import os
import sys
import re
import getopt
import commands
import subprocess
import fnmatch
import fileinput


MATCH_FILE = ""
TARGET_STRING = ""
REPLACE_STRING = ""


class color:
    PURPLE = '\033[95m'
    CYAN = '\033[96m'
    DARKCYAN = '\033[36m'
    BLUE = '\033[94m'
    GREEN = '\033[92m'
    YELLOW = '\033[93m'
    RED = '\033[91m'
    BOLD = '\033[1m'
    UNDERLINE = '\033[4m'
    END = '\033[0m'


def showusage():
    print color.BOLD + "Usage:" + color.END
    print "python %s -m \'match_file\' -t \'target_string\' -r \'replace_string\'" % sys.argv[0]


def getparamater(argv):
    try:
        opts, args = getopt.getopt(argv, "m:t:r:", ['match=target=replace='])
        return opts, args
    except getopt.GetoptError:
        showusage()
        sys.exit(1)


def isparamatervalid():
    if len(MATCH_FILE) > 0 and len(TARGET_STRING) > 0 and len(REPLACE_STRING) > 0:
        return True
    return False


def replace_match_filename_string(match_filename, oldstring, newstring):
    status, files = commands.getstatusoutput('find . -type f -name \'' + match_filename + '\'')
    for file in files.splitlines():
        replace_file_string(file, oldstring, newstring)


def replace_file_string(filepath, oldstring, newstring):
    for line in fileinput.input(filepath, inplace = 1):
        sys.stdout.write(line.replace(oldstring, newstring))


if __name__ == "__main__":
    opts, args = getparamater(sys.argv[1:])
    for opt, arg in opts:
        if opt in ("-m", "--match"):
            MATCH_FILE = arg
        if opt in ("-t", "--target"):
            TARGET_STRING = arg
        if opt in ("-r", "--replace"):
            REPLACE_STRING = arg

    if isparamatervalid():
        replace_match_filename_string(MATCH_FILE, TARGET_STRING, REPLACE_STRING)
    else:
        showusage()
        sys.exit(1)