// Copyright (c) 2015 Mattermost, Inc. All Rights Reserved.
// See License.txt for license information.

import $ from 'jquery';
import UserStore from 'stores/user_store.jsx';
import TeamStore from 'stores/team_store.jsx';
import PostStore from 'stores/post_store.jsx';
import ChannelStore from 'stores/channel_store.jsx';
import BrowserStore from 'stores/browser_store.jsx';
import ErrorStore from 'stores/error_store.jsx';
import NotificationStore from 'stores/notification_store.jsx'; //eslint-disable-line no-unused-vars

import Client from 'utils/web_client.jsx';
import WebSocketClient from 'utils/websocket_client.jsx';
import * as Utils from 'utils/utils.jsx';
import * as AsyncClient from 'utils/async_client.jsx';
import * as GlobalActions from 'actions/global_actions.jsx';
import * as UserActions from 'actions/user_actions.jsx';
import {handleNewPost} from 'actions/post_actions.jsx';

import Constants from 'utils/constants.jsx';
const SocketEvents = Constants.SocketEvents;

import {browserHistory} from 'react-router/es6';

const MAX_WEBSOCKET_FAILS = 7;

export function initialize() {
    if (window.WebSocket) {
        let protocol = 'ws://';
        if (window.location.protocol === 'https:') {
            protocol = 'wss://';
        }

        const connUrl = protocol + location.host + ((/:\d+/).test(location.host) ? '' : Utils.getWebsocketPort(protocol)) + Client.getUsersRoute() + '/websocket';

        WebSocketClient.initialize(connUrl);
        WebSocketClient.setEventCallback(handleEvent);
        WebSocketClient.setReconnectCallback(handleReconnect);
        WebSocketClient.setCloseCallback(handleClose);
    }
}

export function close() {
    WebSocketClient.close();
}

function handleReconnect() {
    AsyncClient.getChannels();
    AsyncClient.getPosts(ChannelStore.getCurrentId());
    ErrorStore.clearLastError();
    ErrorStore.emitChange();
}

function handleClose(failCount) {
    if (failCount > MAX_WEBSOCKET_FAILS) {
        ErrorStore.storeLastError({message: Utils.localizeMessage('channel_loader.socketError', 'Please check connection, Mattermost unreachable. If issue persists, ask administrator to check WebSocket port.')});
    }

    ErrorStore.setConnectionErrorCount(failCount);
    ErrorStore.emitChange();
}

function handleEvent(msg) {
    switch (msg.event) {
    case SocketEvents.POSTED:
    case SocketEvents.EPHEMERAL_MESSAGE:
        handleNewPostEvent(msg);
        break;

    case SocketEvents.POST_EDITED:
        handlePostEditEvent(msg);
        break;

    case SocketEvents.POST_DELETED:
        handlePostDeleteEvent(msg);
        break;

    case SocketEvents.NEW_USER:
        handleNewUserEvent();
        break;

    case SocketEvents.LEAVE_TEAM:
        handleLeaveTeamEvent(msg);
        break;

    case SocketEvents.USER_ADDED:
        handleUserAddedEvent(msg);
        break;

    case SocketEvents.USER_REMOVED:
        handleUserRemovedEvent(msg);
        break;

    case SocketEvents.CHANNEL_VIEWED:
        handleChannelViewedEvent(msg);
        break;

    case SocketEvents.CHANNEL_DELETED:
        handleChannelDeletedEvent(msg);
        break;

    case SocketEvents.DIRECT_ADDED:
        handleDirectAddedEvent(msg);
        break;

    case SocketEvents.PREFERENCE_CHANGED:
        handlePreferenceChangedEvent(msg);
        break;

    case SocketEvents.TYPING:
        handleUserTypingEvent(msg);
        break;

    default:
    }
}

function handleNewPostEvent(msg) {
    const post = JSON.parse(msg.data.post);
    handleNewPost(post, msg);
}

function handlePostEditEvent(msg) {
    // Store post
    const post = JSON.parse(msg.data.post);
    PostStore.storePost(post);
    PostStore.emitChange();

    // Update channel state
    if (ChannelStore.getCurrentId() === msg.channel_id) {
        if (window.isActive) {
            AsyncClient.updateLastViewedAt();
        }
    }
}

function handlePostDeleteEvent(msg) {
    const post = JSON.parse(msg.data.post);
    GlobalActions.emitPostDeletedEvent(post);
}

function handleNewUserEvent() {
    AsyncClient.getProfiles();
    AsyncClient.getDirectProfiles();
    AsyncClient.getChannelExtraInfo();
}

function handleLeaveTeamEvent(msg) {
    if (UserStore.getCurrentId() === msg.user_id) {
        TeamStore.removeTeamMember(msg.team_id);

        // if the are on the team begin removed redirect them to the root
        if (TeamStore.getCurrentId() === msg.team_id) {
            browserHistory.push('/');
        }
    } else if (TeamStore.getCurrentId() === msg.team_id) {
        UserActions.getMoreDmList();
        GlobalActions.emitProfilesForDmList();
    }
}

function handleDirectAddedEvent(msg) {
    AsyncClient.getChannel(msg.channel_id);
    AsyncClient.getDirectProfiles();
}

function handleUserAddedEvent(msg) {
    if (ChannelStore.getCurrentId() === msg.channel_id) {
        AsyncClient.getChannelExtraInfo();
    }

    if (TeamStore.getCurrentId() === msg.team_id && UserStore.getCurrentId() === msg.user_id) {
        AsyncClient.getChannel(msg.channel_id);
    }
}

function handleUserRemovedEvent(msg) {
    if (UserStore.getCurrentId() === msg.user_id) {
        AsyncClient.getChannels();

        if (msg.data.remover_id !== msg.user_id &&
                msg.channel_id === ChannelStore.getCurrentId() &&
                $('#removed_from_channel').length > 0) {
            var sentState = {};
            sentState.channelName = ChannelStore.getCurrent().display_name;
            sentState.remover = UserStore.getProfile(msg.data.remover_id).username;

            BrowserStore.setItem('channel-removed-state', sentState);
            $('#removed_from_channel').modal('show');
        }
    } else if (ChannelStore.getCurrentId() === msg.channel_id) {
        AsyncClient.getChannelExtraInfo();
    }
}

function handleChannelViewedEvent(msg) {
    // Useful for when multiple devices have the app open to different channels
    if (TeamStore.getCurrentId() === msg.team_id &&
            ChannelStore.getCurrentId() !== msg.channel_id &&
            UserStore.getCurrentId() === msg.user_id) {
        AsyncClient.getChannel(msg.channel_id);
    }
}

function handleChannelDeletedEvent(msg) {
    if (ChannelStore.getCurrentId() === msg.channel_id) {
        const teamUrl = TeamStore.getCurrentTeamRelativeUrl();
        browserHistory.push(teamUrl + '/channels/' + Constants.DEFAULT_CHANNEL);
    }
    AsyncClient.getChannels();
}

function handlePreferenceChangedEvent(msg) {
    const preference = JSON.parse(msg.data.preference);
    GlobalActions.emitPreferenceChangedEvent(preference);
}

function handleUserTypingEvent(msg) {
    GlobalActions.emitRemoteUserTypingEvent(msg.channel_id, msg.user_id, msg.data.parent_id);
}