/*
 * Copyright (c) 1997 - 2001 Hansjörg Malthaner
 *
 * This file is part of the Simutrans project under the artistic licence.
 */

#include <allegro.h>
#include <stdio.h>
#include "music.h"

static int midi_number = -1;

MIDI *midi_samples[MAX_MIDI];


/**
 * nothing to do here
 */
bool dr_init_midi(void)
{
	return true;
}


/**
 * sets midi playback volume
 * @author Hj. Malthaner
 */
void dr_set_midi_volume(int vol)
{
	set_volume(-1, vol);
}


/**
 * Loads a MIDI file
 * @author Owen Rudge, changes by Hj. Malthaner
 */
int dr_load_midi(const char *filename)
{
	if (midi_number < MAX_MIDI - 1) {
		const int i = midi_number + 1;

		if(i >= 0 && i < MAX_MIDI) {
			midi_samples[i] = load_midi(filename);

			if(midi_samples[i]) {
				midi_number = i;
			}
		}
	}
	return midi_number;
}


/**
 * Plays a MIDI file
 * Key: The index of the MIDI file to be played
 * By Owen Rudge
 */
void dr_play_midi(int key)
{
	if (midi_number > 0) {
		if (key >= 0 && key <= midi_number && midi_samples[key] != NULL) {
			play_midi(midi_samples[key], false);
		}
		else {
			printf("\nMessage: MIDI: Unable to play MIDI %d\n", key);
		}
	}
}


/**
 * Stops playing MIDI file
 * By Owen Rudge
 */
void dr_stop_midi(void)
{
	stop_midi();
}


/**
 * Returns the midi_pos variable
 * By Owen Rudge
 */
sint32 dr_midi_pos(void)
{
	return midi_pos < 0 ? -1 : 0;
}


/**
 * Midi shutdown/cleanup
 * By Owen Rudge
 */
void dr_destroy_midi(void)
{
	int i;

	for (i = 0; i <= midi_number; i++) {
		if (midi_samples[i] != NULL) {
			destroy_midi(midi_samples[i]);
		}
	}
	midi_number = -1;
}
