import argparse
import codecs
import os
import pyperclip
import re
import sys

from voussoirkit import interactive
from voussoirkit import pathclass
from voussoirkit import pipeable
from voussoirkit import spinal
from voussoirkit import vlogging
from voussoirkit import winglob

log = vlogging.getLogger(__name__, 'contentreplace')

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

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

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

    if not (autoyes or interactive.getpermission('Replace?')):
        return

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

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

@pipeable.ctrlc_return1
def contentreplace_argparse(args):
    if args.recurse:
        files = spinal.walk('.', yield_files=True, yield_directories=False)
        files = (f for f in files if winglob.fnmatch(f.basename, args.filename_glob))
    else:
        files = pathclass.cwd().glob(args.filename_glob)
        files = (f for f in files if f.is_file)

    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')
        if args.do_regex:
            replace_to = args.replace_to
        else:
            replace_to = codecs.decode(args.replace_to, 'unicode_escape')

    for file in files:
        try:
            contentreplace(
                file,
                replace_from,
                replace_to,
                autoyes=args.autoyes,
                do_regex=args.do_regex,
            )
        except UnicodeDecodeError:
            log.error('%s encountered unicode decode error.', file.absolute_path)

def main(argv):
    argv = vlogging.main_level_by_argv(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('--recurse', action='store_true')
    parser.add_argument('--regex', dest='do_regex', action='store_true')
    parser.add_argument('--clip_prompt', '--clip-prompt', action='store_true')
    parser.set_defaults(func=contentreplace_argparse)

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

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