<template>
	<div class="sc-upload-multiple">
		<el-upload ref="uploader" list-type="picture-card"
			v-model:file-list="defaultFileList"
			action=""
			accept="image/gif, image/jpeg, image/png, video/mp4 , video/avi"
			:limit="limit"
			:multiple="multiple"
			:disabled="disabled"
			show-file-list
			:http-request="request"
			:before-upload="before"
			:on-success="success"
			:on-error="error"
			:on-exceed="handleExceed">
			<slot>
				<el-icon><el-icon-plus /></el-icon>
			</slot>
			<template #tip>
				<div v-if="tip" class="el-upload__tip">{{ tip }}</div>
			</template>
			<template #file="{ file }">
				<div class="sc-upload-list-item">
					<el-image v-if="isImage(file.mineType)" class="el-upload-list__item-thumbnail" :src="'/zcxt/folder/' + file.path" :preview-src-list="preview" fit="cover" preview-teleported :z-index="9999">
						<template #placeholder>
							<div class="sc-upload-multiple-image-slot">Loading...</div>
						</template>
					</el-image>
					<sc-video v-if="isVideo(file.mineType)" :src="'/zcxt/folder/' + file.path" showMask @play="videoPlay(file)"></sc-video>

					<div v-if="!disabled && file.status == 'success'" class="sc-upload__item-actions">
						<span class="del" @click="handleRemove(file)"><el-icon><el-icon-delete /></el-icon></span>
					</div>
					<div v-if="file.status == 'ready' || file.status == 'uploading'" class="sc-upload__item-progress">
						<el-progress :percentage="file.percentage" text-inside :stroke-width="16" />
					</div>
				</div>
			</template>
		</el-upload>
		<span style="display:none!important"><el-input v-model="value"></el-input></span>
	</div>

	<sc-video-viewer v-if="showVideoViewer" :videoUrl="previewVideoUrl" hideOnModal @close="showVideoViewer = false"></sc-video-viewer>
</template>

<script>
	import { defineAsyncComponent } from "vue";
	import config from "@/config/upload";

	export default {
		components: {
			scVideo: defineAsyncComponent(() => import("@/components/scVideo")),
			scVideoViewer: defineAsyncComponent(() => import("@/components/scUpload/videoViewer"))
		},

		props: {
			modelValue: { type: Array, default: () => [] },
			tip: { type: String, default: "" },
			maxSize: { type: Number, default: 50 },
			limit: { type: Number, default: 0 },
			multiple: { type: Boolean, default: true },
			disabled: { type: Boolean, default: false },
			onSuccess: { type: Function, default: () => { return true } }
		},

		data() {
			return {
				value: "",
				defaultFileList: [],

				showVideoViewer: false,
				previewVideoUrl: ""
			}
		},

		watch: {
			modelValue(val) {
				if (JSON.stringify(val) != JSON.stringify(this.formatArr(this.defaultFileList))) {
					this.defaultFileList = val;
					this.value = val;
				}
			},

			defaultFileList: {
				deep: true,
				handler(val) {
					this.$emit("update:modelValue", this.formatArr(val));
					this.value = val.map(v => v.path).join(",");
				}
			}
		},

		computed: {
			preview() {
				return this.defaultFileList.map(v => "/zcxt/folder/" + v.path);
			}
		},

		mounted() {
			this.defaultFileList = this.modelValue;
			this.value = this.modelValue;
		},

		methods: {
			isImage(type) {
				return config.imageIncludes(type);
			},

			isVideo(type) {
				return config.videoIncludes(type);
			},

			// 格式化数组值
			formatArr(arr) {
				return arr.map(item => ({ id: item.id, name: item.name, mineType: item.mineType, path: item.path }));
			},

			before(file) {
				if (!this.isImage(file.type) && !this.isVideo(file.type)) {
					this.$message.warning({ title: "上传文件警告", message: "选择的文件非图像类/视频类文件" });
					return false;
				}

				const maxSize = file.size / 1024 / 1024 < this.maxSize;
				if (!maxSize) {
					this.$message.warning(`上传文件大小不能超过 ${this.maxSize}MB!`);
					return false;
				}
			},

			success(res, file) {
				let os = this.onSuccess(res, file);
				if (os != undefined && os == false) return false;
				
				file.name = res.fileName;
				file.path = res.path;
				file.mineType = res.mineType;
			},

			error(message) {
				this.$notify.error({ title: "上传文件未成功", message });
			},

			beforeRemove({ id, name }) {
				return this.$confirm(`是否移除 ${name}? 此操作不可逆!`, "提示", {
					type: "warning",
					confirmButtonText: "移除"
				}).then(() => {
					if (id) {
						this.$API.common.folder.rm(id).then(res => {
							if (res.code == 200) return true;
							else return false;
						}).catch(() => {
							return false;
						});
					} return true;
				}).catch(() => {
					return false;
				});
			},
			
			handleRemove(file) {
				this.$refs.uploader.handleRemove(file);
			},

			handleExceed() {
				this.$message.warning(`当前设置最多上传 ${this.limit} 个文件，请移除后上传!`);
			},

			request(param) {
				const data = new FormData();
				data.append(param.filename, param.file);
				this.$API.common.folder.up(data, {
					onUploadProgress: e => {
						const percent = parseInt(((e.loaded / e.total) * 100) | 0, 10)
						param.onProgress({ percent });
					}
				}).then(res => {
					if (res.code == 200) param.onSuccess({ path: res.expands.file, fileName: param.file.name, mineType: param.file.type })
					else param.onError(res.message || "未知错误");
				}).catch(err => param.onError(err));
			},

			videoPlay(file) {
				this.showVideoViewer = true;
				this.previewVideoUrl = "/zcxt/folder/" + file.path;
			}
		}
	}
</script>

<style scoped>
.el-form-item.is-error .sc-upload-multiple:deep(.el-upload--picture-card) {
  border-color: var(--el-color-danger);
}
:deep(.el-upload-list__item) {
  transition: none;
  border-radius: 0;
}
.sc-upload-multiple:deep(.el-upload-list__item.el-list-leave-active) {
  position: static !important;
}
.sc-upload-multiple:deep(.el-upload--picture-card) {
  border-radius: 0;
}
.sc-upload-list-item {
  width: 100%;
  height: 100%;
  position: relative;
}
.sc-upload-multiple .el-image {
  display: block;
}
.sc-upload-multiple .el-image:deep(img) {
  -webkit-user-drag: none;
}
.sc-upload-multiple-image-slot {
  display: flex;
  justify-content: center;
  align-items: center;
  width: 100%;
  height: 100%;
  font-size: 12px;
}
.sc-upload-multiple .el-upload-list__item:hover .sc-upload__item-actions {
  display: block;
}
.sc-upload__item-actions {
  position: absolute;
  top: 0;
  right: 0;
  display: none;
}
.sc-upload__item-actions span {
  display: flex;
  justify-content: center;
  align-items: center;
  width: 25px;
  height: 25px;
  cursor: pointer;
  color: #fff;
}
.sc-upload__item-actions span i {
  font-size: 12px;
}
.sc-upload__item-actions .del {
  background: #f56c6c;
}
.sc-upload__item-progress {
  position: absolute;
  width: 100%;
  height: 100%;
  top: 0;
  left: 0;
  background-color: var(--el-overlay-color-lighter);
}
</style>
