# Copyright 2024 Google LLC
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

import json, argparse, codecs, re, os

def generate_codepoint_requirements(path, encoding='utf-8', controlchars=False):
    latin_start = 0x20
    latin_end = 0x2AF
    lang = None
    codepoints = set()

    with codecs.open(path, encoding=encoding, mode='r') as fin:
        for line in fin:
            if lang is None:
                langstr = re.search("^\"Language: (\w*)", line)
                lang = langstr.group(1) if langstr else None
                continue

            msgstr = re.search("^msgstr \"(.*)\"$", line)
            if msgstr and len(msgstr.group(1)) > 0:
                for char in msgstr.group(1):
                    codepoints.update(char)

        required_codepoints = [ord(c) for c in codepoints if ord(c) > latin_end or (ord(c) < latin_start and controlchars)]
        return {'language': lang, 'codepoints': required_codepoints}

def main():
    parser = argparse.ArgumentParser(description="Given a PO file, generate a JSON file containing the codepoints required to display the translated strings")
    parser.add_argument('input', help="Path to PO file containing translated strings")
    parser.add_argument('--output', help="Path to output JSON file containing codepoints")
    parser.add_argument('--encoding', help="Set encoding of input file (default is utf-8)", default='utf-8')
    parser.add_argument('--controlchars', help="If set, control characters (U+0000 - U+001F) will not be excluded", action='store_true')
    args = parser.parse_args()

    if args.output is None:
        args.output = os.path.splitext(args.input)[0] + '.json'

    fout = open(args.output, mode='w')
    fout.write(json.dumps(generate_codepoint_requirements(args.input, args.encoding, args.controlchars), indent=2))

if __name__ == "__main__":
    main()