import { ref } from 'vue'
import { fabric } from 'fabric-with-all'
import { createId } from '../../tools/tools'
import { exportObjectsToImage } from '../tools/exportMethod'

export class LayerManager {
	stateManager: any
	canvasManager: any
	layers: any
	activeID: any
	constructor(options) {
		this.stateManager = options.stateManager;
		this.canvasManager = options.canvasManager;
		this.layers = ref([])
		this.activeID = ref("")
	}
	setActiveID(id: string, isActive = true) {
		this.activeID.value = id
		if (isActive) {
			this.canvasManager.setActiveObjectByID(id)
		}
	}
	getLayerByID(id) {
		return this.layers.value.find((item: any) => item.info.id === id)
	}
	setLayerNameByID(id, name: string) {
		const layer = this.getLayerByID(id)
		if (layer) {
			layer.info.name = name
			this.canvasManager.renderAll()
		}
	}
	setLayerVisibleByID(id, visible: boolean) {
		const layer = this.getLayerByID(id)
		if (layer) {
			layer.set({
				visible: visible
			})
			this.canvasManager.renderAll()
		}
	}
	deleteLayerByID(id, isActive = true) {
		this.canvasManager.deleteObjectById(id)
		if (id === this.activeID.value && isActive) {
			this.setActiveID(this.layers.value[0]?.info?.id || "")
		}
	}
	// 拖拽排序
	dragSort(id, newIndex) {
		const index = Math.abs(this.layers.value.length - newIndex - 1)
		this.canvasManager.dragSort(id, index)
	}
	// 更新图层列表
	updateLayers() {
		this.layers.value = this.canvasManager.getObjects().filter((v: any) => !!v?.info?.id).reverse()
		window["layers"] = this.layers
	}
	// 更新图层参数
	updateLayerParams(layer, keys = []) {
		this.layers.value.forEach((item: any) => {
			if (item.info.id === layer.info.id) {
				keys.forEach((key: string) => {
					item.set(key, layer[key])
				})
			}
		})
	}

	/** 设置图层位置-不设置默认居中 */
	setLayerPosition(layer, options?: any) {
		const width = this.canvasManager.canvasWidth
		const height = this.canvasManager.canvasHeight

		if (options && options.top !== undefined) {
			layer.set({ top: options.top })
		} else {
			layer.set({ top: height / 2 - layer.height * layer.scaleY / 2 })
		}
		if (options && options.left !== undefined) {
			layer.set({ left: options.left })
		} else {
			layer.set({ left: width / 2 - layer.width * layer.scaleX / 2 })
		}
	}
	/** 创建空图层 */
	createEmptyLayer() {
		const emptyLayer = new fabric.Rect({
			width: 0,
			height: 0,
			fill: 'transparent',
			info: {
				id: createId("image"),
				name: '空图层',
			}
		})
		this.setLayerPosition(emptyLayer)
		this.canvasManager.add(emptyLayer)
		return emptyLayer
	}
	/** 创建文本图层 */
	createTextLayer(text: string, options?: any) {
		const textLayer = new fabric.IText(text, {
			fontSize: 24,
			fill: '#000',
			...(options || {}),
			info: {
				id: createId("text"),
				name: '文本图层',
				...(options?.info || {}),
			}
		})
		this.setLayerPosition(textLayer, options)
		this.canvasManager.add(textLayer)
		return textLayer
	}
	/** 创建矩形图层 */
	createRectLayer(options?: any) {
		const rectLayer = new fabric.Rect({
			width: 100,
			height: 100,
			fill: '#000',
			...(options || {}),
			info: {
				id: createId("rect"),
				name: '矩形图层',
				...(options?.info || {}),
			}
		})
		this.setLayerPosition(rectLayer, options)
		this.canvasManager.add(rectLayer)
		return rectLayer
	}
	/** 创建圆形图层 */
	createCircleLayer(options?: any) {
		const circleLayer = new fabric.Circle({
			radius: 50,
			fill: '#000',
			...(options || {}),
			info: {
				id: createId("circle"),
				name: '圆形图层',
				...(options?.info || {}),
			}
		})
		this.setLayerPosition(circleLayer, options)
		this.canvasManager.add(circleLayer)
		return circleLayer
	}
	/** 创建图片图层 */
	async createImageLayer(imgOrUrl: string | HTMLImageElement, options?: any) {
		const canvasWidth = this.canvasManager.canvasWidth
		const canvasHeight = this.canvasManager.canvasHeight

		const imageLayer = await new Promise((resolve) => {
			const url = typeof imgOrUrl === 'string' ? imgOrUrl : imgOrUrl.src
			fabric.Image.fromURL(url, (img) => {
				const width = img.width
				const height = img.height
				const scaleX = width > canvasWidth ? canvasWidth * 0.8 / width : 1
				const scaleY = height > canvasHeight ? canvasHeight * 0.8 / height : 1
				const scale = Math.min(scaleX, scaleY)
				img.set({
					scaleX: scale,
					scaleY: scale,
					...(options || {}),
					info: {
						id: createId("image"),
						name: "图片图层",
						...(options?.info || {}),
					}
				})
				resolve(img)
			})
		}) as fabric.Object
		this.setLayerPosition(imageLayer, options)
		this.canvasManager.add(imageLayer)
		this.setActiveID(imageLayer.info.id)
		return imageLayer
	}



	/** 合并图层 */
	async imageMergeToLayer(targetLayer: fabric.Object, fabricImage: fabric.Object) {
		const info = await exportObjectsToImage([targetLayer, fabricImage], true)
		const mergedImage = await new Promise((resolve) => {
			fabric.Image.fromURL(info.url, (img) => {
				img.set({
					left: info.left,
					top: info.top,
					info: {
						id: createId("image"),
						name: targetLayer?.info?.name || "合并图层",
					}
				})
				resolve(img)
			})
		})
		// console.log(mergedImage)
		const index = this.canvasManager.getObjects().indexOf(targetLayer);
		this.deleteLayerByID(targetLayer.info.id, false)
		this.setActiveID(mergedImage.info.id, false)
		this.canvasManager.add(mergedImage, false);
		this.canvasManager.canvas.moveTo(mergedImage, index);
		this.canvasManager.renderAll()
		this.updateLayers()
		return true;
	}
	/** 设置激活对象可擦除 */
	setActiveObjectErasable() {
		const objects = this.canvasManager.getObjects()
		objects.forEach((item: any) => {
			item.set({
				erasable: item.info.id === this.activeID.value
			})
		})
	}
	dispose() {}
}