/*************************************************************************/
/*  cp_loader_it_instruments.cpp                                         */
/*************************************************************************/
/*                       This file is part of:                           */
/*                           GODOT ENGINE                                */
/*                      https://godotengine.org                          */
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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_it.h"

enum EnvFlags {
	ENV_ON = 1,
	ENV_LOOP = 2,
	ENV_SUSLOOP = 4,
	ENV_CARRY = 8,
	ENV_FILTER = 128
};

void CPLoader_IT::load_envelope(CPEnvelope *p_envelope, bool *p_has_filter_flag) {

	uint8_t flags = file->get_byte();
	uint8_t points = file->get_byte();
	uint8_t begin = file->get_byte();
	uint8_t end = file->get_byte();
	uint8_t susbegin = file->get_byte();
	uint8_t susend = file->get_byte();

	p_envelope->reset();

	for (int i = 0; i < 25; i++) {

		uint8_t height = file->get_byte();
		int8_t &signed_height = (int8_t &)height;
		uint16_t tick = file->get_word();

		if (i >= points)
			continue;
		p_envelope->add_position(tick, signed_height);
	}

	p_envelope->set_enabled(flags & ENV_ON);
	p_envelope->set_carry_enabled(flags & ENV_CARRY);

	p_envelope->set_loop_enabled(flags & ENV_LOOP);
	p_envelope->set_loop_begin(begin);
	p_envelope->set_loop_end(end);

	p_envelope->set_sustain_loop_enabled(flags & ENV_SUSLOOP);
	p_envelope->set_sustain_loop_begin(susbegin);
	p_envelope->set_sustain_loop_end(susend);

	if (p_has_filter_flag)
		*p_has_filter_flag = flags & ENV_FILTER;

	file->get_byte(); //zerobyte

	//fill with stuff if the envelope hass less than 2 points
	while (p_envelope->get_node_count() < 2) {

		p_envelope->add_position(30 * p_envelope->get_node_count(), p_envelope->get_min() == 0 ? 64 : 0, false);
	}
}

CPLoader::Error CPLoader_IT::load_instrument(CPInstrument *p_instrument, int *p_samples) {

	char aux_header[4];

	file->get_byte_array((uint8_t *)aux_header, 4);

	if (aux_header[0] != 'I' ||
			aux_header[1] != 'M' ||
			aux_header[2] != 'P' ||
			aux_header[3] != 'I') {
		CP_PRINTERR("IT CPLoader CPInstrument: Failed Identifier");

		return FILE_UNRECOGNIZED;
	}

	// Ignore deprecated 8.3 filename field
	for (int i = 0; i < 12; i++)
		file->get_byte();

	//Ignore zerobyte
	file->get_byte(); /* (byte) CPInstrument type (always 0) */

	switch (file->get_byte()) { /* New CPNote Action [0,1,2,3] */
		case 0: p_instrument->set_NNA_type(CPInstrument::NNA_NOTE_CUT); break;
		case 1: p_instrument->set_NNA_type(CPInstrument::NNA_NOTE_CONTINUE); break;
		case 2: p_instrument->set_NNA_type(CPInstrument::NNA_NOTE_OFF); break;
		case 3: p_instrument->set_NNA_type(CPInstrument::NNA_NOTE_FADE); break;
	};
	switch (file->get_byte()) { // Duplicate Check Type
		case 0: p_instrument->set_DC_type(CPInstrument::DCT_DISABLED); break;
		case 1: p_instrument->set_DC_type(CPInstrument::DCT_NOTE); break;
		case 2: p_instrument->set_DC_type(CPInstrument::DCT_SAMPLE); break;
		case 3: p_instrument->set_DC_type(CPInstrument::DCT_INSTRUMENT); break;
	}
	switch (file->get_byte()) { //Duplicate Check Action
		case 0: p_instrument->set_DC_action(CPInstrument::DCA_NOTE_CUT); break;
		case 1: p_instrument->set_DC_action(CPInstrument::DCA_NOTE_OFF); break;
		case 2: p_instrument->set_DC_action(CPInstrument::DCA_NOTE_FADE); break;
	}

	int fade = file->get_word();
	//intf("AFADE: %i\n",fade);
	if (fade > CPInstrument::MAX_FADEOUT) //needs to be clipped because of horrible modplug doings
		fade = CPInstrument::MAX_FADEOUT;

	p_instrument->set_volume_fadeout(fade);
	p_instrument->set_pan_pitch_separation(file->get_byte());
	p_instrument->set_pan_pitch_center(file->get_byte());
	p_instrument->set_volume_global_amount(file->get_byte());
	uint8_t pan = file->get_byte();
	p_instrument->set_pan_default_amount(pan & 0x7F);
	p_instrument->set_pan_default_enabled(!(pan & 0x80));
	p_instrument->set_volume_random_variation(file->get_byte());
	p_instrument->set_pan_random_variation(file->get_byte());

	file->get_word(); //empty (version)
	uint8_t samples = file->get_byte();
	if (p_samples)
		*p_samples = samples;
	file->get_byte(); //empty
	char aux_name[26];
	file->get_byte_array((uint8_t *)aux_name, 26);
	p_instrument->set_name(aux_name);

	uint8_t cutoff = file->get_byte();

	p_instrument->set_filter_default_cutoff(cutoff & 0x7F);
	p_instrument->set_filter_use_default_cutoff(cutoff & 0x80);

	uint8_t resonance = file->get_byte();

	p_instrument->set_filter_default_resonance(resonance & 0x7F);
	p_instrument->set_filter_use_default_resonance(resonance & 0x80);

	file->get_dword(); //MIDI, IGNORED!

	/* CPNote -> CPSample table */
	for (uint8_t i = 0; i < CPNote::NOTES; i++) {

		uint8_t note = file->get_byte();
		if (note >= CPNote::NOTES)
			note = 0;
		p_instrument->set_note_number(i, note);

		uint8_t samp = file->get_byte();
		if (samp == 0 || samp > 99)
			samp = CPNote::EMPTY;
		else
			samp--;

		p_instrument->set_sample_number(i, samp);
	}

	load_envelope(p_instrument->get_volume_envelope());
	load_envelope(p_instrument->get_pan_envelope());
	bool use_as_filter;
	load_envelope(p_instrument->get_pitch_filter_envelope(), &use_as_filter);
	p_instrument->set_pitch_use_as_filter(use_as_filter);

	return FILE_OK;
}

CPLoader::Error CPLoader_IT::load_instruments() {

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

		file->seek(0xC0 + header.ordnum + i * 4);
		uint32_t final_location = file->get_dword();
		file->seek(final_location);

		Error err = load_instrument(song->get_instrument(i));
		if (err)
			return err;
	}

	return FILE_OK;

	if (file->eof_reached() || file->get_error())
		return FILE_CORRUPTED;
}