/*
Copyright 2015, 2016 OpenMarket Ltd
Copyright 2019, 2020 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 Room from 'matrix-js-sdk/src/models/room';
import dis from '../../../dispatcher/dispatcher';
import CallHandler from '../../../CallHandler';
import {MatrixClientPeg} from '../../../MatrixClientPeg';
import { _t } from '../../../languageHandler';
import AccessibleButton from '../elements/AccessibleButton';
import VideoView from "./VideoView";
import RoomAvatar from "../avatars/RoomAvatar";
import PulsedAvatar from '../avatars/PulsedAvatar';

interface IProps {
        // js-sdk room object. If set, we will only show calls for the given
        // room; if not, we will show any active call.
        room?: Room,

        // A Conference Handler implementation
        // Must have a function signature:
        //  getConferenceCallForRoom(roomId: string): MatrixCall
        ConferenceHandler?: any,

        // maxHeight style attribute for the video panel
        maxVideoHeight?: number,

        // a callback which is called when the user clicks on the video div
        onClick?: React.MouseEventHandler,

        // a callback which is called when the content in the callview changes
        // in a way that is likely to cause a resize.
        onResize?: any,

        // classname applied to view,
        className?: string,

        // Whether to show the hang up icon:W
        showHangup?: boolean,

}

interface IState {
    call: any;
}

export default class CallView extends React.Component<IProps, IState> {
    private videoref: React.RefObject<any>;
    private dispatcherRef: string;

    constructor(props: IProps) {
        super(props);

        this.state = {
            // the call this view is displaying (if any)
            call: null,
        }

        this.videoref = createRef();
    }

    public componentDidMount() {
        this.dispatcherRef = dis.register(this.onAction);
        this.showCall();
    }

    public componentWillUnmount() {
        dis.unregister(this.dispatcherRef);
    }

    private onAction = (payload) => {
        // don't filter out payloads for room IDs other than props.room because
        // we may be interested in the conf 1:1 room
        if (payload.action !== 'call_state') {
            return;
        }
        this.showCall();
    }

    private showCall() {
        let call;

        if (this.props.room) {
            const roomId = this.props.room.roomId;
            call = CallHandler.getCallForRoom(roomId) ||
                (this.props.ConferenceHandler ?
                 this.props.ConferenceHandler.getConferenceCallForRoom(roomId) :
                 null
                );

            if (this.call) {
                this.setState({ call: call });
            }
        } else {
            call = CallHandler.getAnyActiveCall();
            // Ignore calls if we can't get the room associated with them.
            // I think the underlying problem is that the js-sdk sends events
            // for calls before it has made the rooms available in the store,
            // although this isn't confirmed.
            if (MatrixClientPeg.get().getRoom(call.roomId) === null) {
                call = null;
            }
            this.setState({ call: call });
        }

        if (call) {
            call.setLocalVideoElement(this.getVideoView().getLocalVideoElement());
            call.setRemoteVideoElement(this.getVideoView().getRemoteVideoElement());
            // always use a separate element for audio stream playback.
            // this is to let us move CallView around the DOM without interrupting remote audio
            // during playback, by having the audio rendered by a top-level <audio/> element.
            // rather than being rendered by the main remoteVideo <video/> element.
            call.setRemoteAudioElement(this.getVideoView().getRemoteAudioElement());
        }
        if (call && call.type === "video" && call.call_state !== "ended" && call.call_state !== "ringing") {
            // if this call is a conf call, don't display local video as the
            // conference will have us in it
            this.getVideoView().getLocalVideoElement().style.display = (
                call.confUserId ? "none" : "block"
            );
            this.getVideoView().getRemoteVideoElement().style.display = "block";
        } else {
            this.getVideoView().getLocalVideoElement().style.display = "none";
            this.getVideoView().getRemoteVideoElement().style.display = "none";
            dis.dispatch({action: 'video_fullscreen', fullscreen: false});
        }

        if (this.props.onResize) {
            this.props.onResize();
        }
    }

    private getVideoView() {
        return this.videoref.current;
    }

    public render() {
        let view: React.ReactNode;
        if (this.state.call && this.state.call.type === "voice") {
            const client = MatrixClientPeg.get()
            const callRoom = client.getRoom(this.state.call.roomId);

            view = <AccessibleButton className="mx_CallView2_voice" onClick={this.props.onClick}>
                <PulsedAvatar>
                    <RoomAvatar
                        room={callRoom}
                        height={35}
                        width={35}
                    />
                </PulsedAvatar>
                <div>
                    <h1>{callRoom.name}</h1>
                    <p>{ _t("Active call") }</p>
                </div>
            </AccessibleButton>;
        } else {
            view = <VideoView
                ref={this.videoref}
                onClick={this.props.onClick}
                onResize={this.props.onResize}
                maxHeight={this.props.maxVideoHeight}
            />;
        }

        let hangup: React.ReactNode;
        if (this.props.showHangup) {
            hangup = <div
                className="mx_CallView2_hangup"
                onClick={() => {
                    dis.dispatch({
                        action: 'hangup',
                        room_id: this.state.call.roomId,
                    });
                }}
            />
        }

        return <div className={this.props.className}>
            {view}
            {hangup}
        </div>;
    }
}