import os
import cherrypy
import logging
from jinja2 import Environment, FileSystemLoader, select_autoescape
from deluge_client import DelugeRPCClient
from urllib.parse import urlparse
from pprint import pprint
from threading import Thread
from time import sleep
from queue import Queue
from dataclasses import dataclass, field


APPROOT = os.path.abspath(os.path.join(os.path.dirname(__file__), "../"))


@dataclass
class Cache:
    torrents: dict = field(default_factory=dict)


class ClientCache(object):
    def __init__(self, client):
        self.client = client
        self.data = Cache()
        self.q = Queue()

        self.background_t = Thread(target=self.background, daemon=True)
        self.background_t.start()

        self.timer_t = Thread(target=self.timer, daemon=True)
        self.timer_t.start()

    def refresh(self):
        self.q.put(None)

    def background(self):
        while True:
            self.q.get()  # block until we need to do something
            logging.info("performing background tasks...")

            self.data.torrents = self.client.core.get_torrents_status({"label": "sickrage"},
                                                                      ['name', 'label', 'save_path', 'is_seed',
                                                                       'is_finished', 'progress'])

            self.q.task_done()
            logging.info("background tasks complete")

    def timer(self):
        while True:
            self.refresh()
            logging.info("sleeping...")
            sleep(300)  # TODO configurable task interval


class MediaWeb(object):
    def __init__(self, rpc, templater, uioptions):
        self.tpl = templater
        self.rpc = rpc
        self.uioptions = uioptions

    def render(self, template, **kwargs):
        """
        Render a template
        """
        return self.tpl.get_template(template).render(**kwargs, options=self.uioptions, **self.get_default_vars())

    def get_default_vars(self):
        return {}

    @cherrypy.expose
    def index(self, action=None):
        if action:
            if action == "update":
                self.rpc.refresh()
            raise cherrypy.HTTPRedirect("/")
        return self.render("index.html", torrents=self.rpc.data.torrents)

    @cherrypy.expose
    def move(self, thash, dest=None, otherdest=None):
        torrent = self.rpc.client.core.get_torrent_status(thash, [])  # TODO reduce to needed fields

        if cherrypy.request.method == "POST" and (dest or otherdest):
            target = otherdest or dest
            self.rpc.client.core.move_storage([thash], target)
            self.rpc.refresh()
            raise cherrypy.HTTPRedirect("/")

        return self.render("moveform.html", torrent=torrent)


def main():
    import argparse
    import signal

    parser = argparse.ArgumentParser(description="mediaweb server")

    parser.add_argument('-p', '--port', help="tcp port to listen on",
                        default=int(os.environ.get("MEDIAWEB_PORT", 8080)), type=int)
    parser.add_argument('-i', '--download-dirs', help="download directories", nargs="+",
                        default=os.environ.get("MEDIAWEB_DLDIR"))
    parser.add_argument('-o', '--library', default=os.environ.get("STORAGE_URL"), help="media library path")
    parser.add_argument('--debug', action="store_true", help="enable development options")
    parser.add_argument('-s', '--server', help="deluge uris", action="append", required=True)
    parser.add_argument('--ui-movedests', help="move destination options in the UI", nargs="+", required=True)

    args = parser.parse_args()

    uioptions = {
        "movedests": args.ui_movedests,
    }

    # TODO smarter argparser that understands env vars
    if not args.library:
        parser.error("--download-dirs or MEDIAWEB_DLDIR is required")

    logging.basicConfig(level=logging.INFO if args.debug else logging.WARNING,
                        format="%(asctime)-15s %(levelname)-8s %(filename)s:%(lineno)d %(message)s")

    tpl_dir = os.path.join(APPROOT, "templates") if not args.debug else "templates"
    tpl = Environment(loader=FileSystemLoader(tpl_dir),
                      autoescape=select_autoescape(['html', 'xml']))
    # self.tpl.filters.update(basename=os.path.basename,
    #                         ceil=math.ceil

    def validate_password(realm, user, passw):
        return user == passw  # lol

    # assume 1 deluge server for now
    uri = urlparse(args.server[0])
    assert uri.scheme == "deluge"
    rpc = DelugeRPCClient(uri.hostname, uri.port if uri.port else 58846, uri.username, uri.password, decode_utf8=True)

    rpc_cache = ClientCache(rpc)

    web = MediaWeb(rpc_cache, tpl, uioptions)
    cherrypy.tree.mount(web, '/', {'/': {'tools.auth_basic.on': True,
                                         'tools.auth_basic.realm': 'mediaweb',
                                         'tools.auth_basic.checkpassword': validate_password, }})

    # General config options
    cherrypy.config.update({
        'tools.sessions.on': False,
        'request.show_tracebacks': True,
        'server.show_tracebacks': True,
        'server.socket_port': args.port,
        'server.thread_pool': 1 if args.debug else 5,
        'server.socket_host': '0.0.0.0',
        'log.screen': False,
        'engine.autoreload.on': args.debug
    })

    # Setup signal handling and run it.
    def signal_handler(signum, stack):
        logging.critical('Got sig {}, exiting...'.format(signum))
        cherrypy.engine.exit()

    signal.signal(signal.SIGINT, signal_handler)
    signal.signal(signal.SIGTERM, signal_handler)

    try:
        cherrypy.engine.start()
        cherrypy.engine.block()
    finally:
        logging.info("API has shut down")
        cherrypy.engine.exit()


if __name__ == '__main__':
    main()


# https://github.com/deluge-torrent/deluge/blob/1.3-stable/deluge/ui/console/commands/info.py#L46
# https://deluge.readthedocs.io/en/latest/reference/api.html?highlight=rpc