import { getId } from './utils.js'
import { DOMScatter } from './scatter.js'
import { InteractionMapper } from './interaction.js'

export class CardLoader {
    constructor(
        src,
        {
            x = 0,
            y = 0,
            width = 1000,
            height = 800,
            maxWidth = null,
            maxHeight = null,
            scale = 1,
            minScale = 0.5,
            maxScale = 1.5,
            rotation = 0
        } = {}
    ) {
        this.src = src
        this.x = x
        this.y = y
        this.scale = scale
        this.rotation = 0
        this.maxScale = maxScale
        this.minScale = minScale
        this.wantedWidth = width
        this.wantedHeight = height
        this.maxWidth = maxWidth != null ? maxWidth : window.innerWidth
        this.maxHeight = maxHeight != null ? maxHeight : window.innerHeight
        this.addedNode = null
        console.log({

            width,
            height,
            maxWidth,
            maxHeight,

        })
    }

    unload() {
        if (this.addedNode) {
            this.addedNode.remove()
            this.addedNode = null
        }
    }
}

export class PDFLoader extends CardLoader {
    constructor(src, { width = 1640, height = 800, scale = 1 } = {}) {
        super(src, { width, height, scale })
        if (typeof PDFJS == 'undefined') {
            alert('PDF.js needed')
        }
    }

    load(domNode) {
        return new Promise((resolve, reject) => {
            PDFJS.getDocument(this.src).then(pdf => {
                pdf.getPage(1).then(page => {
                    let scale = this.scale * app.renderer.resolution
                    let invScale = 1 / scale
                    let viewport = page.getViewport(scale)

                    // Prepare canvas using PDF page dimensions.
                    let canvas = document.createElement('canvas')
                    let context = canvas.getContext('2d')
                    canvas.height = viewport.height
                    canvas.width = viewport.width

                    // Render PDF page into canvas context.
                    let renderContext = {
                        canvasContext: context,
                        viewport: viewport
                    }
                    page.render(renderContext)
                    domNode.appendChild(canvas)
                    this.wantedWidth = canvas.width
                    this.wantedHeight = canvas.height
                    this.scale = invScale
                    this.addedNode = canvas
                    resolve(this)
                })
            })
        })
    }
}

export class ImageLoader extends CardLoader {
    load(domNode) {
        return new Promise((resolve, reject) => {
            let isImage = domNode instanceof HTMLImageElement
            let image = isImage ? domNode : document.createElement('img')
            image.onload = e => {
                if (!isImage) {
                    domNode.appendChild(image)
                    this.addedNode = image
                }
                this.wantedWidth = image.naturalWidth
                this.wantedHeight = image.naturalHeight

                let scaleW = this.maxWidth / image.naturalWidth
                let scaleH = this.maxHeight / image.naturalHeight
                this.scale = Math.min(this.maxScale, Math.min(scaleW, scaleH))
                image.setAttribute('draggable', false)
                image.width = image.naturalWidth
                image.height = image.naturalHeight
                resolve(this)
            }
            image.onerror = e => {
                reject(this)
            }
            image.src = this.src
        })
    }
}

export class FrameLoader extends CardLoader {
    load(domNode) {
        return new Promise((resolve, reject) => {
            let isFrame = domNode instanceof HTMLIFrameElement
            let iframe = isFrame ? domNode : document.createElement('iframe')
            console.log('FrameLoader.load', isFrame, iframe, this.src)
            iframe.frameBorder = 0
            iframe.style.scrolling = false
            iframe.width = this.wantedWidth
            iframe.height = this.wantedHeight
            if (!isFrame) {
                // Unlike img onload is only triggered if the iframe is part of the DOM tree
                domNode.appendChild(iframe)
                this.addedNode = iframe
            }
            iframe.onload = e => {
                resolve(this)
            }
            iframe.onerror = e => {
                reject(this)
            }
            iframe.src = this.src
        })
    }
}

export class HTMLLoader extends CardLoader {
    load(domNode) {
        return new Promise((resolve, reject) => {
            let xhr = new XMLHttpRequest()
            xhr.open('GET', this.src, false)
            xhr.onload = e => {
                domNode.innerHTML = xhr.response
                this.addedNode = domNode.firstElementChild
                let { width, height } = this.size(this.addedNode)
                console.log("HTMLLoader.load", { added: this.addedNode, width, height })
                if (width)
                    this.wantedWidth = width || this.wantedWidth
                if (height)
                    this.wantedHeight = height || this.wantedHeight
                resolve(this)
            }
            xhr.onerror = e => {
                reject(this)
            }
            xhr.send()
        })
    }

    /**
     * Tries to determine the size of the addedNode.
     * Checks for explicit width and height style attributes.
     * 
     * Overwrite this method if you want to extract values from other infos.
     *
     * @returns { width: int, height: int }
     * @memberof HTMLLoader
     */
    size(node) {
        let width = parseInt(node.style.width) || null
        let height = parseInt(node.style.height) || null
        return { width, height }
    }
}

export class DOMFlip {
    constructor(
        domScatterContainer,
        flipTemplate,
        frontLoader,
        backLoader,
        {
            closeOnMinScale = false,
            flipDuration = 1,
            fadeDuration = 0.2,
            overdoScaling = 1,
            autoLoad = false,
            center = null,
            preloadBack = false,
            translatable = true,
            scalable = true,
            rotatable = true,
            clickOnTap = false,
            onFront = null,
            onBack = null,
            onClose = null,
            onUpdate = null,
            onRemoved = null,
            onLoaded = null
        } = {}
    ) {
        this.domScatterContainer = domScatterContainer
        this.id = getId()
        this.flipDuration = flipDuration
        this.fadeDuration = fadeDuration
        this.closeOnMinScale = closeOnMinScale
        this.flipTemplate = flipTemplate
        this.frontLoader = frontLoader
        this.backLoader = backLoader
        this.translatable = translatable
        this.scalable = scalable
        this.rotatable = rotatable
        this.clickOnTap = clickOnTap
        this.onFrontFlipped = onFront
        this.onBackFlipped = onBack
        this.onClose = onClose
        this.onRemoved = onRemoved
        this.onUpdate = onUpdate
        this.onLoaded = onLoaded
        this.center = center
        this.preloadBack = preloadBack
        this.overdoScaling = overdoScaling
        if (autoLoad) {
            this.load()
        }
    }

    load() {
        return new Promise((resolve, reject) => {
            let t = this.flipTemplate
            let dom = this.domScatterContainer.element
            let wrapper = t.content.querySelector('.flipWrapper')
            wrapper.id = this.id
            let clone = document.importNode(t.content, true)
            dom.appendChild(clone)
            // We cannot use the document fragment itself because it
            // is not part of the main dom tree. After the appendChild
            // call we can access the new dom element by id
            this.cardWrapper = dom.querySelector('#' + this.id)
            let front = this.cardWrapper.querySelector('.front')
            this.frontLoader.load(front).then(loader => {
                this.frontLoaded(loader).then((obj) => {
                    if (this.onLoaded) this.onLoaded()
                    resolve(this)
                })
            })
        })
    }

    frontLoaded(loader) {
        return new Promise((resolve, reject) => {
            let scatter = new DOMScatter(
                this.cardWrapper,
                this.domScatterContainer,
                {
                    x: loader.x,
                    y: loader.y,
                    startScale: loader.scale,
                    scale: loader.scale,
                    maxScale: loader.maxScale,
                    minScale: loader.minScale,
                    width: loader.wantedWidth,
                    height: loader.wantedHeight,
                    rotation: loader.rotation,
                    translatable: this.translatable,
                    scalable: this.scalable,
                    rotatable: this.rotatable,
                    overdoScaling: this.overdoScaling,
                    clickOnTap: this.clickOnTap
                }
            )

            if (this.center) {
                scatter.centerAt(this.center)
            }

            if (this.closeOnMinScale) {
                const removeOnMinScale = function () {
                    if (scatter.scale <= scatter.minScale) {
                        this.flippable.close()

                        // 'Disable' overdoscaling to avoid weird jumps on close.
                        scatter.minScale /= scatter.overdoScaling
                        scatter.overdoScaling = 1

                        //Remove callback
                        if (scatter.onTransform) {
                            let callbackIdx = scatter.onTransform.indexOf(removeOnMinScale)
                            scatter.onTransform.splice(callbackIdx, 1)
                        }
                    }
                }.bind(this)
                scatter.addTransformEventCallback(removeOnMinScale)
            }

            let flippable = new DOMFlippable(this.cardWrapper, scatter, this)
            let back = this.cardWrapper.querySelector('.back')

            if (this.preloadBack) {
                this.backLoader.load(back).then(loader => {
                    this.setupFlippable(flippable, loader)
                })
            }
            this.flippable = flippable
            resolve(this)
        })
    }

    centerAt(p) {
        this.center = p
        this.flippable.centerAt(p)
    }

    zoom(scale) {
        this.flippable.zoom(scale)
    }

    setupFlippable(flippable, loader) {
        console.log("setupFlippable", loader.wantedWidth)
        flippable.wantedWidth = loader.wantedWidth
        flippable.wantedHeight = loader.wantedHeight
        flippable.wantedScale = loader.scale
        flippable.minScale = loader.minScale
        flippable.maxScale = loader.maxScale
        flippable.scaleButtons()
    }

    start({ targetCenter = null } = {}) {
        console.log("DOMFlip.start", targetCenter)
        if (this.preloadBack) {
            
            this.flippable.start({ duration: this.flipDuration, targetCenter })
        }
        else {
            let back = this.cardWrapper.querySelector('.back')
            let flippable = this.flippable
            this.backLoader.load(back).then(loader => {
                this.setupFlippable(flippable, loader)
                flippable.start({ duration: this.flipDuration, targetCenter })
            })
        }
    }

    fadeOutAndRemove() {
        TweenLite.to(this.cardWrapper, this.fadeDuration, {
            opacity: 0,
            onComplete: () => {
                this.cardWrapper.remove()
            }
        })
    }

    closed() {
        this.unload()
    }

    unload() {
        if (!this.preloadBack) {
            this.backLoader.unload()
        }
    }
}

export class DOMFlippable {
    constructor(element, scatter, flip) {
        // Set log to console.log or a custom log function
        // define data structures to store our touchpoints in

        this.element = element
        this.flip = flip
        this.card = element.querySelector('.flipCard')
        this.front = element.querySelector('.front')
        this.back = element.querySelector('.back')
        this.flipped = false
        this.scatter = scatter
        this.onFrontFlipped = flip.onFrontFlipped
        this.onBackFlipped = flip.onBackFlipped
        this.onClose = flip.onClose
        this.onRemoved = flip.onRemoved
        this.onUpdate = flip.onUpdate

        this.wantedWidth = scatter.width
        this.wantedHeight = scatter.height
        this.wantedScale = scatter.scale
        this.minScale = scatter.minScale
        this.maxScale = scatter.maxScale

        this.flipDuration = flip.flipDuration
        this.fadeDuration = flip.fadeDuration
        scatter.addTransformEventCallback(this.scatterTransformed.bind(this))

        TweenLite.set(this.element, { perspective: 5000 })
        TweenLite.set(this.card, { transformStyle: 'preserve-3d' })
        TweenLite.set(this.back, { rotationY: -180 })
        TweenLite.set([this.back, this.front], {
            backfaceVisibility: 'hidden',
            perspective: 5000
        })
        TweenLite.set(this.front, { visibility: 'visible' })
        this.infoBtn = element.querySelector('.infoBtn')
        this.backBtn = element.querySelector('.backBtn')
        this.closeBtn = element.querySelector('.closeBtn')
        /* Buttons are not guaranteed to exist. */

        if (this.infoBtn) {
            scatter.addTapListener(this.infoBtn, event => {
                this.flip.start()
            })
            this.enable(this.infoBtn)
        }
        if (this.backBtn) {
            scatter.addTapListener(this.backBtn, event => {
                this.start()
            })
        }
        if (this.closeBtn) {
            scatter.addTapListener(this.closeBtn, event => {
                this.close()
            })
            this.enable(this.closeBtn)
        }
        this.scaleButtons()
        this.bringToFront()
    }

    close() {
        this.disable(this.infoBtn)
        this.disable(this.closeBtn)
        if (this.onClose) {
            this.onClose(this)
            this.flip.closed()
        } else {
            this.scatter.zoom(0.1, {
                animate: this.fadeDuration,
                onComplete: () => {
                    this.element.remove()
                    this.flip.closed()
                    if (this.onRemoved) {
                        this.onRemoved.call(this)
                    }
                }
            })
        }
    }

    showFront() {
        TweenLite.set(this.front, { visibility: 'visible' })
    }

    centerAt(p) {
        this.scatter.centerAt(p)
    }

    zoom(scale) {
        this.scatter.zoom(scale)
    }

    get buttonScale() {
        let iscale = 1.0

        if (this.scatter != null) {
            let scale = this.scatter.scale || 1
            iscale = 1.0 / scale
        }
        return iscale
    }

    scaleButtons() {
        TweenLite.set([this.infoBtn, this.backBtn, this.closeBtn], {
            scale: this.buttonScale
        })
    }

    bringToFront() {
        this.scatter.bringToFront()
        TweenLite.set(this.element, { zIndex: DOMScatter.zIndex++ })
    }

    clickInfo() {
        this.bringToFront()
        console.log("clickInfo")
        this.infoBtn.click()
    }

    scatterTransformed(event) {
        this.scaleButtons()
    }

    targetRotation(alpha) {
        let ortho = 90
        let rest = alpha % ortho
        let delta = 0.0
        if (rest > ortho / 2.0) {
            delta = ortho - rest
        } else {
            delta = -rest
        }
        return delta
    }

    infoValues(info) {
        let startX = this.element._gsTransform.x
        let startY = this.element._gsTransform.y
        let startAngle = this.element._gsTransform.rotation
        let startScale = this.element._gsTransform.scaleX
        let w = this.element.style.width
        let h = this.element.style.height
        console.log(info, startX, startY, startAngle, startScale, w, h)
    }

    show(element, duration = 0, alpha = 1) {
        if (element) {
            TweenLite.to(element, duration, { autoAlpha: alpha }) // visibility: 'visible', display: 'initial'})
        }
    }

    hide(element, duration = 0, alpha = 0) {
        if (element) {
            TweenLite.to(element, duration, { autoAlpha: alpha }) // {visibility: 'hidden', display: 'none'})
        }
    }

    enable(button) {
        this.show(button, this.fadeDuration)
        if (button) {
            TweenLite.set(button, { pointerEvents: 'auto' })
        }
    }

    disable(button) {
        this.hide(button, this.fadeDuration)
        if (button) {
            TweenLite.set(button, { pointerEvents: 'none' })
        }
    }

    start({ targetCenter = null } = {}) {
        this.bringToFront()
        if (!this.flipped) {
            this.startX = this.element._gsTransform.x
            this.startY = this.element._gsTransform.y
            this.startAngle = this.element._gsTransform.rotation
            this.startScale = this.element._gsTransform.scaleX
            this.startWidth = this.element.style.width
            this.startHeight = this.element.style.height
            this.scatterStartWidth = this.scatter.width
            this.scatterStartHeight = this.scatter.height
            this.show(this.back)
            this.disable(this.infoBtn)
            this.disable(this.closeBtn)
        } else {
            this.show(this.front, this.fadeDuration)
            this.disable(this.backBtn)
        }
        let { scalable, translatable, rotatable } = this.scatter
        this.saved = { scalable, translatable, rotatable }
        this.scatter.scalable = false
        this.scatter.translatable = false
        this.scatter.rotatable = false
        this.scatter.killAnimation()

        this.flipped = !this.flipped
        let targetY = this.flipped ? 180 : 0
        let targetZ = this.flipped
            ? this.startAngle + this.targetRotation(this.startAngle)
            : this.startAngle
        let targetScale = this.flipped ? this.wantedScale : this.startScale
        let w = this.flipped ? this.wantedWidth : this.startWidth
        let h = this.flipped ? this.wantedHeight : this.startHeight
        let dw = this.wantedWidth - this.scatter.width
        let dh = this.wantedHeight - this.scatter.height
        let tc = targetCenter
        let xx = tc != null ? tc.x - w / 2 : this.startX - dw / 2
        let yy = tc != null ? tc.y - h / 2 : this.startY - dh / 2
        let x = this.flipped ? xx : this.startX
        let y = this.flipped ? yy : this.startY

        let onUpdate = this.onUpdate !== null ? () => this.onUpdate(this) : null
        console.log("start", this.flipDuration)
        TweenLite.to(this.card, this.flipDuration, {
            rotationY: targetY,
            ease: Power1.easeOut,
            transformOrigin: '50% 50%',
            onUpdate,
            onComplete: e => {
                console.log("start end", this.flipDuration)
                if (this.flipped) {
                    //this.hide(this.front)
                    this.enable(this.backBtn)
                    this.show(this.backBtn)

                    if (this.onFrontFlipped) {
                        this.onFrontFlipped(this)
                    }
                } else {

                    if (this.onBackFlipped == null) {
                        this.enable(this.infoBtn, this.fadeDuration)
                        this.enable(this.closeBtn, this.fadeDuration)
                    } else {
                        this.onBackFlipped(this)
                    }
                    this.flip.unload()
                }
                this.scatter.scale = targetScale
                this.scaleButtons()
                this.scatter.rotationDegrees = targetZ
                this.scatter.width = this.flipped ? w : this.scatterStartWidth
                this.scatter.height = this.flipped ? h : this.scatterStartHeight

                let { scalable, translatable, rotatable } = this.saved
                this.scatter.scalable = scalable
                this.scatter.translatable = translatable
                this.scatter.rotatable = rotatable
            },
            force3D: true
        })

        console.log("start 2", this.wantedWidth, this.startWidth, {w, h})
        // See https://greensock.com/forums/topic/7997-rotate-the-shortest-way/
        TweenLite.to(this.element, this.flipDuration / 2, {
            scale: targetScale,
            ease: Power1.easeOut,
            rotationZ: targetZ + '_short',
            transformOrigin: '50% 50%',
            width: w,
            height: h,
            x: x,
            y: y,
            onComplete: e => {
                if (this.flipped) {
                    this.hide(this.front)
                    // this.hide(this.infoBtn)
                } else {
                    this.hide(this.back)
                    // this.show(this.infoBtn)
                }
            }
        })
    }
}