/***************************************************************************
  Copyright (C) 2008 Walter van Niftrik


 This program may be modified and copied freely according to the terms of
 the GNU general public license (GPL), as long as the above copyright
 notice and the licensing information contained herein are preserved.

 Please refer to www.gnu.org for licensing details.

 This work is provided AS IS, without warranty of any kind, expressed or
 implied, including but not limited to the warranties of merchantability,
 noninfringement, and fitness for a specific purpose. The author will not
 be held liable for any damage caused by this work or derivatives of it.

 By using this source code, you agree to the licensing terms as stated
 above.


 Please contact the maintainer for bug reports or inquiries.

 Current Maintainer:

    Walter van Niftrik <w.f.b.w.v.niftrik@stud.tue.nl>

***************************************************************************/

extern "C" {
#include "../softseq.h"
#include "../sequencer.h"
#include "../device.h"
#include "resource.h"
#include "sci_memory.h"
}

#include "mt32/mt32emu.h"

/* FIXME */
#define FREESCI_GAMEDIR ".freesci"

#define SAMPLE_RATE 32000
#define CHANNELS SFX_PCM_STEREO_LR
#define STEREO 1

static MT32Emu::Synth *synth;
static sfx_sequencer_t *mt32seq;
static int initializing;

/* MIDI writer */

static int
mt32_midi_init(struct _midi_writer *self)
{
	return SFX_OK;
}

static int
mt32_midi_set_option(struct _midi_writer *self, char *name, char *value)
{
	return SFX_ERROR;
}

static int
mt32_midi_write(struct _midi_writer *self, unsigned char *buf, int len)
{
	if (buf[0] == 0xf0)
		synth->playSysex(buf, len);
	else if (len < 4) {
		MT32Emu::Bit32u msg;
		msg = buf[0];
		if (len > 0)
			msg |= buf[1] << 8;
		if (len > 1)
			msg |= buf[2] << 16;
		synth->playMsg(msg);
	}
	else
		sciprintf("MT32EMU: Skipping non-sysex message of more than 3 bytes.\n");

	return SFX_OK;
}

static void
mt32_midi_delay(struct _midi_writer *self, int ticks)
{
}

static void
mt32_midi_reset_timer(struct _midi_writer *self)
{
}

static void
mt32_midi_close(struct _midi_writer *self)
{
}

static midi_writer_t midi_writer_mt32 = {
	"mt32",
	mt32_midi_init,
	mt32_midi_set_option,
	mt32_midi_write,
	mt32_midi_delay,
	NULL,
	mt32_midi_reset_timer,
	mt32_midi_close
};

/* Software sequencer */

static void printDebug(void *userData, const char *fmt, va_list list)
{
	if (initializing) {
		vprintf(fmt, list);
		printf("\n");
	}
}

static void
mt32_poll(sfx_softseq_t *self, byte *dest, int count)
{
	synth->render((MT32Emu::Bit16s *) dest, count);
}

static int
mt32_init(sfx_softseq_t *self, byte *data_ptr, int data_length, byte *data2_ptr,
	  int data2_length)
{
	MT32Emu::SynthProperties prop;
	char *home = sci_get_homedir();
	char *romdir;

	if (!home) {
		sciprintf("MT32EMU: Couldn't determine home directory.\n");
		return SFX_ERROR;
	}

	romdir = (char *) sci_malloc(sizeof(home) + 2 * sizeof(G_DIR_SEPARATOR_S)
		 + sizeof(FREESCI_GAMEDIR) + 1);

	strcpy(romdir, home);
	strcat(romdir, G_DIR_SEPARATOR_S);
	strcat(romdir, FREESCI_GAMEDIR);
	strcat(romdir, G_DIR_SEPARATOR_S);

	mt32seq = sfx_find_sequencer("MT32");
	if (!mt32seq) {
		sciprintf("MT32EMU: Unable to find MT32 sequencer.\n");
		return SFX_ERROR;
	}

	prop.sampleRate = SAMPLE_RATE;
	prop.useReverb = true;
	prop.useDefaultReverb = true;
	prop.baseDir = romdir;
	prop.userData = NULL;
	prop.report = NULL;
	prop.printDebug = printDebug;
	prop.openFile = NULL;
	prop.closeFile = NULL;

	initializing = 1;
	synth = new MT32Emu::Synth();
	if (!synth->open(prop))
		return SFX_ERROR;
	initializing = 0;

	mt32seq->open(data_length, data_ptr, data2_length, data2_ptr,
		      &midi_writer_mt32);

	free(romdir);

	return SFX_OK;
}

static void
mt32_exit(sfx_softseq_t *self)
{
	synth->close();
	delete synth;

	mt32seq->close();
}

static void
mt32_allstop(sfx_softseq_t *self)
{
	if (mt32seq->allstop)
		mt32seq->allstop();
}

static void
mt32_volume(sfx_softseq_t *self, int volume)
{
	if (mt32seq->volume)
		mt32seq->volume(volume / 2); /* High volume causes clipping. */
}

static int
mt32_set_option(sfx_softseq_t *self, char *name, char *value)
{
	return SFX_ERROR;
}

static void
mt32_event(sfx_softseq_t *self, byte cmd, int argc, byte *argv)
{
	mt32seq->event(cmd, argc, argv);
}

sfx_softseq_t sfx_softseq_mt32 = {
	"mt32emu",
	"0.1",
	mt32_set_option,
	mt32_init,
	mt32_exit,
	mt32_volume,
	mt32_event,
	mt32_poll,
	mt32_allstop,
	NULL,
	001,	/* patch.001 */
	SFX_SEQ_PATCHFILE_NONE,
	0x01,	/* playflag */
	1,	/* do play channel 9 */
	32, /* Max polypgony */
	{SAMPLE_RATE, CHANNELS, SFX_PCM_FORMAT_S16_NATIVE}
};