//
// Created by Selim Mustafaev on 09.08.2023.
//

#ifndef NES_CARTRIDGE_H
#define NES_CARTRIDGE_H

#include "Mapper/Mapper0.h"

#include <filesystem>
#include <memory>
#include <span>

namespace nes {

    namespace fs = std::filesystem;

    constexpr uint32_t ROM_MAGIC = 0x4E45531A;
    constexpr size_t PRG_CHUNK_SIZE = 16*1024;
    constexpr size_t CHR_CHUNK_SIZE = 8*1024;

    class Cartridge {
    public:
        enum Mirroring {
            Horizontal,
            Vertical
        };

        struct Flags {
            uint8_t mirroring: 1;
            uint8_t reserved: 7;
        };

        struct RomHeader {
            uint32_t magic;
            uint8_t prgChunks;
            uint8_t chrChunks;
            Flags flags;
            uint8_t reserved[9];
        };

    public:
        explicit Cartridge(const fs::path& path);

    public:
        uint8_t readPrg(uint16_t address);
        uint8_t readChr(uint16_t address);
        Mirroring mirroring() const;

    private:
        std::unique_ptr<uint8_t[]> _romData;
        std::unique_ptr<Mapper> _mapper;
        RomHeader* _header;
        std::span<uint8_t> _prgRom;
        std::span<uint8_t> _chrRom;
        
    private:
        Mirroring _mirroring;
    };

}

#endif //NES_CARTRIDGE_H