/*
Copyright 2017 New Vector Ltd.

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
import React from 'react';
import { _t } from '../../../languageHandler';
import sdk from '../../../index';
import GroupStore from '../../../stores/GroupStore';
import PropTypes from 'prop-types';

const INITIAL_LOAD_NUM_ROOMS = 30;

export default React.createClass({
    propTypes: {
        groupId: PropTypes.string.isRequired,
    },

    getInitialState: function() {
        return {
            rooms: null,
            truncateAt: INITIAL_LOAD_NUM_ROOMS,
            searchQuery: "",
        };
    },

    componentWillMount: function() {
        this._unmounted = false;
        this._initGroupStore(this.props.groupId);
    },

    componentWillUnmount() {
        this._unmounted = true;
        this._unregisterGroupStore();
    },

    _unregisterGroupStore() {
        GroupStore.unregisterListener(this.onGroupStoreUpdated);
    },

    _initGroupStore: function(groupId) {
        GroupStore.registerListener(groupId, this.onGroupStoreUpdated);
        // XXX: This should be more fluxy - let's get the error from GroupStore .getError or something
        // XXX: This is also leaked - we should remove it when unmounting
        GroupStore.on('error', (err, errorGroupId) => {
            if (errorGroupId !== groupId) return;
            this.setState({
                rooms: null,
            });
        });
    },

    onGroupStoreUpdated: function() {
        if (this._unmounted) return;
        this.setState({
            rooms: GroupStore.getGroupRooms(this.props.groupId),
        });
    },

    _createOverflowTile: function(overflowCount, totalCount) {
        // For now we'll pretend this is any entity. It should probably be a separate tile.
        const EntityTile = sdk.getComponent("rooms.EntityTile");
        const BaseAvatar = sdk.getComponent("avatars.BaseAvatar");
        const text = _t("and %(count)s others...", { count: overflowCount });
        return (
            <EntityTile className="mx_EntityTile_ellipsis" avatarJsx={
                <BaseAvatar url="img/ellipsis.svg" name="..." width={36} height={36} />
            } name={text} presenceState="online" suppressOnHover={true}
            onClick={this._showFullRoomList} />
        );
    },

    _showFullRoomList: function() {
        this.setState({
            truncateAt: -1,
        });
    },

    onSearchQueryChanged: function(ev) {
        this.setState({ searchQuery: ev.target.value });
    },

    makeGroupRoomTiles: function(query) {
        const GroupRoomTile = sdk.getComponent("groups.GroupRoomTile");
        query = (query || "").toLowerCase();

        let roomList = this.state.rooms;
        if (query) {
            roomList = roomList.filter((room) => {
                const matchesName = (room.name || "").toLowerCase().includes(query);
                const matchesAlias = (room.canonicalAlias || "").toLowerCase().includes(query);
                return matchesName || matchesAlias;
            });
        }

        roomList = roomList.map((groupRoom, index) => {
            return (
                <GroupRoomTile
                    key={index}
                    groupId={this.props.groupId}
                    groupRoom={groupRoom} />
            );
        });

        return roomList;
    },

    render: function() {
        if (this.state.rooms === null) {
            return null;
        }

        const inputBox = (
            <form autoComplete="off">
                <input className="mx_GroupRoomList_query" id="mx_GroupRoomList_query" type="text"
                        onChange={this.onSearchQueryChanged} value={this.state.searchQuery}
                        placeholder={_t('Filter community rooms')} />
            </form>
        );

        const GeminiScrollbarWrapper = sdk.getComponent("elements.GeminiScrollbarWrapper");
        const TruncatedList = sdk.getComponent("elements.TruncatedList");
        return (
            <div className="mx_GroupRoomList">
                { inputBox }
                <GeminiScrollbarWrapper autoshow={true} className="mx_GroupRoomList_joined mx_GroupRoomList_outerWrapper">
                    <TruncatedList className="mx_GroupRoomList_wrapper" truncateAt={this.state.truncateAt}
                            createOverflowElement={this._createOverflowTile}>
                        { this.makeGroupRoomTiles(this.state.searchQuery) }
                    </TruncatedList>
                </GeminiScrollbarWrapper>
            </div>
        );
    },
});