/****************************************************************************
**
** Copyright (C) 2016 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the V4VM module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:GPL-EXCEPT$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see https://www.qt.io/terms-conditions. For further
** information use the contact form at https://www.qt.io/contact-us.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3 as published by the Free Software
** Foundation with exceptions as appearing in the file LICENSE.GPL3-EXCEPT
** included in the packaging of this file. Please review the following
** information to ensure the GNU General Public License requirements will
** be met: https://www.gnu.org/licenses/gpl-3.0.html.
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** $QT_END_LICENSE$
**
****************************************************************************/

#include "private/qv4object_p.h"
#include "private/qv4runtime_p.h"
#include "private/qv4functionobject_p.h"
#include "private/qv4errorobject_p.h"
#include "private/qv4globalobject_p.h"
#include "private/qv4codegen_p.h"
#if QT_CONFIG(qml_interpreter)
#include "private/qv4isel_moth_p.h"
#include "private/qv4vme_moth_p.h"
#endif
#include "private/qv4objectproto_p.h"
#include "private/qv4isel_p.h"
#include "private/qv4mm_p.h"
#include "private/qv4context_p.h"
#include "private/qv4script_p.h"
#include "private/qv4string_p.h"
#include "private/qqmlbuiltinfunctions_p.h"

#ifdef V4_ENABLE_JIT
#  include "private/qv4isel_masm_p.h"
#else
QT_REQUIRE_CONFIG(qml_interpreter);
#endif // V4_ENABLE_JIT

#include <QtCore/QCoreApplication>
#include <QtCore/QFile>
#include <QtCore/QFileInfo>
#include <QtCore/QDateTime>
#include <private/qqmljsengine_p.h>
#include <private/qqmljslexer_p.h>
#include <private/qqmljsparser_p.h>
#include <private/qqmljsast_p.h>

#include <iostream>

static void showException(QV4::ExecutionContext *ctx, const QV4::Value &exception, const QV4::StackTrace &trace)
{
    QV4::Scope scope(ctx);
    QV4::ScopedValue ex(scope, exception);
    QV4::ErrorObject *e = ex->as<QV4::ErrorObject>();
    if (!e) {
        std::cerr << "Uncaught exception: " << qPrintable(ex->toQString()) << std::endl;
    } else {
        QV4::ScopedString m(scope, scope.engine->newString(QStringLiteral("message")));
        QV4::ScopedValue message(scope, e->get(m));
        std::cerr << "Uncaught exception: " << qPrintable(message->toQStringNoThrow()) << std::endl;
    }

    for (const QV4::StackFrame &frame : trace) {
        std::cerr << "    at " << qPrintable(frame.function) << " (" << qPrintable(frame.source);
        if (frame.line >= 0)
            std::cerr << ':' << frame.line;
        std::cerr << ')' << std::endl;
    }
}

int main(int argc, char *argv[])
{
    QCoreApplication app(argc, argv);
    QCoreApplication::setApplicationVersion(QLatin1String(QT_VERSION_STR));
    QStringList args = app.arguments();
    args.removeFirst();

    enum {
        use_masm,
        use_moth
    } mode;
#ifdef V4_ENABLE_JIT
    mode = use_masm;
#else
    mode = use_moth;
#endif

    bool runAsQml = false;
    bool cache = false;

    if (!args.isEmpty()) {
        if (args.constFirst() == QLatin1String("--jit")) {
            mode = use_masm;
            args.removeFirst();
        }

#if QT_CONFIG(qml_interpreter)
        if (args.constFirst() == QLatin1String("--interpret")) {
            mode = use_moth;
            args.removeFirst();
        }
#endif

        if (args.constFirst() == QLatin1String("--qml")) {
            runAsQml = true;
            args.removeFirst();
        }

        if (args.constFirst() == QLatin1String("--cache")) {
            cache = true;
            args.removeFirst();
        }

        if (args.constFirst() == QLatin1String("--help")) {
            std::cerr << "Usage: qmljs [|--jit|--interpret|--qml] file..." << std::endl;
            return EXIT_SUCCESS;
        }
    }

    switch (mode) {
    case use_masm:
    case use_moth: {
        QV4::EvalISelFactory* iSelFactory = 0;
        if (mode == use_moth) {
#if QT_CONFIG(qml_interpreter)
            iSelFactory = new QV4::Moth::ISelFactory;
#endif
#ifdef V4_ENABLE_JIT
        } else {
            iSelFactory = new QV4::JIT::ISelFactory<>;
#endif // V4_ENABLE_JIT
        }

        QV4::ExecutionEngine vm(iSelFactory);

        QV4::Scope scope(&vm);
        QV4::ScopedContext ctx(scope, vm.rootContext());

        QV4::GlobalExtensions::init(vm.globalObject, QJSEngine::ConsoleExtension | QJSEngine::GarbageCollectionExtension);

        for (const QString &fn : qAsConst(args)) {
            QFile file(fn);
            if (file.open(QFile::ReadOnly)) {
                QScopedPointer<QV4::Script> script;
                if (cache && QFile::exists(fn + QLatin1Char('c'))) {
                    QQmlRefPointer<QV4::CompiledData::CompilationUnit> unit = iSelFactory->createUnitForLoading();
                    QString error;
                    if (unit->loadFromDisk(QUrl::fromLocalFile(fn), QFileInfo(fn).lastModified(), iSelFactory, &error)) {
                        script.reset(new QV4::Script(&vm, nullptr, unit));
                    } else {
                        std::cout << "Error loading" << qPrintable(fn) << "from disk cache:" << qPrintable(error) << std::endl;
                    }
                }
                if (!script) {
                    const QString code = QString::fromUtf8(file.readAll());
                    file.close();

                    script.reset(new QV4::Script(ctx, code, fn));
                    script->parseAsBinding = runAsQml;
                    script->parse();
                }
                QV4::ScopedValue result(scope);
                if (!scope.engine->hasException) {
                    const auto unit = script->compilationUnit;
                    if (cache && unit && !(unit->data->flags & QV4::CompiledData::Unit::StaticData)) {
                        if (unit->data->sourceTimeStamp == 0) {
                            const_cast<QV4::CompiledData::Unit*>(unit->data)->sourceTimeStamp = QFileInfo(fn).lastModified().toMSecsSinceEpoch();
                        }
                        QString saveError;
                        if (!unit->saveToDisk(QUrl::fromLocalFile(fn), &saveError)) {
                            std::cout << "Error saving JS cache file: " << qPrintable(saveError) << std::endl;
                        }
                    }
                    result = script->run();
                }
                if (scope.engine->hasException) {
                    QV4::StackTrace trace;
                    QV4::ScopedValue ex(scope, scope.engine->catchException(&trace));
                    showException(ctx, ex, trace);
                    return EXIT_FAILURE;
                }
                if (!result->isUndefined()) {
                    if (! qgetenv("SHOW_EXIT_VALUE").isEmpty())
                        std::cout << "exit value: " << qPrintable(result->toQString()) << std::endl;
                }
            } else {
                std::cerr << "Error: cannot open file " << fn.toUtf8().constData() << std::endl;
                return EXIT_FAILURE;
            }
        }
    } return EXIT_SUCCESS;
    } // switch (mode)
}