// SPDX-FileCopyrightText: 2002-2026 PCSX2 Dev Team
// SPDX-License-Identifier: GPL-3.0+

#include "Assertions.h"
#include "StringUtil.h"

#include <cctype>
#include <codecvt>
#include <cstdio>
#include <sstream>
#include <algorithm>

#include "fmt/format.h"

#ifdef _WIN32
#include "RedtapeWindows.h"
#endif

namespace StringUtil
{
	std::string StdStringFromFormat(const char* format, ...)
	{
		std::va_list ap;
		va_start(ap, format);
		std::string ret = StdStringFromFormatV(format, ap);
		va_end(ap);
		return ret;
	}

	std::string StdStringFromFormatV(const char* format, std::va_list ap)
	{
		std::va_list ap_copy;
		va_copy(ap_copy, ap);

#ifdef _WIN32
		int len = _vscprintf(format, ap_copy);
#else
		int len = std::vsnprintf(nullptr, 0, format, ap_copy);
#endif
		va_end(ap_copy);

		std::string ret;

		// If an encoding error occurs, len is -1. Which we definitely don't want to resize to.
		if (len > 0)
		{
			ret.resize(len);
			std::vsnprintf(ret.data(), ret.size() + 1, format, ap);
		}

		return ret;
	}

	bool WildcardMatch(const char* subject, const char* mask, bool case_sensitive /*= true*/)
	{
		if (case_sensitive)
		{
			const char* cp = nullptr;
			const char* mp = nullptr;

			while ((*subject) && (*mask != '*'))
			{
				if ((*mask != '?') && (std::tolower(*mask) != std::tolower(*subject)))
					return false;

				mask++;
				subject++;
			}

			while (*subject)
			{
				if (*mask == '*')
				{
					if (*++mask == 0)
						return true;

					mp = mask;
					cp = subject + 1;
				}
				else
				{
					if ((*mask == '?') || (std::tolower(*mask) == std::tolower(*subject)))
					{
						mask++;
						subject++;
					}
					else
					{
						mask = mp;
						subject = cp++;
					}
				}
			}

			while (*mask == '*')
			{
				mask++;
			}

			return *mask == 0;
		}
		else
		{
			const char* cp = nullptr;
			const char* mp = nullptr;

			while ((*subject) && (*mask != '*'))
			{
				if ((*mask != *subject) && (*mask != '?'))
					return false;

				mask++;
				subject++;
			}

			while (*subject)
			{
				if (*mask == '*')
				{
					if (*++mask == 0)
						return true;

					mp = mask;
					cp = subject + 1;
				}
				else
				{
					if ((*mask == *subject) || (*mask == '?'))
					{
						mask++;
						subject++;
					}
					else
					{
						mask = mp;
						subject = cp++;
					}
				}
			}

			while (*mask == '*')
			{
				mask++;
			}

			return *mask == 0;
		}
	}

	std::size_t Strlcpy(char* dst, const char* src, std::size_t size)
	{
		std::size_t len = std::strlen(src);
		if (len < size)
		{
			std::memcpy(dst, src, len + 1);
		}
		else
		{
			std::memcpy(dst, src, size - 1);
			dst[size - 1] = '\0';
		}
		return len;
	}

	std::size_t Strlcpy(char* dst, const std::string_view src, std::size_t size)
	{
		std::size_t len = src.length();
		if (len < size)
		{
			std::memcpy(dst, src.data(), len);
			dst[len] = '\0';
		}
		else
		{
			std::memcpy(dst, src.data(), size - 1);
			dst[size - 1] = '\0';
		}
		return len;
	}

	std::optional<std::vector<u8>> DecodeHex(const std::string_view in)
	{
		std::vector<u8> data;
		data.reserve(in.size() / 2);

		for (size_t i = 0; i < in.size() / 2; i++)
		{
			std::optional<u8> byte = StringUtil::FromChars<u8>(in.substr(i * 2, 2), 16);
			if (byte.has_value())
				data.push_back(*byte);
			else
				return std::nullopt;
		}

		return {data};
	}

	std::string EncodeHex(const u8* data, int length)
	{
		std::stringstream ss;
		for (int i = 0; i < length; i++)
			ss << std::hex << std::setfill('0') << std::setw(2) << static_cast<int>(data[i]);

		return ss.str();
	}

	std::string toLower(const std::string_view input)
	{
		std::string newStr;
		std::transform(input.begin(), input.end(), std::back_inserter(newStr),
			[](unsigned char c) { return std::tolower(c); });
		return newStr;
	}

	std::string toUpper(const std::string_view input)
	{
		std::string newStr;
		std::transform(input.begin(), input.end(), std::back_inserter(newStr),
			[](unsigned char c) { return std::toupper(c); });
		return newStr;
	}

	bool compareNoCase(const std::string_view str1, const std::string_view str2)
	{
		if (str1.length() != str2.length())
		{
			return false;
		}
		return Strncasecmp(str1.data(), str2.data(), str1.length()) == 0;
	}

	std::vector<std::string> splitOnNewLine(const std::string& str)
	{
		std::vector<std::string> lines;
		std::istringstream stream(str);
		std::string line;
		while (std::getline(stream, line))
		{
			lines.push_back(line);
		}
		return lines;
	}

	std::string_view StripWhitespace(const std::string_view str)
	{
		std::string_view::size_type start = 0;
		while (start < str.size() && std::isspace(str[start]))
			start++;
		if (start == str.size())
			return {};

		std::string_view::size_type end = str.size() - 1;
		while (end > start && std::isspace(str[end]))
			end--;

		return str.substr(start, end - start + 1);
	}

	void StripWhitespace(std::string* str)
	{
		{
			const char* cstr = str->c_str();
			std::string_view::size_type start = 0;
			while (start < str->size() && std::isspace(cstr[start]))
				start++;
			if (start != 0)
				str->erase(0, start);
		}

		{
			const char* cstr = str->c_str();
			std::string_view::size_type start = str->size();
			while (start > 0 && std::isspace(cstr[start - 1]))
				start--;
			if (start != str->size())
				str->erase(start);
		}
	}

	std::vector<std::string_view> SplitString(const std::string_view str, char delimiter, bool skip_empty /*= true*/)
	{
		std::vector<std::string_view> res;
		std::string_view::size_type last_pos = 0;
		std::string_view::size_type pos;
		while (last_pos < str.size() && (pos = str.find(delimiter, last_pos)) != std::string_view::npos)
		{
			std::string_view part(StripWhitespace(str.substr(last_pos, pos - last_pos)));
			if (!skip_empty || !part.empty())
				res.push_back(std::move(part));

			last_pos = pos + 1;
		}

		if (last_pos < str.size())
		{
			std::string_view part(StripWhitespace(str.substr(last_pos)));
			if (!skip_empty || !part.empty())
				res.push_back(std::move(part));
		}

		return res;
	}

	std::string ReplaceAll(const std::string_view subject, const std::string_view search, const std::string_view replacement)
	{
		std::string ret(subject);
		ReplaceAll(&ret, search, replacement);
		return ret;
	}

	void ReplaceAll(std::string* subject, const std::string_view search, const std::string_view replacement)
	{
		if (!subject->empty())
		{
			std::string::size_type start_pos = 0;
			while ((start_pos = subject->find(search, start_pos)) != std::string::npos)
			{
				subject->replace(start_pos, search.length(), replacement);
				start_pos += replacement.length();
			}
		}
	}

	bool ParseAssignmentString(const std::string_view str, std::string_view* key, std::string_view* value)
	{
		const std::string_view::size_type pos = str.find('=');
		if (pos == std::string_view::npos)
		{
			*key = std::string_view();
			*value = std::string_view();
			return false;
		}

		*key = StripWhitespace(str.substr(0, pos));
		if (pos != (str.size() - 1))
			*value = StripWhitespace(str.substr(pos + 1));
		else
			*value = std::string_view();

		return true;
	}

	void AppendUTF16CharacterToUTF8(std::string& s, u16 ch)
	{
		if (ch & 0xf800)
		{
			s.push_back(static_cast<char>(static_cast<u8>(0xe0 | static_cast<u8>(ch >> 12))));
			s.push_back(static_cast<char>(static_cast<u8>(0x80 | static_cast<u8>(((ch >> 6) & 0x3f)))));
			s.push_back(static_cast<char>(static_cast<u8>(0x80 | static_cast<u8>((ch & 0x3f)))));
		}
		else if (ch & 0xff80)
		{
			s.push_back(static_cast<char>(static_cast<u8>(0xc0 | static_cast<u8>((ch >> 6)))));
			s.push_back(static_cast<char>(static_cast<u8>(0x80 | static_cast<u8>((ch & 0x3f)))));
		}
		else
		{
			s.push_back(static_cast<char>(static_cast<u8>(ch)));
		}
	}

	void EncodeAndAppendUTF8(std::string& s, char32_t ch)
	{
		if (ch <= 0x7F)
		{
			s.push_back(static_cast<char>(static_cast<u8>(ch)));
		}
		else if (ch <= 0x07FF)
		{
			s.push_back(static_cast<char>(static_cast<u8>(0xc0 | static_cast<u8>((ch >> 6) & 0x1f))));
			s.push_back(static_cast<char>(static_cast<u8>(0x80 | static_cast<u8>((ch & 0x3f)))));
		}
		else if (ch <= 0xFFFF)
		{
			s.push_back(static_cast<char>(static_cast<u8>(0xe0 | static_cast<u8>(((ch >> 12) & 0x0f)))));
			s.push_back(static_cast<char>(static_cast<u8>(0x80 | static_cast<u8>(((ch >> 6) & 0x3f)))));
			s.push_back(static_cast<char>(static_cast<u8>(0x80 | static_cast<u8>((ch & 0x3f)))));
		}
		else if (ch <= 0x10FFFF)
		{
			s.push_back(static_cast<char>(static_cast<u8>(0xf0 | static_cast<u8>(((ch >> 18) & 0x07)))));
			s.push_back(static_cast<char>(static_cast<u8>(0x80 | static_cast<u8>(((ch >> 12) & 0x3f)))));
			s.push_back(static_cast<char>(static_cast<u8>(0x80 | static_cast<u8>(((ch >> 6) & 0x3f)))));
			s.push_back(static_cast<char>(static_cast<u8>(0x80 | static_cast<u8>((ch & 0x3f)))));
		}
		else
		{
			s.push_back(static_cast<char>(0xefu));
			s.push_back(static_cast<char>(0xbfu));
			s.push_back(static_cast<char>(0xbdu));
		}
	}

	size_t DecodeUTF8(const void* bytes, size_t length, char32_t* ch)
	{
		const u8* s = reinterpret_cast<const u8*>(bytes);
		if (s[0] < 0x80)
		{
			*ch = s[0];
			return 1;
		}
		else if ((s[0] & 0xe0) == 0xc0)
		{
			if (length < 2)
				goto invalid;

			*ch = static_cast<char32_t>((static_cast<u32>(s[0] & 0x1f) << 6) | (static_cast<u32>(s[1] & 0x3f) << 0));
			return 2;
		}
		else if ((s[0] & 0xf0) == 0xe0)
		{
			if (length < 3)
				goto invalid;

			*ch = static_cast<char32_t>((static_cast<u32>(s[0] & 0x0f) << 12) | (static_cast<u32>(s[1] & 0x3f) << 6) |
										(static_cast<u32>(s[2] & 0x3f) << 0));
			return 3;
		}
		else if ((s[0] & 0xf8) == 0xf0 && (s[0] <= 0xf4))
		{
			if (length < 4)
				goto invalid;

			*ch = static_cast<char32_t>((static_cast<u32>(s[0] & 0x07) << 18) | (static_cast<u32>(s[1] & 0x3f) << 12) |
										(static_cast<u32>(s[2] & 0x3f) << 6) | (static_cast<u32>(s[3] & 0x3f) << 0));
			return 4;
		}

	invalid:
		*ch = 0xFFFFFFFFu;
		return 1;
	}

	size_t DecodeUTF8(const std::string_view str, size_t offset, char32_t* ch)
	{
		return DecodeUTF8(str.data() + offset, str.length() - offset, ch);
	}

	size_t DecodeUTF8(const std::string& str, size_t offset, char32_t* ch)
	{
		return DecodeUTF8(str.data() + offset, str.length() - offset, ch);
	}

	std::string Ellipsise(const std::string_view str, u32 max_length, const char* ellipsis /*= "..."*/)
	{
		std::string ret;
		ret.reserve(max_length);

		const u32 str_length = static_cast<u32>(str.length());
		const u32 ellipsis_len = static_cast<u32>(std::strlen(ellipsis));
		pxAssert(ellipsis_len > 0 && ellipsis_len <= max_length);

		if (str_length > max_length)
		{
			const u32 copy_size = std::min(str_length, max_length - ellipsis_len);
			if (copy_size > 0)
				ret.append(str.data(), copy_size);
			if (copy_size != str_length)
				ret.append(ellipsis);
		}
		else
		{
			ret.append(str);
		}

		return ret;
	}

	void EllipsiseInPlace(std::string& str, u32 max_length, const char* ellipsis /*= "..."*/)
	{
		const u32 str_length = static_cast<u32>(str.length());
		const u32 ellipsis_len = static_cast<u32>(std::strlen(ellipsis));
		pxAssert(ellipsis_len > 0 && ellipsis_len <= max_length);

		if (str_length > max_length)
		{
			const u32 keep_size = std::min(static_cast<u32>(str.length()), max_length - ellipsis_len);
			if (keep_size != str_length)
				str.erase(keep_size);

			str.append(ellipsis);
		}
	}

#ifdef _WIN32
	std::wstring UTF8StringToWideString(const std::string_view str)
	{
		std::wstring ret;
		if (!UTF8StringToWideString(ret, str))
			return {};

		return ret;
	}

	bool UTF8StringToWideString(std::wstring& dest, const std::string_view str)
	{
		int wlen = MultiByteToWideChar(CP_UTF8, 0, str.data(), static_cast<int>(str.length()), nullptr, 0);
		if (wlen < 0)
			return false;

		dest.resize(wlen);
		if (wlen > 0 && MultiByteToWideChar(CP_UTF8, 0, str.data(), static_cast<int>(str.length()), dest.data(), wlen) < 0)
			return false;

		return true;
	}

	std::string WideStringToUTF8String(const std::wstring_view& str)
	{
		std::string ret;
		if (!WideStringToUTF8String(ret, str))
			ret.clear();

		return ret;
	}

	bool WideStringToUTF8String(std::string& dest, const std::wstring_view& str)
	{
		int mblen = WideCharToMultiByte(CP_UTF8, 0, str.data(), static_cast<int>(str.length()), nullptr, 0, nullptr, nullptr);
		if (mblen < 0)
			return false;

		dest.resize(mblen);
		if (mblen > 0 && WideCharToMultiByte(CP_UTF8, 0, str.data(), static_cast<int>(str.length()), dest.data(), mblen,
							 nullptr, nullptr) < 0)
		{
			return false;
		}

		return true;
	}
#endif

	std::string U128ToString(const u128& u)
	{
		return fmt::format("0x{:08X}.{:08X}.{:08X}.{:08X}", u._u32[0], u._u32[1], u._u32[2], u._u32[3]);
	}

	std::string& AppendU128ToString(const u128& u, std::string& s)
	{
		fmt::format_to(std::back_inserter(s), "0x{:08X}.{:08X}.{:08X}.{:08X}", u._u32[0], u._u32[1], u._u32[2], u._u32[3]);
		return s;
	}
} // namespace StringUtil
