#pragma once

#include "reader.h"
#include "image.h"
#include "zlib.h"
#include <cstddef>
#include <cstdint>
#include <map>
#include <memory>
#include <string>
#include <vector>

#define CHUNK_READER(X) void X(uint32_t chunkSize)
#define REGISTER_CHUNK_READER(X) chunkReaders.insert({#X, &PNGImage::X})
#define DEFINE_CHUNK_READER(X) void PNGImage::X(uint32_t chunkSize)

class PNGImage : public Image
{
private:
	ZLibInflator zlib;
	uint8_t* idatData;
	unsigned long idatDataSize;
public:
	PNGImage();
	~PNGImage();

	// template<std::derived_from<Image> T> PNGImage(const T& other) : Image(other) { }
	PNGImage(const Image& other) : Image(other) {}

	int readFromFile(std::string filename) override;
	int writeToFile(std::string filename) override;
	
	// sRGB
	uint8_t renderingIntent;

	// pHYs
	uint32_t pixelsPerX;
	uint32_t pixelsPerY;
	uint8_t unit;

	// tIME
	uint16_t year;
	uint8_t month;
	uint8_t day;
	uint8_t hour;
	uint8_t minute;
	uint8_t second;

	bool readNextChunk();
	
private:
	std::map<std::string, void(PNGImage::*)(uint32_t chunkSize)> chunkReaders;
	CHUNK_READER(IHDR);
	CHUNK_READER(iCCP);
	CHUNK_READER(sRGB);
	CHUNK_READER(eXIf);
	CHUNK_READER(iDOT);
	CHUNK_READER(pHYs);
	CHUNK_READER(tIME);
	CHUNK_READER(tEXt);
	CHUNK_READER(IDAT);
	CHUNK_READER(IEND);

	bool end = false;

	Reader *reader;
};