import argparse
import logging
from pathlib import Path
import logging

from . import (format_messages, merge_adjacent_messages,
               parse_messages_in_chat_folder, Message, filter_useless_messages)

logger = logging.getLogger(__name__)

def group_messages_by_year(messages: list[Message]) -> dict[int, list[Message]]:
    by_year = {}
    for msg in messages:
        by_year.setdefault(msg.sent_at.year, []).append(msg)
        del msg
    return by_year

def parse_args():
    parser = argparse.ArgumentParser()
    parser.add_argument('path', type=Path)
    parser.add_argument('--output', type=Path)
    return parser.parse_args()


def main():
    logging.basicConfig()
    logging.getLogger().setLevel('INFO')
    args = parse_args()

    server = args.path.parent.name
    receipient = args.path.name

    all_messages = parse_messages_in_chat_folder(args.path)
    all_messages = filter_useless_messages(all_messages)
    all_messages = merge_adjacent_messages(all_messages)

    messages_by_year = group_messages_by_year(all_messages)

    for year, messages in messages_by_year.items():
        output_file = args.output / f'{server} - {receipient} - {year}.md'
        logger.info("Writing %d messages to %s", len(messages), output_file)
        with open(output_file, 'w') as f:
            f.write(format_messages(messages, title = f'{server} - {receipient} - {year}'))

        del year, messages, output_file


if __name__ == '__main__':
    main()