/*
*  utilite is a cross-platform library with
*  useful utilities for fast and small developing.
*  Copyright (C) 2010  Mathieu Labbe
*
*  utilite is free library: you can redistribute it and/or modify
*  it under the terms of the GNU Lesser General Public License as published by
*  the Free Software Foundation, either version 3 of the License, or
*  (at your option) any later version.
*
*  utilite is distributed in the hope that it will be useful,
*  but WITHOUT ANY WARRANTY; without even the implied warranty of
*  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
*  GNU Lesser General Public License for more details.
*
*  You should have received a copy of the GNU Lesser General Public License
*  along with this program.  If not, see <http://www.gnu.org/licenses/>.
*/

#ifndef UCONVERSION_H
#define UCONVERSION_H

#include "rtabmap/utilite/utilite_export.h" // DLL export/import defines

#include <string>
#include <vector>
#include <stdarg.h>

/**
 * \file UConversion.h
 * \brief Some conversion functions
 *
 * This contains functions to do some convenient conversion like
 * uNumber2str(), uBytes2Hex() or uHex2Bytes().
*/

/**
 * Replace old characters in a string to new ones.
 * Example :
 * @code
 * std::string str = "Hello";
 * uReplaceChar(str, 'l', 'p');
 * // The results is str = "Heppo";
 * @endcode
 *
 * @param str the string
 * @param before the character to be replaced by the new one
 * @param after the new character replacing the old one
 * @return the modified string
 */
std::string UTILITE_EXPORT uReplaceChar(const std::string & str, char before, char after);

/**
 * Replace old characters in a string with the specified string.
 * Example :
 * @code
 * std::string str = "Hello";
 * uReplaceChar(str, 'o', "oween");
 * // The results is str = "Helloween";
 * @endcode
 *
 * @param str the string
 * @param before the character to be replaced by the new one
 * @param after the new string replacing the old character
 * @return the modified string
 */
std::string UTILITE_EXPORT uReplaceChar(const std::string & str, char before, const std::string & after);

/**
 * Transform characters from a string to upper case.
 * Example :
 * @code
 * std::string str = "hello!";
 * str = uToUpperCase(str);
 * //str is now equal to "HELLO!"
 * @endcode
 * @param str the string
 * @return the modified string
 */
std::string UTILITE_EXPORT uToUpperCase(const std::string & str);

/**
 * Transform characters from a string to lower case.
 * Example :
 * @code
 * std::string str = "HELLO!";
 * str = uToLowerCase(str, false);
 * //str is now equal to "hello!"
 * @endcode
 * @param str the string
 * @return the modified string
 */
std::string UTILITE_EXPORT uToLowerCase(const std::string & str);

/**
 * Convert a number (unsigned int) to a string.
 * @param number the number to convert in a string
 * @return the string
 */
std::string UTILITE_EXPORT uNumber2Str(unsigned int number);
/**
 * Convert a number (int) to a string.
 * @param number the number to convert in a string
 * @return the string
 */
std::string UTILITE_EXPORT uNumber2Str(int number);
/**
 * Convert a number (float) to a string.
 * @param number the number to convert in a string
 * @return the string
 */
std::string UTILITE_EXPORT uNumber2Str(float number, int precision=6, bool fixed = false);
/**
 * Convert a number (double) to a string.
 * @param number the number to convert in a string
 * @return the string
 */
std::string UTILITE_EXPORT uNumber2Str(double number, int precision=6, bool fixed = false);

/**
 * Convert a string to an integer.
 * @param the string
 * @return the number
 */
int UTILITE_EXPORT uStr2Int(const std::string & str);

/**
 * Convert a string to a float independent of the locale (comma/dot).
 * @param the string
 * @return the number
 */
float UTILITE_EXPORT uStr2Float(const std::string & str);

/**
 * Convert a string to a double independent of the locale (comma/dot).
 * @param the string
 * @return the number
 */
double UTILITE_EXPORT uStr2Double(const std::string & str);


/**
 * Convert a bool to a string.
 * The format used is "true" and "false".
 * @param boolean the boolean to convert in a string
 * @return the string
 */
std::string UTILITE_EXPORT uBool2Str(bool boolean);
/**
 * Convert a string to a boolean.
 * The format used is :
 * "false", "FALSE" or "0" give false. All others give true.
 * @param str the string to convert in a boolean
 * @return the boolean
 */
bool UTILITE_EXPORT uStr2Bool(const char * str);
bool UTILITE_EXPORT uStr2Bool(const std::string & str);

/**
 * Convert a string to an array of bytes including the null character ('\0').
 * @param str the string
 * @return the array of bytes
 */
std::vector<unsigned char> UTILITE_EXPORT uStr2Bytes(const std::string & str);

/**
 * Convert an array of bytes to string, the array of bytes must end with the null character ('\0').
 * @param bytes the array of bytes
 * @return the string
 */
std::string UTILITE_EXPORT uBytes2Str(const std::vector<unsigned char> & bytes);

/**
 * Convert a bytes array to an hexadecimal string.
 * The resulting string is twice the size of the bytes array. The hexadecimal
 * Characters are in upper case.
 * Example :
 * @code
 * char bytes[] = {0x3F};
 * std::string hex = uBytes2Hex(bytes, 1);
 * // The string constains "3F".
 * @endcode
 *
 * @param bytes the bytes array
 * @param bytesLen the length of the bytes array
 * @return the hexadecimal string
 */
std::string UTILITE_EXPORT uBytes2Hex(const char * bytes, unsigned int bytesLen);
/**
 * Convert an hexadecimal string to a bytes array.
 * The string must be pair length. The hexadecimal
 * Characters can be in upper or lower case.
 * Example :
 * @code
 * std::string hex = "1f3B";
 * std::vector<char> bytes = uHex2Bytes(hex);
 * // The array contains {0x1F, 0x3B}.
 * @endcode
 *
 * @param hex the hexadecimal string
 * @return the bytes array
 */
std::vector<char> UTILITE_EXPORT uHex2Bytes(const std::string & hex);
/**
 * Convert an hexadecimal string to a bytes array.
 * The string must be pair length. The hexadecimal
 * Characters can be in upper or lower case.
 * Example :
 * @code
 * std::vector<char> bytes = uHex2Bytes("1f3B", 4);
 * // The array contains {0x1F, 0x3B}.
 * @endcode
 *
 * @param hex the hexadecimal string
 * @param bytesLen the hexadecimal string length
 * @return the bytes array
 */
std::vector<char> UTILITE_EXPORT uHex2Bytes(const char * hex, int hexLen);

/**
 * Convert an hexadecimal string to an ascii string. A convenient way
 * when using only strings.
 * The hexadecimal str MUST not contains any null values 0x00 ("00").
 * Think to use of hex2bytes() to handle 0x00 values.
 * Characters can be in upper or lower case.
 * Example :
 * @code
 * std::string str = uHex2Str("48656C6C4F21");
 * // The string contains "Hello!".
 * @endcode
 *
 * @see hex2bytes
 * @param hex the hexadecimal string
 * @return the ascii string
 */
std::string UTILITE_EXPORT uHex2Str(const std::string & hex);

/**
 * Convert hexadecimal (left or right part) value to an ascii character.
 * Example :
 * @code
 * unsigned char F = uHex2Ascii(0xFA, false);
 * unsigned char A = uHex2Ascii(0xFA, true);
 * @endcode
 * @see ascii2hex
 * @param c the hexadecimal value
 * @param rightPart If we want the character corresponding to the right of left part (4 bits) of the byte value.
 * @return the ascii character (in upper case)
 */
unsigned char UTILITE_EXPORT uHex2Ascii(const unsigned char & c, bool rightPart);

/**
 * Convert an ascii character to an hexadecimal value (right 4 bits).
 * Characters can be in upper or lower case.
 * Example :
 * @code
 * unsigned char hex = uAscii2Hex('F');
 * // The results is hex = 0x0F;
 * @endcode
 * @see hex2ascii
 * @param c the ascii character
 * @return the hexadecimal value
 */
unsigned char UTILITE_EXPORT uAscii2Hex(const unsigned char & c);

/**
 * Format a string like printf, and return it as a std::string
 */
std::string UTILITE_EXPORT uFormatv (const char *fmt, va_list ap);

/**
 * Format a string like printf, and return it as a std::string
 */
std::string UTILITE_EXPORT uFormat (const char *fmt, ...);

#ifdef _WIN32
/**
 * Convert multi-byte string to unicode (wide-char) string.
 * Note that returned whar_t * must be deleted : delete [] wText;
 */
UTILITE_EXPORT wchar_t * createWCharFromChar(const char * text);

/**
 * Convert unicode (wide-char) string to multi-byte string.
 * Note that returned char * must be deleted : delete [] text;
 */
UTILITE_EXPORT char * createCharFromWChar(const wchar_t * wText);
#endif

#endif /* UCONVERSION_H */
