/*
   Copyright (C) 2007 - 2015
   Part of the Battle for Wesnoth Project http://www.wesnoth.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.

   See the COPYING file for more details.
*/
#ifndef MULTIPLAYER_UI_HPP_INCLUDED
#define MULTIPLAYER_UI_HPP_INCLUDED

#include "chat_events.hpp"
#include "hotkey/command_executor.hpp"
#include "network.hpp"
#include "preferences_display.hpp"
#include "widgets/combo.hpp"
#include "widgets/label.hpp"
#include "widgets/menu.hpp"
#include "widgets/textbox.hpp"

#include <deque>

class display;
class game_display;
class config;
class game_state;

namespace mp {

std::string get_color_string(int id);

/** this class memorizes a chat session. */
class chat
{
public:
	chat();

	void add_message(const time_t& time, const std::string& user,
			const std::string& message);

	void init_textbox(gui::textbox& textbox);
	void update_textbox(gui::textbox& textbox);

	void clear_history();

private:
	struct msg {
		msg(const time_t& time, const std::string& user, const std::string& message)
			: time(time), user(user), message(message) {}
		time_t time;
		std::string user;
		std::string message;
	};
	typedef std::deque<msg> msg_hist;

	std::string format_message(const msg& message);
	SDL_Color color_message(const msg& message);

	msg_hist message_history_;
	msg_hist::size_type last_update_;
};

/**
 * a base class for the different multiplayer base dialogs: game list, create
 * game, wait game, game setup.
 */
class ui : public gui::widget, private events::chat_handler, private font::floating_label_context
{
public:
	enum result { CONTINUE, JOIN, OBSERVE, CREATE, LOAD_GAME, PREFERENCES,
		PLAY, QUIT };

	ui(game_display& d, const std::string& title,
			const config& cfg, chat& c, config& gamelist);

	/**
	 * Asks the multiplayer_ui to pump some data from the network, and then to
	 * process it. The actual processing will be left to the child classes,
	 * through process_network_data and process_network_error.
	 */
	void process_network();

	/**
	 * Returns the result of the current widget. While the result is equal to
	 * continue, the widget should not be destroyed.
	 */
	result get_result();

	/**
	 * Hides children, moves them (using layout_children), then shows them.
	 *
	 * The methodes hide_children and layout_children are supposed to be
	 * overridden by subclasses of this class which add new sub-widgets.
	 */
	void set_location(const SDL_Rect& rect);
	using widget::set_location;

protected:
	int xscale(int x) const;
	int yscale(int y) const;
	static const int xscale_base;
	static const int yscale_base;

	SDL_Rect client_area() const;

	game_display& disp_;
	game_display& disp() { return disp_; }

	/**
	 * Returns the main game config, as defined by loading the preprocessed WML
	 * files. Children of this class may need this to obtain, for example, the
	 * list of available eras.
	 */
	const config& game_config() const;

	virtual void draw_contents();

	virtual void process_event();

	virtual void handle_event(const SDL_Event& event);
	virtual void handle_key_event(const SDL_KeyboardEvent& event);

	/** Override chat_handler. */
	void add_chat_message(const time_t& time, const std::string& speaker,
			int side, const std::string& message,
			events::chat_handler::MESSAGE_TYPE type=events::chat_handler::MESSAGE_PRIVATE);
	void send_chat_message(const std::string& message, bool allies_only=false);

	/** Process chat messages. */
	void process_message(const config& msg, const bool whisper=false);

	/**
	 * Processes any pending network data. Called by the public
	 * process_network() method. Overridden by subclasses who add more
	 * behavior for network.
	 */
	virtual void process_network_data(const config& data, const network::connection sock);

	/**
	 * Processes any pending network error. Called by the public
	 * process_network() method. Overridden by subclasses.
	 */
	virtual void process_network_error(network::error& error);

	/**
	 * Return true if we must accept incoming connections, false if not.
	 * Defaults to not.
	 */
	virtual bool accept_connections() { return false; }

	/** Processes a pending network connection. */
	virtual void process_network_connection(const network::connection sock);

	/**
	 * Hides or shows all gui::widget children of this widget. Should be
	 * overridden by subclasses which add their own children.
	 */
	virtual void hide_children(bool hide=true);

	/**
	 * Lays the children out. This method is to be overridden by the subclasses
	 * of the mp_ui class; it will be called.
	 */
	virtual void layout_children(const SDL_Rect& rect);

	/** Sets the result of this dialog, to be checked by get_result(). */
	result set_result(result res);

	/**
	 * Sets the name of the selected game which is used to highlight the names
	 * of the players which have joined this game.
	 */
	void set_selected_game(const std::string& game_name);

	/**
	 * Called each time the gamelist_ variable is updated. May be
	 * overridden by child classes to add custom gamelist behavior.
	 */
	virtual void gamelist_updated(bool silent=true);

	/** Sets the user list */
	void set_user_list(const std::vector<std::string>&, bool silent);
	void set_user_menu_items(const std::vector<std::string>& list);

	/** Returns the current gamelist */
	config& gamelist() { return gamelist_; }

	void append_to_title(const std::string& name);
	const gui::label& title() const;

	std::string get_selected_user_game();
	bool selected_user_changed() const { return selected_user_changed_; }
	void set_selected_user_changed(const bool& changed) { selected_user_changed_ = changed; }

private:
	/**
	 * Set to true when the widgets are initialized. Allows delayed
	 * initialization on first positioning.
	 */
	bool initialized_;
	bool gamelist_initialized_;

	/** Ensures standard hotkeys are correctly handled. */
	const hotkey::basic_handler hotkey_handler_;

	const preferences::display_manager disp_manager_;

	/**
	 * The main game configuration, as defined by loading the preprocessed WML
	 * files. Access using the game_config() method if necessary.
	 */
	const config& game_config_;

	chat& chat_;

	config& gamelist_;

	gui::label title_;
	gui::textbox entry_textbox_;
	gui::textbox chat_textbox_;

	gui::menu users_menu_;

	std::vector<std::string> user_list_;

	std::string selected_game_;

	std::string selected_user_;
	bool selected_user_changed_;

	result result_;

	bool gamelist_refresh_;

	Uint32 lobby_clock_;

public:
	enum user_relation { ME, FRIEND, NEUTRAL, IGNORED };
	enum user_state    { LOBBY, GAME, SEL_GAME };

private:
	struct user_info
	{
		user_info() :
			name(),
			game_id(),
			location(),
			relation(ME),
			state(LOBBY),
			registered()
		{
		}

		std::string    name;
		std::string    game_id;
		std::string    location;
		user_relation  relation;
		user_state     state;
		/** True if this user is registered on the server. */
		bool           registered;
		bool operator> (const user_info& b) const;
	};
};

}

#endif