namespace
{
	std::optional<HookParam> ParseRCode(std::wstring RCode)
	{
		RCode.erase(0, 1);
		std::wsmatch match;
		HookParam hp;
		hp.type |= DIRECT_READ;

		// {S|Q|V|M}
		switch (RCode[0])
		{
		case L'S':
			break;
		case L'Q':
			hp.type |= CODEC_UTF16;
			break;
		case L'U':
			hp.type |= CODEC_UTF32;
			break;
		case L'V':
			hp.type |= CODEC_UTF8;
			break;
		default:
			return {};
		}
		RCode.erase(0, 1);

		// [codepage#]
		if (std::regex_search(RCode, match, std::wregex(L"^([0-9]+)#")))
		{
			hp.codepage = std::stoi(match[1]);
			RCode.erase(0, match[0].length());
		}

		// @addr
		if (!std::regex_match(RCode, match, std::wregex(L"@([[:xdigit:]]+)")))
			return {};
		hp.address = std::stoull(match[1], nullptr, 16);
		return hp;
	}

	std::optional<HookParam> ParseHCode(std::wstring HCode, std::optional<HookParam> hpo = {})
	{
		auto hp = hpo ? hpo.value() : HookParam{};
		if (HCode[0] == 'L')
		{
			hp.type |= HOOK_RETURN;
			HCode.erase(0, 1);
		}
		switch (HCode[0])
		{
		case L'B':
			hp.type |= BREAK_POINT;
		case L'H':
			break;
		default:
			return {};
		}

		HCode.erase(0, 1);

		if (endWith(HCode, L":JIT:YUZU"))
			hp.jittype = JITTYPE::YUZU;
		else if (endWith(HCode, L":JIT:PPSSPP"))
			hp.jittype = JITTYPE::PPSSPP;
		else if (endWith(HCode, L":JIT:VITA3K"))
			hp.jittype = JITTYPE::VITA3K;
		else if (endWith(HCode, L":JIT:RPCS3"))
			hp.jittype = JITTYPE::RPCS3;
		else if (endWith(HCode, L":JIT:UNITY"))
			hp.jittype = JITTYPE::UNITY;

		// {A|B|W|H|S|Q|V|M}
		switch (HCode[0])
		{
		case L'A':
			hp.type |= CODEC_ANSI_BE;
			break;
		case L'B':
			// ANSI LE
			break;
		case L'W':
			hp.type |= CODEC_UTF16;
		case L'C':
			hp.type |= CODEC_UTF8;
			break;
		case L'I':
			hp.type |= CODEC_UTF32;
			break;
		case L'S':
			hp.type |= USING_STRING;
			break;
		case L'Q':
			hp.type |= USING_STRING | CODEC_UTF16;
			break;
		case L'M':
			hp.type |= USING_STRING | CODEC_UTF16 | SPECIAL_JIT_STRING;
			break;
		case L'U':
			hp.type |= USING_STRING | CODEC_UTF32;
			break;
		case L'V':
			hp.type |= USING_STRING | CODEC_UTF8;
			break;
		default:
			return {};
		}
		HCode.erase(0, 1);

		if (hp.type & USING_STRING)
		{
			if (HCode[0] == L'F')
			{
				hp.type |= FULL_STRING;
				HCode.erase(0, 1);
			}
		}

		// [N]
		if (HCode[0] == L'N')
		{
			hp.type |= NO_CONTEXT;
			HCode.erase(0, 1);
		}

		std::wsmatch match;
		// [codepage#]
		if (std::regex_search(HCode, match, std::wregex(L"^([0-9]+)#")))
		{
			hp.codepage = std::stoi(match[1]);
			HCode.erase(0, match[0].length());
		}

		// [padding+]
		if (std::regex_search(HCode, match, std::wregex(L"^([[:xdigit:]]+)\\+")))
		{
			hp.padding = std::stoll(match[1], nullptr, 16);
			HCode.erase(0, match[0].length());
		}

		auto ConsumeHexInt = [&HCode]
		{
			size_t size = 0;
			int value = 0;
			try
			{
				value = std::stoi(HCode, &size, 16);
			}
			catch (std::invalid_argument)
			{
			}
			HCode.erase(0, size);
			return value;
		};

		// data_offset
		hp.offset = ConsumeHexInt();

		// [*deref_offset1]
		if (HCode[0] == L'*')
		{
			hp.type |= DATA_INDIRECT;
			HCode.erase(0, 1);
			hp.index = ConsumeHexInt();
		}

		// [:split_offset[*deref_offset2]]
		if (HCode[0] == L':')
		{
			hp.type |= USING_SPLIT;
			HCode.erase(0, 1);
			hp.split = ConsumeHexInt();

			if (HCode[0] == L'*')
			{
				hp.type |= SPLIT_INDIRECT;
				HCode.erase(0, 1);
				hp.split_index = ConsumeHexInt();
			}
		}
		if (hp.jittype == JITTYPE::UNITY)
		{
			if (HCode[0] != L'@')
				return {};
			HCode.erase(0, 1);
			HCode = HCode.substr(0, HCode.size() - wcslen(L":JIT:UNITY"));
			hp.argidx = hp.offset;
			hp.offset = 0;
			hp.address = 0;
			hp.type &= ~MODULE_OFFSET;
			hp.type &= ~FUNCTION_OFFSET;
			strcpy(hp.function, "");
			wcscpy(hp.module, L"");
			strcpy(hp.unityfunctioninfo, wcasta(HCode).c_str());
		}
		else
		{

			// @addr[:module[:func]]
			if (!std::regex_match(HCode, match, std::wregex(L"^@([[:xdigit:]]+)(:.+?)?(:.+)?")))
				return {};
			hp.address = std::stoull(match[1], nullptr, 16);
			if (match[2].matched)
			{
				hp.type |= MODULE_OFFSET;
				wcsncpy_s(hp.module, match[2].str().erase(0, 1).c_str(), MAX_MODULE_SIZE - 1);
			}
			if (match[3].matched)
			{
				hp.type |= FUNCTION_OFFSET;
				std::wstring func = match[3];
				strncpy_s(hp.function, std::string(func.begin(), func.end()).erase(0, 1).c_str(), MAX_MODULE_SIZE - 1);
			}

			// ITH has registers offset by 4 vs AGTH: need this to correct
			if (hp.offset < 0)
				hp.offset -= 4;
			if (hp.split < 0)
				hp.split -= 4;

			if (hp.jittype != JITTYPE::PC)
			{
				hp.emu_addr = hp.address;
				hp.argidx = hp.offset;
				hp.offset = 0;
				hp.address = 0;
				hp.type &= ~MODULE_OFFSET;
				hp.type &= ~FUNCTION_OFFSET;
				strcpy(hp.function, "");
				wcscpy(hp.module, L"");
			}
		}
		return hp;
	}

	std::optional<HookParam> ParseECode(std::wstring code)
	{
		code.erase(0, 1);
		HookParam hp;
		hp.type |= EMBED_ABLE;

		if (code[0] == L'D')
		{
			hp.type |= EMBED_DYNA_SJIS;
			code.erase(0, 1);
		}
		if (code[0] == L'S')
		{
			code.erase(0, 1);
			hp.type |= EMBED_BEFORE_SIMPLE;

			if (code[0] == L'N')
				hp.type |= EMBED_AFTER_NEW;
			else if (code[0] == L'O')
				hp.type |= EMBED_AFTER_OVERWRITE;
			else
				return ParseHCode(code, hp);
			code.erase(0, 1);
		}

		return ParseHCode(code, hp);
	}
	std::wstring HexString(int64_t num)
	{
		if (num < 0)
			return FormatString(L"-%I64X", -num);
		return FormatString(L"%I64X", num);
	}

	std::wstring GenerateRCode(HookParam hp)
	{
		std::wstring RCode = L"R";

		if (hp.type & CODEC_UTF16)
			RCode += L'Q';
		else if (hp.type & CODEC_UTF32)
			RCode += L'U';
		else if (hp.type & CODEC_UTF8)
			RCode += L'V';
		else
		{
			RCode += L'S';
			if (hp.codepage != 0)
				RCode += std::to_wstring(hp.codepage) + L'#';
		}

		RCode += L'@' + HexString(hp.address);

		return RCode;
	}

	std::wstring GenerateHCode(HookParam hp, DWORD processId)
	{
		std::wstring HCode;
		if (hp.type & EMBED_ABLE)
		{
			HCode += L"E";

			if (hp.hook_before || hp.hook_after)
				HCode += L'X';
			else
			{
				if (hp.type & EMBED_DYNA_SJIS)
					HCode += L"D";
				if (hp.type & EMBED_BEFORE_SIMPLE)
					HCode += L"S";

				if (hp.type & EMBED_AFTER_NEW)
					HCode += L"N";
				else if (hp.type & EMBED_AFTER_OVERWRITE)
					HCode += L"O";
			}
		}
		if (hp.type & BREAK_POINT)
			HCode += L"B";
		else
			HCode += L"H";

		if (hp.type & USING_STRING)
		{
			if (hp.type & SPECIAL_JIT_STRING)
				HCode += L'M';
			else if (hp.type & CODEC_UTF16)
				HCode += L'Q';
			else if (hp.type & CODEC_UTF8)
				HCode += L'V';
			else if (hp.type & CODEC_UTF32)
				HCode += L'U';
			else
				HCode += L'S';
		}
		else
		{
			if (hp.type & CODEC_UTF16)
				HCode += L'W';
			else if (hp.type & CODEC_UTF8)
				HCode += L'C';
			else if (hp.type & CODEC_UTF32)
				HCode += L'I';
			else if (hp.type & CODEC_ANSI_BE)
				HCode += L'A';
			else
				HCode += L'B';
		}

		if (hp.text_fun || hp.filter_fun)
			HCode += L'X';

		if (hp.type & FULL_STRING)
			HCode += L'F';

		if (hp.type & NO_CONTEXT)
			HCode += L'N';

		if (hp.codepage != 0 && !(hp.type & CODEC_UTF8) && !(hp.type & CODEC_UTF16) && !(hp.type & CODEC_UTF32))
			HCode += std::to_wstring(hp.codepage) + L'#';

		if (hp.padding)
			HCode += HexString(hp.padding) + L'+';

		if (hp.offset < 0)
			hp.offset += 4;
		if (hp.split < 0)
			hp.split += 4;

		if (hp.jittype == JITTYPE::PC)
		{
			HCode += HexString(hp.offset);
		}
		else
		{
			HCode += HexString(hp.argidx);
		}

		if (hp.type & DATA_INDIRECT)
			HCode += L'*' + HexString(hp.index);
		if (hp.type & USING_SPLIT)
			HCode += L':' + HexString(hp.split);
		if (hp.type & SPLIT_INDIRECT)
			HCode += L'*' + HexString(hp.split_index);

		// Attempt to make the address relative
		if (hp.jittype == JITTYPE::PC)
		{
			if (processId && !(hp.type & MODULE_OFFSET))
				if (AutoHandle<> process = OpenProcess(PROCESS_VM_READ | PROCESS_QUERY_INFORMATION, FALSE, processId))
					if (MEMORY_BASIC_INFORMATION info = {}; VirtualQueryEx(process, (LPCVOID)hp.address, &info, sizeof(info)))
						if (auto moduleName = getModuleFilename(processId, (HMODULE)info.AllocationBase))
						{
							hp.type |= MODULE_OFFSET;
							hp.address -= (uint64_t)info.AllocationBase;
							wcsncpy_s(hp.module, moduleName->c_str() + moduleName->rfind(L'\\') + 1, MAX_MODULE_SIZE - 1);
						}

			HCode += L'@' + HexString(hp.address);
			if (hp.type & MODULE_OFFSET)
				HCode += L':' + std::wstring(hp.module);
			if (hp.type & FUNCTION_OFFSET)
				HCode += L':' + acastw(hp.function);
		}
		else
		{
			if (hp.jittype == JITTYPE::UNITY)
			{
				HCode += L'@';
				HCode += acastw(hp.unityfunctioninfo);
				HCode += L":JIT:UNITY";
			}
			else
			{

				HCode += L'@' + HexString(hp.emu_addr);
				switch (hp.jittype)
				{
				case JITTYPE::YUZU:
					HCode += L":JIT:YUZU";
					break;
				case JITTYPE::PPSSPP:
					HCode += L":JIT:PPSSPP";
					break;
				case JITTYPE::VITA3K:
					HCode += L":JIT:VITA3K";
					break;
				case JITTYPE::RPCS3:
					HCode += L":JIT:RPCS3";
					break;
				}
			}
		}

		return HCode;
	}
}

namespace HookCode
{
	std::optional<HookParam> Parse(std::wstring code)
	{
		if (code[0] == L'/')
			code.erase(0, 1);
		code.erase(std::find(code.begin(), code.end(), L'/'), code.end()); // legacy/AGTH compatibility
		Trim(code);
		if (code[0] == L'R')
			return ParseRCode(code);
		else if (code[0] == L'E')
			return ParseECode(code);
		else
			return ParseHCode(code);
	}

	std::wstring Generate(HookParam hp, DWORD processId)
	{
		std::wstring HCode = L"";
		return HCode += (hp.type & DIRECT_READ ? GenerateRCode(hp) : GenerateHCode(hp, processId));
	}

}