<template>
	<div class="cl-upload__wrap" :class="[customClass]">
		<div
			class="cl-upload"
			:class="[
				`cl-upload--${type}`,
				{
					'is-disabled': disabled,
					'is-drag': drag
				}
			]"
		>
			<template v-if="!drag">
				<div class="cl-upload__file-btn" v-if="type == 'file'">
					<el-upload
						:ref="setRefs('upload')"
						:drag="drag"
						action=""
						:accept="accept"
						:show-file-list="false"
						:before-upload="onBeforeUpload"
						:http-request="httpRequest"
						:headers="headers"
						:multiple="multiple"
						:disabled="disabled"
					>
						<slot>
							<el-button type="success">{{ text }}</el-button>
						</slot>
					</el-upload>
				</div>
			</template>

			<!-- 列表 -->
			<draggable
				class="cl-upload__list"
				tag="div"
				v-model="list"
				ghost-class="Ghost"
				drag-class="Drag"
				:options="{
					group: 'Upload',
					animation: 300,
					draggable: '.is-drag',
					disabled: !draggable
				}"
				item-key="uid"
				@end="update"
				v-if="showFileList"
			>
				<!-- 触发器 -->
				<template #footer>
					<div class="cl-upload__footer" v-if="(type == 'image' || drag) && isAdd">
						<el-upload
							action=""
							:drag="drag"
							:ref="setRefs('upload')"
							:accept="accept"
							:show-file-list="false"
							:before-upload="onBeforeUpload"
							:http-request="httpRequest"
							:headers="headers"
							:multiple="multiple"
							:disabled="disabled"
						>
							<slot>
								<div class="cl-upload__demo is-dragger" v-if="drag">
									<el-icon :size="46">
										<upload-filled />
									</el-icon>
									<div>
										点击上传或将文件拖动到此处，文件大小限制{{ limitSize }}M
									</div>
								</div>

								<div class="cl-upload__demo" v-else>
									<el-icon :size="36">
										<component :is="icon" v-if="icon" />
										<picture-filled v-else />
									</el-icon>
									<span v-if="text">{{ text }}</span>
								</div>
							</slot>
						</el-upload>
					</div>
				</template>

				<!-- 列表 -->
				<template #item="{ element: item, index }">
					<el-upload
						class="is-drag"
						action=""
						:accept="accept"
						:show-file-list="false"
						:http-request="
							(req) => {
								return httpRequest(req, item);
							}
						"
						:before-upload="
							(file) => {
								onBeforeUpload(file, item);
							}
						"
						:headers="headers"
						:disabled="disabled"
						v-if="showFileList"
					>
						<slot name="item" :item="item" :index="index">
							<div class="cl-upload__item">
								<upload-item
									:item="item"
									:list="list"
									:disabled="disabled"
									:deletable="deletable"
									@remove="remove(index)"
								/>
							</div>
						</slot>
					</el-upload>
				</template>
			</draggable>
		</div>
	</div>
</template>

<script lang="ts" setup name="cl-upload">
import { computed, ref, watch, type PropType, nextTick } from "vue";
import { isArray, isNumber } from "lodash-es";
import Draggable from "vuedraggable";
import { ElMessage } from "element-plus";
import { PictureFilled, UploadFilled } from "@element-plus/icons-vue";
import { useForm } from "@cool-vue/crud";
import { useCool } from "/@/cool";
import { useBase } from "/$/base";
import { uuid, isPromise } from "/@/cool/utils";
import { getUrls, getType } from "../utils";
import { useUpload } from "../hooks";
import UploadItem from "./upload-item/index.vue";
import type { Upload } from "../types";

const props = defineProps({
	// 绑定值，单选时字符串，多选时字符串数组
	modelValue: {
		type: [String, Array],
		default: () => []
	},
	// 上传类型
	type: {
		type: String as PropType<"image" | "file">,
		default: "image"
	},
	// 允许上传的文件类型
	accept: String,
	// 是否多选
	multiple: Boolean,
	// 限制数量
	limit: Number,
	// 限制大小
	limitSize: Number,
	// 是否自动上传
	autoUpload: {
		type: Boolean,
		default: true
	},
	// 元素大小
	size: [String, Number, Array],
	// 显示图标
	icon: null,
	// 显示文案
	text: String,
	// 是否显示上传列表
	showFileList: {
		type: Boolean,
		default: true
	},
	// 列表是否可拖拽
	draggable: Boolean,
	// 是否拖拽到特定区域以进行上传
	drag: Boolean,
	// 是否禁用
	disabled: Boolean,
	// 是否可删除
	deletable: Boolean,
	// 自定义样式名
	customClass: String,
	// 上传前钩子
	beforeUpload: Function,
	// 云端上传路径前缀
	prefixPath: String,

	// CRUD穿透值
	isEdit: Boolean,
	scope: Object,
	prop: String,
	isDisabled: Boolean
});

const emit = defineEmits(["update:modelValue", "upload", "success", "error", "progress"]);

const { refs, setRefs } = useCool();
const { user } = useBase();
const Form = useForm();
const { options, toUpload } = useUpload();

// 元素尺寸
const size = computed(() => {
	const d = props.size || options.size;
	return (isArray(d) ? d : [d, d]).map((e: string | number) => (isNumber(e) ? e + "px" : e));
});

// 是否禁用
const disabled = computed(() => {
	return props.isDisabled || props.disabled;
});

// 最大上传数量
const limit = props.limit || options.limit.upload;

// 图片大小限制
const limitSize = props.limitSize || options.limit.size;

// 文案
const text = computed(() => {
	if (props.text) {
		return props.text;
	} else {
		switch (props.type) {
			case "file":
				return "选择文件";

			case "image":
				return "选择图片";

			default:
				return "";
		}
	}
});

// 请求头
const headers = computed(() => {
	return {
		Authorization: user.token
	};
});

// 列表
const list = ref<Upload.Item[]>([]);

// 文件格式
const accept = computed(() => {
	return props.accept || (props.type == "file" ? "" : "image/*");
});

// 能否添加
const isAdd = computed(() => {
	let len = list.value.length;

	if (props.multiple && !disabled.value) {
		return limit - len > 0;
	}

	return len == 0;
});

// 上传前
async function onBeforeUpload(file: any, item?: Upload.Item) {
	function next() {
		const d = {
			uid: file.uid,
			size: file.size,
			name: file.name,
			type: getType(file.name),
			progress: props.autoUpload ? 0 : 100, // 非自动上传时默认100%
			url: "",
			preload: "",
			error: ""
		};

		// 图片预览地址
		if (d.type == "image") {
			if (file instanceof File) {
				d.preload = window.webkitURL.createObjectURL(file);
			}
		}

		// 上传事件
		emit("upload", d, file);

		// 赋值
		if (item) {
			Object.assign(item, d);
		} else {
			if (props.multiple) {
				if (!isAdd.value) {
					ElMessage.warning(`最多只能上传${limit}个文件`);
					return false;
				} else {
					list.value.push(d);
				}
			} else {
				list.value = [d];
			}
		}

		return true;
	}

	// 自定义上传事件
	if (props.beforeUpload) {
		let r = props.beforeUpload(file, item, { next });

		if (isPromise(r)) {
			r.then(next).catch(() => null);
		} else {
			if (r) {
				r = next();
			}
		}

		return r;
	} else {
		if (file.size / 1024 / 1024 >= limitSize) {
			ElMessage.error(`上传文件大小不能超过 ${limitSize}MB!`);
			return false;
		}

		return next();
	}
}

// 移除
function remove(index: number) {
	list.value.splice(index, 1);
	update();
}

// 清空
function clear() {
	list.value = [];
}

// 文件上传请求
async function httpRequest(req: any, item?: Upload.Item) {
	if (!item) {
		item = list.value.find((e) => e.uid == req.file.uid);
	}

	if (!item) {
		return false;
	}

	// 上传请求
	toUpload(req.file, {
		prefixPath: props.prefixPath,
		onProgress(progress) {
			item!.progress = progress;
			emit("progress", item);
		}
	})
		.then((res) => {
			Object.assign(item!, res);
			emit("success", item);
			update();
		})
		.catch((err) => {
			item!.error = err.message;
			emit("error", item);
		});
}

// 检测是否还有未上传的文件
function check() {
	return list.value.find((e) => !e.url);
}

// 更新
function update() {
	if (!check()) {
		const urls = getUrls(list.value);

		// 更新绑定值
		emit("update:modelValue", props.multiple ? getUrls(list.value) : urls[0] || "");

		nextTick(() => {
			if (props.prop) {
				Form.value?.validateField(props.prop);
			}

			// 清空
			refs.upload?.clearFiles();
		});
	}
}

// 手动上传
function upload(file: File) {
	clear();

	refs.upload?.clearFiles();

	nextTick(() => {
		refs.upload?.handleStart(file);
		refs.upload?.submit();
	});
}

// 监听绑定值
watch(
	() => props.modelValue,
	(val: any[] | string) => {
		if (check()) {
			return false;
		}

		const urls = (isArray(val) ? val : [val]).filter(Boolean);

		list.value = urls
			.map((url, index) => {
				const old = list.value[index] || {};

				return Object.assign(
					{
						type: getType(url),
						progress: 100,
						uid: uuid()
					},
					old,
					{
						url,
						preload: old.url == url ? old.preload : url // 防止重复预览
					}
				);
			})
			.filter((_, i) => {
				return props.multiple ? true : i == 0;
			});
	},
	{
		immediate: true
	}
);

// 导出
defineExpose({
	isAdd,
	list,
	check,
	clear,
	remove,
	upload
});
</script>

<style lang="scss" scoped>
.cl-upload {
	line-height: normal;

	.Ghost {
		.cl-upload__item {
			border: 1px dashed var(--el-color-primary) !important;
		}
	}

	&__file {
		width: 100%;
	}

	&__list {
		display: flex;
		flex-wrap: wrap;
	}

	&__item,
	&__demo {
		display: flex;
		flex-direction: column;
		align-items: center;
		justify-content: center;
		height: v-bind("size[0]");
		width: v-bind("size[1]");
		background-color: var(--el-fill-color-light);
		color: var(--el-text-color-regular);
		border-radius: 6px;
		cursor: pointer;
		box-sizing: border-box;
		position: relative;
		user-select: none;
	}

	&__item {
		margin: 0 5px 5px 0;
	}

	&__demo {
		font-size: 13px;

		.el-icon {
			font-size: 46px;
			margin-bottom: 5px;
		}

		&.is-dragger {
			padding: 20px;
		}
	}

	:deep(.el-upload) {
		&.is-drag {
			.el-upload-dragger {
				padding: 0;
				border: 0;
				background-color: transparent !important;
				position: relative;
				background-color: red;

				$color: var(--el-color-primary);

				&.is-dragover {
					&::after {
						display: block;
						content: "";
						position: absolute;
						left: 0;
						top: 0;
						height: 100%;
						width: 100%;
						pointer-events: none;
						border-radius: 8px;
						box-sizing: border-box;
						border: 1px dashed var(--color-primary);
					}
				}
			}
		}
	}

	&.is-disabled {
		.cl-upload__demo {
			color: var(--el-text-color-placeholder);
		}

		:deep(.cl-upload__item) {
			cursor: not-allowed;
			background-color: var(--el-disabled-bg-color);
		}
	}

	&:not(.is-disabled) {
		.cl-upload__demo {
			&:hover {
				color: var(--el-color-primary);
			}
		}
	}

	&--file {
		&:not(.is-drag) {
			.cl-upload__list {
				margin-top: 10px;
			}
		}
	}
}
</style>
