
            go_charmap_sel_set_encoding (encselector, previous_encoding.c_str());
        }
    }
    encoding_selected_called = !encoding_selected_called;
}

void
CsvImpPriceAssist::preview_update_date_format ()
{
    price_imp->date_format (gtk_combo_box_get_active (GTK_COMBO_BOX(date_format_combo)));
    preview_refresh_table ();
}

void
CsvImpPriceAssist::preview_update_currency_format ()
{
    price_imp->currency_format (gtk_combo_box_get_active (GTK_COMBO_BOX(currency_format_combo)));
    preview_refresh_table ();
}

void
CsvImpPriceAssist::preview_update_currency ()
{
    gnc_commodity *comm = get_commodity_from_combo (GTK_COMBO_BOX(currency_selector));
    price_imp->to_currency (comm);
    preview_refresh_table ();
}

void
CsvImpPriceAssist::preview_update_commodity ()
{
    gnc_commodity *comm = get_commodity_from_combo (GTK_COMBO_BOX(commodity_selector));
    price_imp->from_commodity (comm);
    preview_refresh_table ();
}

static gboolean
csv_imp_preview_queue_rebuild_table (CsvImpPriceAssist *assist)
{
    assist->preview_refresh_table ();
    return false;
}

/* Internally used enum to access the columns in the comboboxes
 * the user can click to set a type for each column of the data
 */
enum PreviewHeaderComboCols { COL_TYPE_NAME, COL_TYPE_ID };
/* Internally used enum to access the first two (fixed) columns
 * in the model used to display the prased data.
 */
enum PreviewDataTableCols {
    PREV_COL_FCOLOR,
    PREV_COL_BCOLOR,
    PREV_COL_STRIKE,
    PREV_COL_ERROR,
    PREV_COL_ERR_ICON,
    PREV_N_FIXED_COLS };


void
CsvImpPriceAssist::preview_reparse_col_type (GncPricePropType type)
{
    auto column_types = price_imp->column_types_price();

    // look for column type and force a reparse
    auto col_type = std::find (column_types.begin(),
                column_types.end(), type);
    if (col_type != column_types.end())
    {
        price_imp->set_column_type_price (col_type -column_types.begin(),
                        type, true);
    }
}

/** Event handler for the user selecting a new column type. When the
 * user selects a new column type, that column's text must be changed
 * to the selection, and any other columns containing that selection
 * must be changed to "None" because we don't allow duplicates.
 * @param renderer The renderer of the column the user changed
 * @param path There is only 1 row in info->ctreeview, so this is always 0.
 * @param new_text The text the user selected
 * @param info The display of the data being imported
 */
void CsvImpPriceAssist::preview_update_col_type (GtkComboBox* cbox)
{
    /* Get the new text */
    GtkTreeIter iter;
    auto model = gtk_combo_box_get_model (cbox);
    gtk_combo_box_get_active_iter (cbox, &iter);
    auto new_col_type = GncPricePropType::NONE;
    gtk_tree_model_get (model, &iter, COL_TYPE_ID, &new_col_type, -1);

    auto col_num = GPOINTER_TO_UINT (g_object_get_data (G_OBJECT(cbox), "col-num"));

    auto column_types = price_imp->column_types_price();
    auto old_col_type = column_types.at(col_num);

    price_imp->set_column_type_price (col_num, new_col_type);

    // if old_col_type is TO_CURRENCY, force a reparse of commodity
    if (old_col_type == GncPricePropType::TO_CURRENCY)
    {
        // look for a from_commodity column to reparse
        preview_reparse_col_type (GncPricePropType::FROM_SYMBOL);
        preview_reparse_col_type (GncPricePropType::FROM_NAMESPACE);
    }

    // if old_col_type is FROM_SYMBOL, or FROM_NAMESPACE force a reparse of currency
    if ((old_col_type == GncPricePropType::FROM_SYMBOL) ||
        (old_col_type == GncPricePropType::FROM_NAMESPACE))
    {
        // look for a to_currency column to reparse
        preview_reparse_col_type (GncPricePropType::TO_CURRENCY);
    }

    /* Delay rebuilding our data table to avoid critical warnings due to
     * pending events still acting on them after this event is processed.
     */
    g_idle_add ((GSourceFunc)csv_imp_preview_queue_rebuild_table, this);
}

/*======================================================================*/
/*================== Beginning of Gnumeric Code ========================*/

/* The following is code copied from Gnumeric 1.7.8 licensed under the
 * GNU General Public License version 2 and/or version 3. It is from the file
 * gnumeric/gnucash/dialogs/dialog-stf-fixed-page.c, and it has been
 * modified slightly to work within GnuCash. */

/*
 * Copyright 2001 Almer S. Tigelaar <almer@gnome.org>
 * Copyright 2003 Morten Welinder <terra@gnome.org>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

enum
{
    CONTEXT_STF_IMPORT_MERGE_LEFT = 1,
    CONTEXT_STF_IMPORT_MERGE_RIGHT = 2,
    CONTEXT_STF_IMPORT_SPLIT = 3,
    CONTEXT_STF_IMPORT_WIDEN = 4,
    CONTEXT_STF_IMPORT_NARROW = 5
};

static GnumericPopupMenuElement const popup_elements[] =
{
    {
        N_("Merge with column on _left"), "list-remove",
        0, 1 << CONTEXT_STF_IMPORT_MERGE_LEFT, CONTEXT_STF_IMPORT_MERGE_LEFT
    },
    {
        N_("Merge with column on _right"), "list-remove",
        0, 1 << CONTEXT_STF_IMPORT_MERGE_RIGHT, CONTEXT_STF_IMPORT_MERGE_RIGHT
    },
    { "", nullptr, 0, 0, 0 },
    {
        N_("_Split this column"), nullptr,
        0, 1 << CONTEXT_STF_IMPORT_SPLIT, CONTEXT_STF_IMPORT_SPLIT
    },
    { "", nullptr, 0, 0, 0 },
    {
        N_("_Widen this column"), "go-next",
        0, 1 << CONTEXT_STF_IMPORT_WIDEN, CONTEXT_STF_IMPORT_WIDEN
    },
    {
        N_("_Narrow this column"), "go-previous",
        0, 1 << CONTEXT_STF_IMPORT_NARROW, CONTEXT_STF_IMPORT_NARROW
    },
    { nullptr, nullptr, 0, 0, 0 },
};

uint32_t CsvImpPriceAssist::get_new_col_rel_pos (GtkTreeViewColumn *tcol, int dx)
{
    auto renderers = gtk_cell_layout_get_cells (GTK_CELL_LAYOUT(tcol));
    auto cell = GTK_CELL_RENDERER(renderers->data);
    g_list_free (renderers);
    PangoFontDescription *font_desc;
    g_object_get (G_OBJECT(cell), "font_desc", &font_desc, nullptr);

    PangoLayout *layout = gtk_widget_create_pango_layout (GTK_WIDGET(treeview), "x");
    pango_layout_set_font_description (layout, font_desc);
    int width;
    pango_layout_get_pixel_size (layout, &width, nullptr);
    if (width < 1) width = 1;
    uint32_t charindex = (dx + width / 2) / width;
    g_object_unref (layout);
    pango_font_description_free (font_desc);

    return charindex;
}

gboolean
fixed_context_menu_handler_price (GnumericPopupMenuElement const *element,
        gpointer userdata)
{
    auto info = (CsvImpPriceAssist*)userdata;
    auto fwtok = dynamic_cast<GncFwTokenizer*>(info->price_imp->m_tokenizer.get());

    switch (element->index)
    {
    case CONTEXT_STF_IMPORT_MERGE_LEFT:
        fwtok->col_delete (info->fixed_context_col - 1);
        break;
    case CONTEXT_STF_IMPORT_MERGE_RIGHT:
        fwtok->col_delete (info->fixed_context_col);
        break;
    case CONTEXT_STF_IMPORT_SPLIT:
        fwtok->col_split (info->fixed_context_col, info->fixed_context_offset);
        break;
    case CONTEXT_STF_IMPORT_WIDEN:
        fwtok->col_widen (info->fixed_context_col);
        break;
    case CONTEXT_STF_IMPORT_NARROW:
        fwtok->col_narrow (info->fixed_context_col);
        break;
    default:
        ; /* Nothing */
    }

    try
    {
        info->price_imp->tokenize (false);
    }
    catch(std::range_error& e)
    {
        gnc_error_dialog (GTK_WINDOW (info->csv_imp_asst), "%s", e.what());
        return false;
    }
    info->preview_refresh_table ();
    return true;
}

void
CsvImpPriceAssist::fixed_context_menu (GdkEventButton *event,
                    int col, int offset)
{
    auto fwtok = dynamic_cast<GncFwTokenizer*>(price_imp->m_tokenizer.get());
    fixed_context_col = col;
    fixed_context_offset = offset;

    int sensitivity_filter = 0;
    if (!fwtok->col_can_delete (col - 1))
        sensitivity_filter |= (1 << CONTEXT_STF_IMPORT_MERGE_LEFT);
    if (!fwtok->col_can_delete (col))
        sensitivity_filter |= (1 << CONTEXT_STF_IMPORT_MERGE_RIGHT);
    if (!fwtok->col_can_split (col, offset))
        sensitivity_filter |= (1 << CONTEXT_STF_IMPORT_SPLIT);
    if (!fwtok->col_can_widen (col))
        sensitivity_filter |= (1 << CONTEXT_STF_IMPORT_WIDEN);
    if (!fwtok->col_can_narrow (col))
        sensitivity_filter |= (1 << CONTEXT_STF_IMPORT_NARROW);

    gnumeric_create_popup_menu (popup_elements, &fixed_context_menu_handler_price,
                                this, 0,
                                sensitivity_filter, event);
}

/*===================== End of Gnumeric Code ===========================*/
/*======================================================================*/
void
CsvImpPriceAssist::preview_split_column (int col, int offset)
{
    auto fwtok = dynamic_cast<GncFwTokenizer*>(price_imp->m_tokenizer.get());
    fwtok->col_split (col, offset);
    try
    {
        price_imp->tokenize (false);
    }
    catch (std::range_error& e)
    {
        gnc_error_dialog (GTK_WINDOW (csv_imp_asst), "%s", e.what());
        return;
    }
    preview_refresh_table();
}

/** Event handler for clicking on column headers. This function is
 * called whenever the user clicks on column headers in
 * preview->treeview to modify columns when in fixed-width mode.
 * @param button The button at the top of a column of the treeview
 * @param event The event that happened (where the user clicked)
 * @param info The data being configured
 * @returns true if further processing of this even should stop, false
 *               if other event handlers can have a go at this as well
 */
void
CsvImpPriceAssist::preview_update_fw_columns (GtkTreeView* treeview, GdkEventButton* event)
{
    /* Nothing to do if this was not triggered on our treeview body */
    if (event->window != gtk_tree_view_get_bin_window (treeview))
        return;

    /* Find the column that was clicked. */
    GtkTreeViewColumn *tcol = nullptr;
    int cell_x = 0;
    auto success = gtk_tree_view_get_path_at_pos (treeview,
            (int)event->x, (int)event->y,
            nullptr, &tcol, &cell_x, nullptr);
    if (!success)
        return;

    /* Stop if no column found in this treeview (-1) or
     * if column is the error messages column (0) */
    auto tcol_list = gtk_tree_view_get_columns(treeview);
    auto tcol_num = g_list_index (tcol_list, tcol);
    g_list_free (tcol_list);
    if (tcol_num <= 0)
        return;

    /* Data columns in the treeview are offset by one
     * because the first column is the error column
     */
    auto dcol = tcol_num - 1;
    auto offset = get_new_col_rel_pos (tcol, cell_x);
    if (event->type == GDK_2BUTTON_PRESS && event->button == 1)
        /* Double clicks can split columns. */
        preview_split_column (dcol, offset);
    else if (event->type == GDK_BUTTON_PRESS && event->button == 3)
        /* Right clicking brings up a context menu. */
        fixed_context_menu (event, dcol, offset);
}

/* Convert state info (errors/skipped) in visual feedback to decorate the preview table */
void
CsvImpPriceAssist::preview_row_fill_state_cells (GtkListStore *store, GtkTreeIter *iter,
        std::string& err_msg, bool skip)
{
    /* Extract error status for all non-skipped lines */
    const char *c_err_msg = nullptr;
    const char *icon_name = nullptr;
    const char *fcolor = nullptr;
    const char *bcolor = nullptr;
    if (!skip && !err_msg.empty())
    {
        fcolor = "black";
        bcolor = "pink";
        c_err_msg = err_msg.c_str();
        icon_name = "dialog-error";
    }
    gtk_list_store_set (store, iter,
            PREV_COL_FCOLOR, fcolor,
            PREV_COL_BCOLOR, bcolor,
            PREV_COL_STRIKE, skip,
            PREV_COL_ERROR, c_err_msg,
            PREV_COL_ERR_ICON, icon_name, -1);
}

/* Helper function that creates a combo_box using a model
 * with valid column types and selects the given column type
 */
GtkWidget*
CsvImpPriceAssist::preview_cbox_factory (GtkTreeModel* model, uint32_t colnum)
{
    GtkTreeIter iter;
    auto cbox = gtk_combo_box_new_with_model(model);

    /* Set up a renderer for this combobox. */
    auto renderer = gtk_cell_renderer_text_new();
    gtk_cell_layout_pack_start (GTK_CELL_LAYOUT(cbox),
            renderer, true);
    gtk_cell_layout_add_attribute (GTK_CELL_LAYOUT(cbox),
            renderer, "text", COL_TYPE_NAME);

    auto valid = gtk_tree_model_get_iter_first (model, &iter);
    while (valid)
    {
        gint stored_col_type;
        gtk_tree_model_get (model, &iter,
                COL_TYPE_ID, &stored_col_type, -1);
        if (stored_col_type == static_cast<int>( price_imp->column_types_price()[colnum]))
            break;
        valid = gtk_tree_model_iter_next(model, &iter);
    }
    if (valid)
        gtk_combo_box_set_active_iter (GTK_COMBO_BOX(cbox), &iter);

    g_object_set_data (G_OBJECT(cbox), "col-num", GUINT_TO_POINTER(colnum));
    g_signal_connect (G_OBJECT(cbox), "changed",
                     G_CALLBACK(csv_price_imp_preview_col_type_changed_cb), (gpointer)this);

    gtk_widget_show (cbox);
    return cbox;
}

void
CsvImpPriceAssist::preview_style_column (uint32_t col_num, GtkTreeModel* model)
{
    auto col = gtk_tree_view_get_column (treeview, col_num);
    auto renderer = static_cast<GtkCellRenderer*>(gtk_cell_layout_get_cells(GTK_CELL_LAYOUT(col))->data);

    /* First column -the error status column- is rendered differently */
    if (col_num == 0)
    {
        gtk_tree_view_column_set_attributes (col, renderer,
                "icon-name", PREV_COL_ERR_ICON,
                "cell-background", PREV_COL_BCOLOR, nullptr);
        g_object_set (G_OBJECT(renderer), "stock-size", GTK_ICON_SIZE_MENU, nullptr);
        g_object_set (G_OBJECT(col), "sizing", GTK_TREE_VIEW_COLUMN_FIXED,
                "fixed-width", 20, nullptr);
        gtk_tree_view_column_set_resizable (col, false);
    }
    else
    {
        gtk_tree_view_column_set_attributes (col, renderer,
                "foreground", PREV_COL_FCOLOR,
                "background", PREV_COL_BCOLOR,
                "strikethrough", PREV_COL_STRIKE,
                "text", col_num + PREV_N_FIXED_COLS -1, nullptr);

        /* We want a monospace font fixed-width data is properly displayed. */
        g_object_set (G_OBJECT(renderer), "family", "monospace", nullptr);

        /* Add a combobox to select column types as column header. Each uses the same
         * common model for the dropdown list. The selected value is taken
         * from the column_types vector. */
        auto cbox = preview_cbox_factory (GTK_TREE_MODEL(model), col_num - 1);
        gtk_tree_view_column_set_widget (col, cbox);

        /* Enable resizing of the columns. */
        gtk_tree_view_column_set_resizable (col, true);
        gtk_tree_view_column_set_clickable (col, true);
    }
}

/* Helper to create a shared store for the header comboboxes in the preview treeview.
 * It holds the possible column types */
static GtkTreeModel*
make_column_header_model_price (void)
{
    auto combostore = gtk_list_store_new (2, G_TYPE_STRING, G_TYPE_INT);
    for (auto col_type : gnc_price_col_type_strs)
    {
        GtkTreeIter iter;
        gtk_list_store_append (combostore, &iter);
        gtk_list_store_set (combostore, &iter,
                COL_TYPE_NAME, _(col_type.second),
                COL_TYPE_ID, static_cast<int>(col_type.first), -1);
    }
    return GTK_TREE_MODEL(combostore);
}

/* Updates the preview treeview to show the data as parsed based on the user's
 * import parameters.
 */
void CsvImpPriceAssist::preview_refresh_table ()
{
    preview_validate_settings ();

    /* Create a new liststore to hold status and data from the file being imported.
       The first columns hold status information (row-color, row-errors, row-error-icon,...
       All following columns represent the tokenized data as strings. */
    auto ncols = PREV_N_FIXED_COLS + price_imp->column_types_price().size();
    auto model_col_types = g_new (GType, ncols);
    model_col_types[PREV_COL_FCOLOR] = G_TYPE_STRING;
    model_col_types[PREV_COL_BCOLOR] = G_TYPE_STRING;
    model_col_types[PREV_COL_ERROR] = G_TYPE_STRING;
    model_col_types[PREV_COL_ERR_ICON] = G_TYPE_STRING;
    model_col_types[PREV_COL_STRIKE] = G_TYPE_BOOLEAN;
    for (guint i = PREV_N_FIXED_COLS; i <  ncols; i++)
        model_col_types[i] = G_TYPE_STRING;
    auto store = gtk_list_store_newv (ncols, model_col_types);
    g_free (model_col_types);

    /* Fill the data liststore with data from importer object. */
    for (auto parse_line : price_imp->m_parsed_lines)
    {
        /* Fill the state cells */
        GtkTreeIter iter;
        gtk_list_store_append (store, &iter);
        preview_row_fill_state_cells (store, &iter,
                std::get<PL_ERROR>(parse_line), std::get<PL_SKIP>(parse_line));

        /* Fill the data cells. */
        for (auto cell_str_it = std::get<PL_INPUT>(parse_line).cbegin(); cell_str_it != std::get<PL_INPUT>(parse_line).cend(); cell_str_it++)
        {
            uint32_t pos = PREV_N_FIXED_COLS + cell_str_it - std::get<PL_INPUT>(parse_line).cbegin();
            gtk_list_store_set (store, &iter, pos, cell_str_it->c_str(), -1);
        }
    }
    gtk_tree_view_set_model (treeview, GTK_TREE_MODEL(store));
    gtk_tree_view_set_tooltip_column (treeview, PREV_COL_ERROR);

    /* Adjust treeview to go with the just created model. This consists of adding
     * or removing columns and resetting any parameters related to how
     * the columns and data should be rendered.
     */

    /* Start with counting the current number of columns (ntcols)
     * we have in the treeview */
    auto ntcols = gtk_tree_view_get_n_columns (treeview);

    /* Drop redundant columns if the model has less data columns than the new model
     * ntcols = n° of columns in treeview (1 error column + x data columns)
     * ncols = n° of columns in model (fixed state columns + x data columns)
     */
    while (ntcols > ncols - PREV_N_FIXED_COLS + 1)
    {
        auto col = gtk_tree_view_get_column (treeview, ntcols - 1);
        gtk_tree_view_column_clear (col);
        ntcols = gtk_tree_view_remove_column(treeview, col);
    }

    /* Insert columns if the model has more data columns than the treeview. */
    while (ntcols < ncols - PREV_N_FIXED_COLS + 1)
    {
        /* Default cell renderer is text, except for the first (error)
           column uses an icon */
        auto renderer = (ntcols == 0) ? gtk_cell_renderer_pixbuf_new () : gtk_cell_renderer_text_new ();
        auto col = gtk_tree_view_column_new ();
        gtk_tree_view_column_pack_start (col, renderer, false);
        ntcols = gtk_tree_view_append_column (treeview, col);
    }

    /* Reset column attributes as they are undefined after recreating the model */
    auto combostore = make_column_header_model_price ();
    for (uint32_t i = 0; i < ntcols; i++)
        preview_style_column (i, combostore);

    auto column_types = price_imp->column_types_price();
    auto any_of_type = [](std::vector<GncPricePropType>& column_types,
                          GncPricePropType req_column_type) -> bool
    {
        return std::any_of (column_types.begin(), column_types.end(),
                            [&req_column_type](GncPricePropType column_type) -> bool
                            { return column_type == req_column_type; });
    };

    // look for a namespace column, clear the commodity combo
    if (any_of_type (column_types, GncPricePropType::FROM_NAMESPACE))
    {
        g_signal_handlers_block_by_func (commodity_selector, (gpointer) csv_price_imp_preview_commodity_sel_cb, this);
        set_commodity_for_combo (GTK_COMBO_BOX(commodity_selector), nullptr);
        g_signal_handlers_unblock_by_func (commodity_selector, (gpointer) csv_price_imp_preview_commodity_sel_cb, this);
    }

    // look for a symbol column, clear the commodity combo
    if (any_of_type (column_types, GncPricePropType::FROM_SYMBOL))
    {
        g_signal_handlers_block_by_func (commodity_selector, (gpointer) csv_price_imp_preview_commodity_sel_cb, this);
        set_commodity_for_combo (GTK_COMBO_BOX(commodity_selector), nullptr);
        g_signal_handlers_unblock_by_func (commodity_selector, (gpointer) csv_price_imp_preview_commodity_sel_cb, this);
    }

    // look for a currency column, clear the currency combo
    if (any_of_type (column_types, GncPricePropType::TO_CURRENCY))
    {
        g_signal_handlers_block_by_func (currency_selector, (gpointer) csv_price_imp_preview_currency_sel_cb, this);
        set_commodity_for_combo (GTK_COMBO_BOX(currency_selector), nullptr);
        g_signal_handlers_unblock_by_func (currency_selector, (gpointer) csv_price_imp_preview_currency_sel_cb, this);
    }

    /* Release our reference for the stores to allow proper memory management. */
    g_object_unref (store);
    g_object_unref (combostore);

    /* Make the things actually appear. */
    gtk_widget_show_all (GTK_WIDGET(treeview));
}

/* Update the preview page based on the current state of the importer.
 * Should be called when settings are changed.
 */
void
CsvImpPriceAssist::preview_refresh ()
{
    // Cache skip settings. Updating the widgets one by one
    // triggers a callback that transfers all skip widgets'
    // values to settings. So by the time the next widget value
    // is to be set, that widget's 'new' setting has already been
    // replaced by its old setting preveneting us from using it
    // here sensibly.

    auto skip_start_lines = price_imp->skip_start_lines();
    auto skip_end_lines = price_imp->skip_end_lines();
    auto skip_alt_lines = price_imp->skip_alt_lines();

    // Set start row
    auto adj = gtk_spin_button_get_adjustment (start_row_spin);
    gtk_adjustment_set_upper (adj, price_imp->m_parsed_lines.size());
    gtk_spin_button_set_value (start_row_spin, skip_start_lines);

    // Set end row
    adj = gtk_spin_button_get_adjustment (end_row_spin);
    gtk_adjustment_set_upper (adj, price_imp->m_parsed_lines.size());
    gtk_spin_button_set_value (end_row_spin, skip_end_lines);

    // Set Alternate rows
    gtk_toggle_button_set_active (GTK_TOGGLE_BUTTON(skip_alt_rows_button),
                                  skip_alt_lines);

    // Set over-write indicator
    gtk_toggle_button_set_active (GTK_TOGGLE_BUTTON(over_write_cbutton),
                                  price_imp->over_write());

    // Set Import Format
    gtk_toggle_button_set_active (GTK_TOGGLE_BUTTON(csv_button),
            (price_imp->file_format() == GncImpFileFormat::CSV));
    gtk_toggle_button_set_active (GTK_TOGGLE_BUTTON(fixed_button),
            (price_imp->file_format() != GncImpFileFormat::CSV));

    // This section deals with the combo's and character encoding
    gtk_combo_box_set_active (GTK_COMBO_BOX(date_format_combo),
            price_imp->date_format());
    gtk_combo_box_set_active (GTK_COMBO_BOX(currency_format_combo),
            price_imp->currency_format());
    go_charmap_sel_set_encoding (encselector, price_imp->encoding().c_str());

    // Set the commodity and currency combos
    set_commodity_for_combo(GTK_COMBO_BOX(commodity_selector),
            price_imp->from_commodity());

    set_commodity_for_combo(GTK_COMBO_BOX(currency_selector),
            price_imp->to_currency());

    // Handle separator checkboxes and custom field, only relevant if the file format is csv
    // Note we defer the change signal until all buttons have been updated
    // An early update may result in an incomplete tokenize run that would
    // cause our list of saved column types to be truncated
    if (price_imp->file_format() == GncImpFileFormat::CSV)
    {
        auto separators = price_imp->separators();
        const auto stock_sep_chars = std::string (" \t,:;-");

        for (int i = 0; i < SEP_NUM_OF_TYPES; i++)
        {
            g_signal_handlers_block_by_func (sep_button[i], (gpointer) csv_price_imp_preview_sep_button_cb, this);
            gtk_toggle_button_set_active (GTK_TOGGLE_BUTTON(sep_button[i]),
                separators.find (stock_sep_chars[i]) != std::string::npos);
            g_signal_handlers_unblock_by_func (sep_button[i], (gpointer) csv_price_imp_preview_sep_button_cb, this);
        }

        // If there are any other separators in the separators string,
        // add them as custom separators
        auto pos = separators.find_first_of (stock_sep_chars);
        while (!separators.empty() && pos != std::string::npos)
        {
            separators.erase(pos);
            pos = separators.find_first_of (stock_sep_chars);
        }
        g_signal_handlers_block_by_func (custom_cbutton, (gpointer) csv_price_imp_preview_sep_button_cb, this);
        g_signal_handlers_block_by_func (custom_entry, (gpointer) csv_price_imp_preview_sep_button_cb, this);

        gtk_toggle_button_set_active (GTK_TOGGLE_BUTTON(custom_cbutton),
                                      !separators.empty());
        gtk_entry_set_text (GTK_ENTRY(custom_entry), separators.c_str());

        g_signal_handlers_unblock_by_func (custom_cbutton, (gpointer) csv_price_imp_preview_sep_button_cb, this);
        g_signal_handlers_unblock_by_func (custom_entry, (gpointer) csv_price_imp_preview_sep_button_cb, this);
        csv_price_imp_preview_sep_button_cb (GTK_WIDGET(custom_cbutton), this);
    }
    // Repopulate the parsed data table
    g_idle_add ((GSourceFunc)csv_imp_preview_queue_rebuild_table, this);
}

/* Check if all selected data can be parsed sufficiently to continue
 */
void CsvImpPriceAssist::preview_validate_settings ()
{
    /* Allow the user to proceed only if there are no inconsistencies in the settings */
    auto error_msg = price_imp->verify();
    gtk_assistant_set_page_complete (csv_imp_asst, preview_page, error_msg.empty());
    gtk_label_set_markup(GTK_LABEL(instructions_label), error_msg.c_str());
    gtk_widget_set_visible (GTK_WIDGET(instructions_image), !error_msg.empty());
}

/*******************************************************
 * Assistant page prepare functions
 *******************************************************/

void
CsvImpPriceAssist::assist_file_page_prepare ()
{
    /* Disable the "Next" Assistant Button */
    gtk_assistant_set_page_complete (csv_imp_asst, file_page, false);
    gtk_assistant_set_page_complete (csv_imp_asst, preview_page, false);

    /* Set the default directory */
    if (!m_final_file_name.empty())
        gtk_file_chooser_set_filename (GTK_FILE_CHOOSER(file_chooser),
                                       m_final_file_name.c_str());
    else
    {
        auto starting_dir = gnc_get_default_directory (GNC_PREFS_GROUP);
        if (starting_dir)
        {
            gtk_file_chooser_set_current_folder (GTK_FILE_CHOOSER(file_chooser), starting_dir);
            g_free (starting_dir);
        }
    }
}

void
CsvImpPriceAssist::assist_preview_page_prepare ()
{
    auto go_back = false;


    if (m_final_file_name != m_fc_file_name)
    {
        /* Load the file into parse_data. */
        price_imp = std::unique_ptr<GncPriceImport>(new GncPriceImport);
        /* Assume data is CSV. User can later override to Fixed Width if needed */
        try
        {
            price_imp->file_format (GncImpFileFormat::CSV);
            price_imp->load_file (m_fc_file_name);
            price_imp->tokenize (true);

            /* Get settings store and populate */
            preview_populate_settings_combo();
            gtk_combo_box_set_active (settings_combo, 0);

            // set over_write to false as default
            price_imp->over_write (false);

            /* Disable the "Next" Assistant Button */
            gtk_assistant_set_page_complete (csv_imp_asst, preview_page, false);
        }
        catch (std::ifstream::failure& e)
        {
            /* File loading failed ... */
            gnc_error_dialog (GTK_WINDOW(csv_imp_asst), "%s", e.what());
            go_back = true;
        }
        catch (std::range_error &e)
        {
            /* Parsing failed ... */
            gnc_error_dialog (GTK_WINDOW(csv_imp_asst), "%s", _(e.what()));
            go_back = true;
        }
    }

    if (go_back)
        gtk_assistant_previous_page (csv_imp_asst);
    else
    {
        m_final_file_name = m_fc_file_name;
        preview_refresh ();

        /* Load the data into the treeview. */
        g_idle_add ((GSourceFunc)csv_imp_preview_queue_rebuild_table, this);
    }
}

void
CsvImpPriceAssist::assist_confirm_page_prepare ()
{
    /* Confirm Page */
}

void
CsvImpPriceAssist::assist_summary_page_prepare ()
{
    auto text = std::string("<span size=\"medium\"><b>");
    /* Translators: This is a ngettext(3) message, %d is the number of prices added */
    auto added_str = g_strdup_printf (ngettext ("%d added price",
                                                "%d added prices",
                                                price_imp->m_prices_added),
                                                price_imp->m_prices_added);
    /* Translators: This is a ngettext(3) message, %d is the number of duplicate prices */
    auto dupl_str = g_strdup_printf (ngettext ("%d duplicate price",
                                               "%d duplicate prices",
                                               price_imp->m_prices_duplicated),
                                               price_imp->m_prices_duplicated);
    /* Translators: This is a ngettext(3) message, %d is the number of replaced prices */
    auto repl_str = g_strdup_printf (ngettext ("%d replaced price",
                                               "%d replaced prices",
                                               price_imp->m_prices_replaced),
                                               price_imp->m_prices_replaced);
    auto msg = g_strdup_printf (
        _("The prices were imported from file '%s'.\n\n"
          "Import summary:\n"
          "- %s\n"
          "- %s\n"
          "- %s"),
          m_final_file_name.c_str(), added_str, dupl_str,repl_str);
    text += msg;
    text += "</b></span>";

    g_free (added_str);
    g_free (dupl_str);
    g_free (repl_str);

    gtk_label_set_markup (GTK_LABEL(summary_label), text.c_str());
}

void
CsvImpPriceAssist::assist_prepare_cb (GtkWidget *page)
{
    if (page == file_page)
        assist_file_page_prepare ();
    else if (page == preview_page)
        assist_preview_page_prepare ();
    else if (page == confirm_page)
        assist_confirm_page_prepare ();
    else if (page == summary_page)
        assist_summary_page_prepare ();
}

void
CsvImpPriceAssist::assist_finish ()
{
    /* Start the import */
    /* Create prices from the parsed data */
    try
    {
        price_imp->create_prices ();
    }
    catch (const std::invalid_argument& err)
    {
        /* Oops! This shouldn't happen when using the import assistant !
         * Inform the user and go back to the preview page.
         */
        gnc_error_dialog (GTK_WINDOW(csv_imp_asst),
            _("An unexpected error has occurred while creating prices. Please report this as a bug.\n\n"
              "Error message:\n%s"), err.what());
        gtk_assistant_set_current_page (csv_imp_asst, 2);
    }
}

void
CsvImpPriceAssist::assist_compmgr_close ()
{
    gnc_save_window_size (GNC_PREFS_GROUP, GTK_WINDOW(csv_imp_asst));
}

static void
csv_price_imp_close_handler (gpointer user_data)
{
    auto info = (CsvImpPriceAssist*)user_data;
    gnc_unregister_gui_component_by_data (ASSISTANT_CSV_IMPORT_PRICE_CM_CLASS, info);
    info->assist_compmgr_close();
    delete info;
}

/********************************************************************\
 * gnc_file_csv_price_import                                        *
 * opens up a assistant to import prices.                           *
 *                                                                  *
 * Args:   none                                                     *
 * Return: nothing                                                  *
\********************************************************************/
void
gnc_file_csv_price_import(void)
{
    auto info = new CsvImpPriceAssist;
    gnc_register_gui_component (ASSISTANT_CSV_IMPORT_PRICE_CM_CLASS,
                                nullptr, csv_price_imp_close_handler,
                                info);
}