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

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)
			this.stateManager.toolManager.setTool(OperationType.SELECT)
		}
	}
	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
		}
		const object = this.canvasManager.getObjectById(id)
		if (object) {
			object.info.name = name
			this.canvasManager.renderAll()
		}
	}
	setLayerVisibleById(id, visible: boolean) {
		const layer = this.getLayerById(id)
		if (layer) {
			layer.visible = visible
		}
		const object = this.canvasManager.getObjectById(id)
		if (object) {
			object.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 || "")
		}
		if (isActive) this.stateManager.recordState()
	}
	// 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()
			.map(v => v.toObject())
	}

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

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

		const imageObject = 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(imageObject, options)
		await this.canvasManager.add(imageObject)
		this.setActiveID(imageObject.info.id)
		return imageObject
	}



	/** 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)
		await this.canvasManager.add(mergedImage);
		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
			})
		})
	}
	/** 更新图层缩略图 */
	async updateLayerThumbnailsById(id: string) {
		const object = this.canvasManager.getObjectById(id);
		if (!object) return;
		const url = await exportObjectToThumbnail(object);
		object.thumbnail = url
		this.updateLayers()
	}

	dispose() { }
}