
/*
 * Copyright 2011-2022 Cuberite Contributors
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

// StringUtils.h

// Interfaces to various string helper functions




#pragma once

typedef std::string AString;
typedef std::vector<AString> AStringVector;
typedef std::list<AString>   AStringList;

/** A string dictionary, used for key-value pairs. */
typedef std::map<AString, AString> AStringMap;





/** Split the string at any of the listed delimiters.
Return the splitted strings as a stringvector. */
extern AStringVector StringSplit(const AString & str, const AString & delim);

/** Split the string at any of the listed delimiters. Keeps quoted content together
Resolves issue #490
Return the splitted strings as a stringvector. */
extern AStringVector StringSplitWithQuotes(const AString & str, const AString & delim);

/** Join a list of strings with the given delimiter between entries. */
AString StringJoin(const AStringVector & a_Strings, const AString & a_Delimiter);

/** Split the string at any of the listed delimiters and trim each value.
Returns the splitted strings as a stringvector. */
extern AStringVector StringSplitAndTrim(const AString & str, const AString & delim);

/** Trims whitespace at both ends of the string.
Returns a trimmed copy of the original string. */
extern AString TrimString(const AString & str);  // tolua_export

/** In-place string conversion to uppercase.
Returns the same string object. */
extern AString & InPlaceUppercase(AString & s);

/** In-place string conversion to lowercase.
Returns the same string object. */
extern AString & InPlaceLowercase(AString & s);

/** Returns an upper-cased copy of the string */
extern AString StrToUpper(const AString & s);

/** Returns a lower-cased copy of the string */
extern AString StrToLower(const AString & s);

/** Case-insensitive string comparison.
Returns 0 if the strings are the same, <0 if s1 < s2 and >0 if s1 > s2. */
extern int NoCaseCompare(const AString & s1, const AString & s2);  // tolua_export

/** Case-insensitive string comparison that returns a rating of equal-ness between [0 - s1.length()]. */
extern size_t RateCompareString(const AString & s1, const AString & s2);

/** Replaces each occurence of iNeedle in iHayStack with iReplaceWith */
extern void ReplaceString(AString & iHayStack, const AString & iNeedle, const AString & iReplaceWith);  // tolua_export

/** Replaces each occurence of iNeedle in iHayStack with iReplaceWith, after URL-encoding iReplaceWith */
extern void ReplaceURL(AString & iHayStack, const AString & iNeedle, const AString & iReplaceWith);

/** Converts a stream of BE shorts into UTF-8 string; returns a_UTF8. */
extern AString & RawBEToUTF8(const char * a_RawData, size_t a_NumShorts, AString & a_UTF8);

/** Converts a unicode character to its UTF8 representation. */
extern AString UnicodeCharToUtf8(unsigned a_UnicodeChar);

/** Converts a UTF-8 string into a UTF-16 BE string. */
extern std::u16string UTF8ToRawBEUTF16(const AString & a_String);

/** Creates a nicely formatted HEX dump of the given memory block. */
extern AString & CreateHexDump(AString & a_Out, const void * a_Data, size_t a_Size, size_t a_BytesPerLine);

/** Returns a copy of a_Message with all quotes and backslashes escaped by a backslash. */
extern AString EscapeString(const AString & a_Message);  // tolua_export

/** Removes all control codes used by MC for colors and styles. */
extern AString StripColorCodes(const AString & a_Message);  // tolua_export

/** URL-Decodes the given string.
The first value specifies whether the decoding was successful.
The second value is the decoded string, if successful. */
extern std::pair<bool, AString> URLDecode(const AString & a_String);  // Exported to Lua as cUrlParser::UrlDecode()

/** URL-encodes the given string. */
extern AString URLEncode(const AString & a_Text);

/** Replaces all occurrences of char a_From inside a_String with char a_To. */
extern AString ReplaceAllCharOccurrences(const AString & a_String, char a_From, char a_To);  // Needn't export to Lua, since Lua doesn't have chars anyway

/** Decodes a Base64-encoded string into the raw data */
extern AString Base64Decode(const AString & a_Base64String);  // Exported manually due to embedded NULs and extra parameter

/** Encodes a string into Base64 */
extern AString Base64Encode(const AString & a_Input);  // Exported manually due to embedded NULs and extra parameter

/** Reads two bytes from the specified memory location and interprets them as BigEndian short */
extern short GetBEShort(const std::byte * a_Mem);

/** Reads two bytes from the specified memory location and interprets them as BigEndian unsigned short */
extern unsigned short GetBEUShort(const char * a_Mem);

/** Reads four bytes from the specified memory location and interprets them as BigEndian int */
extern int GetBEInt(const std::byte * a_Mem);

/** Writes four bytes to the specified memory location so that they interpret as BigEndian int */
extern void SetBEInt(std::byte * a_Mem, Int32 a_Value);

/** Splits a string that has embedded \0 characters, on those characters.
a_Output is first cleared and then each separate string is pushed back into a_Output.
Returns true if there are at least two strings in a_Output (there was at least one \0 separator). */
extern bool SplitZeroTerminatedStrings(const AString & a_Strings, AStringVector & a_Output);

/** Merges the two vectors of strings, removing duplicate entries from the second vector.
The resulting vector contains items from a_Strings1 first, then from a_Strings2.
The order of items doesn't change, only the duplicates are removed.
If a_Strings1 contains duplicates, the result will still contain those duplicates. */
extern AStringVector MergeStringVectors(const AStringVector & a_Strings1, const AStringVector & a_Strings2);

/** Concatenates the specified strings into a single string, separated by the specified separator character.
Use StringJoin() if you need multiple separator characters. */
extern AString StringsConcat(const AStringVector & a_Strings, char a_Separator);

/** Converts a string into a float. Returns false if the conversion fails. */
extern bool StringToFloat(const AString & a_String, float & a_Num);

/** Returns true if only whitespace characters are present in the string */
bool IsOnlyWhitespace(const AString & a_String);





/** Parses any integer type. Checks bounds and returns errors out of band. */
template <class T>
bool StringToInteger(const AString & a_str, T & a_Num)
{
	size_t i = 0;
	bool positive = true;
	T result = 0;
	if (a_str[0] == '+')
	{
		i++;
	}
	else if (a_str[0] == '-')
	{
		i++;
		positive = false;
	}
	if (positive)
	{
		for (size_t size = a_str.size(); i < size; i++)
		{
			if ((a_str[i] < '0') || (a_str[i] > '9'))
			{
				return false;
			}
			if (std::numeric_limits<T>::max() / 10 < result)
			{
				return false;
			}
			result *= 10;
			T digit = static_cast<T>(a_str[i] - '0');
			if (std::numeric_limits<T>::max() - digit < result)
			{
				return false;
			}
			result += digit;
		}
	}
	else
	{
		// Unsigned result cannot be signed!
		if (!std::numeric_limits<T>::is_signed)
		{
			return false;
		}

		for (size_t size = a_str.size(); i < size; i++)
		{
			if ((a_str[i] < '0') || (a_str[i] > '9'))
			{
				return false;
			}
			if (std::numeric_limits<T>::min() / 10 > result)
			{
				return false;
			}
			result *= 10;
			T digit = static_cast<T>(a_str[i] - '0');
			if (std::numeric_limits<T>::min() + digit > result)
			{
				return false;
			}
			result -= digit;
		}
	}
	a_Num = result;
	return true;
}





/** Returns a number (of any integer type T) from a key-value string map.
Returns a_Default if the key is not present or the value is not a number representable in type T. */
template <typename T>
T GetStringMapInteger(const AStringMap & a_Map, const AString & a_Key, T a_Default)
{
	// Try to locate the key:
	auto itr = a_Map.find(a_Key);
	if (itr == a_Map.end())
	{
		return a_Default;
	}

	// Try to convert the value to a number:
	T res = a_Default;
	if (!StringToInteger<T>(itr->second, res))
	{
		return a_Default;
	}
	return res;
}





// If you have any other string helper functions, declare them here




