<template>
	<view class="cl-tree-item-wrapper" :class="[pt.itemWrapper?.className]">
		<view
			class="cl-tree-item"
			:class="[
				{
					'is-expand': hover,
					'is-dark': isDark,
					'is-checked':
						item.isChecked == true &&
						ClTree?.checkable == true &&
						ClTree?.multiple == false,
					'is-half-checked': item.isHalfChecked,
					'is-disabled': item.disabled,
					'is-multiple': ClTree?.multiple
				},
				pt.item?.className,
				item.isChecked == true ? pt.itemChecked?.className : ''
			]"
			:style="{
				paddingLeft: `${level * 50 + 16}rpx`
			}"
			@touchstart="onTouchStart"
			@touchend="onTouchEnd"
			@touchcancel="onTouchEnd"
		>
			<view class="cl-tree-item__expand" :class="[pt.expand?.className]">
				<cl-icon
					:name="icon"
					:size="pt.expandIcon?.size ?? 34"
					:color="pt.expandIcon?.color"
					:pt="{
						className: pt.expandIcon?.className
					}"
					v-if="hasChildren"
				></cl-icon>
			</view>

			<cl-text
				:pt="{
					className: parseClass(['flex-1 mx-1', pt.label?.className])
				}"
				>{{ item.label }}</cl-text
			>

			<template v-if="showCheckbox">
				<view
					class="cl-tree-item__checkbox"
					:class="[pt.checkbox?.className]"
					@touchstart.stop="toChecked"
				>
					<cl-icon
						v-if="item.isChecked"
						:name="pt.checkedIcon?.name ?? 'checkbox-circle-fill'"
						:size="pt.checkedIcon?.size ?? 38"
						:color="pt.checkedIcon?.color ?? 'primary'"
					></cl-icon>
					<cl-icon
						v-else-if="item.isHalfChecked"
						:name="pt.halfCheckedIcon?.name ?? 'indeterminate-circle-line'"
						:size="pt.halfCheckedIcon?.size ?? 38"
						:color="pt.halfCheckedIcon?.color ?? 'primary'"
					></cl-icon>
					<cl-icon
						v-else
						:name="pt.uncheckedIcon?.name ?? 'checkbox-blank-circle-line'"
						:size="pt.uncheckedIcon?.size ?? 38"
						:color="pt.uncheckedIcon?.color ?? 'info'"
					></cl-icon>
				</view>
			</template>
		</view>

		<template v-if="hasChildren && item.isExpand == true">
			<cl-tree-item
				v-for="item in item.children"
				:key="item.id"
				:item="item"
				:level="level + 1"
				:pt="props.pt"
			></cl-tree-item>
		</template>
	</view>
</template>

<script lang="ts" setup>
import { computed, ref, type PropType } from "vue";
import { isDark, parseClass, parsePt, useParent } from "@/cool";
import type { ClTreeItem, PassThroughProps } from "../../types";
import type { ClIconProps } from "../cl-icon/props";

defineOptions({
	name: "cl-tree-item"
});

const props = defineProps({
	pt: {
		type: Object,
		default: () => ({})
	},
	item: {
		type: Object as PropType<ClTreeItem>,
		default: () => ({})
	},
	level: {
		type: Number,
		default: 0
	}
});

// 透传属性类型定义，支持自定义各部分样式和图标
type PassThrough = {
	item?: PassThroughProps; // 自定义类名
	itemChecked?: PassThroughProps; // 选中状态属性
	itemWrapper?: PassThroughProps; // 外层包裹属性
	expand?: PassThroughProps; // 展开区域属性
	expandIcon?: ClIconProps; // 展开图标属性
	checkbox?: PassThroughProps; // 复选框区域属性
	checkedIcon?: ClIconProps; // 选中图标属性
	halfCheckedIcon?: ClIconProps; // 半选图标属性
	uncheckedIcon?: ClIconProps; // 未选中图标属性
	label?: PassThroughProps; // 标签属性
};

// 解析pt透传属性，便于自定义样式和图标
const pt = computed(() => parsePt<PassThrough>(props.pt));

// 获取父级cl-tree组件实例，用于调用树的相关方法
const ClTree = useParent<ClTreeComponentPublicInstance>("cl-tree");

// 判断当前节点是否有子节点
const hasChildren = computed(() => props.item.children != null && props.item.children.length > 0);

// 判断当前节点是否显示复选框
const showCheckbox = computed(() => {
	if (ClTree == null) {
		return false;
	}

	return ClTree.checkable == true && ClTree.multiple == true;
});

// 计算当前节点应显示的图标（展开/收起）
const icon = computed(() => {
	if (ClTree == null) {
		return "";
	}
	return props.item.isExpand == true ? ClTree.expandIcon : ClTree.icon;
});

// 切换当前节点的展开状态
function toExpand() {
	ClTree!.setExpanded(props.item.id, !(props.item.isExpand ?? false));
}

// 切换当前节点的选中状态
function toChecked() {
	if (props.item.disabled == true) {
		return;
	}

	ClTree!.setChecked(props.item.id, !(props.item.isChecked ?? false));
}

// 控制节点按下时的hover状态
const hover = ref(false);

// 触摸开始时触发，设置hover并展开/收起
function onTouchStart() {
	hover.value = true;
	toExpand();

	if (ClTree != null) {
		if (ClTree.checkable == true && ClTree.multiple != true && props.item.disabled != true) {
			toChecked();
		}
	}
}

// 触摸结束时触发，取消hover
function onTouchEnd() {
	hover.value = false;
}
</script>

<style lang="scss" scoped>
.cl-tree-item {
	@apply flex flex-row items-center w-full rounded-lg;
	padding: 16rpx;

	&__expand {
		@apply w-6 flex items-center justify-center;
	}

	&.is-expand {
		@apply bg-surface-50;

		&.is-dark {
			@apply bg-surface-700;
		}
	}

	&.is-disabled {
		@apply opacity-50;
	}

	&.is-checked {
		@apply bg-primary-100;

		&.is-multiple {
			@apply bg-transparent;
		}

		&.is-dark {
			@apply bg-primary-500;
		}
	}
}
</style>
