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#pragma once
#include "nes/util/status.hh"
#include "nes/mapper.hh"
#include <cstddef>
#include <vector>
#include <string_view>
namespace nes
{
enum class name_table_arrangement
{
horizontal,
vertical,
};
class cartridge
{
static constexpr auto prg_rom_bank_size = std::size_t{ 16 * 1024 };
static constexpr auto chr_rom_bank_size = std::size_t{ 8 * 1024 };
static constexpr auto ram_bank_size = std::size_t{ 8 * 1024 };
static constexpr auto header_length = std::size_t{ 16 };
struct header
{
auto get_magic_0() const -> std::uint8_t { return value[0]; }
auto get_magic_1() const -> std::uint8_t { return value[1]; }
auto get_magic_2() const -> std::uint8_t { return value[2]; }
auto get_magic_3() const -> std::uint8_t { return value[3]; }
auto get_prg_rom_banks() const -> unsigned { return value[4]; }
auto get_chr_rom_banks() const -> unsigned { return value[5]; }
auto get_control_1() const -> std::uint8_t { return value[6]; }
auto get_control_2() const -> std::uint8_t { return value[7]; }
auto get_ram_banks() const -> unsigned { return value[8]; }
auto get_has_trainer() const -> bool { return get_control_1() & 0b00000100; }
auto get_mapper_low() const -> unsigned { return (get_control_1() & 0b11110000) >> 4; }
auto get_mapper_high() const -> unsigned { return (get_control_2() & 0b11110000) >> 0; }
auto get_name_table_arrangement() const -> name_table_arrangement { return static_cast<name_table_arrangement>((get_control_1() & 0b00000001) >> 0); }
std::uint8_t value[header_length]{};
explicit header(std::uint8_t const* v)
{
for (auto i = std::size_t{ 0 }; i < header_length; ++i)
{
value[i] = v[i];
}
}
};
status status_{ status::error_uninitialized };
std::vector<std::uint8_t> prg_rom_;
std::vector<std::uint8_t> chr_rom_;
std::vector<std::uint8_t> ram_;
name_table_arrangement name_table_arrangement_{};
mapper* mapper_{ &mapper::invalid() };
public:
explicit cartridge() = default;
static auto from_data(void const* data, std::size_t length) -> cartridge;
static auto from_file(std::string_view path) -> cartridge;
auto get_status() const -> status { return status_; }
auto get_prg_rom() const -> std::uint8_t const* { return prg_rom_.data(); }
auto get_prg_rom_length() const -> std::size_t { return prg_rom_.size(); }
auto get_chr_rom() const -> std::uint8_t const* { return chr_rom_.data(); }
auto get_chr_rom_length() const -> std::size_t { return chr_rom_.size(); }
auto get_ram() const -> std::uint8_t const* { return ram_.data(); }
auto get_ram_mut() -> std::uint8_t* { return ram_.data(); }
auto get_ram_length() const -> std::size_t { return ram_.size(); }
auto get_mapper() const -> mapper& { return *mapper_; }
auto get_name_table_arrangement() const -> name_table_arrangement { return name_table_arrangement_; }
private:
explicit cartridge(status);
};
} // namespace nes
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