<template>
	<div class="form-table" ref="scFormTable">
		<el-table
			:data="data"
			ref="table"
			border
			stripe
			:cell-style="{ textAlign: 'center' }"
			:header-cell-style="{
				textAlign: 'center',
				background: 'var(--el-table-row-hover-bg-color)',
				color: 'var(--el-text-color-primary)',
			}"
		>
			<el-table-column type="index" width="50" fixed="left">
				<template #header>
					<el-button v-if="!hideAdd" type="primary" icon="el-icon-plus" size="small" circle @click="rowAdd"></el-button>
					<el-tooltip v-else content="序号" placement="top"> # </el-tooltip>
				</template>
				<template #default="scope">
					<div :class="['form-table-handle', { 'form-table-handle-delete': !hideDelete }]">
						<span>{{ scope.$index + 1 }}</span>
						<el-button
							v-if="!hideDelete"
							type="danger"
							icon="el-icon-delete"
							size="small"
							plain
							circle
							@click="rowDel(scope.row, scope.$index)"
						></el-button>
					</div>
				</template>
			</el-table-column>
			<el-table-column label="" width="50" v-if="dragSort">
				<template #header>
					<el-icon>
						<el-tooltip content="拖动排序" placement="top">
							<WarningFilled />
						</el-tooltip>
					</el-icon>
				</template>
				<template #default>
					<div class="move" style="cursor: move">
						<el-icon>
							<Sort />
						</el-icon>
					</div>
				</template>
			</el-table-column>
			<slot></slot>
			<template #empty>
				{{ placeholder }}
			</template>
		</el-table>
	</div>
</template>

<script>
import Sortable from 'sortablejs';

export default {
	props: {
		/**
		 * 表格数据
		 */
		modelValue: { type: Array, default: () => [] },
		/**
		 * 新增行模板
		 */
		addTemplate: { type: Object, default: () => {} },
		/**
		 * 无数据时的提示语
		 */
		placeholder: { type: String, default: '暂无数据' },
		/**
		 * 是否启用拖拽排序
		 */
		dragSort: { type: Boolean, default: false },
		/**
		 * 是否隐藏新增按钮
		 */
		hideAdd: { type: Boolean, default: false },
		/**
		 * 是否隐藏删除按钮
		 */
		hideDelete: { type: Boolean, default: false },
	},
	data() {
		return {
			/**
			 * 表格数据
			 */
			data: [],
		};
	},
	mounted() {
		this.data = this.modelValue;
		if (this.dragSort) {
			this.rowDrop();
		}
	},
	watch: {
		modelValue() {
			this.data = this.modelValue;
		},
		data: {
			handler() {
				/**
				 * 更新表格数据
				 * @event update:modelValue
				 * @type {Array}
				 */
				this.$emit('update:modelValue', this.data);
			},
			deep: true,
		},
	},
	methods: {
		/**
		 * 启用表格行拖拽排序
		 */
		rowDrop() {
			const _this = this;
			const tbody = this.$refs.table.$el.querySelector('.el-table__body-wrapper tbody');
			Sortable.create(tbody, {
				handle: '.move',
				animation: 300,
				ghostClass: 'ghost',
				onEnd({ newIndex, oldIndex }) {
					_this.data.splice(newIndex, 0, _this.data.splice(oldIndex, 1)[0]);
					const newArray = _this.data.slice(0);
					const tmpHeight = _this.$refs.scFormTable.offsetHeight;
					_this.$refs.scFormTable.style.setProperty('height', tmpHeight + 'px');
					_this.data = [];
					_this.$nextTick(() => {
						_this.data = newArray;
						_this.$nextTick(() => {
							_this.$refs.scFormTable.style.removeProperty('height');
						});
					});
				},
			});
		},
		/**
		 * 新增一行
		 */
		rowAdd() {
			const temp = JSON.parse(JSON.stringify(this.addTemplate));
			this.data.push(temp);
		},
		/**
		 * 删除一行
		 * @param {Object} row - 要删除的行数据
		 * @param {number} index - 要删除的行的索引
		 */
		rowDel(row, index) {
			this.data.splice(index, 1);
			this.$emit('delete', row);
		},
		/**
		 * 插入一行
		 * @param {Object} row - 要插入的行数据，默认为新增行模板
		 */
		pushRow(row) {
			const temp = row || JSON.parse(JSON.stringify(this.addTemplate));
			this.data.push(temp);
		},
		/**
		 * 根据索引删除一行
		 * @param {number} index - 要删除的行的索引
		 */
		deleteRow(index) {
			this.data.splice(index, 1);
		},
	},
};
</script>

<style scoped>
.form-table {
	width: 100%;
}

.form-table .form-table-handle {
	text-align: center;
}

.form-table .form-table-handle span {
	display: inline-block;
}

.form-table .form-table-handle button {
	display: none;
}

.form-table .hover-row .form-table-handle-delete span {
	display: none;
}

.form-table .hover-row .form-table-handle-delete button {
	display: inline-block;
}

.form-table .move {
	text-align: center;
	font-size: 14px;
	margin-top: 3px;
}
</style>