import { ViewerConfiguration, IModelConfiguration, ILightConfiguration } from './../configuration/configuration';
import { Template, EventCallback } from './../templateManager';
import { AbstractViewer } from './viewer';
import { SpotLight, MirrorTexture, Plane, ShadowGenerator, Texture, BackgroundMaterial, Observable, ShadowLight, CubeTexture, BouncingBehavior, FramingBehavior, Behavior, Light, Engine, Scene, AutoRotationBehavior, AbstractMesh, Quaternion, StandardMaterial, ArcRotateCamera, ImageProcessingConfiguration, Color3, Vector3, SceneLoader, Mesh, HemisphericLight } from 'babylonjs';
import { CameraBehavior } from '../interfaces';

export class DefaultViewer extends AbstractViewer {

    constructor(public containerElement: HTMLElement, initialConfiguration: ViewerConfiguration = { extends: 'default' }) {
        super(containerElement, initialConfiguration);
        this.onModelLoadedObservable.add(this.onModelLoaded);
    }

    public initScene(): Promise<Scene> {
        return super.initScene().then(() => {
            this.extendClassWithConfig(this.scene, this.configuration.scene);
            return this.scene;
        })
    }

    protected onTemplatesLoaded() {

        this.showLoadingScreen();

        // navbar
        this.initNavbar();

        // close overlay button
        let closeButton = document.getElementById('close-button');
        if (closeButton) {
            closeButton.addEventListener('pointerdown', () => {
                this.hideOverlayScreen();
            })
        }

        return super.onTemplatesLoaded();
    }

    private initNavbar() {
        let navbar = this.templateManager.getTemplate('navBar');
        if (navbar) {
            let navbarHeight = navbar.parent.clientHeight + 'px';

            let navbarShown: boolean = true;
            let timeoutCancel /*: number*/;

            let triggerNavbar = function (show: boolean = false, evt: PointerEvent) {
                // only left-click on no-button.
                if (!navbar || evt.button > 0) return;
                // clear timeout
                timeoutCancel && clearTimeout(timeoutCancel);
                // if state is the same, do nothing
                if (show === navbarShown) return;
                //showing? simply show it!
                if (show) {
                    navbar.parent.style.bottom = show ? '0px' : '-' + navbarHeight;
                    navbarShown = show;
                } else {
                    let visibilityTimeout = 2000;
                    if (navbar.configuration.params && navbar.configuration.params.visibilityTimeout !== undefined) {
                        visibilityTimeout = <number>navbar.configuration.params.visibilityTimeout;
                    }
                    // not showing? set timeout until it is removed.
                    timeoutCancel = setTimeout(function () {
                        if (navbar) {
                            navbar.parent.style.bottom = '-' + navbarHeight;
                        }
                        navbarShown = show;
                    }, visibilityTimeout);
                }
            }

            this.templateManager.eventManager.registerCallback('viewer', triggerNavbar.bind(this, false), 'pointerout');
            this.templateManager.eventManager.registerCallback('viewer', triggerNavbar.bind(this, true), 'pointerdown');
            this.templateManager.eventManager.registerCallback('viewer', triggerNavbar.bind(this, false), 'pointerup');
            this.templateManager.eventManager.registerCallback('navBar', triggerNavbar.bind(this, true), 'pointerover');

            // other events
            let viewerTemplate = this.templateManager.getTemplate('viewer');
            let viewerElement = viewerTemplate && viewerTemplate.parent;
            // full screen
            let triggerFullscren = (eventData: EventCallback) => {
                if (viewerElement) {
                    let fullscreenElement = document.fullscreenElement || document.webkitFullscreenElement || (<any>document).mozFullScreenElement || (<any>document).msFullscreenElement;
                    if (!fullscreenElement) {
                        let requestFullScreen = viewerElement.requestFullscreen || viewerElement.webkitRequestFullscreen || (<any>viewerElement).msRequestFullscreen || (<any>viewerElement).mozRequestFullScreen;
                        requestFullScreen.call(viewerElement);
                    } else {
                        let exitFullscreen = document.exitFullscreen || document.webkitExitFullscreen || (<any>document).msExitFullscreen || (<any>document).mozCancelFullScreen
                        exitFullscreen.call(document);
                    }
                }
            }

            this.templateManager.eventManager.registerCallback('navBar', triggerFullscren, 'pointerdown', '#fullscreen-button');
        }
    }

    protected prepareContainerElement() {
        this.containerElement.style.position = 'relative';
        this.containerElement.style.display = 'flex';
    }

    protected configureModel(modelConfiguration: Partial<IModelConfiguration>) {
        super.configureModel(modelConfiguration);

        let navbar = this.templateManager.getTemplate('navBar');
        if (!navbar) return;

        let metadataContainer = navbar.parent.querySelector('#model-metadata');
        if (metadataContainer) {
            if (modelConfiguration.title !== undefined) {
                let element = metadataContainer.querySelector('span.model-title');
                if (element) {
                    element.innerHTML = modelConfiguration.title;
                }
            }

            if (modelConfiguration.subtitle !== undefined) {
                let element = metadataContainer.querySelector('span.model-subtitle');
                if (element) {
                    element.innerHTML = modelConfiguration.subtitle;
                }
            }

            if (modelConfiguration.thumbnail !== undefined) {
                (<HTMLDivElement>metadataContainer.querySelector('.thumbnail')).style.backgroundImage = `url('${modelConfiguration.thumbnail}')`;
            }
        }
    }

    public loadModel(model: any = this.configuration.model): Promise<Scene> {
        this.showLoadingScreen();
        return super.loadModel(model, true).catch((error) => {
            console.log(error);
            this.hideLoadingScreen();
            this.showOverlayScreen('error');
            return this.scene;
        });
    }

    private onModelLoaded = (meshes: Array<AbstractMesh>) => {
        // with a short timeout, making sure everything is there already.
        let hideLoadingDelay = 500;
        if (this.configuration.lab && this.configuration.lab.hideLoadingDelay !== undefined) {
            hideLoadingDelay = this.configuration.lab.hideLoadingDelay;
        }
        setTimeout(() => {
            this.hideLoadingScreen();
        }, hideLoadingDelay);

        meshes[0].rotation.y += Math.PI;

        return; //this.initEnvironment(meshes);
    }

    /*protected initEnvironment(focusMeshes: Array<AbstractMesh> = []): Promise<Scene> {
        if (this.configuration.skybox) {
            // Define a general environment textue
            let texture;
            // this is obligatory, but still - making sure it is there.
            if (this.configuration.skybox.cubeTexture) {
                if (typeof this.configuration.skybox.cubeTexture.url === 'string') {
                    texture = CubeTexture.CreateFromPrefilteredData(this.configuration.skybox.cubeTexture.url, this.scene);
                } else {
                    texture = CubeTexture.CreateFromImages(this.configuration.skybox.cubeTexture.url, this.scene, this.configuration.skybox.cubeTexture.noMipMap);
                }
            }
            if (texture) {
                this.extendClassWithConfig(texture, this.configuration.skybox.cubeTexture);

                let scale = this.configuration.skybox.scale || this.scene.activeCamera && (this.scene.activeCamera.maxZ - this.scene.activeCamera.minZ) / 2 || 1;

                let box = this.scene.createDefaultSkybox(texture, this.configuration.skybox.pbr, scale, this.configuration.skybox.blur);

                // before extending, set the material's imageprocessing configuration object, if needed:
                if (this.configuration.skybox.material && this.configuration.skybox.material.imageProcessingConfiguration && box) {
                    (<StandardMaterial>box.material).imageProcessingConfiguration = new ImageProcessingConfiguration();
                }

                this.extendClassWithConfig(box, this.configuration.skybox);

                box && focusMeshes.push(box);
            }
        }

        if (this.configuration.ground) {
            let groundConfig = (typeof this.configuration.ground === 'boolean') ? {} : this.configuration.ground;

            let groundSize = groundConfig.size || (this.configuration.skybox && this.configuration.skybox.scale) || 3000;

            let ground = Mesh.CreatePlane("BackgroundPlane", groundSize, this.scene);
            let backgroundMaterial = new BackgroundMaterial('groundmat', this.scene);
            ground.rotation.x = Math.PI / 2; // Face up by default.
            ground.receiveShadows = groundConfig.receiveShadows || false;

            // position the ground correctly
            let groundPosition = focusMeshes[0].getHierarchyBoundingVectors().min.y;
            ground.position.y = groundPosition;

            // default values
            backgroundMaterial.alpha = 0.9;
            backgroundMaterial.alphaMode = Engine.ALPHA_PREMULTIPLIED_PORTERDUFF;
            backgroundMaterial.shadowLevel = 0.5;
            backgroundMaterial.primaryLevel = 1;
            backgroundMaterial.primaryColor = new Color3(0.2, 0.2, 0.3).toLinearSpace().scale(3);
            backgroundMaterial.secondaryLevel = 0;
            backgroundMaterial.tertiaryLevel = 0;
            backgroundMaterial.useRGBColor = false;
            backgroundMaterial.enableNoise = true;

            // if config provided, extend the default values
            if (groundConfig.material) {
                this.extendClassWithConfig(ground, ground.material);
            }

            ground.material = backgroundMaterial;
            if (this.configuration.ground === true || groundConfig.shadowOnly) {
                // shadow only:
                ground.receiveShadows = true;
                const diffuseTexture = new Texture("https://assets.babylonjs.com/environments/backgroundGround.png", this.scene);
                diffuseTexture.gammaSpace = false;
                diffuseTexture.hasAlpha = true;
                backgroundMaterial.diffuseTexture = diffuseTexture;
            } else if (groundConfig.mirror) {
                var mirror = new MirrorTexture("mirror", 512, this.scene);
                mirror.mirrorPlane = new Plane(0, -1, 0, 0);
                mirror.renderList = mirror.renderList || [];
                focusMeshes.length && focusMeshes.forEach(m => {
                    m && mirror.renderList && mirror.renderList.push(m);
                });

                backgroundMaterial.reflectionTexture = mirror;
            } else {
                if (groundConfig.material) {
                    if (groundConfig.material.diffuseTexture) {
                        const diffuseTexture = new Texture(groundConfig.material.diffuseTexture, this.scene);
                        backgroundMaterial.diffuseTexture = diffuseTexture;
                    }
                }
                // ground.material = new StandardMaterial('groundmat', this.scene);
            }
            //default configuration
            if (this.configuration.ground === true) {
                ground.receiveShadows = true;
                if (ground.material)
                    ground.material.alpha = 0.4;
            }




            this.extendClassWithConfig(ground, groundConfig);
        }

        return Promise.resolve(this.scene);
    }*/

    public showOverlayScreen(subScreen: string) {
        let template = this.templateManager.getTemplate('overlay');
        if (!template) return Promise.reject('Overlay template not found');

        return template.show((template => {

            var canvasRect = this.containerElement.getBoundingClientRect();
            var canvasPositioning = window.getComputedStyle(this.containerElement).position;

            template.parent.style.display = 'flex';
            template.parent.style.width = canvasRect.width + "px";
            template.parent.style.height = canvasRect.height + "px";
            template.parent.style.opacity = "1";

            let subTemplate = this.templateManager.getTemplate(subScreen);
            if (!subTemplate) {
                return Promise.reject(subScreen + ' template not found');
            }
            return subTemplate.show((template => {
                template.parent.style.display = 'flex';
                return Promise.resolve(template);
            }));
        }));
    }

    public hideOverlayScreen() {
        let template = this.templateManager.getTemplate('overlay');
        if (!template) return Promise.reject('Overlay template not found');

        return template.hide((template => {
            template.parent.style.opacity = "0";
            let onTransitionEnd = () => {
                template.parent.removeEventListener("transitionend", onTransitionEnd);
                template.parent.style.display = 'none';
            }
            template.parent.addEventListener("transitionend", onTransitionEnd);

            let overlays = template.parent.querySelectorAll('.overlay');
            if (overlays) {
                for (let i = 0; i < overlays.length; ++i) {
                    let htmlElement = <HTMLElement>overlays.item(i);
                    htmlElement.style.display = 'none';
                }
            }

            /*return this.templateManager.getTemplate(subScreen).show((template => {
                template.parent.style.display = 'none';
                return Promise.resolve(template);
            }));*/
            return Promise.resolve(template);
        }));
    }

    public showLoadingScreen() {
        let template = this.templateManager.getTemplate('loadingScreen');
        if (!template) return Promise.reject('oading Screen template not found');

        return template.show((template => {

            var canvasRect = this.containerElement.getBoundingClientRect();
            var canvasPositioning = window.getComputedStyle(this.containerElement).position;

            template.parent.style.display = 'flex';
            template.parent.style.width = canvasRect.width + "px";
            template.parent.style.height = canvasRect.height + "px";
            template.parent.style.opacity = "1";
            // from the configuration!!!
            template.parent.style.backgroundColor = "black";
            return Promise.resolve(template);
        }));
    }

    public hideLoadingScreen() {
        let template = this.templateManager.getTemplate('loadingScreen');
        if (!template) return Promise.reject('oading Screen template not found');

        return template.hide((template => {
            template.parent.style.opacity = "0";
            let onTransitionEnd = () => {
                template.parent.removeEventListener("transitionend", onTransitionEnd);
                template.parent.style.display = 'none';
            }
            template.parent.addEventListener("transitionend", onTransitionEnd);
            return Promise.resolve(template);
        }));
    }

    protected configureLights(lightsConfiguration: { [name: string]: ILightConfiguration | boolean } = {}, focusMeshes: Array<AbstractMesh> = this.scene.meshes) {
        super.configureLights(lightsConfiguration, focusMeshes);
        console.log("flashlight", this.configuration.lab);
        // labs feature - flashlight
        if (this.configuration.lab && this.configuration.lab.flashlight) {
            let pointerPosition = BABYLON.Vector3.Zero();
            let lightTarget;
            let angle = 0.5;
            let exponent = Math.PI / 2;
            if (typeof this.configuration.lab.flashlight === "object") {
                exponent = this.configuration.lab.flashlight.exponent || exponent;
                angle = this.configuration.lab.flashlight.angle || angle;
            }
            var flashlight = new SpotLight("flashlight", Vector3.Zero(),
                Vector3.Zero(), exponent, angle, this.scene);
            if (typeof this.configuration.lab.flashlight === "object") {
                flashlight.intensity = this.configuration.lab.flashlight.intensity || flashlight.intensity;
                if (this.configuration.lab.flashlight.diffuse) {
                    flashlight.diffuse.r = this.configuration.lab.flashlight.diffuse.r;
                    flashlight.diffuse.g = this.configuration.lab.flashlight.diffuse.g;
                    flashlight.diffuse.b = this.configuration.lab.flashlight.diffuse.b;
                }
                if (this.configuration.lab.flashlight.specular) {
                    flashlight.specular.r = this.configuration.lab.flashlight.specular.r;
                    flashlight.specular.g = this.configuration.lab.flashlight.specular.g;
                    flashlight.specular.b = this.configuration.lab.flashlight.specular.b;
                }

            }
            this.scene.constantlyUpdateMeshUnderPointer = true;
            this.scene.onPointerObservable.add((eventData, eventState) => {
                if (eventData.type === 4 && eventData.pickInfo) {
                    lightTarget = (eventData.pickInfo.pickedPoint);
                } else {
                    lightTarget = undefined;
                }
            });
            let updateFlashlightFunction = () => {
                if (this.camera && flashlight) {
                    flashlight.position.copyFrom(this.camera.position);
                    if (lightTarget) {
                        lightTarget.subtractToRef(flashlight.position, flashlight.direction);
                    }
                }
            }
            this.scene.registerBeforeRender(updateFlashlightFunction);
            this.registeredOnBeforerenderFunctions.push(updateFlashlightFunction);
        }
    }
}