#ifndef MSXCHAR2UNICODE_HH

#define MSXCHAR2UNICODE_HH

#include <array>

#include <cstdint>

#include <functional>

#include <span>

#include <string>

#include <string_view>

#include <vector>

namespace openmsx {

class MsxChar2Unicode

{

public:

	explicit MsxChar2Unicode(std::string_view mappingName);

	/** TODO */

	[[nodiscard]] std::string msxToUtf8(

		std::span<const uint8_t> msx,

		const std::function<uint32_t(uint8_t)>& fallback) const;

	/** TODO */

	[[nodiscard]] std::vector<uint8_t> utf8ToMsx(

		std::string_view utf8,

		const std::function<uint8_t(uint32_t)>& fallback) const;

	[[nodiscard]] std::string msxToUtf8(std::span<const uint8_t> msx, char fallback) const;

	[[nodiscard]] std::vector<uint8_t> utf8ToMsx(std::string_view utf8, char fallback) const;

private:

	void parseVid(std::string_view file);

private:

	// LUT: msx graphical character code (as stored in VRAM) -> unicode character

	// Some entries are not filled in (are invalid), they contain the value -1.

	// There may be different (valid) entries that contain the same value.

	std::array<uint32_t, 256> msx2unicode;

	// Reverse LUT: unicode character -> msx graphical character

	struct Entry {

		Entry(uint32_t u, uint8_t m) : unicode(u), msx(m) {}

		uint32_t unicode;

		uint8_t msx;

	};

	// Sorted on Entry::unicode. All 'unicode' fields are unique, but

	// there can be different entries that have the same 'msx' field.

	std::vector<Entry> unicode2msx;

};

} // namespace openmsx

#endif