/*************************************************************************/
/*  cp_loader_s3m.cpp                                                    */
/*************************************************************************/
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/*                           GODOT ENGINE                                */
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/* Copyright (c) 2007-2019 Juan Linietsky, Ariel Manzur.                 */
/* Copyright (c) 2014-2019 Godot Engine contributors (cf. AUTHORS.md)    */
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#include "cp_loader_s3m.h"

#define BITBOOL(m_exp) ((m_exp) ? 1 : 0)

CPLoader::Error CPLoader_S3M::load_header() {

	int i;

	file->get_byte_array((uint8_t *)header.songname, 28);
	header.t1a = file->get_byte();
	header.type = file->get_byte();
	file->get_byte_array((uint8_t *)header.unused1, 2);
	header.ordnum = file->get_word();
	header.insnum = file->get_word();
	header.patnum = file->get_word();
	header.flags = file->get_word();
	header.tracker = file->get_word();
	header.fileformat = file->get_word();
	file->get_byte_array((uint8_t *)header.scrm, 4);
	header.scrm[4] = 0;

	if (header.scrm[0] != 'S' || header.scrm[1] != 'C' || header.scrm[2] != 'R' || header.scrm[3] != 'M')
		return FILE_UNRECOGNIZED;

	header.mastervol = file->get_byte();
	header.initspeed = file->get_byte();
	header.inittempo = file->get_byte();
	header.mastermult = file->get_byte();
	header.ultraclick = file->get_byte();
	header.pantable = file->get_byte();
	file->get_byte_array((uint8_t *)header.unused2, 8);
	header.special = file->get_word();
	file->get_byte_array((uint8_t *)header.channels, 32);

	file->get_byte_array((uint8_t *)header.orderlist, header.ordnum);

	header.scrm[4] = 0;
	if (header.scrm[0] != 'S' || header.scrm[1] != 'C' || header.scrm[2] != 'R' || header.scrm[3] != 'M') //again?
		return FILE_UNRECOGNIZED;
	//sample parapointers
	for (i = 0; i < header.insnum; i++) {

		int parapointer;
		parapointer = file->get_word();
		parapointer = (parapointer * 16);
		sample_parapointers[i] = parapointer;
	}
	//pattern
	for (i = 0; i < header.patnum; i++) {

		int parapointer;
		parapointer = file->get_word();
		parapointer = (parapointer * 16);
		pattern_parapointers[i] = parapointer;
	}

	if (header.pantable == 252) {

		file->get_byte_array((uint8_t *)header.pannings, 32);
	}

	return FILE_OK;
}

void CPLoader_S3M::set_header() {

	song->set_name(header.songname);
	//	song->variables.filename=

	song->set_row_highlight_minor(4);
	song->set_row_highlight_major(16);
	song->set_mixing_volume(header.mastervol);
	song->set_linear_slides(false);
	song->set_old_effects(!(header.flags & 64));
	song->set_compatible_gxx(true);

	song->set_global_volume(header.mastermult);
	song->set_speed(header.initspeed);
	song->set_tempo(header.inittempo);

	//[TODO] Set Panning Positions.. ?

	for (int i = 0; i < header.ordnum; i++)
		song->set_order(i, header.orderlist[i]);
}

CPLoader::Error CPLoader_S3M::load_sample(CPSample *p_sample) {

	int type = file->get_byte();

	char filename[13];
	file->get_byte_array((uint8_t *)filename, 12);
	filename[12] = 0;

	uint32_t samplepos = (uint32_t)file->get_byte() << 16;
	samplepos |= file->get_word();
	samplepos *= 16;
	//		printf("sample at %i\n",samplepos);
	/**/
	int sample_size = file->get_dword();

	int loop_begin = file->get_dword();
	int loop_end = file->get_dword();

	int def_volume = file->get_byte();
	;
	int dsk = file->get_byte();
	int pack = file->get_byte();

	int flags = file->get_byte();
	int c2speed = file->get_dword();

	file->get_dword(); //useless crap
	file->get_dword();
	file->get_dword();

	char name[29];
	file->get_byte_array((uint8_t *)name, 28);
	name[28] = 0;

	p_sample->set_default_volume(def_volume);
	p_sample->set_name(name);

	char scrs[5];
	file->get_byte_array((uint8_t *)scrs, 4);
	scrs[4] = 0;

	bool data_is_16bits = flags & 4;
	bool data_is_stereo = flags & 2;

	if (type == 0) {
		//empty sample
		return FILE_OK;
	}

	if ((type != 1) || scrs[0] != 'S' || scrs[1] != 'C' || scrs[2] != 'R' || scrs[3] != 'S') {
		//			printf("type: %i, %c%c%c%c\n",type,scrs[0],scrs[1],scrs[2],scrs[3]);
		CP_PRINTERR("Not an S3M CPSample!");
		return FILE_CORRUPTED;
	}

	//p_sample->data.set_c5_freq(p_sample->c2spd<<1);

	file->seek(samplepos);

	int real_sample_size = sample_size << BITBOOL(data_is_16bits);
	real_sample_size <<= BITBOOL(data_is_stereo);

	CPSampleManager *sm = CPSampleManager::get_singleton();

	CPSample_ID id = sm->create(data_is_16bits, data_is_stereo, sample_size);

	if (id.is_null())
		return FILE_OUT_OF_MEMORY;

	sm->lock_data(id);
	void *dataptr = sm->get_data(id);

	int chans = (data_is_stereo ? 2 : 1);
	for (int c = 0; c < chans; c++) {
		for (int i = 0; i < sample_size; i++) {

			if (data_is_16bits) {

				uint16_t s = file->get_word();
				s -= 32768; //toggle sign

				int16_t *v = (int16_t *)&s;
				((int16_t *)dataptr)[i * chans + c] = *v;
			} else {

				int8_t *v;
				uint8_t s = file->get_byte();
				s -= 128; //toggle sign
				v = (int8_t *)&s;
				((int8_t *)dataptr)[i * chans + c] = *v;
			}
		}
	}

	sm->unlock_data(id);

	sm->set_loop_begin(id, loop_begin);
	sm->set_loop_end(id, loop_end);
	sm->set_loop_type(id, (flags & 1) ? CP_LOOP_FORWARD : CP_LOOP_NONE);
	sm->set_c5_freq(id, c2speed << 1);
	p_sample->set_sample_data(id);

	/* Scream tracker previous to 3.10 seems to be buggy, as in, wont save what is after the sample loop, including the loop end point. Because of this I must fix it by habd */
	if (flags & 1) {

		for (int c = 0; c < (data_is_stereo ? 2 : 1); c++) {
			sm->set_data(id, loop_end, sm->get_data(id, loop_begin, c), c);
		}
	}

	return FILE_OK;
}

CPLoader::Error CPLoader_S3M::load_pattern(CPPattern *p_pattern) {

	int row = 0, flag, ch;
	CPNote n;
	int length, accum = 0;

	length = file->get_word();
	p_pattern->set_length(64);

	/* clear pattern data */
	while ((row < 64) && (accum <= length)) {
		flag = file->get_byte();
		accum++;

		n.clear();
		if (flag) {
			// ch=remap[flag&31];
			//                        ch=remap[flag&31];
			//                        if(ch!=-1)
			//                                n=s3mbuf[(64U*ch)+row];
			//                        else
			//                                n=&dummy;

			ch = flag & 31;

			if (flag & 32) {
				n.note = file->get_byte();
				if (n.note == 255) {

					n.note = CPNote::EMPTY;
				} else if (n.note == 254) {

					n.note = CPNote::CUT;
				} else {

					n.note = ((n.note >> 4) * 12) + (n.note & 0xF);
				}

				n.instrument = file->get_byte() - 1;
				accum += 2;
			}
			if (flag & 64) {
				n.volume = file->get_byte();
				if (n.volume > 64) n.volume = 64;
				accum++;
			}
			if (flag & 128) {
				n.command = file->get_byte() - 1;
				n.parameter = file->get_byte();
				accum += 2;
			}

			p_pattern->set_note(ch, row, n);
		} else
			row++;
	}
	return FILE_OK;
}

CPLoader::Error CPLoader_S3M::load_sample(const char *p_file, CPSample *p_sample) {

	return FILE_UNRECOGNIZED;
}
CPLoader::Error CPLoader_S3M::load_instrument(const char *p_file, CPSong *p_song, int p_instr_idx) {

	return FILE_UNRECOGNIZED;
}

CPLoader::Error CPLoader_S3M::load_samples() {

	int i;

	for (i = 0; i < header.insnum; i++) {

		file->seek(sample_parapointers[i]);
		load_sample(song->get_sample(i));
		sample_count++;
	}

	return FILE_OK;
}

CPLoader::Error CPLoader_S3M::load_patterns() {

	int i;

	Error err;
	for (i = 0; i < header.patnum; i++) {

		file->seek(pattern_parapointers[i]);

		err = load_pattern(song->get_pattern(i));
		CP_ERR_COND_V(err, err);

		pattern_count++;
	}
	return FILE_OK;
}

CPLoader::Error CPLoader_S3M::load_song(const char *p_file, CPSong *p_song, bool p_sampleset) {

	song = p_song;

	if (file->open(p_file, CPFileAccessWrapper::READ)) {
		//printf("Can't open file! %s\n",p_file);
		return FILE_CANNOT_OPEN;
	};

	sample_count = 0;
	pattern_count = 0;

	//printf("LOADING HEADER\n");
	CPLoader::Error err;
	if ((err = load_header())) {
		file->close();
		CP_ERR_COND_V(err, err);
	}

	song->reset(); //file type recognized, reset song!

	set_header();

	//printf("LOADING SAMPLES\n");

	if ((err = load_samples())) {
		file->close();

		CP_ERR_COND_V(err, err);
	}

	//printf("LOADING PATTERNS\n");

	if ((err = load_patterns())) {

		file->close();
		return err;
	}

	file->close();

	return FILE_OK;
}

CPLoader_S3M::CPLoader_S3M(CPFileAccessWrapper *p_file) {

	file = p_file;
}
CPLoader_S3M::~CPLoader_S3M() {
}