/*
Copyright 2024 New Vector Ltd.
Copyright 2021, 2022 Šimon Brandner <simon.bra.ag@gmail.com>
Copyright 2019-2021 The Matrix.org Foundation C.I.C.
Copyright 2015, 2016 OpenMarket Ltd

SPDX-License-Identifier: AGPL-3.0-only OR GPL-3.0-only OR LicenseRef-Element-Commercial
Please see LICENSE files in the repository root for full details.
*/

import React, { type JSX, createRef } from "react";
import { CallEvent, CallState, type MatrixCall } from "matrix-js-sdk/src/webrtc/call";
import classNames from "classnames";
import { type CallFeed } from "matrix-js-sdk/src/webrtc/callFeed";
import { SDPStreamMetadataPurpose } from "matrix-js-sdk/src/webrtc/callEventTypes";

import dis from "../../../dispatcher/dispatcher";
import { _t, _td } from "../../../languageHandler";
import VideoFeed from "./VideoFeed";
import RoomAvatar from "../avatars/RoomAvatar";
import AccessibleButton from "../elements/AccessibleButton";
import { avatarUrlForMember } from "../../../Avatar";
import LegacyCallViewSidebar from "./LegacyCallViewSidebar";
import LegacyCallViewHeader from "./LegacyCallView/LegacyCallViewHeader";
import LegacyCallViewButtons from "./LegacyCallView/LegacyCallViewButtons";
import { type ActionPayload } from "../../../dispatcher/payloads";
import { getKeyBindingsManager } from "../../../KeyBindingsManager";
import { KeyBindingAction } from "../../../accessibility/KeyboardShortcuts";
import { SDKContext } from "../../../contexts/SDKContext.ts";

interface IProps {
    // The call for us to display
    call: MatrixCall;

    // Another ongoing call to display information about
    secondaryCall?: MatrixCall;

    // a callback which is called when the content in the LegacyCallView changes
    // in a way that is likely to cause a resize.
    onResize?: (event: Event) => void;

    // Whether this call view is for picture-in-picture mode
    // otherwise, it's the larger call view when viewing the room the call is in.
    // This is sort of a proxy for a number of things but we currently have no
    // need to control those things separately, so this is simpler.
    pipMode?: boolean;

    // Used for dragging the PiP LegacyCallView
    onMouseDownOnHeader?: (event: React.MouseEvent<Element, MouseEvent>) => void;

    showApps?: boolean;

    sidebarShown: boolean;

    setSidebarShown?: (sidebarShown: boolean) => void;
}

interface IState {
    isLocalOnHold: boolean;
    isRemoteOnHold: boolean;
    micMuted: boolean;
    vidMuted: boolean;
    screensharing: boolean;
    callState: CallState;
    primaryFeed?: CallFeed;
    secondaryFeed?: CallFeed;
    sidebarFeeds: Array<CallFeed>;
}

function getFullScreenElement(): Element | null {
    return document.fullscreenElement;
}

function requestFullscreen(element: Element): void {
    element.requestFullscreen();
}

function exitFullscreen(): void {
    document.exitFullscreen();
}

export default class LegacyCallView extends React.Component<IProps, IState> {
    public static contextType = SDKContext;
    declare public context: React.ContextType<typeof SDKContext>;

    private dispatcherRef?: string;
    private contentWrapperRef = createRef<HTMLDivElement>();
    private buttonsRef = createRef<LegacyCallViewButtons>();

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

        const { primary, secondary, sidebar } = LegacyCallView.getOrderedFeeds(this.props.call.getFeeds());

        this.state = {
            isLocalOnHold: this.props.call.isLocalOnHold(),
            isRemoteOnHold: this.props.call.isRemoteOnHold(),
            micMuted: this.props.call.isMicrophoneMuted(),
            vidMuted: this.props.call.isLocalVideoMuted(),
            screensharing: this.props.call.isScreensharing(),
            callState: this.props.call.state,
            primaryFeed: primary,
            secondaryFeed: secondary,
            sidebarFeeds: sidebar,
        };
    }

    public componentDidMount(): void {
        this.updateCallListeners(null, this.props.call);
        this.dispatcherRef = dis.register(this.onAction);
        document.addEventListener("keydown", this.onNativeKeyDown);
    }

    public componentWillUnmount(): void {
        if (getFullScreenElement()) {
            exitFullscreen();
        }

        document.removeEventListener("keydown", this.onNativeKeyDown);
        this.updateCallListeners(this.props.call, null);
        dis.unregister(this.dispatcherRef);
    }

    public static getDerivedStateFromProps(props: IProps): Partial<IState> {
        const { primary, secondary, sidebar } = LegacyCallView.getOrderedFeeds(props.call.getFeeds());

        return {
            primaryFeed: primary,
            secondaryFeed: secondary,
            sidebarFeeds: sidebar,
        };
    }

    public componentDidUpdate(prevProps: IProps): void {
        if (this.props.call === prevProps.call) return;

        this.setState({
            isLocalOnHold: this.props.call.isLocalOnHold(),
            isRemoteOnHold: this.props.call.isRemoteOnHold(),
            micMuted: this.props.call.isMicrophoneMuted(),
            vidMuted: this.props.call.isLocalVideoMuted(),
            callState: this.props.call.state,
        });

        this.updateCallListeners(null, this.props.call);
    }

    private onAction = (payload: ActionPayload): void => {
        switch (payload.action) {
            case "video_fullscreen": {
                if (!this.contentWrapperRef.current) {
                    return;
                }
                if (payload.fullscreen) {
                    requestFullscreen(this.contentWrapperRef.current);
                } else if (getFullScreenElement()) {
                    exitFullscreen();
                }
                break;
            }
        }
    };

    private updateCallListeners(oldCall: MatrixCall | null, newCall: MatrixCall | null): void {
        if (oldCall === newCall) return;

        if (oldCall) {
            oldCall.removeListener(CallEvent.State, this.onCallState);
            oldCall.removeListener(CallEvent.LocalHoldUnhold, this.onCallLocalHoldUnhold);
            oldCall.removeListener(CallEvent.RemoteHoldUnhold, this.onCallRemoteHoldUnhold);
            oldCall.removeListener(CallEvent.FeedsChanged, this.onFeedsChanged);
        }
        if (newCall) {
            newCall.on(CallEvent.State, this.onCallState);
            newCall.on(CallEvent.LocalHoldUnhold, this.onCallLocalHoldUnhold);
            newCall.on(CallEvent.RemoteHoldUnhold, this.onCallRemoteHoldUnhold);
            newCall.on(CallEvent.FeedsChanged, this.onFeedsChanged);
        }
    }

    private onCallState = (state: CallState): void => {
        this.setState({
            callState: state,
        });
    };

    private onFeedsChanged = (newFeeds: Array<CallFeed>): void => {
        const { primary, secondary, sidebar } = LegacyCallView.getOrderedFeeds(newFeeds);
        this.setState({
            primaryFeed: primary,
            secondaryFeed: secondary,
            sidebarFeeds: sidebar,
            micMuted: this.props.call.isMicrophoneMuted(),
            vidMuted: this.props.call.isLocalVideoMuted(),
        });
    };

    private onCallLocalHoldUnhold = (): void => {
        this.setState({
            isLocalOnHold: this.props.call.isLocalOnHold(),
        });
    };

    private onCallRemoteHoldUnhold = (): void => {
        this.setState({
            isRemoteOnHold: this.props.call.isRemoteOnHold(),
            // update both here because isLocalOnHold changes when we hold the call too
            isLocalOnHold: this.props.call.isLocalOnHold(),
        });
    };

    private onMouseMove = (): void => {
        this.buttonsRef.current?.showControls();
    };

    public static getOrderedFeeds(feeds: Array<CallFeed>): {
        primary?: CallFeed;
        secondary?: CallFeed;
        sidebar: Array<CallFeed>;
    } {
        if (feeds.length <= 2) {
            return {
                primary: feeds.find((feed) => !feed.isLocal()),
                secondary: feeds.find((feed) => feed.isLocal()),
                sidebar: [],
            };
        }

        let primary: CallFeed | undefined;

        // Try to use a screensharing as primary, a remote one if possible
        const screensharingFeeds = feeds.filter((feed) => feed.purpose === SDPStreamMetadataPurpose.Screenshare);
        primary = screensharingFeeds.find((feed) => !feed.isLocal()) || screensharingFeeds[0];
        // If we didn't find remote screen-sharing stream, try to find any remote stream
        if (!primary) {
            primary = feeds.find((feed) => !feed.isLocal());
        }

        const sidebar = [...feeds];
        // Remove the primary feed from the array
        if (primary) sidebar.splice(sidebar.indexOf(primary), 1);
        sidebar.sort((a, b) => {
            if (a.isLocal() && !b.isLocal()) return -1;
            if (!a.isLocal() && b.isLocal()) return 1;
            return 0;
        });

        return { primary, sidebar };
    }

    private onMaximizeClick = (): void => {
        dis.dispatch({
            action: "video_fullscreen",
            fullscreen: true,
        });
    };

    private onMicMuteClick = async (): Promise<void> => {
        const newVal = !this.state.micMuted;
        this.setState({ micMuted: await this.props.call.setMicrophoneMuted(newVal) });
    };

    private onVidMuteClick = async (): Promise<void> => {
        const newVal = !this.state.vidMuted;
        this.setState({ vidMuted: await this.props.call.setLocalVideoMuted(newVal) });
    };

    private onScreenshareClick = async (): Promise<void> => {
        let isScreensharing;
        if (this.state.screensharing) {
            isScreensharing = await this.props.call.setScreensharingEnabled(false);
        } else {
            isScreensharing = await this.props.call.setScreensharingEnabled(true);
        }

        this.props.setSidebarShown?.(true);

        this.setState({
            screensharing: isScreensharing,
        });
    };

    // we register global shortcuts here, they *must not conflict* with local shortcuts elsewhere or both will fire
    // Note that this assumes we always have a LegacyCallView on screen at any given time
    // LegacyCallHandler would probably be a better place for this
    private onNativeKeyDown = (ev: KeyboardEvent): void => {
        let handled = false;

        const callAction = getKeyBindingsManager().getCallAction(ev);
        switch (callAction) {
            case KeyBindingAction.ToggleMicInCall:
                this.onMicMuteClick();
                // show the controls to give feedback
                this.buttonsRef.current?.showControls();
                handled = true;
                break;

            case KeyBindingAction.ToggleWebcamInCall:
                this.onVidMuteClick();
                // show the controls to give feedback
                this.buttonsRef.current?.showControls();
                handled = true;
                break;
        }

        if (handled) {
            ev.stopPropagation();
            ev.preventDefault();
        }
    };

    private onCallResumeClick = (): void => {
        const userFacingRoomId = this.context.legacyCallHandler.roomIdForCall(this.props.call);
        if (userFacingRoomId) this.context.legacyCallHandler.setActiveCallRoomId(userFacingRoomId);
    };

    private onTransferClick = (): void => {
        const transfereeCall = this.context.legacyCallHandler.getTransfereeForCallId(this.props.call.callId);
        if (transfereeCall) this.props.call.transferToCall(transfereeCall);
    };

    private onHangupClick = (): void => {
        const roomId = this.context.legacyCallHandler.roomIdForCall(this.props.call);
        if (roomId) this.context.legacyCallHandler.hangupOrReject(roomId);
    };

    private onToggleSidebar = (): void => {
        this.props.setSidebarShown?.(!this.props.sidebarShown);
    };

    private renderCallControls(): JSX.Element {
        const { call, pipMode, sidebarShown } = this.props;
        const { callState, micMuted, vidMuted, screensharing, secondaryFeed, sidebarFeeds } = this.state;

        // If SDPStreamMetadata isn't supported don't show video mute button in voice calls
        const vidMuteButtonShown = call.opponentSupportsSDPStreamMetadata() || call.hasLocalUserMediaVideoTrack;
        // Screensharing is possible, if we can send a second stream and
        // identify it using SDPStreamMetadata or if we can replace the already
        // existing usermedia track by a screensharing track. We also need to be
        // connected to know the state of the other side
        const screensharingButtonShown =
            (call.opponentSupportsSDPStreamMetadata() || call.hasLocalUserMediaVideoTrack) &&
            call.state === CallState.Connected;
        // Show the sidebar button only if there is something to hide/show
        const sidebarButtonShown =
            !pipMode && ((secondaryFeed && !secondaryFeed.isVideoMuted()) || sidebarFeeds.length > 0);
        // The dial pad & 'more' button actions are only relevant in a connected call
        const contextMenuButtonShown = callState === CallState.Connected;
        const dialpadButtonShown = callState === CallState.Connected && call.opponentSupportsDTMF();

        return (
            <LegacyCallViewButtons
                ref={this.buttonsRef}
                call={call}
                pipMode={pipMode}
                handlers={{
                    onToggleSidebarClick: this.onToggleSidebar,
                    onScreenshareClick: this.onScreenshareClick,
                    onHangupClick: this.onHangupClick,
                    onMicMuteClick: this.onMicMuteClick,
                    onVidMuteClick: this.onVidMuteClick,
                }}
                buttonsState={{
                    micMuted: micMuted,
                    vidMuted: vidMuted,
                    sidebarShown: sidebarShown,
                    screensharing: screensharing,
                }}
                buttonsVisibility={{
                    vidMute: vidMuteButtonShown,
                    screensharing: screensharingButtonShown,
                    sidebar: sidebarButtonShown,
                    contextMenu: contextMenuButtonShown,
                    dialpad: dialpadButtonShown,
                }}
            />
        );
    }

    private renderToast(): JSX.Element | null {
        const { call, sidebarShown } = this.props;
        const someoneIsScreensharing = call.getFeeds().some((feed) => {
            return feed.purpose === SDPStreamMetadataPurpose.Screenshare;
        });

        if (!someoneIsScreensharing) return null;

        const isScreensharing = call.isScreensharing();
        const { primaryFeed } = this.state;
        const sharerName = primaryFeed?.getMember()?.name;
        if (!sharerName) return null;

        let text = isScreensharing ? _t("voip|you_are_presenting") : _t("voip|user_is_presenting", { sharerName });
        if (!sidebarShown) {
            text += " • " + (call.isLocalVideoMuted() ? _t("voip|camera_disabled") : _t("voip|camera_enabled"));
        }

        return <div className="mx_LegacyCallView_toast">{text}</div>;
    }

    private renderContent(): JSX.Element {
        const { pipMode, call, onResize, sidebarShown } = this.props;
        const { isLocalOnHold, isRemoteOnHold, primaryFeed, secondaryFeed, sidebarFeeds } = this.state;

        const callRoomId = this.context.legacyCallHandler.roomIdForCall(call);
        const callRoom = (callRoomId ? this.context.client?.getRoom(callRoomId) : undefined) ?? undefined;
        const avatarSize = pipMode ? "76px" : "160px";
        const transfereeCall = this.context.legacyCallHandler.getTransfereeForCallId(call.callId);
        const isOnHold = isLocalOnHold || isRemoteOnHold;

        let secondaryFeedElement: React.ReactNode;
        if (sidebarShown && secondaryFeed && !secondaryFeed.isVideoMuted()) {
            secondaryFeedElement = (
                <VideoFeed feed={secondaryFeed} call={call} pipMode={pipMode} onResize={onResize} secondary={true} />
            );
        }

        if (transfereeCall || isOnHold) {
            const containerClasses = classNames("mx_LegacyCallView_content", {
                mx_LegacyCallView_content_hold: isOnHold,
            });
            const backgroundAvatarUrl = avatarUrlForMember(call.getOpponentMember(), 1024, 1024, "crop");

            let holdTransferContent: React.ReactNode;
            if (transfereeCall) {
                const callRoomId = this.context.legacyCallHandler.roomIdForCall(call);
                const transferTargetRoom = callRoomId ? this.context.client?.getRoom(callRoomId) : null;
                const transferTargetName = transferTargetRoom ? transferTargetRoom.name : _t("voip|unknown_person");
                const transfereeCallRoomId = this.context.legacyCallHandler.roomIdForCall(transfereeCall);
                const transfereeRoom = transfereeCallRoomId ? this.context.client?.getRoom(transfereeCallRoomId) : null;
                const transfereeName = transfereeRoom ? transfereeRoom.name : _t("voip|unknown_person");

                holdTransferContent = (
                    <div className="mx_LegacyCallView_status">
                        {_t(
                            "voip|consulting",
                            {
                                transferTarget: transferTargetName,
                                transferee: transfereeName,
                            },
                            {
                                a: (sub) => (
                                    <AccessibleButton kind="link_inline" onClick={this.onTransferClick}>
                                        {sub}
                                    </AccessibleButton>
                                ),
                            },
                        )}
                    </div>
                );
            } else {
                let onHoldText: React.ReactNode;
                if (isRemoteOnHold) {
                    onHoldText = _t(
                        this.context.legacyCallHandler.hasAnyUnheldCall()
                            ? _td("voip|call_held_switch")
                            : _td("voip|call_held_resume"),
                        {},
                        {
                            a: (sub) => (
                                <AccessibleButton kind="link_inline" onClick={this.onCallResumeClick}>
                                    {sub}
                                </AccessibleButton>
                            ),
                        },
                    );
                } else if (isLocalOnHold) {
                    onHoldText = _t("voip|call_held", {
                        peerName: call.getOpponentMember()?.name,
                    });
                }

                holdTransferContent = <div className="mx_LegacyCallView_status">{onHoldText}</div>;
            }

            return (
                <div className={containerClasses} onMouseMove={this.onMouseMove}>
                    <div
                        className="mx_LegacyCallView_holdBackground"
                        style={{ backgroundImage: "url(" + backgroundAvatarUrl + ")" }}
                    />
                    {holdTransferContent}
                </div>
            );
        } else if (call.noIncomingFeeds()) {
            return (
                <div className="mx_LegacyCallView_content" onMouseMove={this.onMouseMove}>
                    <div className="mx_LegacyCallView_avatarsContainer">
                        <div
                            className="mx_LegacyCallView_avatarContainer"
                            style={{ width: avatarSize, height: avatarSize }}
                        >
                            <RoomAvatar room={callRoom} size={avatarSize} />
                        </div>
                    </div>
                    <div className="mx_LegacyCallView_status">{_t("voip|connecting")}</div>
                    {secondaryFeedElement}
                </div>
            );
        } else if (pipMode) {
            // We've already checked that we have feeds so we cast away the optional when passing the feed
            return (
                <div className="mx_LegacyCallView_content" onMouseMove={this.onMouseMove}>
                    <VideoFeed
                        feed={primaryFeed as CallFeed}
                        call={call}
                        pipMode={pipMode}
                        onResize={onResize}
                        primary={true}
                    />
                </div>
            );
        } else if (secondaryFeed) {
            return (
                <div className="mx_LegacyCallView_content" onMouseMove={this.onMouseMove}>
                    <VideoFeed
                        feed={primaryFeed as CallFeed}
                        call={call}
                        pipMode={pipMode}
                        onResize={onResize}
                        primary={true}
                    />
                    {secondaryFeedElement}
                </div>
            );
        } else {
            return (
                <div className="mx_LegacyCallView_content" onMouseMove={this.onMouseMove}>
                    <VideoFeed
                        feed={primaryFeed as CallFeed}
                        call={call}
                        pipMode={pipMode}
                        onResize={onResize}
                        primary={true}
                    />
                    {sidebarShown && (
                        <LegacyCallViewSidebar feeds={sidebarFeeds} call={call} pipMode={Boolean(pipMode)} />
                    )}
                </div>
            );
        }
    }

    public render(): React.ReactNode {
        const { call, secondaryCall, pipMode, showApps, onMouseDownOnHeader, sidebarShown } = this.props;
        const { sidebarFeeds } = this.state;

        const callRoomId = this.context.legacyCallHandler.roomIdForCall(call);
        const secondaryCallRoomId = this.context.legacyCallHandler.roomIdForCall(secondaryCall);
        const callRoom = callRoomId ? this.context.client?.getRoom(callRoomId) : null;
        if (!callRoom) return null;

        const secCallRoom = secondaryCallRoomId ? this.context.client?.getRoom(secondaryCallRoomId) : null;

        const callViewClasses = classNames({
            mx_LegacyCallView: true,
            mx_LegacyCallView_pip: pipMode,
            mx_LegacyCallView_large: !pipMode,
            mx_LegacyCallView_sidebar: sidebarShown && sidebarFeeds.length !== 0 && !pipMode,
            mx_LegacyCallView_belowWidget: showApps, // css to correct the margins if the call is below the AppsDrawer.
        });

        return (
            <div className={callViewClasses}>
                <LegacyCallViewHeader
                    onPipMouseDown={onMouseDownOnHeader}
                    pipMode={pipMode}
                    callRooms={[callRoom, secCallRoom ?? null]}
                    onMaximize={this.onMaximizeClick}
                />
                <div className="mx_LegacyCallView_content_wrapper" ref={this.contentWrapperRef}>
                    {this.renderToast()}
                    {this.renderContent()}
                    {this.renderCallControls()}
                </div>
            </div>
        );
    }
}
