from base64 import b16encode, b32decode, b64encode
from distutils.version import LooseVersion
from hashlib import sha1
import httplib
import json
import os
import re
import urllib2

from couchpotato.core._base.downloader.main import DownloaderBase, ReleaseDownloadList
from couchpotato.core.helpers.encoding import isInt, sp
from couchpotato.core.helpers.variable import cleanHost
from couchpotato.core.logger import CPLog
from bencode import bencode as benc, bdecode


log = CPLog(__name__)

autoload = 'Hadouken'


class Hadouken(DownloaderBase):
    protocol = ['torrent', 'torrent_magnet']
    hadouken_api = None

    def connect(self):
        # Load host from config and split out port.
        host = cleanHost(self.conf('host'), protocol = False).split(':')

        if not isInt(host[1]):
            log.error('Config properties are not filled in correctly, port is missing.')
            return False

        if not self.conf('apikey'):
            log.error('Config properties are not filled in correctly, API key is missing.')
            return False

        self.hadouken_api = HadoukenAPI(host[0], port = host[1], api_key = self.conf('api_key'))

        return True

    def download(self, data = None, media = None, filedata = None):
        """ Send a torrent/nzb file to the downloader

        :param data: dict returned from provider
            Contains the release information
        :param media: media dict with information
            Used for creating the filename when possible
        :param filedata: downloaded torrent/nzb filedata
            The file gets downloaded in the searcher and send to this function
            This is done to have failed checking before using the downloader, so the downloader
            doesn't need to worry about that
        :return: boolean
            One faile returns false, but the downloaded should log his own errors
        """

        if not media: media = {}
        if not data: data = {}

        log.debug("Sending '%s' (%s) to Hadouken.", (data.get('name'), data.get('protocol')))

        if not self.connect():
            return False

        torrent_params = {}

        if self.conf('label'):
            torrent_params['label'] = self.conf('label')

        torrent_filename = self.createFileName(data, filedata, media)

        if data.get('protocol') == 'torrent_magnet':
            torrent_hash = re.findall('urn:btih:([\w]{32,40})', data.get('url'))[0].upper()
            torrent_params['trackers'] = self.torrent_trackers
            torrent_params['name'] = torrent_filename
        else:
            info = bdecode(filedata)['info']
            torrent_hash = sha1(benc(info)).hexdigest().upper()

        # Convert base 32 to hex
        if len(torrent_hash) == 32:
            torrent_hash = b16encode(b32decode(torrent_hash))

        # Send request to Hadouken
        if data.get('protocol') == 'torrent_magnet':
            self.hadouken_api.add_magnet_link(data.get('url'), torrent_params)
        else:
            self.hadouken_api.add_file(filedata, torrent_params)

        return self.downloadReturnId(torrent_hash)

    def test(self):
        """ Tests the given host:port and API key """

        if not self.connect():
            return False

        version = self.hadouken_api.get_version()

        if not version:
            log.error('Could not get Hadouken version.')
            return False

        # The minimum required version of Hadouken is 4.5.6.
        if LooseVersion(version) >= LooseVersion('4.5.6'):
            return True

        log.error('Hadouken v4.5.6 (or newer) required. Found v%s', version)
        return False

    def getAllDownloadStatus(self, ids):
        """ Get status of all active downloads

        :param ids: list of (mixed) downloader ids
            Used to match the releases for this downloader as there could be
            other downloaders active that it should ignore
        :return: list of releases
        """

        log.debug('Checking Hadouken download status.')

        if not self.connect():
            return []

        release_downloads = ReleaseDownloadList(self)
        queue = self.hadouken_api.get_by_hash_list(ids)

        if not queue:
            return []

        for torrent in queue:
            if torrent is None:
                continue

            torrent_filelist = self.hadouken_api.get_files_by_hash(torrent['InfoHash'])
            torrent_files = []

            save_path = torrent['SavePath']

            # The 'Path' key for each file_item contains
            # the full path to the single file relative to the
            # torrents save path.

            # For a single file torrent the result would be,
            # - Save path: "C:\Downloads"
            # - file_item['Path'] = "file1.iso"
            # Resulting path: "C:\Downloads\file1.iso"

            # For a multi file torrent the result would be,
            # - Save path: "C:\Downloads"
            # - file_item['Path'] = "dirname/file1.iso"
            # Resulting path: "C:\Downloads\dirname/file1.iso"

            for file_item in torrent_filelist:
                torrent_files.append(sp(os.path.join(save_path, file_item['Path'])))

            release_downloads.append({
                'id': torrent['InfoHash'].upper(),
                'name': torrent['Name'],
                'status': self.get_torrent_status(torrent),
                'seed_ratio': self.get_seed_ratio(torrent),
                'original_status': torrent['State'],
                'timeleft': -1,
                'folder': sp(save_path if len(torrent_files == 1) else os.path.join(save_path, torrent['Name'])),
                'files': torrent_files
            })

        return release_downloads

    def get_seed_ratio(self, torrent):
        """ Returns the seed ratio for a given torrent.

        Keyword arguments:
        torrent -- The torrent to calculate seed ratio for.
        """

        up = torrent['TotalUploadedBytes']
        down = torrent['TotalDownloadedBytes']

        if up > 0 and down > 0:
            return up / down

        return 0

    def get_torrent_status(self, torrent):
        """ Returns the CouchPotato status for a given torrent.

        Keyword arguments:
        torrent -- The torrent to translate status for.
        """

        if torrent['IsSeeding'] and torrent['IsFinished'] and torrent['Paused']:
            return 'completed'

        if torrent['IsSeeding']:
            return 'seeding'

        return 'busy'

    def pause(self, release_download, pause = True):
        """ Pauses or resumes the torrent specified by the ID field
        in release_download.

        Keyword arguments:
        release_download -- The CouchPotato release_download to pause/resume.
        pause -- Boolean indicating whether to pause or resume.
        """

        if not self.connect():
            return False

        return self.hadouken_api.pause(release_download['id'], pause)

    def removeFailed(self, release_download):
        """ Removes a failed torrent and also remove the data associated with it.

        Keyword arguments:
        release_download -- The CouchPotato release_download to remove.
        """

        log.info('%s failed downloading, deleting...', release_download['name'])

        if not self.connect():
            return False

        return self.hadouken_api.remove(release_download['id'], remove_data = True)

    def processComplete(self, release_download, delete_files = False):
        """ Removes the completed torrent from Hadouken and optionally removes the data
        associated with it.

        Keyword arguments:
        release_download -- The CouchPotato release_download to remove.
        delete_files: Boolean indicating whether to remove the associated data.
        """

        log.debug('Requesting Hadouken to remove the torrent %s%s.',
                  (release_download['name'], ' and cleanup the downloaded files' if delete_files else ''))

        if not self.connect():
            return False

        return self.hadouken_api.remove(release_download['id'], remove_data = delete_files)


class HadoukenAPI(object):
    def __init__(self, host = 'localhost', port = 7890, api_key = None):
        self.url = 'http://' + str(host) + ':' + str(port)
        self.api_key = api_key
        self.requestId = 0;

        self.opener = urllib2.build_opener()
        self.opener.addheaders = [('User-agent', 'couchpotato-hadouken-client/1.0'), ('Accept', 'application/json')]

        if not api_key:
            log.error('API key missing.')

    def add_file(self, filedata, torrent_params):
        """ Add a file to Hadouken with the specified parameters.

        Keyword arguments:
        filedata -- The binary torrent data.
        torrent_params -- Additional parameters for the file.
        """
        data = {
            'method': 'torrents.addFile',
            'params': [b64encode(filedata), torrent_params]
        }

        return self._request(data)

    def add_magnet_link(self, magnetLink, torrent_params):
        """ Add a magnet link to Hadouken with the specified parameters.

        Keyword arguments:
        magnetLink -- The magnet link to send.
        torrent_params -- Additional parameters for the magnet link.
        """
        data = {
            'method': 'torrents.addUrl',
            'params': [magnetLink, torrent_params]
        }

        return self._request(data)

    def get_by_hash_list(self, infoHashList):
        """ Gets a list of torrents filtered by the given info hash list.

        Keyword arguments:
        infoHashList -- A list of info hashes.
        """
        data = {
            'method': 'torrents.getByInfoHashList',
            'params': [infoHashList]
        }

        return self._request(data)

    def get_files_by_hash(self, infoHash):
        """ Gets a list of files for the torrent identified by the
        given info hash.

        Keyword arguments:
        infoHash -- The info hash of the torrent to return files for.
        """
        data = {
            'method': 'torrents.getFiles',
            'params': [infoHash]
        }

        return self._request(data)

    def get_version(self):
        """ Gets the version, commitish and build date of Hadouken. """
        data = {
            'method': 'core.getVersion',
            'params': None
        }

        result = self._request(data)

        if not result:
            return False

        return result['Version']

    def pause(self, infoHash, pause):
        """ Pauses/unpauses the torrent identified by the given info hash.

        Keyword arguments:
        infoHash -- The info hash of the torrent to operate on.
        pause -- If true, pauses the torrent. Otherwise resumes.
        """
        data = {
            'method': 'torrents.pause',
            'params': [infoHash]
        }

        if not pause:
            data['method'] = 'torrents.resume'

        return self._request(data)

    def remove(self, infoHash, remove_data = False):
        """ Removes the torrent identified by the given info hash and
        optionally removes the data as well.

        Keyword arguments:
        infoHash -- The info hash of the torrent to remove.
        remove_data -- If true, removes the data associated with the torrent.
        """
        data = {
            'method': 'torrents.remove',
            'params': [infoHash, remove_data]
        }

        return self._request(data)


    def _request(self, data):
        self.requestId += 1

        data['jsonrpc'] = '2.0'
        data['id'] = self.requestId

        request = urllib2.Request(self.url + '/jsonrpc', data = json.dumps(data))
        request.add_header('Authorization', 'Token ' + self.api_key)
        request.add_header('Content-Type', 'application/json')

        try:
            f = self.opener.open(request)
            response = f.read()
            f.close()

            obj = json.loads(response)

            if not 'error' in obj.keys():
                return obj['result']

            log.error('JSONRPC error, %s: %s', obj['error']['code'], obj['error']['message'])
        except httplib.InvalidURL as err:
            log.error('Invalid Hadouken host, check your config %s', err)
        except urllib2.HTTPError as err:
            if err.code == 401:
                log.error('Invalid Hadouken API key, check your config')
            else:
                log.error('Hadouken HTTPError: %s', err)
        except urllib2.URLError as err:
            log.error('Unable to connect to Hadouken %s', err)

        return False


config = [{
    'name': 'hadouken',
    'groups': [
        {
            'tab': 'downloaders',
            'list': 'download_providers',
            'name': 'hadouken',
            'label': 'Hadouken',
            'description': 'Use <a href="http://www.hdkn.net">Hadouken</a> (>= v4.5.6) to download torrents.',
            'wizard': True,
            'options': [
                {
                    'name': 'enabled',
                    'default': 0,
                    'type': 'enabler',
                    'radio_group': 'torrent'
                },
                {
                    'name': 'host',
                    'default': 'localhost:7890'
                },
                {
                    'name': 'api_key',
                    'label': 'API key',
                    'type': 'password'
                },
                {
                    'name': 'label',
                    'description': 'Label to add torrent as.'
                }
            ]
        }
    ]
}]