<!-- components/FormItemRecursive.vue -->
<template>
  <div class="form-item-recursive">
    <!-- 循环渲染当前层级的所有表单项 -->
    <div v-for="(item, index) in currentList" :key="index">
      <el-row>
        <!-- 名称输入 -->
        <el-form-item
          :label="isFirstLevel && index === 0 ? '变量名' : ''"
          :prop="`${propPath}.${index}.name`"
          :rules="[{ required: true, message: '请输入', trigger: 'blur' }]"
        >
          <el-input
            class="param-name"
            v-model="item.name"
            placeholder="请输入"
            clearable
          />
        </el-form-item>

        <!-- 类型选择 -->
        <el-form-item
          :label="isFirstLevel && index === 0 ? '变量类型' : ''"
          :prop="`${propPath}.${index}.type`"
          :rules="[{ required: true, message: '请输入', trigger: 'blur' }]"
        >
          <el-select
            v-model="item.type"
            class="param-type"
            @change="handleTypeChange(item)"
          >
            <el-option label="String" value="string" />
            <el-option label="Number" value="number" />
            <el-option label="Boolean" value="boolean" />
            <el-option v-if="depth < endDepth" label="Object" value="object" />
            <el-option label="Array<String>" value="array<string>" />
            <el-option label="Array<Number>" value="array<number>" />
            <el-option label="Array<Boolean>" value="array<boolean>" />
            <el-option v-if="depth < endDepth" label="Array<Object>" value="array<object>" />
          </el-select>
        </el-form-item>

        <!-- 描述输入 -->
        <el-form-item
          :label="isFirstLevel && index === 0 ? '描述' : ''"
          :prop="`${propPath}.${index}.desc`"
          :rules="[{ required: true, message: '请输入', trigger: 'blur' }]"
        >
          <el-input
            class="param-desc"
            v-model="item.desc"
            placeholder="请输入"
            clearable
          />
        </el-form-item>

        <!-- 是否必填 -->
        <el-form-item v-if="formType === 'input'" :label="isFirstLevel && index === 0 ? '必填' : ''">
          <el-switch
            v-model="item.required"
          />
        </el-form-item>

        <!-- 删除按钮（第一层第一个不能删） -->
        <el-button
          :icon="Minus"
          circle
          size="small"
          @click="handleDelete(index)"
          class="deleteBtn"
        />

        <!-- 添加子项按钮（当类型是object/array<object>时） -->
        <el-button
          v-if="['object', 'array<object>'].includes(item.type)"
          :icon="Plus"
          circle
          size="small"
          @click="handleAddChild(item)"
          class="addBtn"
        />
      </el-row>

      <!-- 递归渲染子项（如果有子项且类型匹配） -->
      <!-- 层级越深，缩进越多 -->
      <div
        v-if="['object', 'array<object>'].includes(item.type) && item.children.length"
        class="nested-form-items"
        :style="{ marginLeft: `${depth * 20}px` }"
      >
        <!-- 递归调用自身，处理下一层级 -->
        <!-- 非第一层 -->
        <!-- 复用添加逻辑 -->
        <FormItemRecursive
          :formType="formType"
          :current-list="item.children"
          :prop-path="`${propPath}.${index}.children`"
          :depth="depth + 1"
          :is-first-level="false"
          :endDepth="endDepth"
          :parent-path="[...parentPath, index] "
          @add-item="handleAddChild(item)"
          @delete-item="handleChildDelete"
        />
      </div>
    </div>
  </div>
</template>

<script setup>
import { Plus, Minus } from "@element-plus/icons-vue";

// 定义props
const { formType, currentList, propPath, depth, isFirstLevel, endDepth, parentPath } = defineProps({
  formType: {
    type: String,
    default: 'input'
  },
  currentList: {
    type: Array,
    default: () => []
  },
  propPath: {
    type: String,
    default: ''
  },
  depth: {
    type: Number,
    default: 0
  },
  isFirstLevel: {
    type: Boolean,
    default: true
  },
  endDepth: {
    type: Number,
    default: 2
  },
  parentPath: {
    type: Array,
    default: () => []
  },
});

// 定义emit事件
const emit = defineEmits(['add-item', 'delete-item'])

// 处理类型变化（清空或添加子项）
const handleTypeChange = (item) => {
  if (!["object", "array<object>"].includes(item.type)) {
    item.children = []; // 非对象类型清空子项
  } else if (item.children.length === 0) {
    handleAddChild(item); // 首次切换为对象类型时添加一个子项
  }
};

// 添加子项
const handleAddChild = (parentItem) => {
  parentItem.children.push({
    name: "",
    type: "string",
    desc: "",
    required: false,
    children: [],
  });
  // emit("add-item", parentItem); // 通知父组件（可选）
};

// 删除当前项
const handleDelete = (index) => {
  // 完整路径 = 父级路径 + 当前索引（如果是顶层，parentPath为undefined）
  const fullPath = parentPath ? [...parentPath, index] : [index];
  emit("delete-item", fullPath); // 向上传递完整路径
}

// 接收子组件的删除事件，继续向上传递
const handleChildDelete = (childFullPath) => {
  emit("delete-item", childFullPath);
}
</script>

<style lang="scss" scoped>
.nested-form-items {
  border-left: 1px dashed #ccc; /* 层级连接线 */
  padding-left: 12px;
  margin-left: 0 !important;
  margin-top: 8px;
  margin-bottom: 8px;
}

.deleteBtn {
  margin-bottom: 22px;
  cursor: pointer;
}

.addBtn {
  margin-bottom: 22px;
  cursor: pointer;
}

:deep(.el-row) {
  align-items: end;

  .el-form-item {
    margin-right: 12px;
  }
  
  .param-name {
    width: 120px;
  }

  .param-type {
    width: 80px;
  }

  .param-desc {
    width: 120px;
  }

}
</style>
