/*
 * XMTools.h
 * ---------
 * Purpose: Definition of XM file structures and helper functions
 * Notes  : (currently none)
 * Authors: OpenMPT Devs
 * The OpenMPT source code is released under the BSD license. Read LICENSE for more details.
 */


#pragma once

#include "openmpt/all/BuildSettings.hpp"
#include "openmpt/base/Endian.hpp"
#include "Snd_defs.h"


OPENMPT_NAMESPACE_BEGIN


// XM File Header
struct XMFileHeader
{
	enum XMHeaderFlags
	{
		linearSlides        = 0x01,
		extendedFilterRange = 0x1000,
	};

	char     signature[17];    // "Extended Module: "
	char     songName[20];     // Song Name, space-padded
	uint8le  eof;              // DOS EOF Character (0x1A)
	char     trackerName[20];  // Software that was used to create the XM file
	uint16le version;          // File version (1.02 - 1.04 are supported)
	uint32le size;             // Header Size
	uint16le orders;           // Number of Orders
	uint16le restartPos;       // Restart Position
	uint16le channels;         // Number of Channels
	uint16le patterns;         // Number of Patterns
	uint16le instruments;      // Number of Unstruments
	uint16le flags;            // Song Flags
	uint16le speed;            // Default Speed
	uint16le tempo;            // Default Tempo
};

MPT_BINARY_STRUCT(XMFileHeader, 80)


// XM Instrument Data
struct XMInstrument
{
	// Envelope Flags
	enum XMEnvelopeFlags
	{
		envEnabled = 0x01,
		envSustain = 0x02,
		envLoop    = 0x04,
	};

	uint8le  sampleMap[96];    // Note -> Sample assignment
	uint16le volEnv[24];       // Volume envelope nodes / values (0...64)
	uint16le panEnv[24];       // Panning envelope nodes / values (0...63)
	uint8le  volPoints;        // Volume envelope length
	uint8le  panPoints;        // Panning envelope length
	uint8le  volSustain;       // Volume envelope sustain point
	uint8le  volLoopStart;     // Volume envelope loop start point
	uint8le  volLoopEnd;       // Volume envelope loop end point
	uint8le  panSustain;       // Panning envelope sustain point
	uint8le  panLoopStart;     // Panning envelope loop start point
	uint8le  panLoopEnd;       // Panning envelope loop end point
	uint8le  volFlags;         // Volume envelope flags
	uint8le  panFlags;         // Panning envelope flags
	uint8le  vibType;          // Sample Auto-Vibrato Type
	uint8le  vibSweep;         // Sample Auto-Vibrato Sweep
	uint8le  vibDepth;         // Sample Auto-Vibrato Depth
	uint8le  vibRate;          // Sample Auto-Vibrato Rate
	uint16le volFade;          // Volume Fade-Out
	uint8le  midiEnabled;      // MIDI Out Enabled (0 / 1)
	uint8le  midiChannel;      // MIDI Channel (0...15)
	uint16le midiProgram;      // MIDI Program (0...127)
	uint16le pitchWheelRange;  // MIDI Pitch Wheel Range (0...36 halftones)
	uint8le  muteComputer;     // Mute instrument if MIDI is enabled (0 / 1)
	uint8le  reserved[15];     // Reserved

	enum EnvType
	{
		EnvTypeVol,
		EnvTypePan,
	};
	// Convert OpenMPT's internal envelope representation to XM envelope data.
	void ConvertEnvelopeToXM(const InstrumentEnvelope &mptEnv, uint8le &numPoints, uint8le &flags, uint8le &sustain, uint8le &loopStart, uint8le &loopEnd, EnvType env);
	// Convert XM envelope data to an OpenMPT's internal envelope representation.
	void ConvertEnvelopeToMPT(InstrumentEnvelope &mptEnv, uint8 numPoints, uint8 flags, uint8 sustain, uint8 loopStart, uint8 loopEnd, EnvType env) const;

	struct SampleList
	{
		std::vector<SAMPLEINDEX> samples;  // The list of samples to write to the file
		bool tooManySamples = false;       // Does the source instrument contain more samples than what we can write?
	};

	// Convert OpenMPT's internal sample representation to an XMInstrument.
	SampleList ConvertToXM(const ModInstrument &mptIns, bool compatibilityExport);
	// Convert an XMInstrument to OpenMPT's internal instrument representation.
	void ConvertToMPT(ModInstrument &mptIns) const;
	// Apply auto-vibrato settings from sample to file.
	void ApplyAutoVibratoToXM(const ModSample &mptSmp, MODTYPE fromType);
	// Apply auto-vibrato settings from file to a sample.
	void ApplyAutoVibratoToMPT(ModSample &mptSmp) const;

	// Get a list of samples that should be written to the file.
	SampleList GetSampleList(const ModInstrument &mptIns, bool compatibilityExport) const;
};

MPT_BINARY_STRUCT(XMInstrument, 230)


// XM Instrument Header
struct XMInstrumentHeader
{
	uint32le size;              // Size of XMInstrumentHeader + XMInstrument
	char     name[22];          // Instrument Name, space-padded
	uint8le  type;              // Instrument Type (FT2 does not initialize this field properly, so it contains a random value, but it's the same random value for all instruments of the same module!)
	uint16le numSamples;        // Number of Samples associated with instrument
	uint32le sampleHeaderSize;  // Size of XMSample
	XMInstrument instrument;

	// Write stuff to the header that's always necessary (also for empty instruments)
	void Finalise();

	// Convert OpenMPT's internal sample representation to an XMInstrument.
	XMInstrument::SampleList ConvertToXM(const ModInstrument &mptIns, bool compatibilityExport);
	// Convert an XMInstrument to OpenMPT's internal instrument representation.
	void ConvertToMPT(ModInstrument &mptIns) const;
};

MPT_BINARY_STRUCT(XMInstrumentHeader, 263)


// XI Instrument Header
struct XIInstrumentHeader
{
	enum
	{
		fileVersion = 0x102,
	};

	char     signature[21];    // "Extended Instrument: "
	char     name[22];         // Instrument Name, space-padded
	uint8le  eof;              // DOS EOF Character (0x1A)
	char     trackerName[20];  // Software that was used to create the XI file
	uint16le version;          // File Version (1.02)
	XMInstrument instrument;
	uint16le numSamples;       // Number of embedded sample headers + samples

	// Convert OpenMPT's internal sample representation to an XIInstrumentHeader.
	XMInstrument::SampleList ConvertToXM(const ModInstrument &mptIns, bool compatibilityExport);
	// Convert an XIInstrumentHeader to OpenMPT's internal instrument representation.
	void ConvertToMPT(ModInstrument &mptIns) const;
};

MPT_BINARY_STRUCT(XIInstrumentHeader, 298)


// XM Sample Header
struct XMSample
{
	enum XMSampleFlags
	{
		sampleLoop     = 0x01,
		sampleBidiLoop = 0x02,
		sample16Bit    = 0x10,
		sampleStereo   = 0x20,
		sampleADPCM    = 0xAD,  // MODPlugin :(
	};

	uint32le length;      // Sample Length (in bytes)
	uint32le loopStart;   // Loop Start (in bytes)
	uint32le loopLength;  // Loop Length (in bytes)
	uint8le  vol;         // Default Volume
	int8le   finetune;    // Sample Finetune
	uint8le  flags;       // Sample Flags
	uint8le  pan;         // Sample Panning
	int8le   relnote;     // Sample Transpose
	uint8le  reserved;    // Reserved (abused for ModPlug's ADPCM compression)
	char     name[22];    // Sample Name, space-padded

	// Convert OpenMPT's internal sample representation to an XMSample.
	void ConvertToXM(const ModSample &mptSmp, MODTYPE fromType, bool compatibilityExport);
	// Convert an XMSample to OpenMPT's internal sample representation.
	void ConvertToMPT(ModSample &mptSmp) const;
	// Retrieve the internal sample format flags for this instrument.
	SampleIO GetSampleFormat() const;
};

MPT_BINARY_STRUCT(XMSample, 40)


OPENMPT_NAMESPACE_END
