/*
Copyright 2015, 2016 OpenMarket Ltd
Copyright 2019 The Matrix.org Foundation C.I.C.

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, {createRef} from 'react';
import PropTypes from 'prop-types';
import classNames from 'classnames';
import { _t } from '../../../languageHandler';
import {MatrixClientPeg} from '../../../MatrixClientPeg';
import RateLimitedFunc from '../../../ratelimitedfunc';

import { linkifyElement } from '../../../HtmlUtils';
import {CancelButton} from './SimpleRoomHeader';
import SettingsStore from "../../../settings/SettingsStore";
import RoomHeaderButtons from '../right_panel/RoomHeaderButtons';
import E2EIcon from './E2EIcon';
import DecoratedRoomAvatar from "../avatars/DecoratedRoomAvatar";
import {DefaultTagID} from "../../../stores/room-list/models";
import AccessibleTooltipButton from "../elements/AccessibleTooltipButton";

export default class RoomHeader extends React.Component {
    static propTypes = {
        room: PropTypes.object,
        oobData: PropTypes.object,
        inRoom: PropTypes.bool,
        onSettingsClick: PropTypes.func,
        onPinnedClick: PropTypes.func,
        onSearchClick: PropTypes.func,
        onLeaveClick: PropTypes.func,
        onCancelClick: PropTypes.func,
        e2eStatus: PropTypes.string,
    };

    static defaultProps = {
        editing: false,
        inRoom: false,
        onCancelClick: null,
    };

    constructor(props) {
        super(props);

        this._topic = createRef();
    }

    componentDidMount() {
        const cli = MatrixClientPeg.get();
        cli.on("RoomState.events", this._onRoomStateEvents);
        cli.on("Room.accountData", this._onRoomAccountData);

        // When a room name occurs, RoomState.events is fired *before*
        // room.name is updated. So we have to listen to Room.name as well as
        // RoomState.events.
        if (this.props.room) {
            this.props.room.on("Room.name", this._onRoomNameChange);
        }
    }

    componentDidUpdate() {
        if (this._topic.current) {
            linkifyElement(this._topic.current);
        }
    }

    componentWillUnmount() {
        if (this.props.room) {
            this.props.room.removeListener("Room.name", this._onRoomNameChange);
        }
        const cli = MatrixClientPeg.get();
        if (cli) {
            cli.removeListener("RoomState.events", this._onRoomStateEvents);
            cli.removeListener("Room.accountData", this._onRoomAccountData);
        }
    }

    _onRoomStateEvents = (event, state) => {
        if (!this.props.room || event.getRoomId() !== this.props.room.roomId) {
            return;
        }

        // redisplay the room name, topic, etc.
        this._rateLimitedUpdate();
    };

    _onRoomAccountData = (event, room) => {
        if (!this.props.room || room.roomId !== this.props.room.roomId) return;
        if (event.getType() !== "im.vector.room.read_pins") return;

        this._rateLimitedUpdate();
    };

    _rateLimitedUpdate = new RateLimitedFunc(function() {
        /* eslint-disable babel/no-invalid-this */
        this.forceUpdate();
    }, 500);

    _onRoomNameChange = (room) => {
        this.forceUpdate();
    };

    _hasUnreadPins() {
        const currentPinEvent = this.props.room.currentState.getStateEvents("m.room.pinned_events", '');
        if (!currentPinEvent) return false;
        if (currentPinEvent.getContent().pinned && currentPinEvent.getContent().pinned.length <= 0) {
            return false; // no pins == nothing to read
        }

        const readPinsEvent = this.props.room.getAccountData("im.vector.room.read_pins");
        if (readPinsEvent && readPinsEvent.getContent()) {
            const readStateEvents = readPinsEvent.getContent().event_ids || [];
            if (readStateEvents) {
                return !readStateEvents.includes(currentPinEvent.getId());
            }
        }

        // There's pins, and we haven't read any of them
        return true;
    }

    _hasPins() {
        const currentPinEvent = this.props.room.currentState.getStateEvents("m.room.pinned_events", '');
        if (!currentPinEvent) return false;

        return !(currentPinEvent.getContent().pinned && currentPinEvent.getContent().pinned.length <= 0);
    }

    render() {
        let searchStatus = null;
        let cancelButton = null;
        let pinnedEventsButton = null;

        if (this.props.onCancelClick) {
            cancelButton = <CancelButton onClick={this.props.onCancelClick} />;
        }

        // don't display the search count until the search completes and
        // gives us a valid (possibly zero) searchCount.
        if (this.props.searchInfo &&
            this.props.searchInfo.searchCount !== undefined &&
            this.props.searchInfo.searchCount !== null) {
            searchStatus = <div className="mx_RoomHeader_searchStatus">&nbsp;
                { _t("(~%(count)s results)", { count: this.props.searchInfo.searchCount }) }
            </div>;
        }

        // XXX: this is a bit inefficient - we could just compare room.name for 'Empty room'...
        let settingsHint = false;
        const members = this.props.room ? this.props.room.getJoinedMembers() : undefined;
        if (members) {
            if (members.length === 1 && members[0].userId === MatrixClientPeg.get().credentials.userId) {
                const nameEvent = this.props.room.currentState.getStateEvents('m.room.name', '');
                if (!nameEvent || !nameEvent.getContent().name) {
                    settingsHint = true;
                }
            }
        }

        let roomName = _t("Join Room");
        if (this.props.oobData && this.props.oobData.name) {
            roomName = this.props.oobData.name;
        } else if (this.props.room) {
            roomName = this.props.room.name;
        }

        const textClasses = classNames('mx_RoomHeader_nametext', { mx_RoomHeader_settingsHint: settingsHint });
        const name =
            <div className="mx_RoomHeader_name" onClick={this.props.onSettingsClick}>
                <div dir="auto" className={textClasses} title={roomName}>{ roomName }</div>
                { searchStatus }
            </div>;

        let topic;
        if (this.props.room) {
            const ev = this.props.room.currentState.getStateEvents('m.room.topic', '');
            if (ev) {
                topic = ev.getContent().topic;
            }
        }
        const topicElement =
            <div className="mx_RoomHeader_topic" ref={this._topic} title={topic} dir="auto">{ topic }</div>;

        let roomAvatar;
        if (this.props.room) {
            roomAvatar = <DecoratedRoomAvatar
                room={this.props.room}
                avatarSize={32}
                tag={DefaultTagID.Untagged} // to apply room publicity badging
                oobData={this.props.oobData}
                viewAvatarOnClick={true}
            />;
        }

        if (this.props.onPinnedClick && SettingsStore.getValue('feature_pinning')) {
            let pinsIndicator = null;
            if (this._hasUnreadPins()) {
                pinsIndicator = (<div className="mx_RoomHeader_pinsIndicator mx_RoomHeader_pinsIndicatorUnread" />);
            } else if (this._hasPins()) {
                pinsIndicator = (<div className="mx_RoomHeader_pinsIndicator" />);
            }

            pinnedEventsButton =
                <AccessibleTooltipButton
                    className="mx_RoomHeader_button mx_RoomHeader_pinnedButton"
                    onClick={this.props.onPinnedClick}
                    title={_t("Pinned Messages")}
                >
                    { pinsIndicator }
                </AccessibleTooltipButton>;
        }

        let forgetButton;
        if (this.props.onForgetClick) {
            forgetButton =
                <AccessibleTooltipButton
                    className="mx_RoomHeader_button mx_RoomHeader_forgetButton"
                    onClick={this.props.onForgetClick}
                    title={_t("Forget room")} />;
        }

        let searchButton;
        if (this.props.onSearchClick && this.props.inRoom) {
            searchButton =
                <AccessibleTooltipButton
                    className="mx_RoomHeader_button mx_RoomHeader_searchButton"
                    onClick={this.props.onSearchClick}
                    title={_t("Search")} />;
        }

        const rightRow =
            <div className="mx_RoomHeader_buttons">
                { pinnedEventsButton }
                { forgetButton }
                { searchButton }
            </div>;

        const e2eIcon = this.props.e2eStatus ? <E2EIcon status={this.props.e2eStatus} /> : undefined;

        return (
            <div className="mx_RoomHeader light-panel">
                <div className="mx_RoomHeader_wrapper" aria-owns="mx_RightPanel">
                    <div className="mx_RoomHeader_avatar">{ roomAvatar }</div>
                    <div className="mx_RoomHeader_e2eIcon">{ e2eIcon }</div>
                    { name }
                    { topicElement }
                    { cancelButton }
                    { rightRow }
                    <RoomHeaderButtons />
                </div>
            </div>
        );
    }
}