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#
# sessionproxy.py
#
# Copyright (C) 2010 Andrew Resch <andrewresch@gmail.com>
#
# Deluge is free software.
#
# You may 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.
#
# deluge 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 deluge.    If not, write to:
# 	The Free Software Foundation, Inc.,
# 	51 Franklin Street, Fifth Floor
# 	Boston, MA  02110-1301, USA.
#
#    In addition, as a special exception, the copyright holders give
#    permission to link the code of portions of this program with the OpenSSL
#    library.
#    You must obey the GNU General Public License in all respects for all of
#    the code used other than OpenSSL. If you modify file(s) with this
#    exception, you may extend this exception to your version of the file(s),
#    but you are not obligated to do so. If you do not wish to do so, delete
#    this exception statement from your version. If you delete this exception
#    statement from all source files in the program, then also delete it here.
#
#

import logging
from twisted.internet.defer import maybeDeferred, succeed

import deluge.component as component
from deluge.ui.client import client
import time

log = logging.getLogger(__name__)

class SessionProxy(component.Component):
    """
    The SessionProxy component is used to cache session information client-side
    to reduce the number of RPCs needed to provide a rich user interface.

    It will query the Core for only changes in the status of the torrents
    and will try to satisfy client requests from the cache.

    """
    def __init__(self):
        log.debug("SessionProxy init..")
        component.Component.__init__(self, "SessionProxy", interval=5)

        # Set the cache time in seconds
        # This is how long data will be valid before re-fetching from the core
        self.cache_time = 1.5

        # Hold the torrents' status.. {torrent_id: [time, {status_dict}], ...}
        self.torrents = {}

        # Holds the time of the last key update.. {torrent_id: {key1, time, ...}, ...}
        self.cache_times = {}

        client.register_event_handler("TorrentStateChangedEvent", self.on_torrent_state_changed)
        client.register_event_handler("TorrentRemovedEvent", self.on_torrent_removed)
        client.register_event_handler("TorrentAddedEvent", self.on_torrent_added)

    def start(self):
        def on_get_session_state(torrent_ids):
            for torrent_id in torrent_ids:
                # Let's at least store the torrent ids with empty statuses
                # so that upcoming queries or status updates don't throw errors.
                self.torrents.setdefault(torrent_id, [time.time(), {}])
                self.cache_times.setdefault(torrent_id, {})
        return client.core.get_session_state().addCallback(on_get_session_state)

    def stop(self):
        client.deregister_event_handler("TorrentStateChangedEvent", self.on_torrent_state_changed)
        client.deregister_event_handler("TorrentRemovedEvent", self.on_torrent_removed)
        client.deregister_event_handler("TorrentAddedEvent", self.on_torrent_added)
        self.torrents = {}

    def create_status_dict(self, torrent_ids, keys):
        """
        Creates a status dict from the cache.

        :param torrent_ids: the torrent_ids
        :type torrent_ids: list of strings
        :param keys: the status keys
        :type keys: list of strings

        :returns: a dict with the status information for the *torrent_ids*
        :rtype: dict

        """
        sd = {}
        for torrent_id in torrent_ids:
            try:
                if keys:
                    sd[torrent_id] = dict([
                        (x, y) for x, y in self.torrents[torrent_id][1].iteritems()
                        if x in keys
                    ])
                else:
                    sd[torrent_id] = dict(self.torrents[torrent_id][1])
            except KeyError:
                continue

        return sd

    def get_torrent_status(self, torrent_id, keys):
        """
        Get a status dict for one torrent.

        :param torrent_id: the torrent_id
        :type torrent_id: string
        :param keys: the status keys
        :type keys: list of strings

        :returns: a dict of status information
        :rtype: dict

        """
        if torrent_id in self.torrents:
            # Keep track of keys we need to request from the core
            keys_to_get = []
            if not keys:
                keys = self.torrents[torrent_id][1].keys()

            for key in keys:
                if time.time() - self.cache_times[torrent_id].get(key, 0.0) > self.cache_time:
                    keys_to_get.append(key)

            if not keys_to_get:
                return succeed(
                    self.create_status_dict([torrent_id], keys)[torrent_id]
                )
            else:
                d = client.core.get_torrent_status(torrent_id, keys_to_get, True)
                def on_status(result, torrent_id):
                    t = time.time()
                    self.torrents[torrent_id][0] = t
                    self.torrents[torrent_id][1].update(result)
                    for key in keys_to_get:
                        self.cache_times[torrent_id][key] = t
                    return self.create_status_dict([torrent_id], keys)[torrent_id]
                return d.addCallback(on_status, torrent_id)
        else:
            d = client.core.get_torrent_status(torrent_id, keys, True)
            def on_status(result):
                if result:
                    t = time.time()
                    self.torrents[torrent_id] = (t, result)
                    self.cache_times[torrent_id] = {}
                    for key in result:
                        self.cache_times[torrent_id][key] = t

                return result
            return d.addCallback(on_status)

    def get_torrents_status(self, filter_dict, keys):
        """
        Get a dict of torrent statuses.

        The filter can take 2 keys, *state* and *id*.  The state filter can be
        one of the torrent states or the special one *Active*.  The *id* key is
        simply a list of torrent_ids.

        :param filter_dict: the filter used for this query
        :type filter_dict: dict
        :param keys: the status keys
        :type keys: list of strings

        :returns: a dict of torrent_ids and their status dicts
        :rtype: dict

        """
        # Helper functions and callbacks ---------------------------------------
        def on_status(result, torrent_ids, keys):
            # Update the internal torrent status dict with the update values
            t = time.time()
            for key, value in result.items():
                try:
                    self.torrents[key][0] = t
                    self.torrents[key][1].update(value)
                    for k in value:
                        self.cache_times[key][k] = t
                except KeyError:
                    #The torrent was removed
                    continue

            # Create the status dict
            if not torrent_ids:
                torrent_ids = result.keys()

            return self.create_status_dict(torrent_ids, keys)

        def find_torrents_to_fetch(torrent_ids):
            to_fetch = []
            t = time.time()
            for torrent_id in torrent_ids:
                torrent = self.torrents[torrent_id]
                if t - torrent[0] > self.cache_time:
                    to_fetch.append(torrent_id)
                else:
                    # We need to check if a key is expired
                    for key in keys:
                        if t - self.cache_times[torrent_id].get(key, 0.0) > self.cache_time:
                            to_fetch.append(torrent_id)
                            break

            return to_fetch
        #-----------------------------------------------------------------------

        if not filter_dict:
            # This means we want all the torrents status
            # We get a list of any torrent_ids with expired status dicts
            to_fetch = find_torrents_to_fetch(self.torrents.keys())
            if to_fetch:
                d = client.core.get_torrents_status({"id": to_fetch}, keys, True)
                return d.addCallback(on_status, self.torrents.keys(), keys)

            # Don't need to fetch anything
            return maybeDeferred(self.create_status_dict, self.torrents.keys(), keys)


        if len(filter_dict) == 1 and "id" in filter_dict:
            # At this point we should have a filter with just "id" in it
            to_fetch = find_torrents_to_fetch(filter_dict["id"])
            if to_fetch:
                d = client.core.get_torrents_status({"id": to_fetch}, keys, True)
                return d.addCallback(on_status, filter_dict["id"], keys)
            else:
                # Don't need to fetch anything, so just return data from the cache
                return maybeDeferred(self.create_status_dict, filter_dict["id"], keys)
        else:
            # This is a keyworded filter so lets just pass it onto the core
            # XXX: Add more caching here.
            d = client.core.get_torrents_status(filter_dict, keys, True)
            return d.addCallback(on_status, None, keys)

    def on_torrent_state_changed(self, torrent_id, state):
        if torrent_id in self.torrents:
            self.torrents[torrent_id][1].setdefault("state", state)
            self.cache_times.setdefault(torrent_id, {}).update(state=time.time())

    def on_torrent_added(self, torrent_id, from_state):
        self.torrents[torrent_id] = [time.time() - self.cache_time - 1, {}]
        self.cache_times[torrent_id] = {}
        def on_status(status):
            self.torrents[torrent_id][1].update(status)
            t = time.time()
            for key in status:
                self.cache_times[torrent_id][key] = t
        client.core.get_torrent_status(torrent_id, []).addCallback(on_status)

    def on_torrent_removed(self, torrent_id):
        if torrent_id in self.torrents:
            del self.torrents[torrent_id]
            del self.cache_times[torrent_id]