/*

 * Hedgewars, a free turn based strategy game

 * Copyright (c) 2004-2015 Andrey Korotaev <unC0Rr@gmail.com>

 *

 * 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; version 2 of the License

 *

 * 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., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA

 */

/**

 * @file

 * @brief SDLInteraction class implementation

 */

#include "SDL.h"

#include "SDL_mixer.h"

#include "HWApplication.h"

#include "hwform.h" /* you know, we could just put a config singleton lookup function in gameuiconfig or something... */

#include "gameuiconfig.h"

#include "SDLInteraction.h"

#include "physfsrwops.h"

SDLInteraction & SDLInteraction::instance()

{

    static SDLInteraction instance;

    return instance;

}

SDLInteraction::SDLInteraction()

{

    SDL_Init(SDL_INIT_VIDEO | SDL_INIT_JOYSTICK);

    m_audioInitialized = false;

    m_music = NULL;

    m_musicTrack = "";

    m_isPlayingMusic = false;

    lastchannel = 0;

    if(SDL_NumJoysticks())

        addGameControllerKeys();

    SDL_QuitSubSystem(SDL_INIT_JOYSTICK);

    m_soundMap = new QMap<QString,Mix_Chunk*>();

}

SDLInteraction::~SDLInteraction()

{

    stopMusic();

    if (m_audioInitialized)

    {

        if (m_music != NULL)

        {

            Mix_HaltMusic();

            Mix_FreeMusic(m_music);

        }

        Mix_CloseAudio();

    }

    SDL_Quit();

    delete m_soundMap;

}

QStringList SDLInteraction::getResolutions() const

{

    QStringList result;

    int modesNumber = SDL_GetNumDisplayModes(0);

    SDL_DisplayMode mode;

    for(int i = 0; i < modesNumber; ++i)

    {

        SDL_GetDisplayMode(0, i, &mode);

        if ((mode.w >= 640) && (mode.h >= 480))

            result << QString("%1x%2").arg(mode.w).arg(mode.h);

    }

    return result;

}

void SDLInteraction::addGameControllerKeys() const

{

    QStringList result;

#if SDL_VERSION_ATLEAST(2, 0, 0)

    int i = 0;

    while(i < 1024 && sdlkeys[i][1][0] != '\0')

        i++;

    // Iterate through all game controllers

    qDebug("Detecting controllers ...");

    for(int jid = 0; jid < SDL_NumJoysticks(); jid++)

    {

        SDL_Joystick* joy = SDL_JoystickOpen(jid);

        // Retrieve the game controller's name

        QString joyname = QString(SDL_JoystickNameForIndex(jid));

        // Strip "Controller (...)" that's added by some drivers (English only)

        joyname.replace(QRegExp("^Controller \\((.*)\\)$"), "\\1");

        qDebug("- Controller no. %d: %s", jid, qPrintable(joyname));

        // Connected Xbox 360 controller? Use specific button names then

        // Might be interesting to add 'named' buttons for the most often used gamepads

        bool isxb = joyname.contains("Xbox 360");

        // This part of the string won't change for multiple keys/hats, so keep it

        QString prefix = QString("%1 (%2): ").arg(joyname).arg(jid + 1);

        // Register entries for missing axes not assigned to sticks of this joystick/gamepad

        for(int aid = 0; aid < SDL_JoystickNumAxes(joy) && i < 1021; aid++)

        {

            // Entry for "Axis Up"

            sprintf(sdlkeys[i][0], "j%da%du", jid, aid);

            // Entry for "Axis Down"

            sprintf(sdlkeys[i][0], "j%da%dd", jid, aid);

        }

        // Register entries for all coolie hats of this joystick/gamepad

        for(int hid = 0; hid < SDL_JoystickNumHats(joy) && i < 1019; hid++)

        {

            // Again store the part of the string not changing for multiple uses

            // Entry for "Hat Up"

            sprintf(sdlkeys[i][0], "j%dh%du", jid, hid);

            // Entry for "Hat Down"

            sprintf(sdlkeys[i][0], "j%dh%dd", jid, hid);

            // Entry for "Hat Left"

            sprintf(sdlkeys[i][0], "j%dh%dl", jid, hid);

            // Entry for "Hat Right"

            sprintf(sdlkeys[i][0], "j%dh%dr", jid, hid);

        }

        // Register entries for all buttons of this joystick/gamepad

        for(int bid = 0; bid < SDL_JoystickNumButtons(joy) && i < 1022; bid++)

        {

            // Buttons

            sprintf(sdlkeys[i][0], "j%db%d", jid, bid);

        }

        // Close the game controller as we no longer need it

        SDL_JoystickClose(joy);

    }

    if(i >= 1024)

        i = 1023;

    // Terminate the list

    sdlkeys[i][0][0] = '\0';

    sdlkeys[i][1][0] = '\0';   

#endif

}

void SDLInteraction::SDLAudioInit()

{

    // don't init again

    if (m_audioInitialized)

        return;

    SDL_Init(SDL_INIT_AUDIO);

    if(!Mix_OpenAudio(44100, MIX_DEFAULT_FORMAT, 2, 1024)) /* should we keep trying, or just turn off permanently? */

        m_audioInitialized = true;

}

void SDLInteraction::playSoundFile(const QString & soundFile)

{

    if (!HWForm::config || !HWForm::config->isFrontendSoundEnabled()) return;

    SDLAudioInit();

    if (!m_audioInitialized) return;

    if (!m_soundMap->contains(soundFile))

        m_soundMap->insert(soundFile, Mix_LoadWAV_RW(PHYSFSRWOPS_openRead(soundFile.toLocal8Bit().constData()), 1));

    //FIXME: this is a hack, but works as long as we have few concurrent playing sounds

    if (Mix_Playing(lastchannel) == false)

        lastchannel = Mix_PlayChannel(-1, m_soundMap->value(soundFile), 0);

}

void SDLInteraction::setMusicTrack(const QString & musicFile)

{

    bool wasPlayingMusic = m_isPlayingMusic;

    stopMusic();

    if (m_music != NULL)

    {

        Mix_FreeMusic(m_music);

        m_music = NULL;

    }

    m_musicTrack = musicFile;

    if (wasPlayingMusic)

        startMusic();

}

void SDLInteraction::startMusic()

{

    if (m_isPlayingMusic)

        return;

    m_isPlayingMusic = true;

    if (m_musicTrack.isEmpty())

        return;

    SDLAudioInit();

    if (!m_audioInitialized) return;

    if (m_music == NULL)

        m_music = Mix_LoadMUS_RW(PHYSFSRWOPS_openRead(m_musicTrack.toLocal8Bit().constData()), 0);

    Mix_VolumeMusic(MIX_MAX_VOLUME/4);

    Mix_FadeInMusic(m_music, -1, 1750);

}

void SDLInteraction::stopMusic()

{

    if (m_isPlayingMusic && (m_music != NULL))

    {

        // fade out music to finish 0,5 seconds from now

        while(!Mix_FadeOutMusic(1000) && Mix_PlayingMusic())

        {

            SDL_Delay(100);

        }

    }

    m_isPlayingMusic = false;

}

QSize SDLInteraction::getCurrentResolution()

{

    SDL_DisplayMode mode;

    SDL_GetDesktopDisplayMode(0, &mode);

    return QSize(mode.w, mode.h);

}