<template>
	<view class="content">
		<view class="cropper-wrapper" :style="{height: cropperOpt.height + 'px'}">
			<canvas class="cropper" :disable-scroll="true" @touchstart="touchStart" @touchmove="touchMove" @touchend="touchEnd"
			 :style="{ width: cropperOpt.width, height: cropperOpt.height, backgroundColor: 'rgba(0, 0, 0, 0.8)' }" canvas-id="cropper"></canvas>
			<canvas class="cropper" :disable-scroll="true" :style="{
				 position: 'fixed',
				 top: `-${cropperOpt.width * cropperOpt.pixelRatio}px`, 
				 left: `-${cropperOpt.height * cropperOpt.pixelRatio}px`, 
				 width: `${cropperOpt.width * cropperOpt.pixelRatio}px`,
				 height: `${cropperOpt.height * cropperOpt.pixelRatio}`
			 }"
			 canvas-id="targetId">
			</canvas>
		</view>
		<view class="cropper-buttons safe-area-padding" :style="{height: bottomNavHeight + 'px'}">
			<view class="upload" @tap="uploadTap">重新选择</view>
			<view class="getCropperImage" @tap="getCropperImage(false)">确定</view>
		</view>
	</view>
</template>

<script>
	import WeCropper from './weCropper.js';
	export default {
		props: {
			// 裁剪矩形框的样式，其中可包含的属性为lineWidth-边框宽度(单位rpx)，color: 边框颜色，
			// mask-遮罩颜色，一般设置为一个rgba的透明度，如"rgba(0, 0, 0, 0.35)"
			boundStyle: {
				type: Object,
				default() {
					return {
						lineWidth: 4,
						borderColor: 'rgb(245, 245, 245)',
						mask: 'rgba(0, 0, 0, 0.35)'
					}
				}
			},
			// // 裁剪框宽度，单位rpx
			// rectWidth: {
			// 	type: [String, Number],
			// 	default: 400
			// },
			// // 裁剪框高度，单位rpx
			// rectHeight: {
			// 	type: [String, Number],
			// 	default: 400
			// },
			// // 输出图片宽度，单位rpx
			// destWidth: {
			// 	type: [String, Number],
			// 	default: 400
			// },
			// // 输出图片高度，单位rpx
			// destHeight: {
			// 	type: [String, Number],
			// 	default: 400
			// },
			// // 输出的图片类型，如果发现裁剪的图片很大，可能是因为设置为了"png"，改成"jpg"即可
			// fileType: {
			// 	type: String,
			// 	default: 'jpg',
			// },
			// // 生成的图片质量
			// // H5上无效，目前不考虑使用此参数
			// quality: {
			// 	type: [Number, String],
			// 	default: 1
			// }
		},
		data() {
			return {
				// 底部导航的高度
				bottomNavHeight: 50,
				originWidth: 200,
				width: 0,
				height: 0,
				cropperOpt: {
					id: 'cropper',
					targetId: 'targetCropper',
					pixelRatio: 1,
					width: 0,
					height: 0,
					scale: 2.5,
					zoom: 8,
					cut: {
						x: (this.width - this.originWidth) / 2,
						y: (this.height - this.originWidth) / 2,
						width: this.originWidth,
						height: this.originWidth,
					},
					boundStyle: {
						lineWidth: uni.upx2px(this.boundStyle.lineWidth),
						mask: this.boundStyle.mask,
						color: this.boundStyle.borderColor
					},
				},
				// 裁剪框和输出图片的尺寸，高度默认等于宽度
				// 输出图片宽度，单位px
				destWidth: 200,
				// 裁剪框宽度，单位px
				rectWidth: 200,
				// 输出的图片类型，如果'png'类型发现裁剪的图片太大，改成"jpg"即可
				fileType: 'jpg',
			}
		},
		onLoad(option) {
			let rectInfo = uni.getSystemInfoSync();
			this.width = rectInfo.windowWidth;
			this.height = rectInfo.windowHeight - this.bottomNavHeight;
			this.cropperOpt.width = this.width;
			this.cropperOpt.height = this.height;
			this.cropperOpt.pixelRatio = rectInfo.pixelRatio;
			
			if(option.destWidth) this.destWidth = option.destWidth;
			if(option.rectWidth){
				let rectWidth = Number(option.rectWidth);
				this.cropperOpt.cut = {
					x: (this.width - rectWidth) / 2,
					y: (this.height - rectWidth) / 2,
					width: rectWidth,
					height: rectWidth,
				}
			} this.rectWidth = option.rectWidth;
			if(option.fileType) this.fileType = option.fileType;
			// 初始化
			this.cropper = new WeCropper(this.cropperOpt)
			.on('ready', (ctx) => {
				// console.log(`wecropper is ready for work!`)
			})
			.on('beforeImageLoad', (ctx) => {
				// console.log(`before picture loaded, i can do something`)
			})
			.on('imageLoad', (ctx) => {
				// console.log(`picture loaded`)
			})
			.on('beforeDraw', (ctx, instance) => {
				// console.log(`before canvas draw,i can do something`)
			})
			// 设置导航栏样式，以免用户在page.json中没有设置为黑色背景
			uni.setNavigationBarColor({
			    frontColor: '#ffffff',
			    backgroundColor: '#000000',
			})
			uni.chooseImage({
				count: 1, // 默认9
				sizeType: ['compressed'], // 可以指定是原图还是压缩图，默认二者都有
				sourceType: ['album', 'camera'], // 可以指定来源是相册还是相机，默认二者都有
				success: (res) => {
					let src = res.tempFilePaths[0];
					//  获取裁剪图片资源后，给data添加src属性及其值
					this.cropper.pushOrign(src);
				}
			});
		},
		methods: {
			touchStart(e) {
				this.cropper.touchStart(e)
			},
			touchMove(e) {
				this.cropper.touchMove(e)
			},
			touchEnd(e) {
				this.cropper.touchEnd(e)
			},
			getCropperImage(isPre = false) {
				let cropper_opt = {
					destHeight:  Number(this.destWidth), // uni.canvasToTempFilePath要求这些参数为数值
					destWidth:  Number(this.destWidth),
					fileType: this.fileType,
				}
				this.cropper.getCropperImage(cropper_opt, (path, err) => {
					if (err) {
						uni.showModal({
							title: '温馨提示',
							content: err.message
						})
					} else {
						if(isPre) {
							uni.previewImage({
								current: '', // 当前显示图片的 http 链接
								urls: [path] // 需要预览的图片 http 链接列表
							})
						} else {
							uni.$emit('uAvatarCropper', path);
							this.$u.route({
								type: 'back'
							})
						}
					}
				})
			},
			uploadTap() {
				const self = this
				uni.chooseImage({
					count: 1, // 默认9
					sizeType: ['original', 'compressed'], // 可以指定是原图还是压缩图，默认二者都有
					sourceType: ['album', 'camera'], // 可以指定来源是相册还是相机，默认二者都有
					success(res) {
						const src = res.tempFilePaths[0]
						//  获取裁剪图片资源后，给data添加src属性及其值

						self.cropper.pushOrign(src)
					}
				})
			},
		}
	}
</script>

<style scoped>
	.content {
		background: rgba(255, 255, 255, 1);
	}

	.cropper {
		position: absolute;
		top: 0;
		left: 0;
		width: 100%;
		height: 100%;
		z-index: 99999999999999;
	}

	.cropper-buttons {
		background-color: #000000;
		color: #eee;
	}

	.cropper-wrapper {
		position: relative;
		display: flex;
		flex-direction: row;
		justify-content: space-between;
		align-items: center;
		width: 100%;
		background-color: #000;
	}

	.cropper-buttons {
		width: 100vw;
		display: flex;
		flex-direction: row;
		justify-content: space-between;
		align-items: center;
		position: fixed;
		bottom: 0;
		left: 0;
		font-size: 28rpx;
	}

	.cropper-buttons .upload,
	.cropper-buttons .getCropperImage {
		width: 50%;
		text-align: center;
	}
	
	.cropper-buttons .upload {
		text-align: left;
		padding-left: 50rpx;
	}
	
	.cropper-buttons .getCropperImage {
		text-align: right;
		padding-right: 50rpx;
	}
</style>