import { isDevEnvironment, showBalloonWarning } from "../engine/debug/index.js";
import { RoomEvents } from "../engine/engine_networking.js";
import { disposeStream, NetworkedStreamEvents, NetworkedStreams, PeerHandle, StreamEndedEvent, StreamReceivedEvent } from "../engine/engine_networking_streams.js";
import { serializable } from "../engine/engine_serialization.js";
import { delay, getParam } from "../engine/engine_utils.js";
import { AudioSource } from "./AudioSource.js";
import { Behaviour, GameObject } from "./Component.js";
import type { IPointerClickHandler, PointerEventData } from "./ui/PointerEvents.js";
import { AspectMode, VideoPlayer } from "./VideoPlayer.js";

const debug = getParam("debugscreensharing");

/**
 * ScreenCapture component allows you to share your screen, camera or microphone with other users in the networked room.
 */
export enum ScreenCaptureDevice {
    /**
     * Capture the screen of the user.
     */
    Screen = 0,
    /**
     * Capture the camera of the user.
     */
    Camera = 1,
    /** Please note that canvas streaming might not work reliably on chrome: https://bugs.chromium.org/p/chromium/issues/detail?id=1156408 */
    Canvas = 2,
    /** When using Microphone only the voice will be send */
    Microphone = 3
}

/**
 * {@link ScreenCapture} allows you to share your screen, camera or microphone with other users in the networked room.
 */
declare type ScreenCaptureDeviceTypes = keyof typeof ScreenCaptureDevice;

/**
 * The current mode of the {@link ScreenCapture} component.
 */
export enum ScreenCaptureMode {
    Idle = 0,
    Sending = 1,
    Receiving = 2
}

/**
 * Options for the {@link ScreenCapture} component when starting to share a stream by calling the {@link ScreenCapture.share}.
 */
export declare type ScreenCaptureOptions = {
    /**
     * You can specify the device type to capture (e.g. Screen, Camera, Microphone)
     */
    device?: ScreenCaptureDeviceTypes,
    /**
     * Constraints for the media stream like resolution, frame rate, etc.
     * @see https://developer.mozilla.org/en-US/docs/Web/API/MediaStreamConstraints
     */
    constraints?: MediaTrackConstraints,
    /** Filter video device by id. Alternatively pass in a deviceFilter callback to manually filter available devices */
    deviceId?: string,
    /** Return false to skip the available device */
    deviceFilter?: (device: MediaDeviceInfo) => boolean,
}

/** 
 * The ScreenCapture component allows you to share your screen, camera or microphone with other users in the networked room.   
 * When the stream is active the video will be displayed on the VideoPlayer component attached to the same GameObject.  
 * 
 * Note: For debugging append `?debugscreensharing` to the URL to see more information in the console.
 * 
 * By default the component will start sharing the screen when the user clicks on the object this component is attached to. You can set {@link device} This behaviour can be disabled by setting `allowStartOnClick` to false.  
 * It is also possible to start the stream manually from your code by calling the {@link share} method.
 * 
 * @category Networking
 * @group Components
*/
export class ScreenCapture extends Behaviour implements IPointerClickHandler {

    /**
     * When enabled the stream will start when the user clicks on the object this component is attached to  
     * It is also possible to start the stream manually from your code by calling the {@link share} method    
     * To modify what type of device is shared you can set the {@link device} property.
     * @default true
     */
    @serializable()
    allowStartOnClick: boolean = true;

    /** @internal */
    onPointerEnter() {
        if (this.context.connection.allowEditing == false) return;
        if (!this.allowStartOnClick) return;
        this.context.input.setCursor("pointer");
    }
    /** @internal */
    onPointerExit() {
        if (this.context.connection.allowEditing == false) return;
        if (!this.allowStartOnClick) return;
        this.context.input.unsetCursor("pointer");
    }

    /** @internal */
    onPointerClick(evt: PointerEventData) {
        if (this.context.connection.allowEditing == false) return;
        if (!this.allowStartOnClick) return;
        if (evt && evt.pointerId !== 0) return;
        if (this.isReceiving && this.videoPlayer?.isPlaying) {
            if (this.videoPlayer)
                this.videoPlayer.screenspace = !this.videoPlayer.screenspace;
            return;

        }
        if (this.isSending) {
            this.close();
            return;
        }
        this.share();
    }


    /** When enabled the stream will start when this component becomes active (enabled in the scene) */
    @serializable()
    autoConnect: boolean = false;

    /**
     * If a VideoPlayer component is assigned to this property the video will be displayed on the VideoPlayer component.
     */
    @serializable(VideoPlayer)
    set videoPlayer(val: VideoPlayer | undefined) {
        if (this._videoPlayer && (this.isSending || this.isReceiving)) {
            this._videoPlayer.stop();
        }
        this._videoPlayer = val;
        if (this._videoPlayer && this._currentStream && (this.isSending || this.isReceiving)) {
            this._videoPlayer.setVideo(this._currentStream);
        }
    }
    get videoPlayer() { return this._videoPlayer; }
    private _videoPlayer?: VideoPlayer;
    private _audioSource?: AudioSource;

    /**
     * When enabled the video will be displayed in the screenspace of the VideoPlayer component.
     */
    get screenspace() { return this.videoPlayer?.screenspace ?? false; }
    set screenspace(v: boolean) { if (this.videoPlayer) this.videoPlayer.screenspace = v; }

    /**
     * Which streaming device type should be used when starting to share (if {@link share} is called without a device option). Options are Screen, Camera, Microphone.  
     * This is e.g. used if `allowStartOnClick` is enabled and the user clicks on the object. 
     * @default Screen 
     */
    @serializable()
    device: ScreenCaptureDeviceTypes = "Screen";

    /**
     * If assigned the device the device will be selected by this id or label when starting to share.  
     * Note: This is only supported for `Camera` devices
     */
    @serializable()
    deviceName?: string;

    /**
     * Filter which device should be chosen for sharing by id or label.  
     * Assign a method to this property to manually filter the available devices.  
     */
    deviceFilter?: (device: MediaDeviceInfo) => boolean;

    /**
     * the current stream that is being shared or received  
     * @link https://developer.mozilla.org/en-US/docs/Web/API/MediaStream
     */
    get currentScream(): MediaStream | null {
        return this._currentStream;
    }
    get currentMode(): ScreenCaptureMode {
        return this._currentMode;
    }

    /**
     * @returns true if the component is currently sending a stream
     */
    get isSending() {
        return this._currentStream?.active && this._currentMode === ScreenCaptureMode.Sending;
    }
    /**
     * @returns true if the component is currently receiving a stream
     */
    get isReceiving() {
        if (this._currentMode === ScreenCaptureMode.Receiving) {
            if (!this._currentStream || this._currentStream.active === false) return false;
            // if any track is still live consider it active
            const tracks = this._currentStream.getTracks();
            for (const track of tracks) {
                if (track.readyState === "live") return true;
            }
        }
        return false;
    }

    private get requiresVideoPlayer() { 
        return this.device !== "Microphone";
    }
    private _net?: NetworkedStreams;
    private _requestOpen: boolean = false;
    private _currentStream: MediaStream | null = null;
    private _currentMode: ScreenCaptureMode = ScreenCaptureMode.Idle;

    /** @internal */
    awake() {
        // Resolve the device type if it is a number
        if (typeof this.device === "number") {
            this.device = ScreenCaptureDevice[this.device] as ScreenCaptureDeviceTypes;
        }

        if (debug)
            console.log("Screensharing", this.name, this);
        AudioSource.registerWaitForAllowAudio(() => {
            if (this._videoPlayer && this._currentStream && this._currentMode === ScreenCaptureMode.Receiving) {
                this._videoPlayer.playInBackground = true;
                this._videoPlayer.setVideo(this._currentStream);
            }
        });
        this._net = new NetworkedStreams(this);
    }

    /** @internal */
    onEnable(): void {
        this._net?.enable();
        //@ts-ignore
        this._net?.addEventListener(NetworkedStreamEvents.StreamReceived, this.onReceiveStream);
        //@ts-ignore
        this._net?.addEventListener(NetworkedStreamEvents.StreamEnded, this.onCallEnded);
        this.context.connection.beginListen(RoomEvents.JoinedRoom, this.onJoinedRoom);
        if (this.autoConnect) {
            delay(1000).then(() => {
                if (this.enabled && this.autoConnect && !this.isReceiving && !this.isSending && this.context.connection.isInRoom)
                    this.share()
                return 0;
            });
        }
    }

    /** @internal */
    onDisable(): void {
        //@ts-ignore
        this._net?.removeEventListener(NetworkedStreamEvents.StreamReceived, this.onReceiveStream);
        //@ts-ignore
        this._net?.removeEventListener(NetworkedStreamEvents.StreamEnded, this.onCallEnded);
        this.context.connection.stopListen(RoomEvents.JoinedRoom, this.onJoinedRoom);
        this._net?.disable();
        this.close();
    }

    private onJoinedRoom = async () => {
        await delay(1000);
        if (this.autoConnect && !this.isSending && !this.isReceiving && this.context.connection.isInRoom) {
            this.share();
        }
    }

    private _ensureVideoPlayer() {
        const vp = new VideoPlayer();
        vp.aspectMode = AspectMode.AdjustWidth;
        GameObject.addComponent(this.gameObject, vp);
        this._videoPlayer = vp;
    }

    private _activeShareRequest: Promise<void> | null = null;

    /** Call to begin screensharing */
    async share(opts?: ScreenCaptureOptions) {
        if (this._activeShareRequest) return this._activeShareRequest;
        this._activeShareRequest = this.internalShare(opts);
        return this._activeShareRequest.then(() => {
            return this._activeShareRequest = null;
        })
    }

    private async internalShare(opts?: ScreenCaptureOptions) {
        if (this.context.connection.isInRoom === false) {
            console.warn("Can not start screensharing: requires network connection");
            if (isDevEnvironment()) showBalloonWarning("Can not start screensharing: requires network connection. Add a SyncedRoom component or join a room first.");
            return;
        }

        if (opts?.device)
            this.device = opts.device;

        if (!this.videoPlayer && this.requiresVideoPlayer) {
            if (!this._videoPlayer) {
                this._videoPlayer = GameObject.getComponent(this.gameObject, VideoPlayer) ?? undefined;
            }
            if (!this.videoPlayer) {
                this._ensureVideoPlayer();
            }
            if (!this.videoPlayer) {
                console.warn("Can not share video without a videoPlayer assigned");
                return;
            }
        }

        this._requestOpen = true;
        try {

            const settings: MediaTrackConstraints = opts?.constraints ?? {
                echoCancellation: true,
                autoGainControl: false,
            };
            const displayMediaOptions: MediaStreamConstraints = {
                video: settings,
                audio: settings,
            };
            const videoOptions = displayMediaOptions.video;
            if (videoOptions !== undefined && typeof videoOptions !== "boolean") {
                // Set default video settings
                if (!videoOptions.width)
                    videoOptions.width = { max: 1920 };
                if (!videoOptions.height)
                    videoOptions.height = { max: 1920 };
                if (!videoOptions.aspectRatio)
                    videoOptions.aspectRatio = { ideal: 1.7777777778 };
                if (!videoOptions.frameRate)
                    videoOptions.frameRate = { ideal: 24 };
                if (!videoOptions.facingMode)
                    videoOptions.facingMode = { ideal: "user" };
            }

            switch (this.device) {
                // Capture a connected camera
                case "Camera":
                    this.tryShareUserCamera(displayMediaOptions, opts);
                    break;

                // capture any screen, will show a popup
                case "Screen":
                    {
                        if (!navigator.mediaDevices.getDisplayMedia) {
                            console.error("No getDisplayMedia support");
                            return;
                        }
                        const myVideo = await navigator.mediaDevices.getDisplayMedia(displayMediaOptions);
                        if (this._requestOpen) {
                            this.setStream(myVideo, ScreenCaptureMode.Sending);
                        }
                        else disposeStream(myVideo);
                    }
                    break;

                // capture the canvas meaning the threejs view
                case "Canvas":
                    // looks like this doesnt work reliably on chrome https://stackoverflow.com/a/66848674
                    // firefox updates fine
                    // https://bugs.chromium.org/p/chromium/issues/detail?id=1156408
                    const fps = 0;
                    const stream = this.context.renderer.domElement.captureStream(fps);
                    this.setStream(stream, ScreenCaptureMode.Sending);
                    break;

                case "Microphone":
                    {
                        if (!navigator.mediaDevices.getUserMedia) {
                            console.error("No getDisplayMedia support");
                            return;
                        }
                        displayMediaOptions.video = false;
                        const myStream = await navigator.mediaDevices.getUserMedia(displayMediaOptions);
                        if (this._requestOpen) {
                            this.setStream(myStream, ScreenCaptureMode.Sending);
                        }
                        else disposeStream(myStream);
                    }
                    break

                default:
                    console.error("Can not start screen sharing: Unknown device type", this.device);

            }
        } catch (err: any) {
            if (err.name === "NotAllowedError") {
                // user cancelled stream selection
                console.log("Selection cancelled");
                this._requestOpen = false;
                return;
            }
            console.error("Error opening video", err);
        }
    }

    close() {
        this._requestOpen = false;
        if (this._currentStream) {
            if (debug)
                console.warn("Close current stream / disposing resources, stream was active?", this._currentStream.active);
            this._net?.stopSendingStream(this._currentStream);
            disposeStream(this._currentStream);
            this._currentMode = ScreenCaptureMode.Idle;
            this._currentStream = null;
        }
    }

    private setStream(stream: MediaStream, mode: ScreenCaptureMode) {

        if (stream === this._currentStream) return;

        this.close();
        if (!stream) return;

        this._currentStream = stream;
        this._requestOpen = true;
        this._currentMode = mode;

        const isVideoStream = this.device !== "Microphone";
        const isSending = mode === ScreenCaptureMode.Sending;

        if (isVideoStream) {
            if (!this._videoPlayer)
                this._ensureVideoPlayer();
            if (this._videoPlayer)
                this._videoPlayer.setVideo(stream);
            else console.error("No video player assigned for video stream");
        }
        else {
            if (!this._audioSource) {
                this._audioSource = new AudioSource();
                this._audioSource.spatialBlend = 0;
                this._audioSource.volume = 1;
                this.gameObject.addComponent(this._audioSource);
            }
            if (!isSending) {
                if (debug) console.log("PLAY", stream.getAudioTracks())
                this._audioSource.volume = 1;
                this._audioSource?.play(stream);
            }
        }

        if (isSending) {
            this._net?.startSendingStream(stream);
        }

        // Mute audio for the video we are sending
        if (isSending) {
            if (this._videoPlayer)
                this._videoPlayer.muted = true;
            this._audioSource?.stop();
        }

        for (const track of stream.getTracks()) {
            track.addEventListener("ended", () => {
                if (debug) console.log("Track ended", track);
                this.close();
            });

            if (debug) {
                if (track.kind === "video") {
                    if (isSending)
                        console.log("Video →", track.getSettings());
                    else
                        console.log("Video ←", track.getSettings());
                }
            }
        }

    }

    private onReceiveStream = (evt: StreamReceivedEvent) => {
        if (evt.stream?.active !== true) return;
        this.setStream(evt.stream, ScreenCaptureMode.Receiving);
    }
    private onCallEnded = (_evt: StreamEndedEvent) => {
        if (debug) console.log("CALL ENDED", this.isReceiving, this?.screenspace)
        if (this.isReceiving) this.screenspace = false;
    }



    private async tryShareUserCamera(constraints: MediaStreamConstraints, options?: ScreenCaptureOptions) {

        // let newWindow = open('', 'example', 'width=300,height=300');
        // if (window) {
        //     newWindow!.document.body.innerHTML = "Please allow access to your camera and microphone";
        // }

        // TODO: allow user to select device
        const devices = (await navigator.mediaDevices.enumerateDevices()).filter(d => d.kind === "videoinput");
        if (debug)
            console.log("Request camera. These are your kind:videoinput devices:\n", devices);

        let foundDevice = false;

        for (const dev of devices) {
            try {
                if (!this._requestOpen) {
                    if (debug) console.log("Camera selection cancelled");
                    break;
                }

                if (dev.kind !== "videoinput") {
                    if (debug) console.log("Skipping non-video device", dev);
                    continue;
                }

                const id = dev.deviceId;

                // If the share method is called with filter options then those should be used
                const hasOptionsFilter = options?.deviceId != undefined || options?.deviceFilter != undefined;
                if (hasOptionsFilter) {
                    if (options?.deviceId !== undefined) {
                        if (id !== options.deviceId) {
                            if (debug) console.log("Skipping device due to options.deviceId: " + dev.label + "; " + dev.deviceId);
                            continue;
                        }
                    }
                    if (options?.deviceFilter) {
                        const useDevice = options.deviceFilter(dev);
                        if (useDevice === false) {
                            if (debug) console.log("Skipping device due to options.deviceFilter: " + dev.label + "; " + dev.deviceId);
                            continue;
                        }
                    }
                }
                // If the share method was called without filter options then the component filter should be used
                else if (this.deviceFilter) {
                    const useDevice = this.deviceFilter(dev);
                    if (useDevice === false) {
                        if (debug) console.log("Skipping device due to ScreenShare.deviceFilter: " + dev.label + "; " + dev.deviceId);
                        continue;
                    }
                    else if(debug)
                        console.log("Selected device by filter", dev);
                }
                else if (this.deviceName) {
                    const lowercaseLabel = dev.label.toLowerCase();
                    const lowercaseName = this.deviceName.toLowerCase();
                    const labelMatches = lowercaseLabel.includes(lowercaseName);
                    const idMatches = dev.deviceId === this.deviceName;
                    if (!labelMatches && !idMatches) {
                        if (debug) console.log("Skipping device due to ScreenShare.deviceName: " + dev.label + "; " + dev.deviceId);
                        continue;
                    }
                    else if(debug) console.log("Selected device by name", dev);
                }

                if (constraints.video !== false) {
                    if (typeof constraints.video === "undefined" || typeof constraints.video === "boolean") {
                        constraints.video = {};
                    }
                    constraints.video.deviceId = id;
                }

                foundDevice = true;
                const userMedia = await navigator.mediaDevices.getUserMedia(constraints).catch(err => {
                    console.error("Failed to get user media", err);
                    return null;
                })
                if (userMedia === null) {
                    continue;
                }
                else if (this._requestOpen) {
                    this.setStream(userMedia, ScreenCaptureMode.Sending);
                    if (debug)
                        console.log("Selected camera", dev);
                }
                else {
                    disposeStream(userMedia);
                    if (debug)
                        console.log("Camera selection cancelled");
                }
                break;
            }
            catch (err: any) {
                // First message is firefox, second is chrome when the video source is already in use by another app
                if (err.message === "Failed to allocate videosource" || err.message === "Could not start video source") {
                    showBalloonWarning("Failed to start video: Try another camera (Code " + err.code + ")");
                    console.warn(err);
                    continue;
                }
                else {
                    console.error("Failed to get user media", err.message, err.code, err);
                }
            }
        }

        if(!foundDevice && isDevEnvironment()){
            showBalloonWarning("No camera found for sharing. Please connect a camera (see console for more information)");
            console.warn("No camera found for sharing. Please connect a camera", devices, this.deviceName, "Using deviceFilter? " + this.deviceFilter != undefined, "Using options? " + options != undefined, "Using deviceName? " + this.deviceName != undefined, "Using options.deviceId? " + options?.deviceId != undefined, "Using options.deviceFilter? " + options?.deviceFilter != undefined);
        }
    }
    // private _cameraSelectionWindow : Window | null = null;
    // private openWindowToSelectCamera(){

    // }
}