# -*- coding: utf-8 -*-
import os
import threading
import urllib.error
import urllib.parse
import urllib.request

import sys
import time
import xbmc
import xbmcvfs
from . import log as logging

from . import FileStatus, SessionStatus
from .error import Error
from .structs import Encryption
from .util import can_bind, find_free_port, localize_path, uri2path, detect_media_type, get_platform

platform = get_platform()
dirname = os.path.join(xbmcvfs.translatePath('special://temp'), 'xbmcup', 'script.module.gorrent2http')
dest_path = os.path.join(dirname, platform['system'])
sys.path.insert(0, dest_path)

try:
    from gorrent import gorrent as gt

    logging.info(f'Imported gorrent v{gt.Version()}')
except Exception:
    import traceback

    logging.error(f'Error importing gorrent. Exception: {traceback.format_exc()}')
    raise

LOGGING = True


class Engine:
    """
    This is python binding class to gorrent2http client.
    """

    def _log(self, message):
        if self.logger:
            self.logger(message)
        else:
            xbmc.log("[gorrent2http] %s" % message)

    def __init__(self, uri=None, download_path=".",
                 bind_host='127.0.0.1', bind_port=5001, connections_limit=200,
                 keep_files=False,
                 listen_port=6881,
                 debug_alerts=False,
                 proxy=None,
                 seed=True,
                 accept_peer_conn=True,
                 startup_timeout=5,
                 logger=None,
                 ):

        self.platform = platform
        self.bind_host = bind_host
        self.bind_port = bind_port
        self.download_path = download_path
        self.connections_limit = connections_limit
        self.keep_files = keep_files
        self.listen_port = listen_port
        self.wait_on_close_timeout = None
        self.debug_alerts = debug_alerts
        self.uri = uri
        self.started = False
        self.proxy = proxy
        self.seed = seed
        self.accept_peer_conn = accept_peer_conn
        self.startup_timeout = startup_timeout
        self.logger = logger

        self.message_logger = None
        self.run_message_logger = True

    @staticmethod
    def _validate_save_path(path):
        path = xbmcvfs.translatePath(path)
        if "://" in path:
            if sys.platform.startswith('win') and path.lower().startswith("smb://"):
                path = path.replace("smb:", "").replace("/", "\\")
            else:
                raise Error("Downloading to an unmounted network share is not supported", Error.INVALID_DOWNLOAD_PATH)
        if not os.path.isdir(localize_path(path)):
            raise Error("Download path doesn't exist (%s)" % path, Error.INVALID_DOWNLOAD_PATH)
        return localize_path(path)

    def start(self, start_index):
        download_path = self._validate_save_path(self.download_path)
        if not can_bind(self.bind_host, self.bind_port):
            port = find_free_port(self.bind_host)
            if port is False:
                raise Error("Can't find port to bind gorrent2http", Error.BIND_ERROR)
            self._log("Can't bind to %s:%s, so we found another port: %d" % (self.bind_host, self.bind_port, port))
            self.bind_port = port

        self._log("Invoking gorrent2http")

        class Logging(object):
            def __init__(self, _log):
                self._log = _log

            def info(self, message):
                if LOGGING:
                    self._log('INFO: %s' % (message,))

            def error(self, message):
                if LOGGING:
                    self._log('ERROR: %s' % (message,))

        gt.logging = Logging(self._log)

        settings = gt.NewSettings()
        settings.DownloadPath = download_path
        settings.HttpBindHost = self.bind_host
        settings.HttpBindPort = self.bind_port
        settings.ListenPort = self.listen_port
        settings.TorrentPath = uri2path(self.uri)
        settings.MaxConnections = self.connections_limit
        settings.Debug = self.debug_alerts
        settings.KeepFiles = self.keep_files
        settings.Proxy = len(self.proxy) > 0 and f'socks5://{self.proxy["host"]}:{self.proxy["port"]}' or ''
        settings.Seed = self.seed
        settings.AcceptPeerConnections = self.accept_peer_conn

        self.engine = gt.NewEngine(settings)

        def msg_logger():
            while self.run_message_logger:
                msg = self.engine.GetMsg()
                if msg not in ('__NO_MSG__', '__CLOSED__'):
                    xbmc.log(f'-= GORRENT =-: {msg}')
                time.sleep(0.1)
        self.message_logger = threading.Thread(target=msg_logger)
        self.message_logger.start()

        self._log('starting torrent')

        self.engine.StartTorrent(start_index)

        self._log('waiting alive status set')

        start = time.time()
        self.started = True
        initialized = False
        while (time.time() - start) < self.startup_timeout:
            time.sleep(0.1)
            if not self.is_alive():
                raise Error("Can't start gorrent2http, see log for details", Error.PROCESS_ERROR)
            try:
                # self.status(1)
                initialized = True
                break
            except Error:
                pass

        if not initialized:
            self.started = False
            raise Error("Can't start gorrent2http, time is out", Error.TIMEOUT)
        self._log("gorrent2http successfully started.")

    def pause(self):
        pass

    def resume(self):
        pass

    def check_torrent_error(self, status=None):
        if not status:
            status = self.status()
        if status.error:
            raise Error("Torrent error: %s" % status.error, Error.TORRENT_ERROR, reason=status.error)

    def status(self, timeout=10):
        stat = self.engine.Status()
        stat_kw = {
            'download_rate': stat.DownloadRate,
            'upload_rate': stat.UploadRate,
            'num_seeds': stat.Seeds,
            'name': '',
            'state': 0,
            'state_str': '',
            'error': '',
            'progress': 0,
            'total_download': 0,
            'total_upload': 0,
            'num_peers': 0,
            'total_seeds': 0,
            'total_peers': 0
        }
        return SessionStatus(**stat_kw)

    def list_from_info(self, media_types=None):
        try:
            info = gt.GetMetaFromFile(uri2path(self.uri))
        except:
            import traceback
            xbmc.log(f'info load exception: {traceback.format_exc()}')
            return []
        files = []
        if len(info.Files) > 0:
            for i in range(len(info.Files)):
                f = info.Files[i]

                uri = 'http://' + "%s:%s" % (self.bind_host, self.bind_port) + '/files/' + urllib.parse.quote(
                    '/'.join(f.Path))
                files.append({
                    'name': localize_path('/'.join(f.Path)),
                    'size': f.Length,
                    'offset': i,
                    'media_type': media_types is not None and detect_media_type(f.Path[-1]) or '',
                    'download': 0,
                    'progress': 0.0,
                    'save_path': '',
                    'url': uri
                })
        else:
            files.append({
                'name': localize_path(info.Name),
                'size': info.Length,
                'offset': 0,
                'media_type': media_types is not None and detect_media_type(info.Name) or '',
                'download': 0,
                'progress': 0.0,
                'save_path': '',
                'url': 'http://' + "%s:%s" % (self.bind_host, self.bind_port) + '/files/' + urllib.parse.quote(
                    info.Name)
            })
        res = []
        if len(files) > 0:
            res = [FileStatus(index=index, **f) for index, f in enumerate(files)]
        if media_types is not None:
            res = [fs for fs in res if fs.media_type in media_types]
        return res

    def file_status(self, file_index, timeout=10):
        try:
            efs = self.engine.FileStatus(file_index)
            fstat = {
                'name': localize_path('/'.join(efs.Name)),
                'progress': efs.Progress,
                'url': efs.Url,
                'save_path': '',
                'size': efs.Length,
                'offset': 0,
                'download': 0,
                'media_type': ''
            }
            return FileStatus(index=file_index, **fstat)
        except:
            raise Error("Requested file index (%d) is invalid" % (file_index,), Error.INVALID_FILE_INDEX,
                        file_index=file_index)

    def is_alive(self):
        return self.engine.IsAlive()

    def close(self):
        if self.is_alive():
            self._log("Shutting down gorrent2http...")
            self.engine.Stop()
            finished = False

            self.wait_on_close_timeout = 10

            if self.wait_on_close_timeout is not None:
                start = time.time()
                while (time.time() - start) < self.wait_on_close_timeout:
                    time.sleep(0.5)
                    if not self.is_alive():
                        finished = True
                        break
                if not finished:
                    self._log("PANIC: Timeout occurred while shutting down gorrent2http thread")
                else:
                    self._log("gorrent2http successfully shut down.")
                self.wait_on_close_timeout = None
            self._log("gorrent2http successfully shut down.")
        if self.message_logger is not None and self.message_logger.is_alive():
            self.run_message_logger = False
        self.message_logger = None
        self.started = False