<template>
	<view
		ref="node"
		name="LyTreeNode"
		v-show="node.visible"
		class="ly-tree-node"
		:class="{
			'is-expanded': expanded,
			'is-hidden': !node.visible,
			'is-checked': !node.disabled && node.checked
		}"
		role="treeitem"
		@tap.stop="handleClick"
	>
		<view
			class="ly-tree-node__content"
			:class="{
				'is-current': node.isCurrent && highlightCurrent
			}"
			:style="{
				'padding-left': (node.level - 1) * indent + 'px'
			}"
		>
			<text
				@tap.stop="handleExpandIconClick"
				:class="[
					{
						'is-leaf': node.isLeaf,
						expanded: !node.isLeaf && node.expanded
					},
					'ly-tree-node__expand-icon',
					iconClass ? iconClass : 'ly-iconfont ly-icon-caret-right'
				]"
			></text>

			<ly-checkbox
				v-if="checkboxVisible || radioVisible"
				:type="checkboxVisible ? 'checkbox' : 'radio'"
				:checked="node.checked"
				:indeterminate="node.indeterminate"
				:disabled="!!node.disabled"
				@check="handleCheckChange(!node.checked)"
			/>

			<text v-if="node.loading" class="ly-tree-node__loading-icon ly-iconfont ly-icon-loading"></text>

			<template v-if="node.icon && node.icon.length > 0">
				<image v-if="node.icon.indexOf('/') !== -1" class="ly-tree-node__icon" mode="widthFix" :src="node.icon" @error="handleImageError"></image>
				<text v-else class="ly-tree-node__icon" :class="node.icon"></text>
			</template>

			<text class="ly-tree-node__label">{{ node.label }}</text>

			<view class="btn-view">
				<u-icon @click="edit(node)" name="edit-pen-fill" color="#2979ff" size="32" style="margin-right: 30rpx;"></u-icon>
				<u-icon @click="deldata(node)" name="trash" color="#fa3534" size="32"></u-icon>
			</view>
		</view>

		<view v-if="!renderAfterExpand || childNodeRendered" v-show="expanded" class="ly-tree-node__children" role="group">
			<ly-tree-node
				v-for="cNodeId in node.childNodesId"
				:nodeId="cNodeId"
				:render-after-expand="renderAfterExpand"
				:show-checkbox="showCheckbox"
				:show-radio="showRadio"
				:check-only-leaf="checkOnlyLeaf"
				:key="getNodeKey(cNodeId)"
				:indent="indent"
				:icon-class="iconClass"
			></ly-tree-node>
		</view>
	</view>
</template>

<script>
import { getNodeKey } from './tool/util.js';
import lyCheckbox from './components/ly-checkbox.vue';

export default {
	name: 'LyTreeNode',

	componentName: 'LyTreeNode',

	components: {
		lyCheckbox
	},

	props: {
		nodeId: [Number, String],
		renderAfterExpand: {
			type: Boolean,
			default: true
		},
		checkOnlyLeaf: {
			type: Boolean,
			default: false
		},
		showCheckbox: {
			type: Boolean,
			default: false
		},
		showRadio: {
			type: Boolean,
			default: false
		},
		indent: Number,
		iconClass: String
	},

	data() {
		return {
			node: {
				indeterminate: false,
				checked: false,
				expanded: false
			},
			expanded: false,
			childNodeRendered: false,
			oldChecked: null,
			oldIndeterminate: null,
			highlightCurrent: false
		};
	},

	inject: ['tree'],

	computed: {
		checkboxVisible() {
			if (this.checkOnlyLeaf) {
				return this.showCheckbox && this.node.isLeaf;
			}

			return this.showCheckbox;
		},
		radioVisible() {
			if (this.checkOnlyLeaf) {
				return this.showRadio && this.node.isLeaf;
			}

			return this.showRadio;
		}
	},

	watch: {
		'node.indeterminate'(val) {
			this.handleSelectChange(this.node.checked, val);
		},
		'node.checked'(val) {
			this.handleSelectChange(val, this.node.indeterminate);
		},
		'node.expanded'(val) {
			this.$nextTick(() => (this.expanded = val));
			if (val) {
				this.childNodeRendered = true;
			}
		}
	},

	methods: {
		getNodeKey(nodeId) {
			let node = this.tree.store.root.getChildNodes([nodeId])[0];
			return getNodeKey(this.tree.nodeKey, node.data);
		},

		handleSelectChange(checked, indeterminate) {
			if (this.oldChecked !== checked && this.oldIndeterminate !== indeterminate) {
				if (this.checkOnlyLeaf && !this.node.isLeaf) return;

				if (this.checkboxVisible) {
					const allNodes = this.tree.store._getAllNodes();
					this.tree.$emit('check-change', {
						checked,
						indeterminate,
						node: this.node,
						data: this.node.data,
						checkedall: allNodes.every(item => item.checked)
					});
				} else {
					this.tree.$emit('radio-change', {
						checked,
						node: this.node,
						data: this.node.data,
						checkedall: false
					});
				}
			}

			if (!this.expanded && this.tree.expandOnCheckNode && checked) {
				this.handleExpandIconClick();
			}

			this.oldChecked = checked;
			this.indeterminate = indeterminate;
		},

		handleClick() {
			this.tree.store.setCurrentNode(this.node);
			this.tree.$emit('current-change', {
				node: this.node,
				data: this.tree.store.currentNode ? this.tree.store.currentNode.data : null,
				currentNode: this.tree.store.currentNode
			});
			this.tree.currentNode = this.node;

			if (this.tree.expandOnClickNode) {
				this.handleExpandIconClick();
			}

			if (this.tree.checkOnClickNode && !this.node.disabled) {
				(this.checkboxVisible || this.radioVisible) && this.handleCheckChange(!this.node.checked);
			}

			this.tree.$emit('node-click', this.node);
		},

		handleExpandIconClick() {
			if (this.node.isLeaf) return;

			if (this.expanded) {
				this.tree.$emit('node-collapse', this.node);
				this.node.collapse();
			} else {
				this.node.expand();
				this.tree.$emit('node-expand', this.node);

				if (this.tree.accordion) {
					uni.$emit(`${this.tree.elId}-tree-node-expand`, this.node);
				}
			}
		},

		handleCheckChange(checked) {
			if (this.node.disabled) return;

			if (this.checkboxVisible) {
				this.node.setChecked(checked, !(this.tree.checkStrictly || this.checkOnlyLeaf));
			} else {
				this.node.setRadioChecked(checked);
			}

			this.$nextTick(() => {
				this.tree.$emit('check', {
					node: this.node,
					data: this.node.data,
					checkedNodes: this.tree.store.getCheckedNodes(),
					checkedKeys: this.tree.store.getCheckedKeys(),
					halfCheckedNodes: this.tree.store.getHalfCheckedNodes(),
					halfCheckedKeys: this.tree.store.getHalfCheckedKeys()
				});
			});
		},

		handleImageError() {
			this.node.icon = this.tree.defaultNodeIcon;
		},
		edit(node){
			this.tree.$emit('edit',node)
		},
		deldata(node){
			this.tree.$emit('deldata',node)
		}
	},

	created() {
		if (!this.tree) {
			throw new Error("Can not find node's tree.");
		}

		this.node = this.tree.store.nodesMap[this.nodeId];
		this.highlightCurrent = this.tree.highlightCurrent;

		if (this.node.expanded) {
			this.expanded = true;
			this.childNodeRendered = true;
		}

		const props = this.tree.props || {};
		const childrenKey = props['children'] || 'children';
		this.$watch(`node.data.${childrenKey}`, () => {
			this.node.updateChildren();
		});

		if (this.tree.accordion) {
			uni.$on(`${this.tree.elId}-tree-node-expand`, node => {
				if (this.node.id !== node.id && this.node.level === node.level) {
					this.node.collapse();
				}
			});
		}
	},

	beforeDestroy() {
		this.$parent = null;
	},
	
};
</script>

<style lang="scss" scoped>
.ly-tree-node {
	white-space: nowrap;
	outline: 0;
}

.ly-tree-node__content {
	display: flex;
	align-items: center;
	height: 70rpx;
	position: relative;
	.btn-view {
		position: absolute;
		top: 50%;
		transform: translateY(-50%);
		right: 0;
	}
}

.ly-tree-node__content.is-current {
	background-color: #f5f7fa;
}

.ly-tree-node__content > .ly-tree-node__expand-icon {
	padding: 12rpx;
}

.ly-tree-node__checkbox {
	display: flex;
	margin-right: 16rpx;
	width: 40rpx;
	height: 40rpx;
}

.ly-tree-node__checkbox > image {
	width: 40rpx;
	height: 40rpx;
}

.ly-tree-node__expand-icon {
	color: #c0c4cc;
	font-size: 28rpx;
	-webkit-transform: rotate(0);
	transform: rotate(0);
	-webkit-transition: -webkit-transform 0.3s ease-in-out;
	transition: -webkit-transform 0.3s ease-in-out;
	transition: transform 0.3s ease-in-out;
	transition: transform 0.3s ease-in-out, -webkit-transform 0.3s ease-in-out;
}

.ly-tree-node__expand-icon.expanded {
	-webkit-transform: rotate(90deg);
	transform: rotate(90deg);
}

.ly-tree-node__expand-icon.is-leaf {
	color: transparent;
}

.ly-tree-node__icon {
	width: 34rpx;
	height: 34rpx;
	overflow: hidden;
	margin-right: 16rpx;
}

.ly-tree-node__label {
	font-size: 28rpx;
}

.ly-tree-node__loading-icon {
	margin-right: 16rpx;
	font-size: 28rpx;
	color: #c0c4cc;
	-webkit-animation: rotating 2s linear infinite;
	animation: rotating 2s linear infinite;
}

.ly-tree-node > .ly-tree-node__children {
	overflow: hidden;
	background-color: transparent;
}

.ly-tree-node > .ly-tree-node__children.collapse-transition {
	transition: height 0.3s ease-in-out;
}

.ly-tree-node.is-expanded > .ly-tree-node__children {
	display: block;
}

.ly-tree-node_collapse {
	overflow: hidden;
	padding-top: 0;
	padding-bottom: 0;
}
/* lyTree-end */

/* iconfont-start */
@font-face {
	font-family: 'ly-iconfont';
	src: url('data:application/x-font-woff2;charset=utf-8;base64,d09GMgABAAAAAAPsAAsAAAAACKwAAAOeAAEAAAAAAAAAAAAAAAAAAAAAAAAAAAAAHEIGVgCDBgqFDIQPATYCJAMMCwgABCAFhG0HQBtfB8gekiSCdAwUAKgCFMA5Hj7H0PeTlABUr57PVyGqugqzSWJnNwWoWJjx/9rUr4TPL1ZSQpU2mycqwoRwIN3p+MkqMqyEW+OtMBLPSUBb8v//XtWMKTavxYIUsT/Wy1qbQzkBDOYEKGB7dVpPyVqgCnJNwvMvhZl10nMCtQbFoPVhY8ZDncJfF4grbqpQ13AqE52hWqgcOFrEQ6hWnW5VfMCD7Pfjn4WoI6nI/K0bl0MNGPBz0qcflVqYnvCA4vNDPUXGPFCIw8HgtsqiOK9SrW2smm6sVITElWlpISMdVBn8wyMJopLfXg+myZ48KCrSkvj9g37U1ItbXYke4APwXxK3N4TuehyBfmM0I3zbNdt7uk3VnjPtzX0rnIl7z7bZvb/thHohsu9QuykKo+Cws4nL7LsPmI3n2qN9B9upZEIKd4hu0NCKi0rt7fNtdl+I1N25hOJMDQK6odS123tROR7Pg8toEhDaF+kR0TYjxW6M58F5+ZNQOxmZHtE2g+IYjxjlNy/yIRQpCmrgq5R4/3jx8PvT8Ha8d3/xiLnt4EGyaDnznzRv8vpyZ+9TFHf/ntX9e59A+b6+fPHd5+dy0wYHVvHOroWbnWe879O9DnL53bN/gUHuwm28b/n8i/V3ry4E3IoXNqS6Rvs0LhJxeNVjoUkM3LKosU+0a6rh45FVvLt+2oz7Zd53b4QOy7/9snDXHbqVu+A+f8r7PnM2H8kXrWm5c8/vLu7LqRee7HW637mz3kHc5U/RCXf25d7G8tkdgEfwIpzpkknGpaMw3ww55q9Mn9OQNyua/wB/49OOWydn4eL/6roCfjx6FMmcxfJStYRKfd3UwoHiML4rF4uMSK+SvYTuNxMHrpl8yd3Q6v32cAeo/KFaowBJlQHIqo3zi3geKtRZhErVlqDWnOGn67QRKkWpwaw1AkKza5A0egFZszf8In4HFTp9h0rNUQm1NqP1lXUmgyuDBVUlNYi2gHA98FnokUreOZaac1xV1JlMMZGKEs+QdCLVrgynPhUcO0pzzYyUjDAReGSYeBl13YCEIrCpLhOWlGE+mWRD35TQAw8UawRKJVEGQrMAwekCPpaMlpTOz49FmeZwqcREX1t3Ikoo4dMTaQmpBfzhRn9R30uZXTKXKUOSmLSKEQIeYhjqKZcrcIzhMLLRrJMSrA35UF4yGMaWGhPHm733dwJq+Z/NkSJHUXemCirjgpuWrHMD1eC+mQUAAAA=')
		format('woff2');
}

.ly-iconfont {
	font-family: 'ly-iconfont' !important;
	font-size: 30rpx;
	font-style: normal;
	-webkit-font-smoothing: antialiased;
	-moz-osx-font-smoothing: grayscale;
}

.ly-icon-caret-right:before {
	content: '\e8ee';
}

.ly-icon-loading:before {
	content: '\e657';
}
/* iconfont-end */

/* animate-start */
@keyframes rotating {
	0% {
		-webkit-transform: rotateZ(0);
		transform: rotateZ(0);
	}

	100% {
		-webkit-transform: rotateZ(360deg);
		transform: rotateZ(360deg);
	}
}
/* animate-end */
</style>
