#!/usr/bin/python3
#
# Some useful methods 
#   convert :
#     - String <-> Binary 
#     - String <-> Hex
#     - Reverse string (the most pythonic and rapid way using slices)
#     - String <-> base64
#     - Binary <-> Hex

class ConvertTool:
    def __init__(self):
        pass

    def stringToHex(self, input_str = ""):
        try:
            return ''.join('{0}'.format(hex(ord(char)).replace('0x', "")) for char in input_str)
        except Exception as e:
            print("Error occurred during convertion of {0} into a Hex\nError: {1} ".format(input_str, e))
            return None

    def hexToString(self, input_str = ""):
        try:
            return ''.join('{0}'.format(chr(int(x, 16))) for x in [input_str[i:i+2] for i in range(0, len(input_str), 2)])
        except Exception as e:
            print("Error occurend during the convertion of {0} into a string\nError: {1}".format(input_str, e))
            return None

    def stringToBinary(self, input_str = ""):
        try:
            return ''.join('{0:08b}'.format(ord(char), 'b') for char in input_str )
        except Exception as e:
            print("Error occurred druing the convertion of {0} to Binary\nError: {1}".format(input_str, e))
            return None

    def binaryToString(self, input_str = ""):
        # Convert binary into hex then convert hex into string
        try:
            return self.hexToString(self.binaryToHex(input_str))
        except Exception as e:
            print("Error occurred during the convertion of {0} into a String\nError: {1}".format(input_str, e))
            return None

    def binaryToHex(self, input_str = ""):
        try:
            return "{0:0>4x}".format(int(input_str, 2))
        except Exception as e:
            print("Error occurred during the convertion of {0} into a Hex\nError: {1}".format(input_str, e))
            return None

    def hexToBinary(self, input_str = ""):
        try:
            return '{0:0>4b}'.format(int(input_str, 16))
        except Exception as e:
            print("Error occurred during the convertion of {0} into a Binary\nError: {1}".format(input_str, e))
            return None

    def reverseString(self, input_str = ""):
        try:
            return input_str[::-1]
        except Exception as e:
            print("Error occurred during reversing {0}\nError: {1}".format(input_str, e))
            return None

    def stringToBase64(self, input_str = ""):
        try:
            from base64 import b64encode
            return b64encode(input_str.encode()).decode('utf8')
        except Exception as e:
            print("Error occurred during encoding {0} into base64\nError: {1}".format(input_str, e))
            return None

    def base64ToString(self, input_str = ""):
        try:
            from base64 import b64decode
            return b64decode(input_str.encode()).decode('utf8')
        except Exception as e:
            print("Error occurred during decoding {0} into String\nError: {1}".format(input_str, e))
            return None

# Test
if __name__ == '__main__':
    app = ConvertTool()
    print("string -> hex: ", app.stringToHex("ÿÿa"))
    print("hex -> string : ", app.hexToString("6161"))
    print("string -> binary: ", app.stringToBinary("ÿÿa"))
    print("binary -> hex: ", app.binaryToHex("1111111111111111"))
    print("binary -> string: ", app.binaryToString("1111111111111111"))
    print("hex -> binary: ", app.hexToBinary("ffff61"))
    print("reversed string: ", app.reverseString("hello nexus "))
    print("string -> base64: ", app.stringToBase64("chiheb nexus"))
    print("base64 -> string: ", app.base64ToString("Y2hpaGViIG5leHVz"))