<template>
	<view class="uni-data-pickerview">
		<scroll-view class="selected-area" scroll-x="true" scroll-y="false" :show-scrollbar="false">
			<view class="selected-list">
				<template v-for="(item,index) in selected">
					<view class="selected-item"
						:class="{'selected-item-active':index==selectedIndex, 'selected-item-text-overflow': ellipsis}"
						 v-if="item.text" @click="handleSelect(index)">
						<text class="">{{item.text}}</text>
					</view>
				</template>
			</view>
		</scroll-view>
		<view class="tab-c">
			<template v-for="(child, i) in dataList" >
				<scroll-view class="list" :key="i" v-if="i==selectedIndex" :scroll-y="true">
					<view class="item" :class="{'is-disabled': !!item.disable}" v-for="(item, j) in child"
						@click="handleNodeClick(item, i, j)">
						<text class="item-text item-text-overflow">{{item[map.text]}}</text>
						<view class="check" v-if="selected.length > i && item[map.value] == selected[i].value"></view>
					</view>
				</scroll-view>
			</template>

			<view class="loading-cover" v-if="loading">
				<uni-load-more class="load-more" :contentText="loadMore" status="loading"></uni-load-more>
			</view>
			<view class="error-message" v-if="errorMessage">
				<text class="error-text">{{errorMessage}}</text>
			</view>
		</view>
	</view>
</template>

<script>
	import dataPicker from "./uni-data-picker.js"

	/**
	 * DataPickerview
	 * @description uni-data-pickerview
	 * @tutorial https://ext.dcloud.net.cn/plugin?id=3796
	 * @property {Array} localdata 本地数据，参考
	 * @property {Boolean} step-searh = [true|false] 是否分布查询
	 * @value true 启用分布查询，仅查询当前选中节点
	 * @value false 关闭分布查询，一次查询出所有数据
	 * @property {String|DBFieldString} self-field 分布查询当前字段名称
	 * @property {String|DBFieldString} parent-field 分布查询父字段名称
	 * @property {String|DBCollectionString} collection 表名
	 * @property {String|DBFieldString} field 查询字段，多个字段用 `,` 分割
	 * @property {String} orderby 排序字段及正序倒叙设置
	 * @property {String|JQLString} where 查询条件
	 */
	export default {
		name: 'UniDataPickerView',
		emits: ['nodeclick', 'change', 'datachange', 'update:modelValue'],
		mixins: [dataPicker],
		props: {
			managedMode: {
				type: Boolean,
				default: false
			},
			ellipsis: {
				type: Boolean,
				default: true
			}
		},
		data() {
			return {}
		},
		created() {
			if (this.managedMode) {
				return
			}

			this.$nextTick(() => {
				this.load()
			})
		},
		methods: {
			onPropsChange() {
				this._treeData = []
				this.selectedIndex = 0
				this.load()
			},
			load() {
				if (this.isLocaldata) {
					this.loadData()
				} else if (this.dataValue.length) {
					this.getTreePath((res) => {
						this.loadData()
					})
				}
			},
			handleSelect(index) {
				this.selectedIndex = index
			},
			handleNodeClick(item, i, j) {
				if (item.disable) {
					return
				}
				const node = this.dataList[i][j]
				const text = node[this.map.text]
				const value = node[this.map.value]
				if (i < this.selected.length - 1) {
					this.selected.splice(i, this.selected.length - i)
					this.selected.push({
						text,
						value
					})
				} else if (i === this.selected.length - 1) {
					this.selected.splice(i, 1, {
						text,
						value
					})
				}

				if (node.isleaf) {
					this.onSelectedChange(node, node.isleaf)
					return
				}

				const {
					isleaf,
					hasNodes
				} = this._updateBindData()

				if (!this._isTreeView() && !hasNodes) {
					this.onSelectedChange(node, true)
					return
				}

				if (this.isLocaldata && (!hasNodes || isleaf)) {
					this.onSelectedChange(node, true)
					return
				}

				if (!isleaf && !hasNodes) {
					this._loadNodeData((data) => {
						if (!data.length) {
							node.isleaf = true
						} else {
							this._treeData.push(...data)
							this._updateBindData(node)
						}
						this.onSelectedChange(node, node.isleaf)
					}, this._nodeWhere())
					return
				}

				this.onSelectedChange(node, false)
			},
			updateData(data) {
				this._treeData = data.treeData
				this.selected = data.selected
				if (!this._treeData.length) {
					this.loadData()
				} else {
					//this.selected = data.selected
					this._updateBindData()
				}
			},
			onDataChange() {
				this.$emit('datachange')
			},
			onSelectedChange(node, isleaf) {
				if (isleaf) {
					this._dispatchEvent()
				}

				if (node) {
					this.$emit('nodeclick', node)
				}
			},
			_dispatchEvent() {
				this.$emit('change', this.selected.slice(0))
			}
		}
	}
</script>
<style lang="scss">
	$uni-primary: #007aff !default;

	.uni-data-pickerview {
		flex: 1;
		/* #ifndef APP-NVUE */
		display: flex;
		/* #endif */
		flex-direction: column;
		overflow: hidden;
		height: 100%;
	}

	.error-text {
		color: #DD524D;
	}

	.loading-cover {
		position: absolute;
		left: 0;
		top: 0;
		right: 0;
		bottom: 0;
		background-color: rgba(255, 255, 255, .5);
		/* #ifndef APP-NVUE */
		display: flex;
		/* #endif */
		flex-direction: column;
		align-items: center;
		z-index: 1001;
	}

	.load-more {
		/* #ifndef APP-NVUE */
		margin: auto;
		/* #endif */
	}

	.error-message {
		background-color: #fff;
		position: absolute;
		left: 0;
		top: 0;
		right: 0;
		bottom: 0;
		padding: 15px;
		opacity: .9;
		z-index: 102;
	}

	/* #ifdef APP-NVUE */
	.selected-area {
		width: 750rpx;
	}

	/* #endif */

	.selected-list {
		/* #ifndef APP-NVUE */
		display: flex;
		/* #endif */
		flex-direction: row;
		flex-wrap: nowrap;
		padding: 0 5px;
		border-bottom: 1px solid #f8f8f8;
	}

	.selected-item {
		margin-left: 10px;
		margin-right: 10px;
		padding: 12px 0;
		text-align: center;
		/* #ifndef APP-NVUE */
		white-space: nowrap;
		/* #endif */
	}

	.selected-item-text-overflow {
		width: 168px;
		/* fix nvue */
		overflow: hidden;
		/* #ifndef APP-NVUE */
		width: 6em;
		white-space: nowrap;
		text-overflow: ellipsis;
		-o-text-overflow: ellipsis;
		/* #endif */
	}

	.selected-item-active {
		border-bottom: 2px solid $uni-primary;
	}

	.selected-item-text {
		color: $uni-primary;
	}

	.tab-c {
		position: relative;
		flex: 1;
		/* #ifndef APP-NVUE */
		display: flex;
		/* #endif */
		flex-direction: row;
		overflow: hidden;
	}

	.list {
		flex: 1;
	}

	.item {
		padding: 12px 15px;
		/* border-bottom: 1px solid #f0f0f0; */
		/* #ifndef APP-NVUE */
		display: flex;
		/* #endif */
		flex-direction: row;
		justify-content: space-between;
	}

	.is-disabled {
		opacity: .5;
	}

	.item-text {
		/* flex: 1; */
		color: #333333;
	}

	.item-text-overflow {
		width: 280px;
		/* fix nvue */
		overflow: hidden;
		/* #ifndef APP-NVUE */
		width: 20em;
		white-space: nowrap;
		text-overflow: ellipsis;
		-o-text-overflow: ellipsis;
		/* #endif */
	}

	.check {
		margin-right: 5px;
		border: 2px solid $uni-primary;
		border-left: 0;
		border-top: 0;
		height: 12px;
		width: 6px;
		transform-origin: center;
		/* #ifndef APP-NVUE */
		transition: all 0.3s;
		/* #endif */
		transform: rotate(45deg);
	}
</style>
