import xbmc
import xbmcgui

import random
import time
import threading

from resources.lib import manage
from resources.lib.common import utils

skin_string_pattern = 'autowidget-{}-{}'
_properties = ['context.autowidget']

_thread = None


class RefreshService(xbmc.Monitor):

    def __init__(self):
        """Starts all of the actions of AutoWidget's service."""
        super(RefreshService, self).__init__()
        utils.log('+++++ STARTING AUTOWIDGET SERVICE +++++', 'info')
        self.player = Player()
        utils.ensure_addon_data()
        self._update_properties()
        self._clean_widgets()
        self._update_widgets()
        # Shutting down. Close thread
        if _thread is not None:
            _thread.stop()

    def onSettingsChanged(self):
        self._update_properties()

    def _update_properties(self):
        for property in _properties:
            setting = utils.get_setting(property)
            utils.log('{}: {}'.format(property, setting))
            if setting is not None:
                utils.set_property(property, setting)
                utils.log('Property {0} set'.format(property))
            else:
                utils.clear_property(property)
                utils.log('Property {0} cleared'.format(property))

        self._reload_settings()
        
    def _reload_settings(self):
        self.refresh_enabled = utils.get_setting_int('service.refresh_enabled')
        self.refresh_duration = utils.get_setting_float('service.refresh_duration')
        self.refresh_notification = utils.get_setting_int('service.refresh_notification')
        self.refresh_sound = utils.get_setting_bool('service.refresh_sound')
        
        utils.update_container(True)
        
    def _clean_widgets(self):
        for widget_def in manage.find_defined_widgets():
            if not manage.clean(widget_def['id']):
                utils.log('Resetting {}'.format(widget_def['id']))
                update_path(widget_def['id'], None, 'reset')

    def tick(self, step, max, abort_check = lambda: False):
        "yield every Step secords until you get to Max or abort_check returns True"
        i = 0
        while i < max and not abort_check():
            if self.waitForAbort(step):
                break
            i += step
            yield i

    def _update_widgets(self):
        self._refresh(True)
        
        while not self.abortRequested():
            for _ in self.tick(15, 60*15):
                # TODO: somehow delay to all other plugins loaded?
                unrefreshed_widgets = set()
                for hash, widget_ids in utils.next_cache_queue():
                    effected_widgets = cache_and_update(widget_ids)
                    utils.remove_cache_queue(hash) # Just in queued path's widget defintion has changed and it didn't update this path
                    unrefreshed_widgets = unrefreshed_widgets.union(effected_widgets).difference(set(widget_ids))
                    # # wait 5s or for the skin to reload the widget
                    # # this should reduce churn at startup where widgets take too long too long show up
                    # before_update = time.time() # TODO: have .access file so we can put above update
                    # while _ in self.tick(1, 10, lambda: utils.last_read(hash) > before_update):
                    #     pass
                    # utils.log("paused queue until read {:.2} for {}".format(utils.last_read(hash)-before_update, hash[:5]), 'info') 
                    if self.abortRequested():
                        break
                for widget_id in unrefreshed_widgets:
                    widget_def = manage.get_widget_by_id(widget_id)
                    if not widget_def:
                        continue
                    _update_strings(widget_def)

            if self.abortRequested():
                break

            if not self._refresh():
                continue
                
    def _refresh(self, startup=False):
        if self.refresh_enabled in [0, 1] and manage.find_defined_widgets():
            notification = False
            if self.refresh_enabled == 1:
                if self.player.isPlayingVideo():
                    utils.log('+++++ PLAYBACK DETECTED, SKIPPING AUTOWIDGET REFRESH +++++',
                              'info')
                    return
            else:
                if self.refresh_notification == 0:
                    notification = True
                elif self.refresh_notification == 1:
                    if not self.player.isPlayingVideo():
                        notification = True
            
            utils.log('+++++ REFRESHING AUTOWIDGETS +++++', 'info')
            refresh_paths(notify=notification and not startup)
        else:
            utils.log('+++++ AUTOWIDGET REFRESHING NOT ENABLED +++++',
                      'info')

def _update_strings(widget_def):
    refresh = skin_string_pattern.format(widget_def['id'], 'refresh')
    utils.set_property(refresh, '{}'.format(time.time()))
    utils.log('Refreshing widget {} to display {}'.format(widget_def['id'],
                                                       widget_def['path']),
                                                       'debug')

def update_path(widget_id, target, path=None):
    widget_def = manage.get_widget_by_id(widget_id)
    if not widget_def:
        return
    
    stack = widget_def.get('stack', [])

    if target == 'next' and path:
        utils.log('Next Page selected from {}'.format(widget_id), 'debug')
        path_def = widget_def['path']
        if isinstance(path_def, dict):
            widget_def['label'] = path_def['label']
        
        stack.append(widget_def['path'])
        widget_def['stack'] = stack
        widget_def['path'] = path
    elif target == 'back' and widget_def.get('stack'):
        utils.log('Previous Page selected from {}'.format(widget_id), 'debug')
        widget_def['path'] = widget_def['stack'][-1]
        widget_def['stack'] = widget_def['stack'][:-1]
        
        if len(widget_def['stack']) == 0:
            widget_def['label'] = ''
    elif target == 'reset':
            if len(stack) > 0:
                widget_def['path'] = widget_def['stack'][0]
                widget_def['stack'] = []
                widget_def['label'] = ''
    
    action = widget_def['path'] if widget_def['action'] != 'merged' else 'merged'
    if isinstance(widget_def['path'], dict):
        action = widget_def['path']['file']['file']
    manage.save_path_details(widget_def)
    _update_strings(widget_def)
    utils.update_container(True)
    back_to_top(target)


def back_to_top(target):
    if target != 'next':
        return
    actions = ['back', 'firstpage', 'right']
    for action in actions:
        utils.call_builtin('Action({})'.format(action), 100)


def refresh(widget_id, widget_def=None, paths=None, force=False, single=False):
    if not widget_def:
        widget_def = manage.get_widget_by_id(widget_id)
    
    if widget_def['action'] in ['static', 'merged']:
        return paths
    
    current_time = time.time()
    updated_at = widget_def.get('updated', 0)
    
    default_refresh = utils.get_setting_float('service.refresh_duration')
    refresh_duration = float(widget_def.get('refresh', default_refresh))
    
    if updated_at <= current_time - (3600 * refresh_duration) or force:
        group_id = widget_def['group']
        action = widget_def.get('action')
        current = int(widget_def.get('current', -1))
        widget_def['stack'] = []
        widget_def['label'] = ''
        
        if not paths:
            paths = manage.find_defined_paths(group_id)
        
        if action:
            if len(paths) > 0:
                next = 0
                if action == 'next':
                    next = (current + 1) % len(paths)
                elif action == 'random':
                    random.shuffle(paths)
                    next = random.randrange(len(paths))
                    
                widget_def['current'] = next
                path_def = paths[next]
                paths.remove(paths[next])
                
                widget_def['path'] = path_def
                if widget_def['path']:
                    widget_def['updated'] = 0 if force else current_time
                        
                    manage.save_path_details(widget_def)
                    _update_strings(widget_def)
                    
        if single:
            utils.update_container(True)
    
    return paths


def refresh_paths(notify=False, force=False):
    if notify:
        dialog = xbmcgui.Dialog()
        dialog.notification('AutoWidget', utils.get_string(32033),
                            sound=utils.get_setting_bool('service.refresh_sound'))

    for group_def in manage.find_defined_groups():
        paths = []
        
        widgets = manage.find_defined_widgets(group_def['id'])
        for widget_def in widgets:
            paths = refresh(widget_def['id'], widget_def=widget_def, paths=paths, force=force)

    utils.update_container(True)

    return True, 'AutoWidget'


def get_files_list(path, titles=None, widget_id=None):
    if not titles:
        titles = []

    hash = utils.path2hash(path)
    _, files, _ = utils.cache_expiry(hash, widget_id)
    if files is None:
        # We had no old content so have to block and get it now
        utils.log("Blocking cache path read: {}".format(hash[:5]), "info")
        files, changed = utils.cache_files(path, widget_id)
        
    new_files = []
    if 'error' not in files:
        files = files.get('result').get('files')
        if not files:
            utils.log('No items found for {}'.format(path))
            return
            
        filtered_files = [x for x in files if x['title'] not in titles]
        for file in filtered_files:
            new_file = {k: v for k, v in file.items() if v not in [None, '', -1, [], {}]}
            if 'art' in new_file:
                for art in new_file['art']:
                    new_file['art'][art] = utils.clean_artwork_url(file['art'][art])
            new_files.append(new_file)
                
        return new_files

def cache_and_update(widget_ids):
    """ a widget might have many paths. Ensure each path is either queued for an update
    or is expired and if so force it to be refreshed. When going through the queue this 
    could mean we refresh paths that other widgets also use. These will then be skipped.
    """

    assert widget_ids
    effected_widgets = set()
    for widget_id in widget_ids:
        widget_def = manage.get_widget_by_id(widget_id)
        if not widget_def:
            continue
        changed = False
        widget_path = widget_def.get('path', {})  
        utils.log("trying to update {} with widget def {}".format(widget_id,widget_def),"inspect")
        if type(widget_path) != list:
            widget_path = [widget_path]
        for path in widget_path:
            if isinstance(path, dict):
                _label = path['label']
                path = path['file']['file']
            hash = utils.path2hash(path)
            # TODO: we might be updating paths used by widgets that weren't initiall queued.
            # We need to return those and ensure they get refreshed also.
            effected_widgets = effected_widgets.union(utils.widgets_for_path(path))
            if utils.is_cache_queue(hash):
                # we need to update this path regardless
                new_files, files_changed = utils.cache_files(path, widget_id)
                changed = changed or files_changed
                utils.remove_cache_queue(hash)
            # else:
            #     # double check this hasn't been updated already when updating another widget
            #     expiry, _  = utils.cache_expiry(hash, widget_id, no_queue=True)
            #     if expiry <= time.time():
            #         utils.cache_files(path, widget_id)
            #     else:
            #         pass # Skipping this path because its already been updated
        # TODO: only need to do that if a path has changed which we can tell from the history
        if changed:
            _update_strings(widget_def)
    return effected_widgets



# Get info on whats playing and use it to update the right widgets when playback stopped
class Player(xbmc.Player):
    def __init__(self):
        super(Player, self).__init__()
        self.publish = None
        self.totalTime = -1
        self.playingTime = 0
        self.info = {}

    def playing_type(self):
        """
        @return: [music|movie|episode|stream|liveTV|recordedTV|PVRradio|unknown]
        """
        # TODO: taken from callbacks plugin. have as a dependcy instead?
        substrings = ['-trailer', 'http://']
        isMovie = False
        if self.isPlayingAudio():
            return "music"
        else:
            if xbmc.getCondVisibility('VideoPlayer.Content(movies)'):
                isMovie = True
        try:
            filename = self.getPlayingFile()
        except RuntimeError:
            filename = ''
        if filename != '':
            if filename[0:3] == 'pvr':
                if xbmc.getCondVisibility('Pvr.IsPlayingTv'):
                    return 'liveTV'
                elif xbmc.getCondVisibility('Pvr.IsPlayingRecording'):
                    return 'recordedTV'
                elif xbmc.getCondVisibility('Pvr.IsPlayingRadio'):
                    return 'PVRradio'
                else:
                    for string in substrings:
                        if string in filename:
                            isMovie = False
                            break
        if isMovie:
            return "movie"
        elif xbmc.getCondVisibility('VideoPlayer.Content(episodes)'):
            # Check for tv show title and season to make sure it's really an episode
            if xbmc.getInfoLabel('VideoPlayer.Season') != "" and xbmc.getInfoLabel('VideoPlayer.TVShowTitle') != "":
                return "episode"
        elif xbmc.getCondVisibility('Player.IsInternetStream'):
            return 'stream'
        else:
            return 'unknown'


    def onPlayBackStarted(self):
        # self.getInfo()
        try:
            self.totalTime = self.getTotalTime()
        except RuntimeError:
            self.totalTime = -1
        finally:
            if self.totalTime == 0:
                self.totalTime = -1
        # self.recordPlay()
        self.type = self.playing_type()

        def update_playback_time(self=self):
            while self.isPlaying():
                self.playingTime = self.getTime()
                time.sleep(1)
        threading.Thread(target=update_playback_time).start()


    def onPlayBackEnded(self):
        #import ptvsd; ptvsd.enable_attach(address=('127.0.0.1', 5678)); ptvsd.wait_for_attach()
        utils.log("AutoWidget onPlayBackEnded callback", 'notice')

        # Once a playback ends. 
        # Work out which cached paths are most likely to change based on playback history

        # Record playback in a history db so we can potentially use this for future predictions.
        try:
            tt = self.totalTime
            tp = self.playingTime
            pp = int(100 * tp / tt)
        except RuntimeError:
            pp = -1
        except OverflowError:
            pp = -1
        self.totalTime = -1.0
        self.playingTime = 0.0
        self.info = {}
        utils.save_playback_history(self.type, pp)
        utils.log("recorded playback of {}% {}".format(pp, self.type), 'notice')

        # wait for a bit so scrobing can happen
        time.sleep(5) 
        for hash in utils.widgets_changed_by_watching(self.type):
            # Queue them for refresh
            utils.push_cache_queue(hash)
            utils.log("Queued cache update: {}".format(hash[:5]), 'notice')

    def onPlayBackStopped(self):
        self.onPlayBackEnded()

    def onPlayBackSeek(self, time, seekOffset):
        self.playingTime = time

    def onPlayBackPaused(self):
        pass

    def onPlayBackResumed(self):
        pass

    def onPlayBackSeekChapter(self, chapter):
        pass

    def onPlayBackSpeedChanged(self, speed):
        pass

    def onQueueNextItem(self):
        pass