//
//  DumbFile.m
//  Cog
//
//  Created by Vincent Spader on 5/29/06.
//  Copyright 2006 Vincent Spader. All rights reserved.
//

#define _USE_SSE 1

#import "DumbDecoder.h"

#import "j2b.h"
#import "mo3.h"
#import "umx.h"

#import "Logging.h"

#import "PlaylistController.h"

@implementation DumbDecoder

struct MEMANDFREEFILE {
	char *ptr, *ptr_begin;
	long left, size;
	int is_mo3;
};

static int dumb_maffile_skip(void *f, long n) {
	struct MEMANDFREEFILE *m = f;
	if(n > m->left) return -1;
	m->ptr += n;
	m->left -= n;
	return 0;
}

static int dumb_maffile_getc(void *f) {
	struct MEMANDFREEFILE *m = f;
	if(m->left <= 0) return -1;
	m->left--;
	return *(const unsigned char *)m->ptr++;
}

static long dumb_maffile_getnc(char *ptr, long n, void *f) {
	struct MEMANDFREEFILE *m = f;
	if(n > m->left) n = m->left;
	memcpy(ptr, m->ptr, n);
	m->ptr += n;
	m->left -= n;
	return n;
}

static void dumb_maffile_close(void *f) {
	struct MEMANDFREEFILE *m = f;
	if(m->is_mo3)
		freeMo3(m->ptr_begin);
	else
		free(m->ptr_begin);
	free(f);
}

static int dumb_maffile_seek(void *f, long n) {
	struct MEMANDFREEFILE *m = f;

	m->ptr = m->ptr_begin + n;
	m->left = m->size - n;

	return 0;
}

static long dumb_maffile_get_size(void *f) {
	struct MEMANDFREEFILE *m = f;
	return m->size;
}

static const DUMBFILE_SYSTEM maffile_dfs = {
	NULL,
	&dumb_maffile_skip,
	&dumb_maffile_getc,
	&dumb_maffile_getnc,
	&dumb_maffile_close,
	&dumb_maffile_seek,
	&dumb_maffile_get_size
};

DUMBFILE *dumbfile_open_memory_and_free(char *data, long size) {
	int is_mo3 = 0;
	char *try_data = unpackMo3(data, &size);
	if(try_data) {
		free(data);
		data = try_data;
		is_mo3 = 1;
	} else {
		try_data = unpackUmx(data, &size);
		if(try_data) {
			free(data);
			data = try_data;
		} else {
			try_data = unpackJ2b(data, &size);
			if(try_data) {
				free(data);
				data = try_data;
			}
		}
	}

	struct MEMANDFREEFILE *m = malloc(sizeof(*m));
	if(!m) return NULL;

	m->ptr_begin = data;
	m->ptr = data;
	m->left = size;
	m->size = size;
	m->is_mo3 = is_mo3;

	return dumbfile_open_ex(m, &maffile_dfs);
}

+ (void)initialize {
	if(self == [DumbDecoder class]) {
		// do this here so we don't have to wait on it later
		_dumb_init_cubic();
		_dumb_init_sse();
	}
}

- (id)init {
	self = [super init];
	if(self) {
		sampptr = NULL;
		dsr = NULL;
		duh = NULL;
	}
	return self;
}

int callbackLoop(void *data) {
	long *loops = (long *)data;
	++*loops;
	return 0;
}

- (BOOL)open:(id<CogSource>)s {
	[self setSource:s];

	[source seek:0 whence:SEEK_END];
	long size = [source tell];
	[source seek:0 whence:SEEK_SET];

	void *data = malloc(size);
	[source read:data amount:size];

	DUMBFILE *df = dumbfile_open_memory_and_free(data, size);
	if(!df) {
		ALog(@"Open failed for file: %@", [[s url] absoluteString]);
		return NO;
	}

	int subsong = 0;
	int startOrder = 0;

	NSURL *url = [s url];
	int track_num;
	if([[url fragment] length] == 0)
		track_num = 0;
	else
		track_num = [[url fragment] intValue];

	if(dumb_get_psm_subsong_count(df))
		subsong = track_num;
	else
		startOrder = track_num;

	dumbfile_seek(df, 0, SEEK_SET);

	NSString *ext = [[[s url] pathExtension] lowercaseString];
	duh = dumb_read_any(df, [ext isEqualToString:@"mod"] ? 0 : 1, subsong);
	if(!duh) {
		ALog(@"Failed to create duh");
		dumbfile_close(df);
		return NO;
	}
	dumbfile_close(df);

	length = dumb_it_build_checkpoints(duh_get_it_sigdata(duh), startOrder);

	dsr = duh_start_sigrenderer(duh, 0, 2 /* stereo */, startOrder);
	if(!dsr) {
		ALog(@"Failed to create dsr");
		return NO;
	}

	DUMB_IT_SIGRENDERER *itsr = duh_get_it_sigrenderer(dsr);

	int resampling_int = -1;
	NSString *resampling = [[NSUserDefaults standardUserDefaults] stringForKey:@"resampling"];
	if([resampling isEqualToString:@"zoh"])
		resampling_int = 0;
	else if([resampling isEqualToString:@"blep"])
		resampling_int = 1;
	else if([resampling isEqualToString:@"linear"])
		resampling_int = 2;
	else if([resampling isEqualToString:@"blam"])
		resampling_int = 3;
	else if([resampling isEqualToString:@"cubic"])
		resampling_int = 4;
	else if([resampling isEqualToString:@"sinc"])
		resampling_int = 5;

	dumb_it_set_resampling_quality(itsr, resampling_int);
	dumb_it_set_ramp_style(itsr, 2);
	dumb_it_set_loop_callback(itsr, callbackLoop, &loops);
	dumb_it_set_xm_speed_zero_callback(itsr, dumb_it_callback_terminate, 0);
	dumb_it_set_global_volume_zero_callback(itsr, dumb_it_callback_terminate, 0);

	loops = 0;
	fadeTotal = fadeRemain = 44100 * 8;

	sampptr = allocate_sample_buffer(2, 1024);

	[self willChangeValueForKey:@"properties"];
	[self didChangeValueForKey:@"properties"];

	return YES;
}

- (NSDictionary *)properties {
	return [NSDictionary dictionaryWithObjectsAndKeys:
	                     [NSNumber numberWithInt:0], @"bitrate",
	                     [NSNumber numberWithFloat:44100], @"sampleRate",
	                     [NSNumber numberWithDouble:((length / 65.536f) * 44.1000)], @"totalFrames",
	                     [NSNumber numberWithInt:32], @"bitsPerSample", // Samples are short
	                     [NSNumber numberWithBool:YES], @"floatingPoint",
	                     [NSNumber numberWithInt:2], @"channels", // output from gme_play is in stereo
	                     [NSNumber numberWithBool:[source seekable]], @"seekable",
	                     @"host", @"endian",
	                     nil];
}

- (int)readAudio:(void *)buf frames:(UInt32)frames {
	int total = 0;
	while(total < frames) {
		int framesToRender = 1024;
		if(framesToRender > frames)
			framesToRender = frames;
		dumb_silence(sampptr[0], framesToRender * 2);
		int rendered = (int)duh_sigrenderer_generate_samples(dsr, 1.0, 65536.0f / 44100.0f, framesToRender, sampptr);

		if(rendered <= 0)
			break;

		for(int i = 0; i < rendered * 2; i++) {
			const float scale = 1.0 / 0x800000;
			((float *)buf)[(total * 2) + i] = (float)sampptr[0][i] * scale;
		}

		if(!IsRepeatOneSet() && loops >= 2) {
			float *sampleBuf = (float *)buf + total * 2;
			long fadeEnd = fadeRemain - rendered;
			if(fadeEnd < 0)
				fadeEnd = 0;
			float fadePosf = (float)fadeRemain / fadeTotal;
			const float fadeStep = 1.0 / fadeTotal;
			for(long fadePos = fadeRemain; fadePos > fadeEnd; --fadePos, fadePosf -= fadeStep) {
				long offset = (fadeRemain - fadePos) * 2;
				float sampleLeft = sampleBuf[offset + 0];
				float sampleRight = sampleBuf[offset + 1];
				sampleLeft *= fadePosf;
				sampleRight *= fadePosf;
				sampleBuf[offset + 0] = sampleLeft;
				sampleBuf[offset + 1] = sampleRight;
			}
			rendered = (int)(fadeRemain - fadeEnd);
			fadeRemain = fadeEnd;
		}

		total += rendered;

		if(rendered < framesToRender)
			break;
	}

	return total;
}

- (long)seek:(long)frame {
	double pos = (double)duh_sigrenderer_get_position(dsr) / 65.536f;
	double seekPos = frame / 44.100;

	if(seekPos < pos) {
		// Reset. Dumb cannot seek backwards. It's dumb.
		[self cleanUp];

		[source seek:0 whence:SEEK_SET];
		[self open:source];

		pos = 0.0;
	}

	int numSamples = (seekPos - pos) / 1000 * 44100;

	duh_sigrenderer_generate_samples(dsr, 1.0f, 65536.0f / 44100.0f, numSamples, NULL);

	return frame;
}

- (void)cleanUp {
	if(sampptr) {
		destroy_sample_buffer(sampptr);
		sampptr = NULL;
	}

	if(dsr) {
		duh_end_sigrenderer(dsr);
		dsr = NULL;
	}
	if(duh) {
		unload_duh(duh);
		duh = NULL;
	}
}

- (void)close {
	[self cleanUp];

	if(source) {
		[source close];
		[self setSource:nil];
	}
}

- (void)dealloc {
	[self close];
}

- (void)setSource:(id<CogSource>)s {
	source = s;
}

- (id<CogSource>)source {
	return source;
}

+ (NSArray *)fileTypes {
	return [NSArray arrayWithObjects:@"it", @"itz", @"xm", @"xmz", @"s3m", @"s3z", @"mod", @"mdz", @"stm", @"stz", @"ptm", @"mtm", @"669", @"psm", @"am", @"j2b", @"dsm", @"amf", @"okt", @"okta", @"umx", @"mo3", nil];
}

+ (NSArray *)mimeTypes {
	return [NSArray arrayWithObjects:@"audio/x-it", @"audio/x-xm", @"audio/x-s3m", @"audio/x-mod", nil];
}

+ (float)priority {
	return 1.0;
}

@end