#!/usr/bin/env python3

import argparse
import datetime
import sys

from translate.storage.tmx import tmxfile


def extract_from_tmx(tmx_file_path,
                     src_out_path,
                     tgt_out_path,
                     begin_date,
                     date,
                     src_out_after,
                     tgt_out_after):
    with open(tmx_file_path, "rb") as in_fp:
        tmx_file = tmxfile(in_fp)

    if src_out_after is not None and tgt_out_after is not None:
        src_out_after_fp = open(src_out_after, "w")
        tgt_out_after_fp = open(tgt_out_after, "w")


    with open(src_out_path, "w") as src_out_fp, open(tgt_out_path, "w") as tgt_out_fp:
        for index, node in enumerate(tmx_file.unit_iter()):
            src_out_fp_ = src_out_fp
            tgt_out_fp_ = tgt_out_fp

            if begin_date is not None:
                date_string = node.get_target_dom().get("lastusagedate")[:8]
                date_obj = datetime.datetime.strptime(date_string, "%Y%m%d").date()
                if date_obj < begin_date:
                    continue

            if date is not None:
                date_string = node.get_target_dom().get("changedate")[:8]
                date_obj = datetime.datetime.strptime(date_string, "%Y%m%d").date()
                if date_obj > date:
                    src_out_fp_ = src_out_after_fp
                    tgt_out_fp_ = tgt_out_after_fp

            src_string = f"{node.source}"
            tgt_string = f"{node.target}"
            src_string = src_string.replace("\n", " ").replace("\r", "")
            tgt_string = tgt_string.replace("\n", " ").replace("\r", "")

            src_out_fp_.write(f"{src_string}\n")
            tgt_out_fp_.write(f"{tgt_string}\n")
            if (index + 1) % 1000 == 0:
                sys.stdout.write(f"Processed {index + 1} lines\r")
                sys.stdout.flush()

    if src_out_after is not None and tgt_out_after is not None:
        src_out_after_fp.close()
        tgt_out_after_fp.close()


def main():

    usage = f"Usage: {sys.argv[0]} [options]"
    parser = argparse.ArgumentParser(usage=usage)
    parser.add_argument("-i", "--input", help="input tmx file")
    parser.add_argument("-d", "--date", help="date for splitting the output")
    parser.add_argument("-b", "--begin_date", help="earliest date (lastusage) to retain data")

    args = parser.parse_args()

    if args.input is None:
        parser.print_help()
        sys.exit(1)

    src_out = f"{args.input}.src"
    tgt_out = f"{args.input}.tgt"


    if args.date is not None:
        date = datetime.datetime.strptime(args.date, "%Y-%m-%d").date()
        src_out_after = f"{src_out}.after.{args.date}"
        tgt_out_after = f"{tgt_out}.after.{args.date}"
    else:
        date = None
        src_out_after = None
        tgt_out_after = None

    if args.begin_date is not None:
        begin_date = datetime.datetime.strptime(args.begin_date, "%Y-%m-%d").date()
    else:
        begin_date = None

    extract_from_tmx(args.input, src_out, tgt_out, begin_date, date, src_out_after, tgt_out_after)


if __name__ == "__main__":
    main()