#!/usr/bin/env python3
# This standalone script is used to pause torrents older than last x days,
# run mover (in Unraid) and start torrents again once completed
import argparse
import os
import sys
import time
from datetime import datetime
from datetime import timedelta

parser = argparse.ArgumentParser(prog="Qbit Mover", description="Stop torrents and kick off Unraid mover process")
parser.add_argument("--host", help="qbittorrent host including port", required=True)
parser.add_argument("-u", "--user", help="qbittorrent user", default="admin")
parser.add_argument("-p", "--password", help="qbittorrent password", default="adminadmin")
parser.add_argument(
    "--cache-mount",
    "--cache_mount",
    help="Cache mount point in Unraid. This is used to additionally filter for only torrents that exists on the cache mount."
    "Use this option ONLY if you follow TRaSH Guides folder structure.",
    default=None,
)
parser.add_argument(
    "--days-from", "--days_from", help="Set Number of Days to stop torrents between two offsets", type=int, default=0
)
parser.add_argument("--days-to", "--days_to", help="Set Number of Days to stop torrents between two offsets", type=int, default=2)
# --DEFINE VARIABLES--#

# --START SCRIPT--#
try:
    from qbittorrentapi import APIConnectionError
    from qbittorrentapi import Client
    from qbittorrentapi import LoginFailed
except ModuleNotFoundError:
    print('Requirements Error: qbittorrent-api not installed. Please install using the command "pip install qbittorrent-api"')
    sys.exit(1)


def filter_torrents(torrent_list, timeoffset_from, timeoffset_to, cache_mount):
    result = []
    for torrent in torrent_list:
        if torrent.added_on >= timeoffset_to and torrent.added_on <= timeoffset_from:
            if not cache_mount or exists_in_cache(cache_mount, torrent.content_path):
                result.append(torrent)
        elif torrent.added_on < timeoffset_to:
            break
    return result


def exists_in_cache(cache_mount, content_path):
    cache_path = os.path.join(cache_mount, content_path.lstrip("/"))
    return os.path.exists(cache_path)


def stop_start_torrents(torrent_list, pause=True):
    for torrent in torrent_list:
        if pause:
            print(f"Pausing: {torrent.name} [{torrent.added_on}]")
            torrent.pause()
        else:
            print(f"Resuming: {torrent.name} [{torrent.added_on}]")
            torrent.resume()


if __name__ == "__main__":
    current = datetime.now()
    args = parser.parse_args()

    if args.days_from > args.days_to:
        raise ("Config Error: days_from must be set lower than days_to")

    try:
        client = Client(host=args.host, username=args.user, password=args.password)
    except LoginFailed:
        raise ("Qbittorrent Error: Failed to login. Invalid username/password.")
    except APIConnectionError:
        raise ("Qbittorrent Error: Unable to connect to the client.")
    except Exception:
        raise ("Qbittorrent Error: Unable to connect to the client.")

    timeoffset_from = current - timedelta(days=args.days_from)
    timeoffset_to = current - timedelta(days=args.days_to)
    torrent_list = client.torrents.info(sort="added_on", reverse=True)

    torrents = filter_torrents(torrent_list, timeoffset_from.timestamp(), timeoffset_to.timestamp(), args.cache_mount)

    # Pause Torrents
    print(f"Pausing [{len(torrents)}] torrents from {args.days_from} - {args.days_to} days ago")
    stop_start_torrents(torrents, True)
    time.sleep(10)
    # Start mover
    print("Starting Mover")
    # Or using mover tunning
    # os.system('/usr/local/sbin/mover start')
    os.system("/usr/local/sbin/mover.old start")
    # Start Torrents
    print(f"Resuming [{len(torrents)}] paused torrents from {args.days_from} - {args.days_to} days ago")
    stop_start_torrents(torrents, False)