/***************************************************************************
 *   Copyright (C) 2008 by Pino Toscano <pino@kde.org>                     *
 *   Copyright (C) 2008 by Harri Porten <porten@kde.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.                                   *
 ***************************************************************************/

#include "kjs_app_p.h"

#include <kjs_version.h>
#include <kjs/kjsarguments.h>
#include <kjs/kjsinterpreter.h>
#include <kjs/kjsobject.h>
#include <kjs/kjsprototype.h>

#include <qapplication.h>

#include <QLocale>
#include <QTimer>

#include <KLocalizedString>
#include <QMessageBox>
#include <QCheckBox>

#include "../document_p.h"
#include "../scripter.h"
#include "config-okular.h"
#include "kjs_fullscreen_p.h"

using namespace Okular;

#define OKULAR_TIMERID QStringLiteral( "okular_timerID" )

static KJSPrototype *g_appProto;
typedef QHash< int, QTimer * > TimerCache;
Q_GLOBAL_STATIC( TimerCache, g_timerCache )

// the acrobat version we fake
static const double fake_acroversion = 8.00;

static const struct FakePluginInfo {
    const char *name;
    bool certified;
    bool loaded;
    const char *path;
} s_fake_plugins[] = {
    { "Annots", true, true, "" },
    { "EFS", true, true, "" },
    { "EScript", true, true, "" },
    { "Forms", true, true, "" },
    { "ReadOutLoud", true, true, "" },
    { "WebLink", true, true, "" }
};
static const int s_num_fake_plugins = sizeof( s_fake_plugins ) / sizeof( s_fake_plugins[0] );


static KJSObject appGetFormsVersion( KJSContext *, void * )
{
    // faking a bit...
    return KJSNumber( fake_acroversion );
}

static KJSObject appGetLanguage( KJSContext *, void * )
{
    QLocale locale;
    QString lang = QLocale::languageToString(locale.language());
    QString country = QLocale::countryToString(locale.country());
    QString acroLang = QStringLiteral( "ENU" );
    if ( lang == QLatin1String( "da" ) )
        acroLang = QStringLiteral( "DAN" ); // Danish
    else if ( lang == QLatin1String( "de" ) )
        acroLang = QStringLiteral( "DEU" ); // German
    else if ( lang == QLatin1String( "en" ) )
        acroLang = QStringLiteral( "ENU" ); // English
    else if ( lang == QLatin1String( "es" ) )
        acroLang = QStringLiteral( "ESP" ); // Spanish
    else if ( lang == QLatin1String( "fr" ) )
        acroLang = QStringLiteral( "FRA" ); // French
    else if ( lang == QLatin1String( "it" ) )
        acroLang = QStringLiteral( "ITA" ); // Italian
    else if ( lang == QLatin1String( "ko" ) )
        acroLang = QStringLiteral( "KOR" ); // Korean
    else if ( lang == QLatin1String( "ja" ) )
        acroLang = QStringLiteral( "JPN" ); // Japanese
    else if ( lang == QLatin1String( "nl" ) )
        acroLang = QStringLiteral( "NLD" ); // Dutch
    else if ( lang == QLatin1String( "pt" ) && country == QLatin1String( "BR" ) )
        acroLang = QStringLiteral( "PTB" ); // Brazilian Portuguese
    else if ( lang == QLatin1String( "fi" ) )
        acroLang = QStringLiteral( "SUO" ); // Finnish
    else if ( lang == QLatin1String( "sv" ) )
        acroLang = QStringLiteral( "SVE" ); // Swedish
    else if ( lang == QLatin1String( "zh" ) && country == QLatin1String( "CN" ) )
        acroLang = QStringLiteral( "CHS" ); // Chinese Simplified
    else if ( lang == QLatin1String( "zh" ) && country == QLatin1String( "TW" ) )
        acroLang = QStringLiteral( "CHT" ); // Chinese Traditional
    return KJSString( acroLang );
}

static KJSObject appGetNumPlugins( KJSContext *, void * )
{
    return KJSNumber( s_num_fake_plugins );
}

static KJSObject appGetPlatform( KJSContext *, void * )
{
#if defined(Q_OS_WIN)
    return KJSString( QString::fromLatin1( "WIN" ) );
#elif defined(Q_OS_MAC)
    return KJSString( QString::fromLatin1( "MAC" ) );
#else
    return KJSString( QStringLiteral( "UNIX" ) );
#endif
}

static KJSObject appGetPlugIns( KJSContext *context, void * )
{
    KJSArray plugins( context, s_num_fake_plugins );
    for ( int i = 0; i < s_num_fake_plugins; ++i )
    {
        const FakePluginInfo &info = s_fake_plugins[i];
        KJSObject plugin;
        plugin.setProperty( context, QStringLiteral("certified"), info.certified );
        plugin.setProperty( context, QStringLiteral("loaded"), info.loaded );
        plugin.setProperty( context, QStringLiteral("name"), info.name );
        plugin.setProperty( context, QStringLiteral("path"), info.path );
        plugin.setProperty( context, QStringLiteral("version"), fake_acroversion );
        plugins.setProperty( context, QString::number( i ), plugin );
    }
    return plugins;
}

static KJSObject appGetPrintColorProfiles( KJSContext *context, void * )
{
    return KJSArray( context, 0 );
}

static KJSObject appGetPrinterNames( KJSContext *context, void * )
{
    return KJSArray( context, 0 );
}

static KJSObject appGetViewerType( KJSContext *, void * )
{
    // faking a bit...
    return KJSString( QStringLiteral( "Reader" ) );
}

static KJSObject appGetViewerVariation( KJSContext *, void * )
{
    // faking a bit...
    return KJSString( QStringLiteral( "Reader" ) );
}

static KJSObject appGetViewerVersion( KJSContext *, void * )
{
    // faking a bit...
    return KJSNumber( fake_acroversion );
}

/*
    Alert function defined in the reference, it shows a Dialog Box with options.
    app.alert()
*/
static KJSObject appAlert( KJSContext *context, void *,
                          const KJSArguments &arguments )
{
    if ( arguments.count() < 1 )
    {
        return context->throwException( i18n( "Missing alert type") );
    }
    QString cMsg = arguments.at( 0 ).toString( context );
    int nIcon = 0;
    int nType = 0;
    QString cTitle = QStringLiteral("Okular");

    if( arguments.count() >= 2 )
        nIcon = arguments.at( 1 ).toInt32( context );
    if( arguments.count() >= 3 )
        nType = arguments.at( 2 ).toInt32( context );
    if( arguments.count() >= 4 )
        cTitle = arguments.at( 3 ).toString( context );

    QMessageBox::Icon icon;
    switch( nIcon )
    {
        case 0:
            icon = QMessageBox::Critical;
            break;
        case 1:
            icon = QMessageBox::Warning;
            break;     
        case 2:
            icon = QMessageBox::Question;
            break;
        case 3:
            icon = QMessageBox::Information;
            break;     
    }

    QMessageBox box( icon, cTitle, cMsg );

    switch( nType )
    {
        case 0:
            box.setStandardButtons( QMessageBox::Ok );
            break;
        case 1:
            box.setStandardButtons( QMessageBox::Ok | QMessageBox::Cancel );
            break;     
        case 2:
            box.setStandardButtons( QMessageBox::Yes | QMessageBox::No );
            break;
        case 3:
            box.setStandardButtons( QMessageBox::Yes | QMessageBox::No | QMessageBox::Cancel );
            break;    
    }

    QCheckBox *checkBox = nullptr;
    KJSObject oCheckbox;
    if( arguments.count() >= 6 )
    {
        oCheckbox = arguments.at( 5 );
        KJSObject oMsg = oCheckbox.property( context, QStringLiteral("cMsg") );
        QString msg = i18n( "Do not show this message again" );
        
        if( oMsg.isString() )
            msg = oMsg.toString( context );
        
        bool bInitialValue = false;       
        KJSObject value = oCheckbox.property( context, QStringLiteral("bInitialValue") );
        if( value.isBoolean() )
            bInitialValue = value.toBoolean( context );
        checkBox = new QCheckBox( msg );
        checkBox->setChecked( bInitialValue );
        box.setCheckBox( checkBox );

    }

#if KJS_VERSION > QT_VERSION_CHECK(5, 71, 0)
    // halt timeout until the user has responded
    context->interpreter().stopTimeoutCheck();
#endif

    int button = box.exec();

#if KJS_VERSION > QT_VERSION_CHECK(5, 71, 0)
    // restart max allowed time
    context->interpreter().startTimeoutCheck();
#endif

    int ret;

    switch( button )
    {
        case QMessageBox::Ok:
            ret = 1;
            break;
        case QMessageBox::Cancel:
            ret = 2;
            break;
        case QMessageBox::No:
            ret = 3;
            break;
        case QMessageBox::Yes:
            ret = 4;
            break;         
    }
    
    if( arguments.count() >= 6 )
        oCheckbox.setProperty( context, QStringLiteral( "bAfterValue" ), checkBox->isChecked() );

    delete checkBox;

    return KJSNumber( ret );
}

static KJSObject appBeep( KJSContext *context, void *,
                          const KJSArguments &arguments )
{
    if ( arguments.count() < 1 )
    {
        return context->throwException( QStringLiteral("Missing beep type") );
    }
    QApplication::beep();
    return KJSUndefined();
}

static KJSObject appGetNthPlugInName( KJSContext *context, void *,
                                      const KJSArguments &arguments )
{
    if ( arguments.count() < 1 )
    {
        return context->throwException( QStringLiteral("Missing plugin index") );
    }
    const int nIndex = arguments.at( 0 ).toInt32( context );

    if ( nIndex < 0 || nIndex >= s_num_fake_plugins )
        return context->throwException( QStringLiteral("PlugIn index out of bounds") );

    const FakePluginInfo &info = s_fake_plugins[nIndex];
    return KJSString( info.name );
}

static KJSObject appGoBack( KJSContext *, void *object,
                            const KJSArguments & )
{
    const DocumentPrivate *doc = reinterpret_cast< DocumentPrivate * >( object );
    if ( doc->m_parent->historyAtBegin() )
        return KJSUndefined();

    doc->m_parent->setPrevViewport();
    return KJSUndefined();
}

static KJSObject appGoForward( KJSContext *, void *object,
                               const KJSArguments & )
{
    const DocumentPrivate *doc = reinterpret_cast< DocumentPrivate * >( object );
    if ( doc->m_parent->historyAtEnd() )
        return KJSUndefined();

    doc->m_parent->setNextViewport();
    return KJSUndefined();
}

// app.setInterval()
static KJSObject appSetInterval( KJSContext *ctx, void *object,
                                      const KJSArguments &arguments )
{
    DocumentPrivate *doc = reinterpret_cast< DocumentPrivate * >( object );
    const QString function = arguments.at( 0 ).toString( ctx ) + ';';
    const int interval = arguments.at( 1 ).toInt32( ctx );

    QTimer *timer = new QTimer();

    QObject::connect( timer, &QTimer::timeout, doc->m_parent, [=](){ doc->executeScript( function ); } );

    timer->start( interval );

    return JSApp::wrapTimer( ctx, timer );
}

// app.clearInterval()
static KJSObject appClearInterval( KJSContext *ctx, void *,
                                      const KJSArguments &arguments )
{
    KJSObject timerObject = arguments.at( 0 );
    const int timerId = timerObject.property( ctx, OKULAR_TIMERID ).toInt32( ctx );
    QTimer *timer = g_timerCache->value( timerId );
    if( timer != nullptr )
    {
        timer->stop();
        g_timerCache->remove( timerId );
        delete timer;
    }

    return KJSUndefined();
}

// app.setTimeOut()
static KJSObject appSetTimeOut( KJSContext *ctx, void *object,
                                      const KJSArguments &arguments )
{
    DocumentPrivate *doc = reinterpret_cast< DocumentPrivate * >( object );
    const QString function = arguments.at( 0 ).toString( ctx ) + ';';
    const int interval = arguments.at( 1 ).toInt32( ctx );

    QTimer *timer = new QTimer();
    timer->setSingleShot( true );

    QObject::connect( timer, &QTimer::timeout, doc->m_parent, [=](){ doc->executeScript( function ); } );

    timer->start( interval );

    return JSApp::wrapTimer( ctx, timer );
}

// app.clearTimeOut()
static KJSObject appClearTimeOut( KJSContext *ctx, void *,
                                      const KJSArguments &arguments )
{
    KJSObject timerObject = arguments.at( 0 );
    const int timerId = timerObject.property( ctx, OKULAR_TIMERID ).toInt32( ctx );
    QTimer *timer = g_timerCache->value( timerId );

    if( timer != nullptr )
    {
        timer->stop();
        g_timerCache->remove( timerId );
        delete timer;
    }

    return KJSUndefined();
}


void JSApp::initType( KJSContext *ctx )
{
    static bool initialized = false;
    if ( initialized )
        return;
    initialized = true;

    g_appProto = new KJSPrototype();

    g_appProto->defineProperty( ctx, QStringLiteral("formsVersion"), appGetFormsVersion );
    g_appProto->defineProperty( ctx, QStringLiteral("language"), appGetLanguage );
    g_appProto->defineProperty( ctx, QStringLiteral("numPlugIns"), appGetNumPlugins );
    g_appProto->defineProperty( ctx, QStringLiteral("platform"), appGetPlatform );
    g_appProto->defineProperty( ctx, QStringLiteral("plugIns"), appGetPlugIns );
    g_appProto->defineProperty( ctx, QStringLiteral("printColorProfiles"), appGetPrintColorProfiles );
    g_appProto->defineProperty( ctx, QStringLiteral("printerNames"), appGetPrinterNames );
    g_appProto->defineProperty( ctx, QStringLiteral("viewerType"), appGetViewerType );
    g_appProto->defineProperty( ctx, QStringLiteral("viewerVariation"), appGetViewerVariation );
    g_appProto->defineProperty( ctx, QStringLiteral("viewerVersion"), appGetViewerVersion );

    g_appProto->defineFunction( ctx, QStringLiteral("alert"), appAlert );
    g_appProto->defineFunction( ctx, QStringLiteral("beep"), appBeep );
    g_appProto->defineFunction( ctx, QStringLiteral("getNthPlugInName"), appGetNthPlugInName );
    g_appProto->defineFunction( ctx, QStringLiteral("goBack"), appGoBack );
    g_appProto->defineFunction( ctx, QStringLiteral("goForward"), appGoForward );
    g_appProto->defineFunction( ctx, QStringLiteral("setInterval"), appSetInterval );
    g_appProto->defineFunction( ctx, QStringLiteral("clearInterval"), appClearInterval );
    g_appProto->defineFunction( ctx, QStringLiteral("setTimeOut"), appSetTimeOut );
    g_appProto->defineFunction( ctx, QStringLiteral("clearTimeOut"), appClearTimeOut );
}

KJSObject JSApp::object( KJSContext *ctx, DocumentPrivate *doc )
{
    return g_appProto->constructObject( ctx, doc );
}

KJSObject JSApp::wrapTimer( KJSContext *ctx, QTimer *timer)
{
    KJSObject timerObject = g_appProto->constructObject( ctx, timer );
    timerObject.setProperty( ctx, OKULAR_TIMERID, timer->timerId() );

    g_timerCache->insert( timer->timerId(), timer );

    return timerObject;
}

void JSApp::clearCachedFields()
{
    if ( g_timerCache )
    {
        qDeleteAll( g_timerCache->begin(), g_timerCache->end() );
        g_timerCache->clear();
    }
}
