/* the Music Player Daemon (MPD)
 * Copyright (C) 2003-2007 by Warren Dukes (warren.dukes@gmail.com)
 * This project's homepage is: http://www.musicpd.org
 *
 * 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
 */

/* TODO 'ogg' should probably be replaced with 'oggvorbis' in all instances */

#include "_ogg_common.h"
#include "../utils.h"
#include "../log.h"

#ifndef HAVE_TREMOR
#include <vorbis/vorbisfile.h>
#else
#include <tremor/ivorbisfile.h>
/* Macros to make Tremor's API look like libogg. Tremor always
   returns host-byte-order 16-bit signed data, and uses integer
   milliseconds where libogg uses double seconds. 
*/
#define ov_read(VF, BUFFER, LENGTH, BIGENDIANP, WORD, SGNED, BITSTREAM) \
        ov_read(VF, BUFFER, LENGTH, BITSTREAM)
#define ov_time_total(VF, I) ((double)ov_time_total(VF, I)/1000)
#define ov_time_tell(VF) ((double)ov_time_tell(VF)/1000)
#define ov_time_seek_page(VF, S) (ov_time_seek_page(VF, (S)*1000))
#endif /* HAVE_TREMOR */

#ifdef WORDS_BIGENDIAN
#define OGG_DECODE_USE_BIGENDIAN	1
#else
#define OGG_DECODE_USE_BIGENDIAN	0
#endif

typedef struct _OggCallbackData {
	struct input_stream *inStream;
	struct decoder *decoder;
} OggCallbackData;

static size_t ogg_read_cb(void *ptr, size_t size, size_t nmemb, void *vdata)
{
	size_t ret;
	OggCallbackData *data = (OggCallbackData *) vdata;

	ret = decoder_read(data->decoder, data->inStream, ptr, size * nmemb);

	errno = 0;
	/*if(ret<0) errno = ((struct input_stream *)inStream)->error; */

	return ret / size;
}

static int ogg_seek_cb(void *vdata, ogg_int64_t offset, int whence)
{
	const OggCallbackData *data = (const OggCallbackData *) vdata;
	if(decoder_get_command(data->decoder) == DECODE_COMMAND_STOP)
		return -1;
	return input_stream_seek(data->inStream, offset, whence) ? 0 : -1;
}

/* TODO: check Ogg libraries API and see if we can just not have this func */
static int ogg_close_cb(mpd_unused void *vdata)
{
	return 0;
}

static long ogg_tell_cb(void *vdata)
{
	const OggCallbackData *data = (const OggCallbackData *) vdata;

	return (long)(data->inStream->offset);
}

static const char *ogg_parseComment(const char *comment, const char *needle)
{
	int len = strlen(needle);

	if (strncasecmp(comment, needle, len) == 0 && *(comment + len) == '=') {
		return comment + len + 1;
	}

	return NULL;
}

static void ogg_getReplayGainInfo(char **comments, ReplayGainInfo ** infoPtr)
{
	const char *temp;
	bool found = false;

	if (*infoPtr)
		freeReplayGainInfo(*infoPtr);
	*infoPtr = newReplayGainInfo();

	while (*comments) {
		if ((temp =
		     ogg_parseComment(*comments, "replaygain_track_gain"))) {
			(*infoPtr)->trackGain = atof(temp);
			found = true;
		} else if ((temp = ogg_parseComment(*comments,
						    "replaygain_album_gain"))) {
			(*infoPtr)->albumGain = atof(temp);
			found = true;
		} else if ((temp = ogg_parseComment(*comments,
						    "replaygain_track_peak"))) {
			(*infoPtr)->trackPeak = atof(temp);
			found = true;
		} else if ((temp = ogg_parseComment(*comments,
						    "replaygain_album_peak"))) {
			(*infoPtr)->albumPeak = atof(temp);
			found = true;
		}

		comments++;
	}

	if (!found) {
		freeReplayGainInfo(*infoPtr);
		*infoPtr = NULL;
	}
}

static const char *VORBIS_COMMENT_TRACK_KEY = "tracknumber";
static const char *VORBIS_COMMENT_DISC_KEY = "discnumber";

static unsigned int ogg_parseCommentAddToTag(char *comment,
					     unsigned int itemType,
					     struct tag ** tag)
{
	const char *needle;
	unsigned int len;
	switch (itemType) {
	case TAG_ITEM_TRACK:
		needle = VORBIS_COMMENT_TRACK_KEY;
		break;
	case TAG_ITEM_DISC:
		needle = VORBIS_COMMENT_DISC_KEY;
		break;
	default:
		needle = mpdTagItemKeys[itemType];
	}
	len = strlen(needle);

	if (strncasecmp(comment, needle, len) == 0 && *(comment + len) == '=') {
		if (!*tag)
			*tag = tag_new();

		tag_add_item(*tag, itemType, comment + len + 1);

		return 1;
	}

	return 0;
}

static struct tag *oggCommentsParse(char **comments)
{
	struct tag *tag = NULL;

	while (*comments) {
		int j;
		for (j = TAG_NUM_OF_ITEM_TYPES; --j >= 0;) {
			if (ogg_parseCommentAddToTag(*comments, j, &tag))
				break;
		}
		comments++;
	}

	return tag;
}

static void putOggCommentsIntoOutputBuffer(char *streamName,
					   char **comments)
{
	struct tag *tag;

	tag = oggCommentsParse(comments);
	if (!tag && streamName) {
		tag = tag_new();
	}
	if (!tag)
		return;

	if (streamName) {
		tag_clear_items_by_type(tag, TAG_ITEM_NAME);
		tag_add_item(tag, TAG_ITEM_NAME, streamName);
	}

	tag_free(tag);
}

/* public */
static bool
oggvorbis_decode(struct decoder *decoder, struct input_stream *inStream)
{
	OggVorbis_File vf;
	ov_callbacks callbacks;
	OggCallbackData data;
	struct audio_format audio_format;
	int current_section;
	int prev_section = -1;
	long ret;
#define OGG_CHUNK_SIZE 4096
	char chunk[OGG_CHUNK_SIZE];
	int chunkpos = 0;
	long bitRate = 0;
	long test;
	ReplayGainInfo *replayGainInfo = NULL;
	char **comments;
	const char *errorStr;
	bool initialized = false;

	data.inStream = inStream;
	data.decoder = decoder;

	callbacks.read_func = ogg_read_cb;
	callbacks.seek_func = ogg_seek_cb;
	callbacks.close_func = ogg_close_cb;
	callbacks.tell_func = ogg_tell_cb;
	if ((ret = ov_open_callbacks(&data, &vf, NULL, 0, callbacks)) < 0) {
		if (decoder_get_command(decoder) != DECODE_COMMAND_NONE)
			return true;

		switch (ret) {
		case OV_EREAD:
			errorStr = "read error";
			break;
		case OV_ENOTVORBIS:
			errorStr = "not vorbis stream";
			break;
		case OV_EVERSION:
			errorStr = "vorbis version mismatch";
			break;
		case OV_EBADHEADER:
			errorStr = "invalid vorbis header";
			break;
		case OV_EFAULT:
			errorStr = "internal logic error";
			break;
		default:
			errorStr = "unknown error";
			break;
		}
		ERROR("Error decoding Ogg Vorbis stream: %s\n",
		      errorStr);
		return false;
	}
	audio_format.bits = 16;

	while (true) {
		if (decoder_get_command(decoder) == DECODE_COMMAND_SEEK) {
			double seek_where = decoder_seek_where(decoder);
			if (0 == ov_time_seek_page(&vf, seek_where)) {
				chunkpos = 0;
				decoder_command_finished(decoder);
			} else
				decoder_seek_error(decoder);
		}
		ret = ov_read(&vf, chunk + chunkpos,
			      OGG_CHUNK_SIZE - chunkpos,
			      OGG_DECODE_USE_BIGENDIAN, 2, 1, &current_section);
		if (current_section != prev_section) {
			/*printf("new song!\n"); */
			vorbis_info *vi = ov_info(&vf, -1);
			audio_format.channels = vi->channels;
			audio_format.sample_rate = vi->rate;
			if (!initialized) {
				float total_time = ov_time_total(&vf, -1);
				if (total_time < 0)
					total_time = 0;
				decoder_initialized(decoder, &audio_format,
						    total_time);
				initialized = true;
			}
			comments = ov_comment(&vf, -1)->user_comments;
			putOggCommentsIntoOutputBuffer(inStream->meta_name,
						       comments);
			ogg_getReplayGainInfo(comments, &replayGainInfo);
		}

		prev_section = current_section;

		if (ret <= 0) {
			if (ret == OV_HOLE) /* bad packet */
				ret = 0;
			else /* break on EOF or other error */
				break;
		}

		chunkpos += ret;

		if (chunkpos >= OGG_CHUNK_SIZE) {
			if ((test = ov_bitrate_instant(&vf)) > 0) {
				bitRate = test / 1000;
			}
			decoder_data(decoder, inStream,
				     inStream->seekable,
				     chunk, chunkpos,
				     ov_pcm_tell(&vf) / audio_format.sample_rate,
				     bitRate, replayGainInfo);
			chunkpos = 0;
			if (decoder_get_command(decoder) == DECODE_COMMAND_STOP)
				break;
		}
	}

	if (decoder_get_command(decoder) == DECODE_COMMAND_NONE &&
	    chunkpos > 0) {
		decoder_data(decoder, NULL, inStream->seekable,
			     chunk, chunkpos,
			     ov_time_tell(&vf), bitRate,
			     replayGainInfo);
	}

	if (replayGainInfo)
		freeReplayGainInfo(replayGainInfo);

	ov_clear(&vf);
	return true;
}

static struct tag *oggvorbis_TagDup(char *file)
{
	struct tag *ret;
	FILE *fp;
	OggVorbis_File vf;

	fp = fopen(file, "r");
	if (!fp) {
		DEBUG("oggvorbis_TagDup: Failed to open file: '%s', %s\n",
		      file, strerror(errno));
		return NULL;
	}
	if (ov_open(fp, &vf, NULL, 0) < 0) {
		fclose(fp);
		return NULL;
	}

	ret = oggCommentsParse(ov_comment(&vf, -1)->user_comments);

	if (!ret)
		ret = tag_new();
	ret->time = (int)(ov_time_total(&vf, -1) + 0.5);

	ov_clear(&vf);

	return ret;
}

static bool
oggvorbis_try_decode(struct input_stream *inStream)
{
	if (!inStream->seekable)
		/* we cannot seek after the detection, so don't bother
		   checking */
		return true;

	return ogg_stream_type_detect(inStream) == VORBIS;
}

static const char *oggvorbis_Suffixes[] = { "ogg","oga", NULL };
static const char *oggvorbis_MimeTypes[] = { "application/ogg",
					     "audio/x-vorbis+ogg",
					     "application/x-ogg",
					     NULL };

struct decoder_plugin oggvorbisPlugin = {
	.name = "oggvorbis",
	.try_decode = oggvorbis_try_decode,
	.stream_decode = oggvorbis_decode,
	.tag_dup = oggvorbis_TagDup,
	.stream_types = INPUT_PLUGIN_STREAM_URL | INPUT_PLUGIN_STREAM_FILE,
	.suffixes = oggvorbis_Suffixes,
	.mime_types = oggvorbis_MimeTypes
};