import ReactGA from 'react-ga';
import md5 from 'md5';

var helpers = require('./../../helpers');
var coreActions = require('../core/actions');
var spotifyActions = require('./actions');
var uiActions = require('../ui/actions');
var pusherActions = require('../pusher/actions');

const SpotifyMiddleware = (function(){

    /**
     * The actual middleware inteceptor
     **/
    return store => next => action => {
        var state = store.getState();

        switch(action.type){

            case 'SPOTIFY_AUTHORIZATION_GRANTED':
                if (store.getState().ui.allow_reporting){
	                ReactGA.event({category: 'Spotify', action: 'Authorization granted'});
	            }

                // Flush out the previous user's library
                store.dispatch(spotifyActions.flushLibrary());

                next(action);
                break;

            case 'SPOTIFY_AUTHORIZATION_REVOKED':
                if (store.getState().ui.allow_reporting){
	                var hashed_username = null
	                if (store.getState().spotify.me){
	                    hashed_username = md5(store.getState().spotify.me);
		                ReactGA.set({userId: hashed_username});
	                }
	                ReactGA.event({ category: 'Spotify', action: 'Authorization revoked', label: hashed_username});
	            }

                next(action);

                // Now dispatch a getMe to get the backend-provided user
                store.dispatch(spotifyActions.getMe());

                // Flush out the previous user's library
                store.dispatch(spotifyActions.flushLibrary());

                break;

            case 'SPOTIFY_IMPORT_AUTHORIZATION':
                if (store.getState().ui.allow_reporting){
	                var hashed_username = null
	                if (store.getState().spotify.me){
	                    hashed_username = md5(store.getState().spotify.me);
		                ReactGA.set({userId: hashed_username});
	                }
	                ReactGA.event({category: 'Spotify', action: 'Authorization imported', label: hashed_username});
	            }

                // Flush out the previous user's library
                store.dispatch(spotifyActions.flushLibrary());

                next(action);
                break;

            case 'SPOTIFY_RECOMMENDATIONS_LOADED':
                if (store.getState().ui.allow_reporting && action.seeds_uris){
                    ReactGA.event({ category: 'Spotify', action: 'Recommendations', label: action.seeds_uris.join(',') })
                }
                next(action)
                break;

            case 'SPOTIFY_USER_LOADED':
                if (store.getState().ui.allow_reporting && action.data){
                	ReactGA.event({ category: 'User', action: 'Load', label: action.data.uri });
                }
                next(action)
                break;

            case 'SPOTIFY_CREATE_PLAYLIST':
                store.dispatch(spotifyActions.createPlaylist(action.name, action.description, action.is_private, action.is_collaborative ))
                break;

            case 'SPOTIFY_REMOVE_PLAYLIST_TRACKS':
                var playlist = Object.assign({},state.core.playlists[action.key]);
                store.dispatch(spotifyActions.deleteTracksFromPlaylist(playlist.uri, playlist.snapshot_id, action.tracks_indexes ))
                break;


            case 'SPOTIFY_ADD_PLAYLIST_TRACKS':
                store.dispatch(spotifyActions.addTracksToPlaylist(action.key, action.tracks_uris ))
                break;

            case 'SPOTIFY_REORDER_PLAYLIST_TRACKS':
                store.dispatch(spotifyActions.reorderPlaylistTracks(action.key, action.range_start, action.range_length, action.insert_before, action.snapshot_id ))
                break;

            case 'SPOTIFY_SAVE_PLAYLIST':
                store.dispatch(spotifyActions.savePlaylist(action.key, action.name, action.description, action.is_public, action.is_collaborative, action.image))
                break;

            case 'SPOTIFY_NEW_RELEASES_LOADED':
                store.dispatch({
                    type: 'ALBUMS_LOADED',
                    albums: action.data.albums.items
                });
                store.dispatch({
                    type: 'NEW_RELEASES_LOADED',
                    uris: helpers.arrayOf('uri',action.data.albums.items),
                    more: action.data.albums.next,
                    total: action.data.albums.total
                });
                break

            case 'SPOTIFY_ARTIST_ALBUMS_LOADED':
                store.dispatch(coreActions.albumsLoaded(action.data.items));
                store.dispatch({
                    type: 'ARTIST_ALBUMS_LOADED',
                    artist_uri: action.artist_uri,
                    albums_uris: helpers.arrayOf('uri',action.data.items),
                    more: action.data.next,
                    total: action.data.total
                });
                break

            case 'SPOTIFY_USER_PLAYLISTS_LOADED':
                var playlists = []
                for(var i = 0; i < action.data.items.length; i++){
                    var playlist = Object.assign(
                        {},
                        action.data.items[i],
                        {
                            tracks_total: action.data.items[i].tracks.total
                        }
                    )

                    // remove our tracklist. It'll overwrite any full records otherwise
                    delete playlist.tracks

                    playlists.push(playlist)
                }

                store.dispatch({
                    type: 'PLAYLISTS_LOADED',
                    playlists: playlists
                });

                store.dispatch({
                    type: 'USER_PLAYLISTS_LOADED',
                    key: action.key,
                    uris: helpers.arrayOf('uri',playlists),
                    more: action.data.next,
                    total: action.data.total
                });
                break

            case 'SPOTIFY_CATEGORY_PLAYLISTS_LOADED':
                var playlists = []
                for(var i = 0; i < action.data.playlists.items.length; i++){
                    var playlist = Object.assign(
                        {},
                        action.data.playlists.items[i],
                        {
                            tracks_total: action.data.playlists.items[i].tracks.total
                        }
                    )

                    // remove our tracklist. It'll overwrite any full records otherwise
                    delete playlist.tracks

                    playlists.push(playlist)
                }

                store.dispatch({
                    type: 'PLAYLISTS_LOADED',
                    playlists: playlists
                });

                store.dispatch({
                    type: 'CATEGORY_PLAYLISTS_LOADED',
                    key: action.key,
                    uris: helpers.arrayOf('uri',playlists),
                    more: action.data.playlists.next,
                    total: action.data.playlists.total
                });
                break

            case 'SPOTIFY_GET_LIBRARY_PLAYLISTS_PROCESSOR':
                store.dispatch(spotifyActions.getLibraryPlaylistsProcessor(action.data))
                break

            case 'SPOTIFY_LIBRARY_PLAYLISTS_LOADED':
                var playlists = []
                for(var i = 0; i < action.playlists.length; i++){
                    var playlist = Object.assign(
                        {},
                        action.playlists[i],
                        {
                            source: 'spotify',
                            in_library: true,    // assumed because we asked for library items
                            tracks_total: action.playlists[i].tracks.total
                        }
                    )

                    // remove our tracklist. It'll overwrite any full records otherwise
                    delete playlist.tracks

                    playlists.push(playlist)
                }

                store.dispatch({
                    type: 'PLAYLISTS_LOADED',
                    playlists: playlists
                });

                // Append our action with the uris. This gets handed down to subsequent middleware and our reducer.
                action.uris = helpers.arrayOf('uri',playlists)
                next(action)
                break

            case 'SPOTIFY_GET_LIBRARY_ARTISTS_PROCESSOR':
                store.dispatch(spotifyActions.getLibraryArtistsProcessor(action.data))
                break

            case 'SPOTIFY_LIBRARY_ARTISTS_LOADED':
                var artists = []
                for (var i = 0; i < action.artists.length; i++){
                    artists.push(
                        Object.assign(
                            {},
                            action.artists[i],
                            {
                                source: 'spotify',
                                in_library: true     // assumed because we asked for library items
                            }
                        )
                    )
                }
                store.dispatch({
                    type: 'ARTISTS_LOADED',
                    artists: artists
                });

                // Append our action with the uris. This gets handed down to subsequent middleware and our reducer.
                action.uris = helpers.arrayOf('uri',artists)
                next(action)
                break

            case 'SPOTIFY_GET_LIBRARY_ALBUMS_PROCESSOR':
                store.dispatch(spotifyActions.getLibraryAlbumsProcessor(action.data))
                break

            case 'SPOTIFY_GET_PLAYLIST_TRACKS_AND_PLAY_PROCESSOR':
                store.dispatch(spotifyActions.getPlaylistTracksAndPlayProcessor(action.data))
                break

            case 'SPOTIFY_GET_LIBRARY_TRACKS_AND_PLAY_PROCESSOR':
                store.dispatch(spotifyActions.getLibraryTracksAndPlayProcessor(action.data))
                break

            case 'SPOTIFY_LIBRARY_ALBUMS_LOADED':
                var albums = []
                for (var i = 0; i < action.albums.length; i++){
                    albums.push(
                        Object.assign(
                            {},
                            action.albums[i].album,
                            {
                                in_library: true,    // assumed because we asked for library items
                                source: 'spotify',
                                added_at: action.albums[i].added_at,
                                tracks: action.albums[i].album.tracks.items,
                                tracks_more: action.albums[i].album.tracks.next,
                                tracks_total: action.albums[i].album.tracks.total
                            }
                        )
                    )
                }

                store.dispatch({
                    type: 'ALBUMS_LOADED',
                    albums: albums
                });

                // Append our action with the uris. This gets handed down to subsequent middleware and our reducer.
                action.uris = helpers.arrayOf('uri',albums)
                next(action)
                break

            case 'SPOTIFY_FAVORITES_LOADED':
                if (action.artists.length > 0){
                    store.dispatch({
                        type: 'ARTISTS_LOADED',
                        artists: action.artists
                    })
                    action.artists_uris = helpers.arrayOf('uri',action.artists)
                }
                if (action.tracks.length > 0){
                    store.dispatch({
                        type: 'TRACKS_LOADED',
                        tracks: action.tracks
                    })
                    action.tracks_uris = helpers.arrayOf('uri',action.tracks)
                }
                next(action)
                break

            case 'SPOTIFY_LIBRARY_TRACKS_LOADED':
            case 'SPOTIFY_LIBRARY_TRACKS_LOADED_MORE':
                if (action.data){
                    store.dispatch({
                        type: 'TRACKS_LOADED',
                        tracks: action.data.items
                    });
                }
                next(action);
                break;

            case 'SPOTIFY_TRACK_LOADED':
                store.dispatch({
                    type: 'TRACKS_LOADED',
                    tracks: [action.data]
                });
                next(action);
                break


            /**
             * Searching
             * More results are lazy-loaded on demand, based on the _more URL
             **/

            case 'SEARCH_STARTED':
                store.dispatch({ 
                    type: 'SPOTIFY_CLEAR_SEARCH_RESULTS'
                });
                next(action)
                break

            case 'SPOTIFY_SEARCH_RESULTS_LOADED_MORE_TRACKS':
                store.dispatch({
                    type: 'SPOTIFY_SEARCH_RESULTS_LOADED',
                    context: 'tracks',
                    results: helpers.formatTracks(action.data.tracks.items),
                    more: action.data.tracks.next
                });
                break

            case 'SPOTIFY_SEARCH_RESULTS_LOADED_MORE_ARTISTS':
                
                store.dispatch({
                    type: 'ARTISTS_LOADED',
                    artists: action.data.artists.items
                });

                store.dispatch({
                    type: 'SPOTIFY_SEARCH_RESULTS_LOADED',
                    context: 'artists',
                    results: helpers.arrayOf('uri',action.data.playlists.items),
                    more: action.data.playlists.next
                });
                break

            case 'SPOTIFY_SEARCH_RESULTS_LOADED_MORE_ALBUMS':

                store.dispatch({
                    type: 'ALBUMS_LOADED',
                    albums: action.data.albums.items
                });

                store.dispatch({
                    type: 'SPOTIFY_SEARCH_RESULTS_LOADED',
                    context: 'playlists',
                    results: helpers.arrayOf('uri',action.data.albums.items),
                    more: action.data.albums.next
                });
                break

            case 'SPOTIFY_SEARCH_RESULTS_LOADED_MORE_PLAYLISTS':

                var playlists = []
                for (var i = 0; i < action.data.playlists.items.length; i++){
                    playlists.push(Object.assign(
                        {},
                        action.data.playlists.items[i],
                        {
                            tracks_total: action.data.playlists.items[i].tracks.total
                        }
                    ))
                }

                store.dispatch({
                    type: 'PLAYLISTS_LOADED',
                    playlists: playlists
                });

                store.dispatch({
                    type: 'SPOTIFY_SEARCH_RESULTS_LOADED',
                    context: 'playlists',
                    results: helpers.arrayOf('uri',action.data.playlists.items),
                    more: action.data.playlists.next
                });
                break


            case 'SPOTIFY_ME_LOADED':

                // We've loaded 'me' and we are Anonymous currently
                if (action.data && store.getState().pusher.username == 'Anonymous'){
                    if (action.data.display_name !== null){
                        var name = action.data.display_name;
                    } else {
                        var name = action.data.id;
                    }

                    // Use 'me' name as my Pusher username
                    store.dispatch(pusherActions.setUsername(name));
                }

                if (store.getState().ui.allow_reporting){
	                var hashed_username = md5(action.data.id);
	                ReactGA.set({userId: hashed_username});
	                ReactGA.event({category: 'Spotify', action: 'Authorization verified', label: hashed_username});
	            }

                store.dispatch({
                    type: 'USERS_LOADED',
                    users: [action.data]
                });

                next(action);
                break;

            // This action is irrelevant to us, pass it on to the next middleware
            default:
                return next(action);
        }
    }

})();

export default SpotifyMiddleware