#!/usr/bin/env python3
# Copyright (c) 2023 Florian Fischer. All rights reserved.
#
# This file is part of geldschieberbot.
#
# geldschieberbot is free software: you can redistribute it and/or modify it
# under the terms of the GNU General Public License as published by the Free
# Software Foundation, either version 3 of the License, or (at your option)
# any later version.
#
# geldschieberbot is distributed in the hope that it will be useful, but WITHOUT
# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
# FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License along with
# geldschieberbot found in the LICENSE file. If not,
# see <https://www.gnu.org/licenses/>.
"""Run geldschieberbot on all received messages, send replies, and exit"""

import argparse
from datetime import datetime
import json
import os
import subprocess
import sys
import typing as T

from geldschieberbot import Geldschieberbot
from models import Reply, Quote


def send(_cmd, msgs: list[Reply], quote: T.Optional[Quote] = None):
    """Send a message with optional attachment"""
    for msg in msgs:
        cmd = _cmd
        if msg.attachment:
            cmd += f' -a {msg.attachment}'

        if quote:
            cmd += f' --quote-timestamp={quote.timestamp} --quote-author={quote.author}'

        subprocess.run(cmd.split(' '), input=msg.msg.encode(), check=False)


def die(msg: str, status=1):
    """Exit because an error ocurred"""
    print(msg, file=sys.stderr)
    sys.exit(status)


def main():
    """Read messages from stdin and send the bot's replies back"""
    parser = argparse.ArgumentParser()
    parser.add_argument('-d',
                        '--dry-run',
                        help='do not persist changes',
                        action='store_true')
    parser.add_argument('-f', '--state-file', help='the state file')
    parser.add_argument('-g', '--group-id', help='the group id to listen to')
    parser.add_argument('--send-cmd',
                        help='the shell command used to send messages')
    parser.add_argument('-nq',
                        '--no-quote',
                        help='not quote the message causing the reply',
                        action='store_true')
    args = parser.parse_args()

    if args.dry_run:
        print("Dry Run no changes will apply!")

    state_path = args.state_file or os.environ['GSB_STATE_FILE']
    if not state_path:
        die('A state path must be provided')

    send_cmd = args.send_cmd or os.environ['GSB_SEND_CMD']
    if not send_cmd:
        die('A send command must be provided')

    group_id = args.group_id or os.environ['GSB_GROUP_ID']
    if not group_id:
        die('A group id must be provided')

    with Geldschieberbot(state_path, group_id, dry_run=args.dry_run) as bot:
        # Read cmds from stdin
        for line in sys.stdin.read().splitlines():
            try:
                envelope = json.loads(line)['envelope']
            except json.JSONDecodeError:
                print(datetime.now(), line, "not valid json")
                continue

            quote = None
            if not args.no_quote:
                quote = Quote(timestamp=envelope['timestamp'],
                              author=envelope['source'])

            send(send_cmd, bot.handle(envelope), quote)

        send(send_cmd, bot.run_scheduled_cmds())


if __name__ == "__main__":
    main()