<template>
    <div :style="{ width: menuCollapse ? '40px' : props.width }" style='transition: all 0.3s; overflow: hidden;'>
        <Icon v-show='menuCollapse' @click='onMenuCollapse' :name="menuCollapse ? 'el-icon-Expand' : 'el-icon-Fold'"
            :class="menuCollapse ? 'unfold' : ''" size='18' class='fold ml10 mt20 menu-collapse'
            style='cursor: pointer' />
        <div class='cn-tree' :style='{ opacity: menuCollapse ? 0 : 1 }'>
            <div style='display: flex; align-items: center' class='mb10'>
                <el-input maxlength="32" show-word-limit v-model.trim='filterText' placeholder='请输入内容' clearable>
                    <template #prefix>
                        <Icon name='el-icon-Search' style='font-size: 16px' />
                    </template>
                </el-input>
                <!-- <Icon @click='onMenuCollapse' :name="menuCollapse ? 'el-icon-Expand' : 'el-icon-Fold'"
                    :class="menuCollapse ? 'unfold' : ''" size='18' class='fold ml10 menu-collapse'
                    style='cursor: pointer' v-if='props.canExpand' /> -->
            </div>
            <el-tree :style="{ height:  'calc(100vh - 230px)' }"
            style=' overflow: auto;' ref='treeRef' :props='defaultProps' highlight-current :default-expand-all="false"
                @check-change="checkTreeNodeChange" :filter-node-method='filterNode' node-key='id' v-bind='$attrs'>
                <template #default='{ node, data }'>
                    <span class='custom-tree-node'>
                        <Icon :name='data.icon' style='font-size: 16px' :style='{ color: data.color }'
                            v-if='data.icon' />
                        <span style='margin-left: 4px'>{{ node.label }}</span>
                    </span>
                </template>
            </el-tree>
        </div>
    </div>
</template>

<script lang='ts' setup>
import useCurrentInstance from '@/utils/useCurrentInstance'
import { ElTree } from 'element-plus'
import { ref, watch } from 'vue'

defineOptions({
    name: 'govern/tree'
})

interface Props {
    width?: string
    canExpand?: boolean
}

const props = withDefaults(defineProps<Props>(), {
    width: '280px',
    canExpand: true
})
const { proxy } = useCurrentInstance()
const menuCollapse = ref(false)
const filterText = ref('')
const defaultProps = {
    label: 'name',
    value: 'id'
}
const emit = defineEmits(['checkTreeNodeChange'])
watch(filterText, val => {
    treeRef.value!.filter(val)
    
})
const onMenuCollapse = () => {
    menuCollapse.value = !menuCollapse.value
    proxy.eventBus.emit('cnTreeCollapse', menuCollapse)
}
const filterNode = (value: string, data: any, node: any) => {
    if (!value) return true
    // return data.name.includes(value)
    if (data.name) {

        return chooseNode(value, data, node)
    }
}

// 过滤父节点 / 子节点 (如果输入的参数是父节点且能匹配，则返回该节点以及其下的所有子节点；如果参数是子节点，则返回该节点的父节点。name是中文字符，enName是英文字符.
const chooseNode = (value: string, data: any, node: any) => {
    if (data.name.indexOf(value) !== -1) {
        return true
    }
    const level = node.level
    // 如果传入的节点本身就是一级节点就不用校验了
    if (level === 1) {
        return false
    }
    // 先取当前节点的父节点
    let parentData = node.parent
    // 遍历当前节点的父节点
    let index = 0
    while (index < level - 1) {
        // 如果匹配到直接返回，此处name值是中文字符，enName是英文字符。判断匹配中英文过滤
        if (parentData.data.name.indexOf(value) !== -1) {
            return true
        }
        // 否则的话再往上一层做匹配
        parentData = parentData.parent
        index++
    }
    // 没匹配到返回false
    return false
}
const checkTreeNodeChange = () => {
    // console.log(treeRef.value?.getCheckedNodes(), "ikkkkkiisiiisis");
    emit('checkTreeNodeChange', treeRef.value?.getCheckedNodes())
}
const treeRef = ref<InstanceType<typeof ElTree>>()
defineExpose({ treeRef })
</script>

<style lang='scss' scoped>
.cn-tree {
    flex-shrink: 0;
    display: flex;
    flex-direction: column;
    box-sizing: border-box;
    padding: 10px;
    height: 100%;
    width: 100%;

    :deep(.el-tree) {
        border: 1px solid var(--el-border-color);
    }

    :deep(.el-tree--highlight-current .el-tree-node.is-current > .el-tree-node__content) {
        background-color: var(--el-color-primary-light-7);
    }

    .menu-collapse {
        color: var(--el-color-primary);
    }
}

.custom-tree-node {
    display: flex;
    align-items: center;
}
</style>
