#include "RomMSXDOS2.hh"

#include "CacheLine.hh"
#include "MSXException.hh"

#include "one_of.hh"
#include "unreachable.hh"

namespace openmsx {

RomMSXDOS2::RomMSXDOS2(const DeviceConfig& config, Rom&& rom_)
	: Rom16kBBlocks(config, std::move(rom_))
	, range(rom[0x94])
{
	if (range != one_of(0x00, 0x60, 0x7f)) {
		throw MSXException(
			"Invalid rom with for MSXDOS2 mapper: unsupported range 0x",
			hex_string<2>(range));
	}
	reset(EmuTime::dummy());
}

void RomMSXDOS2::reset(EmuTime /*time*/)
{
	setUnmapped(0);
	setRom(1, 0);
	setUnmapped(2);
	setUnmapped(3);
}

void RomMSXDOS2::writeMem(uint16_t address, byte value, EmuTime /*time*/)
{
	switch (range) {
	case 0x00:
		if (address != 0x7ff0) return;
		break;
	case 0x60:
		if ((address & 0xf000) != 0x6000) return;
		break;
	case 0x7f:
		if (address != 0x7ffe) return;
		break;
	default:
		UNREACHABLE;
	}
	setRom(1, value);
}

byte* RomMSXDOS2::getWriteCacheLine(uint16_t address)
{
	switch (range) {
	case 0x00:
		if (address == (0x7ff0 & CacheLine::HIGH)) return nullptr;
		break;
	case 0x60:
		if ((address & 0xf000) == 0x6000) return nullptr;
		break;
	case 0x7f:
		if (address == (0x7ffe & CacheLine::HIGH)) return nullptr;
		break;
	default:
		UNREACHABLE;
	}
	return unmappedWrite.data();
}

REGISTER_MSXDEVICE(RomMSXDOS2, "RomMSXDOS2");

} // namespace openmsx