// StringUtils.h

// Interfaces to various string helper functions




#pragma once

#include <string>
#include <limits>




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





/** Add the formated string to the existing data in the string */
extern AString & AppendVPrintf(AString & str, const char * format, va_list args) FORMATSTRING(2, 0);

/// Output the formatted text into the string
extern AString & Printf       (AString & str, const char * format, ...) FORMATSTRING(2, 3);

/// Output the formatted text into string, return string by value
extern AString Printf(const char * format, ...) FORMATSTRING(1, 2);

/// Add the formatted string to the existing data in the string
extern AString & AppendPrintf (AString & str, const char * format, ...) FORMATSTRING(2, 3);

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

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

/// Trime whitespace at both ends of the string
extern AString TrimString(const AString & str);  // tolua_export

/// In-place string conversion to uppercase; returns the same string
extern AString & InPlaceUppercase(AString & s);

/// In-place string conversion to lowercase; returns the same string
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
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

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

/// Converts a UTF-8 string into a UTF-16 BE string, packing that back into AString; return a ref to a_UTF16
extern AString & UTF8ToRawBEUTF16(const char * a_UTF8, size_t a_UTF8Length, AString & a_UTF16);

/// Creates a nicely formatted HEX dump of the given memory block. Max a_BytesPerLine is 120
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, replacing all "%HH" into the correct characters. Invalid % sequences are left intact
extern AString URLDecode(const AString & a_String);  // Cannot export to Lua automatically - would generated an extra return value

/// 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 char * a_Mem);

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

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

/// 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 = a_str[i] - '0';
			if (std::numeric_limits<T>::max() - digit < result)
			{
				return false;
			}
			result += digit;
		}
	}
	else
	{
		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 = a_str[i] - '0';
			if (std::numeric_limits<T>::min() + digit > result)
			{
				return false;
			}
			result -= digit;
		}
	}
	a_Num = result;
	return true;
}

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