#include "meta.h"
#include "../coding/coding.h"

#ifdef VGM_USE_MP4V2
void* mp4_file_open( const char* name, MP4FileMode mode )
{
	char * endptr;
#ifdef _MSC_VER
	unsigned __int64 ptr = _strtoui64( name, &endptr, 16 );
#else
	unsigned long ptr = strtoul( name, &endptr, 16 );
#endif
	return (void*) ptr;
}

int mp4_file_seek( void* handle, int64_t pos )
{
	mp4_streamfile * file = ( mp4_streamfile * ) handle;
	if ( pos > file->size ) pos = file->size;
	pos += file->start;
	file->offset = pos;
	return 0;
}

int mp4_file_get_size( void* handle, int64_t* size )
{
	mp4_streamfile * file = ( mp4_streamfile * ) handle;
	*size = file->size;
	return 0;
}

int mp4_file_read( void* handle, void* buffer, int64_t size, int64_t* nin, int64_t maxChunkSize )
{
	mp4_streamfile * file = ( mp4_streamfile * ) handle;
	int64_t max_size = file->size - file->offset - file->start;
	if ( size > max_size ) size = max_size;
	if ( size > 0 )
	{
		*nin = read_streamfile( (uint8_t *) buffer, file->offset, size, file->streamfile );
		file->offset += *nin;
	}
	else
	{
		*nin = 0;
		return 1;
	}
	return 0;
}

int mp4_file_write( void* handle, const void* buffer, int64_t size, int64_t* nout, int64_t maxChunkSize )
{
	return 1;
}

int mp4_file_close( void* handle )
{
	return 0;
}

MP4FileProvider mp4_file_provider = { mp4_file_open, mp4_file_seek, mp4_file_read, mp4_file_write, mp4_file_close, mp4_file_get_size };

#ifdef VGM_USE_FDKAAC
VGMSTREAM * init_vgmstream_mp4_aac_offset(STREAMFILE *streamFile, uint64_t start, uint64_t size);

VGMSTREAM * init_vgmstream_mp4_aac(STREAMFILE *streamFile) {
	return init_vgmstream_mp4_aac_offset( streamFile, 0, streamFile->get_size(streamFile) );
}

VGMSTREAM * init_vgmstream_mp4_aac_offset(STREAMFILE *streamFile, uint64_t start, uint64_t size) {
	VGMSTREAM * vgmstream = NULL;

	char filename[PATH_LIMIT];

	mp4_aac_codec_data * aac_file = ( mp4_aac_codec_data * ) calloc(1, sizeof(mp4_aac_codec_data));

	CStreamInfo * stream_info;

	uint8_t * buffer = NULL;
	uint32_t buffer_size;
	UINT ubuffer_size, bytes_valid;

	if ( !aac_file ) goto fail;

	aac_file->if_file.streamfile = streamFile;
	aac_file->if_file.start = start;
	aac_file->if_file.offset = start;
	aac_file->if_file.size = size;

	/* Big ol' kludge! */
	sprintf( filename, "%p", &aac_file->if_file );
	aac_file->h_mp4file = MP4ReadProvider( filename, &mp4_file_provider );
	if ( !aac_file->h_mp4file ) goto fail;

	if ( MP4GetNumberOfTracks(aac_file->h_mp4file, MP4_AUDIO_TRACK_TYPE, '\000') != 1 ) goto fail;

	aac_file->track_id = MP4FindTrackId( aac_file->h_mp4file, 0, MP4_AUDIO_TRACK_TYPE, '\000' );

	aac_file->h_aacdecoder = aacDecoder_Open( TT_MP4_RAW, 1 );
	if ( !aac_file->h_aacdecoder ) goto fail;

	aacDecoder_SetParam( aac_file->h_aacdecoder, AAC_PCM_OUTPUT_CHANNELS, 2 );

	MP4GetTrackESConfiguration( aac_file->h_mp4file, aac_file->track_id, (uint8_t**)(&buffer), (uint32_t*)(&buffer_size));

	ubuffer_size = buffer_size;
	if ( aacDecoder_ConfigRaw( aac_file->h_aacdecoder, &buffer, &ubuffer_size ) ) goto fail;

	free( buffer ); buffer = NULL;

	aac_file->sampleId = 1;
	aac_file->numSamples = MP4GetTrackNumberOfSamples( aac_file->h_mp4file, aac_file->track_id );

	if (!MP4ReadSample(aac_file->h_mp4file, aac_file->track_id, aac_file->sampleId, (uint8_t**)(&buffer), (uint32_t*)(&buffer_size), 0, 0, 0, 0)) goto fail;

	ubuffer_size = buffer_size;
	bytes_valid = buffer_size;
	if ( aacDecoder_Fill( aac_file->h_aacdecoder, &buffer, &ubuffer_size, &bytes_valid ) || bytes_valid ) goto fail;
	if ( aacDecoder_DecodeFrame( aac_file->h_aacdecoder, aac_file->sample_buffer, ( (6) * (2048)*4 ), 0 ) ) goto fail;

	free( buffer ); buffer = NULL;

	aac_file->sample_ptr = 0;

	stream_info = aacDecoder_GetStreamInfo( aac_file->h_aacdecoder );

	aac_file->samples_per_frame = stream_info->frameSize;
	aac_file->samples_discard = 0;

	streamFile->get_name( streamFile, filename, sizeof(filename) );

	aac_file->if_file.streamfile = streamFile->open(streamFile, filename, STREAMFILE_DEFAULT_BUFFER_SIZE);
	if (!aac_file->if_file.streamfile) goto fail;

	vgmstream = allocate_vgmstream( stream_info->numChannels, 1 );
	if (!vgmstream) goto fail;

	vgmstream->loop_flag = 0;

	vgmstream->codec_data = aac_file;

	vgmstream->channels = stream_info->numChannels;
	vgmstream->sample_rate = stream_info->sampleRate;

	vgmstream->num_samples = stream_info->frameSize * aac_file->numSamples;

	vgmstream->coding_type = coding_MP4_AAC;
	vgmstream->layout_type = layout_none;
	vgmstream->meta_type = meta_MP4;

	return vgmstream;

fail:
	if ( buffer ) free( buffer );
	if ( aac_file ) {
		if ( aac_file->h_aacdecoder ) aacDecoder_Close( aac_file->h_aacdecoder );
		if ( aac_file->h_mp4file ) MP4Close( aac_file->h_mp4file, 0 );
		free( aac_file );
	}
	return NULL;
}
#endif
#endif


#ifdef VGM_USE_FFMPEG

static int find_atom_be(STREAMFILE *streamFile, uint32_t atom_id, off_t start_offset, off_t *out_atom_offset, size_t *out_atom_size);


VGMSTREAM * init_vgmstream_mp4_aac_ffmpeg(STREAMFILE *streamFile) {
    VGMSTREAM * vgmstream = NULL;
    off_t start_offset = 0;
    int loop_flag = 0;
    int32_t num_samples = 0, loop_start_sample = 0, loop_end_sample = 0;
    size_t filesize;
    off_t atom_offset;
    size_t atom_size;
    int is_ffdl = 0;

    ffmpeg_codec_data *ffmpeg_data = NULL;


    /* check extension, case insensitive */
    /*  .bin: Final Fantasy Dimensions (iOS), Final Fantasy V (iOS) */
    if (!check_extensions(streamFile,"mp4,m4a,m4v,lmp4,bin"))
        goto fail;

    filesize = streamFile->get_size(streamFile);

    /* check header for Final Fantasy Dimensions */
    if (read_32bitBE(0x00,streamFile) == 0x4646444C) { /* "FFDL" (any kind of file) */
        is_ffdl = 1;
        if (read_32bitBE(0x04,streamFile) == 0x6D747873) { /* "mtxs" (bgm file) */
            /* this value is erratic so we'll use FFmpeg's num_samples
             *  (can be bigger = silence-padded, or smaller = cut; doesn't matter for looping though)*/
            num_samples = read_32bitLE(0x08,streamFile);
            /* loop samples are within num_samples, and don't have encoder delay (loop_start=0 starts from encoder_delay) */
            loop_start_sample = read_32bitLE(0x0c,streamFile);
            loop_end_sample = read_32bitLE(0x10,streamFile);
            loop_flag = !(loop_start_sample==0 && loop_end_sample==num_samples);
            start_offset = 0x14;

            /* some FFDL have muxed streams ("FFDL" + "mtxs" data1 + mp4 data1 + "mtxs" data2 + mp4 data2 + etc)
             *  check if there is anything after the first mp4 data */
            if (!find_atom_be(streamFile, 0x6D646174, start_offset, &atom_offset, &atom_size)) goto fail; /* "mdat" */
            if (atom_offset-8 + atom_size < filesize && read_32bitBE(atom_offset-8 + atom_size,streamFile) == 0x6D747873) { /*"mtxs"*/
                VGM_LOG("FFDL: multiple streams found\n");
                filesize = atom_offset-8 + atom_size; /* clamp size, though FFmpeg will ignore the extra data anyway */
            }
        } else {
            start_offset = 0x4; /* some SEs contain "ftyp" after "FFDL" */
        }
    }

    /* check header */
    if ( read_32bitBE(start_offset+0x04,streamFile) != 0x66747970) /* atom size @0x00 + "ftyp" @0x04 */
        goto fail;

    ffmpeg_data = init_ffmpeg_offset(streamFile, start_offset, filesize);
    if ( !ffmpeg_data ) goto fail;

    /* Tales of Hearts iOS has loop info in the first "free" atom */
    if (!is_ffdl && find_atom_be(streamFile, 0x66726565, start_offset, &atom_offset, &atom_size)) { /* "free" */
        if (read_32bitBE(atom_offset,streamFile) == 0x4F700002
                && (atom_size == 0x38 || atom_size == 0x40)) { /* make sure it's ToHr "free" */
            /* 0x00: id?  0x04/8: s_rate; 0x10: num_samples (without padding, same as FFmpeg's)  */
            /* 0x14/18/1c: 0x238/250/278?  0x20: ?  0x24: start_pad */
            loop_flag = read_32bitBE(atom_offset+0x28,streamFile);
            if (loop_flag) { /* atom ends if no loop flag */
                loop_start_sample = read_32bitBE(atom_offset+0x2c,streamFile);
                loop_end_sample = read_32bitBE(atom_offset+0x30,streamFile);
            }
        }
    }

    /* build the VGMSTREAM */
    vgmstream = allocate_vgmstream(ffmpeg_data->channels,loop_flag);
    if (!vgmstream) goto fail;
    vgmstream->codec_data = ffmpeg_data;
    vgmstream->coding_type = coding_FFmpeg;
    vgmstream->layout_type = layout_none;
    vgmstream->meta_type = meta_FFmpeg;

    vgmstream->num_samples = ffmpeg_data->totalSamples;
    vgmstream->sample_rate = ffmpeg_data->sampleRate;
    vgmstream->channels = ffmpeg_data->channels;
    vgmstream->loop_start_sample = loop_start_sample;
    vgmstream->loop_end_sample = loop_end_sample;

    return vgmstream;

fail:
    if (ffmpeg_data) {
        free_ffmpeg(ffmpeg_data);
        if (vgmstream) vgmstream->codec_data = NULL;
    }
    if (vgmstream) close_vgmstream(vgmstream);
    return NULL;
}

/**
 * Almost the same as streamfile.c's find_chunk but for "atom" chunks, which have chunk_size first because Apple.
 *
 * returns 0 on failure
 */
static int find_atom_be(STREAMFILE *streamFile, uint32_t atom_id, off_t start_offset, off_t *out_atom_offset, size_t *out_atom_size) {
    size_t filesize;
    off_t current_atom = start_offset;
    int full_atom_size = 1;
    int size_big_endian = 1;

    filesize = get_streamfile_size(streamFile);
    /* read chunks */
    while (current_atom < filesize) {
        off_t chunk_size = size_big_endian ?
                read_32bitBE(current_atom+0,streamFile) :
                read_32bitLE(current_atom+0,streamFile);
        uint32_t chunk_type = read_32bitBE(current_atom+4,streamFile);

        if (chunk_type == atom_id) {
            if (out_atom_size) *out_atom_size = chunk_size;
            if (out_atom_offset) *out_atom_offset = current_atom+8;
            return 1;
        }

        current_atom += full_atom_size ? chunk_size : 4+4+chunk_size;
    }

    return 0;
}

#endif