#include <stdio.h>
#include <stdlib.h>
#include <stdarg.h>
#include <string.h>

#include "SDL.h"
#include "SDL_mixer.h"

Mix_Chunk* blaster = NULL;
Mix_Chunk* r2 = NULL;
Mix_Chunk* sabre = NULL;
Mix_Music* music = NULL;

int bChannel = -1;
int rChannel = -1;
int sChannel = -1;

SDL_Event event;

int volume = SDL_MIX_MAXVOLUME;
int track_number = 1;
int done = 0;

void handleKey(SDL_KeyboardEvent key);
void musicDone();

int main(int argc, char *argv[]) {
	
	SDL_Surface *screen;

	
	//setup parameters
	int audio_rate = 44100, audio_channels = 2, audio_buffers = 4096, bits = 0;
	Uint16 audio_format = AUDIO_S16;
	
	//initializing sound and calling Mix_OpenAudio
	if(SDL_Init(SDL_INIT_AUDIO|SDL_INIT_VIDEO)<0){
		printf("Unable to init sound or video!\n");
		exit(1);
	}
	if(Mix_OpenAudio(audio_rate, audio_format, audio_channels, audio_buffers)){
		printf("Unable to open audio!\n");
		exit(1);
	}
	
	// Print some info
	Mix_QuerySpec(&audio_rate, &audio_format, &audio_channels);
	bits=audio_format&0xFF;
	printf("Opened audio at %d Hz %d bit %s, %d bytes audio buffer\n", audio_rate,
		bits, audio_channels > 1 ? "stereo" : "mono", audio_buffers );
	
	// Pre-load sound effects
	blaster = Mix_LoadWAV("blaster.wav");
	r2 = Mix_LoadWAV("artoo.wav");
	sabre = Mix_LoadWAV("sabre_on.wav");
	
	Mix_VolumeMusic(volume);
	
	//screen buildup
	screen = SDL_SetVideoMode(320, 240, 0, 0);
	
	while(!done) {
		//possible extension to looping with: if(Mix_PlayMusic(music, 1)==-1){}
		while(SDL_PollEvent(&event)) {
			switch(event.type){
			case SDL_QUIT:
				done = 1;
				break;
			case SDL_KEYDOWN:
			case SDL_KEYUP:
				handleKey(event.key);
				break;
			default:	
				break;
			}
		}
		SDL_Delay(50);
	}
	Mix_CloseAudio();
	SDL_Quit();
	return 0;
}

void handleKey(SDL_KeyboardEvent key) {
	switch(event.key.keysym.sym){
	case SDLK_ESCAPE:
		done = 1;
		break;
	case SDLK_q:	
		done = 1;
		break;
	case SDLK_LEFT:
		Mix_RewindMusic();
		break;
	case SDLK_RIGHT:
		switch(Mix_GetMusicType(NULL)){
		case MUS_MP3:
			Mix_SetMusicPosition(+5);
			break;
		default:
			printf("no forwarding with this type of music.\n");
			break;
		}
		break;
	case SDLK_UP:
		volume = (volume + 1) << 1;
		if(volume > SDL_MIX_MAXVOLUME)
			volume = SDL_MIX_MAXVOLUME;
		Mix_VolumeMusic(volume);
		break;
	case SDLK_DOWN:
		volume >>= 1;
		Mix_VolumeMusic(volume);
		break;
	case SDLK_SPACE:
		if(Mix_PausedMusic())
			Mix_ResumeMusic();
		else
			Mix_PauseMusic();
		break;
	case SDLK_r:
		if(event.key.type == SDL_KEYDOWN) {
			if(rChannel < 0) {
				rChannel = Mix_PlayChannel(-1, r2, -1);
			}
		} else {
			Mix_HaltChannel(rChannel);
			rChannel = -1;
		}
		break;
	case SDLK_b:
		if(event.key.type == SDL_KEYDOWN) {
			if(bChannel < 0) {
				bChannel = Mix_PlayChannel(-1, blaster, -1);
			}
		} else {
			Mix_HaltChannel(bChannel);
			bChannel = -1;
		}
		break;
	case SDLK_s:
		if(event.key.type == SDL_KEYDOWN) {
			if(sChannel < 0) {
				sChannel = Mix_PlayChannel(-1, sabre, -1);
			}
		} else {
			Mix_HaltChannel(bChannel);
			sChannel = -1;
		}
		break;
	case SDLK_m:
		if(event.key.state == SDL_PRESSED) {
			if(music == NULL) { 
				switch (track_number){
				case 1:
					music = Mix_LoadMUS("luke_grey_orxonox1.ogg");
					Mix_PlayMusic(music, 0);
					Mix_HookMusicFinished(musicDone);
					track_number++;
					break;
				case 2:
					music = Mix_LoadMUS("luke_grey_orxonox2.ogg");
					Mix_PlayMusic(music, 0);
					Mix_HookMusicFinished(musicDone);
					track_number++;
					break;
				case 3:
					music = Mix_LoadMUS("luke_grey_orxonox3.ogg");
					Mix_PlayMusic(music, 0);
					Mix_HookMusicFinished(musicDone);
					track_number++;
					break;
				case 4:
					music = Mix_LoadMUS("luke_grey_and aquarius_orxonox.ogg");
					Mix_PlayMusic(music, 0);
					Mix_HookMusicFinished(musicDone);
					track_number++;
					break;
				case 5:
					music = Mix_LoadMUS("nomenes_orxonox.ogg");
					Mix_PlayMusic(music, 0);
					Mix_HookMusicFinished(musicDone);
					track_number = 1;
					break;
				}
			} else {
				Mix_HaltMusic();
				Mix_FreeMusic(music);
				music = NULL;
			}
		}
		break;
	default:
		break;
	}
}

void musicDone() {
	Mix_HaltMusic();
	Mix_FreeMusic(music);
	music = NULL;
}