import argparse
import codecs
import glob
import pyperclip
import re
import sys


def contentreplace(filename, replace_from, replace_to, autoyes=False, do_regex=False):
    f = open(filename, 'r', encoding='utf-8')
    with f:
        content = f.read()

    if do_regex:
        occurances = len(re.findall(replace_from, content))
    else:
        occurances = content.count(replace_from)

    print(f'{filename}: Found {occurances} occurences.')
    if occurances == 0:
        return

    permission = autoyes or (input('Replace? ').lower() in ('y', 'yes'))
    if not permission:
        return

    if do_regex:
        content = re.sub(replace_from, replace_to, content)
    else:
        content = content.replace(replace_from, replace_to)

    f = open(filename, 'w', encoding='utf-8')
    with f:
        f.write(content)

def contentreplace_argparse(args):
    filenames = glob.glob(args.filename_glob)

    if args.clip_prompt:
        replace_from = input('Ready from')
        if not replace_from:
            replace_from = pyperclip.paste()
        replace_to = input('Ready to')
        if not replace_to:
            replace_to = pyperclip.paste()
    else:
        replace_from = codecs.decode(args.replace_from, 'unicode_escape')
        replace_to = codecs.decode(args.replace_to, 'unicode_escape')

    for filename in filenames:
        contentreplace(
            filename,
            replace_from,
            replace_to,
            autoyes=args.autoyes,
            do_regex=args.do_regex,
        )

def main(argv):
    parser = argparse.ArgumentParser(description=__doc__)

    parser.add_argument('filename_glob')
    parser.add_argument('replace_from')
    parser.add_argument('replace_to')
    parser.add_argument('-y', '--yes', dest='autoyes', action='store_true', help='accept results without confirming')
    parser.add_argument('--regex', dest='do_regex', action='store_true')
    parser.add_argument('--clip_prompt', dest='clip_prompt', action='store_true')
    parser.set_defaults(func=contentreplace_argparse)

    args = parser.parse_args(argv)
    args.func(args)

if __name__ == '__main__':
    raise SystemExit(main(sys.argv[1:]))