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';
import { ViewerModel } from '../model/viewerModel';

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>, model: ViewerModel) {
        super.configureModel(modelConfiguration, model);

        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 = (model: ViewerModel) => {
        // 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);

        return;
    }

    public showOverlayScreen(subScreen: string) {
        let template = this.templateManager.getTemplate('overlay');
        if (!template) return Promise.resolve('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.resolve('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.resolve('Loading 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.resolve('Loading 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 } = {}, model: ViewerModel) {
        super.configureLights(lightsConfiguration, model);
        // 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);
        }
    }
}