/*
Copyright (C) 2003-2004 Ryan C. Gordon. and James Bentler

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., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.

Originally written by Ryan C. Gordon. (icculus@clutteredmind.org)
Adapted to work with JonoF's port by James Bentler (bentler@cs.umn.edu)

*/
/*
 * A reimplementation of Jim Dose's FX_MAN routines, using  SDL_mixer 1.2.
 *   Whee. FX_MAN is also known as the "Apogee Sound System", or "ASS" for
 *   short. How strangely appropriate that seems.
 */

#include <stdio.h>
#include <stdlib.h>
#include <stdarg.h>
#include <string.h>
#include <assert.h>
#include <dirent.h>
#include <errno.h>

#include "duke3d.h"
#include "cache1d.h"

#if (!defined __WATCOMC__)
#define cdecl
#endif

// for SDL_mixer.h _RW functions
#define USE_RWOPS

#include <SDL.h>
#include <SDL_mixer.h>
#include "music.h"

#define __FX_TRUE  (1 == 1)
#define __FX_FALSE (!__FX_TRUE)

#define DUKESND_DEBUG       "DUKESND_DEBUG"

#ifndef min
#define min(a, b)  (((a) < (b)) ? (a) : (b))
#endif

#ifndef max
#define max(a, b)  (((a) > (b)) ? (a) : (b))
#endif

int MUSIC_ErrorCode = MUSIC_Ok;

static char warningMessage[80];
static char errorMessage[80];
static FILE *debug_file = NULL;
static int initialized_debugging = 0;
static int external_midi = 0;

static int music_initialized = 0;
static int music_context = 0;
static int music_loopflag = MUSIC_PlayOnce;
static Mix_Music *music_musicchunk = NULL;
static char *music_songdata = NULL;

// This gets called all over the place for information and debugging messages.
//  If the user set the DUKESND_DEBUG environment variable, the messages
//  go to the file that is specified in that variable. Otherwise, they
//  are ignored for the expense of the function call. If DUKESND_DEBUG is
//  set to "-" (without the quotes), then the output goes to stdout.
static void musdebug(const char *fmt, ...)
{
    va_list ap;

    if (debug_file)
    {
        fprintf(debug_file, "DUKEMUS: ");
        va_start(ap, fmt);
        vfprintf(debug_file, fmt, ap);
        va_end(ap);
        fprintf(debug_file, "\n");
        fflush(debug_file);
    } // if
} // musdebug

static void init_debugging(void)
{
    const char *envr;

    if (initialized_debugging)
        return;

    envr = getenv(DUKESND_DEBUG);
    if (envr != NULL)
    {
        if (Bstrcmp(envr, "-") == 0)
            debug_file = stdout;
        else
            debug_file = fopen(envr, "w");

        if (debug_file == NULL)
            fprintf(stderr, "DUKESND: -WARNING- Could not open debug file!\n");
        else
            setbuf(debug_file, NULL);
    } // if

    initialized_debugging = 1;
} // init_debugging

static void setErrorMessage(const char *msg)
{
    Bstrncpy(errorMessage, msg, sizeof(errorMessage));
    // strncpy() doesn't add the null char if there isn't room...
    errorMessage[sizeof(errorMessage) - 1] = '\0';
    musdebug("Error message set to [%s].", errorMessage);
} // setErrorMessage

// The music functions...

char *MUSIC_ErrorString(int ErrorNumber)
{
    switch (ErrorNumber)
    {
    case MUSIC_Warning:
        return(warningMessage);

    case MUSIC_Error:
        return(errorMessage);

    case MUSIC_Ok:
        return("OK; no error.");

    case MUSIC_ASSVersion:
        return("Incorrect sound library version.");

    case MUSIC_SoundCardError:
        return("General sound card error.");

    case MUSIC_InvalidCard:
        return("Invalid sound card.");

    case MUSIC_MidiError:
        return("MIDI error.");

    case MUSIC_MPU401Error:
        return("MPU401 error.");

    case MUSIC_TaskManError:
        return("Task Manager error.");

        //case MUSIC_FMNotDetected:
        //    return("FM not detected error.");

    case MUSIC_DPMI_Error:
        return("DPMI error.");

    default:
        return("Unknown error.");
    } // switch

    assert(0);    // shouldn't hit this point.
    return(NULL);
} // MUSIC_ErrorString

int MUSIC_Init(int SoundCard, int Address)
{
    // Use an external MIDI player if the user has specified to do so
    char *command = getenv("EDUKE32_MUSIC_CMD");
    external_midi = (command != NULL && command[0] != 0);
    if(external_midi)
        Mix_SetMusicCMD(command);

    init_debugging();

    musdebug("INIT! card=>%d, address=>%d...", SoundCard, Address);

    if (music_initialized)
    {
        setErrorMessage("Music system is already initialized.");
        return(MUSIC_Error);
    } // if

    SoundCard = 1;

    music_initialized = 1;
    return(MUSIC_Ok);
} // MUSIC_Init


int MUSIC_Shutdown(void)
{
    musdebug("shutting down sound subsystem.");

    // TODO - make sure this is being called from the menu -- SA
    if(external_midi)
        Mix_SetMusicCMD(NULL);

    MUSIC_StopSong();
    music_context = 0;
    music_initialized = 0;
    music_loopflag = MUSIC_PlayOnce;

    return(MUSIC_Ok);
} // MUSIC_Shutdown


void MUSIC_SetMaxFMMidiChannel(int channel)
{
    musdebug("STUB ... MUSIC_SetMaxFMMidiChannel(%d).\n", channel);
} // MUSIC_SetMaxFMMidiChannel


void MUSIC_SetVolume(int volume)
{
    volume = max(0, volume);
    volume = min(volume, 255);

    Mix_VolumeMusic(volume >> 1);  // convert 0-255 to 0-128.
} // MUSIC_SetVolume


void MUSIC_SetMidiChannelVolume(int channel, int volume)
{
    musdebug("STUB ... MUSIC_SetMidiChannelVolume(%d, %d).\n", channel, volume);
} // MUSIC_SetMidiChannelVolume


void MUSIC_ResetMidiChannelVolumes(void)
{
    musdebug("STUB ... MUSIC_ResetMidiChannelVolumes().\n");
} // MUSIC_ResetMidiChannelVolumes


int MUSIC_GetVolume(void)
{
    return(Mix_VolumeMusic(-1) << 1);  // convert 0-128 to 0-255.
} // MUSIC_GetVolume


void MUSIC_SetLoopFlag(int loopflag)
{
    music_loopflag = loopflag;
} // MUSIC_SetLoopFlag


int MUSIC_SongPlaying(void)
{
    return((Mix_PlayingMusic()) ? __FX_TRUE : __FX_FALSE);
} // MUSIC_SongPlaying


void MUSIC_Continue(void)
{
    if (Mix_PausedMusic())
        Mix_ResumeMusic();
} // MUSIC_Continue


void MUSIC_Pause(void)
{
    Mix_PauseMusic();
} // MUSIC_Pause


int MUSIC_StopSong(void)
{
    //if (!fx_initialized)
    if (!Mix_QuerySpec(NULL, NULL, NULL))
    {
        setErrorMessage("Need FX system initialized, too. Sorry.");
        return(MUSIC_Error);
    } // if

    if ((Mix_PlayingMusic()) || (Mix_PausedMusic()))
        Mix_HaltMusic();

    if (music_musicchunk)
        Mix_FreeMusic(music_musicchunk);
    if (music_songdata)
        Bfree (music_songdata);

    music_musicchunk = NULL;
    music_songdata = NULL;

    return(MUSIC_Ok);
} // MUSIC_StopSong

// Duke3D-specific.  --ryan.
void PlayMusic(char *_filename)
{
    int handle;
    int size;
    int rc;

    MUSIC_StopSong();

    handle = kopen4load(_filename, 0);
    if (handle == -1)
        return;

    size = kfilelength(handle);
    if (size == -1)
    {
        kclose(handle);
        return;
    } // if

    music_songdata = Bcalloc(size,sizeof(char));
    if (music_songdata == NULL)
    {
        kclose(handle);
        return;
    } // if

    rc = kread(handle, music_songdata, size);
    kclose(handle);
    if (rc != size)
    {
        Bfree(music_songdata);
        music_songdata = NULL;
        return;
    } // if

    music_musicchunk = Mix_LoadMUS_RW(SDL_RWFromMem((char *) music_songdata, size));

    if (music_musicchunk != NULL)
    {
        // !!! FIXME: I set the music to loop. Hope that's okay. --ryan.
        Musicsize = size;
        Mix_PlayMusic(music_musicchunk, -1);
    } // if
}


void MUSIC_SetContext(int context)
{
    musdebug("STUB ... MUSIC_SetContext().\n");
    music_context = context;
} // MUSIC_SetContext


int MUSIC_GetContext(void)
{
    return(music_context);
} // MUSIC_GetContext


void MUSIC_SetSongTick(unsigned int PositionInTicks)
{
    UNREFERENCED_PARAMETER(PositionInTicks);
    musdebug("STUB ... MUSIC_SetSongTick().\n");
} // MUSIC_SetSongTick


void MUSIC_SetSongTime(unsigned int milliseconds)
{
    UNREFERENCED_PARAMETER(milliseconds);
    musdebug("STUB ... MUSIC_SetSongTime().\n");
}// MUSIC_SetSongTime


void MUSIC_SetSongPosition(int measure, int beat, int tick)
{
    UNREFERENCED_PARAMETER(measure);
    UNREFERENCED_PARAMETER(beat);
    UNREFERENCED_PARAMETER(tick);
    musdebug("STUB ... MUSIC_SetSongPosition().\n");
} // MUSIC_SetSongPosition


void MUSIC_GetSongPosition(songposition *pos)
{
    UNREFERENCED_PARAMETER(pos);
    musdebug("STUB ... MUSIC_GetSongPosition().\n");
} // MUSIC_GetSongPosition


void MUSIC_GetSongLength(songposition *pos)
{
    UNREFERENCED_PARAMETER(pos);
    musdebug("STUB ... MUSIC_GetSongLength().\n");
} // MUSIC_GetSongLength


int MUSIC_FadeVolume(int tovolume, int milliseconds)
{
    UNREFERENCED_PARAMETER(tovolume);
    Mix_FadeOutMusic(milliseconds);
    return(MUSIC_Ok);
} // MUSIC_FadeVolume


int MUSIC_FadeActive(void)
{
    return((Mix_FadingMusic() == MIX_FADING_OUT) ? __FX_TRUE : __FX_FALSE);
} // MUSIC_FadeActive


void MUSIC_StopFade(void)
{
    musdebug("STUB ... MUSIC_StopFade().\n");
} // MUSIC_StopFade


void MUSIC_RerouteMidiChannel(int channel, int cdecl(*function)(int event, int c1, int c2))
{
    UNREFERENCED_PARAMETER(channel);
    UNREFERENCED_PARAMETER(function);
    musdebug("STUB ... MUSIC_RerouteMidiChannel().\n");
} // MUSIC_RerouteMidiChannel


void MUSIC_RegisterTimbreBank(unsigned char *timbres)
{
    UNREFERENCED_PARAMETER(timbres);
    musdebug("STUB ... MUSIC_RegisterTimbreBank().\n");
} // MUSIC_RegisterTimbreBank


void MUSIC_Update(void)
{}