<?php

namespace App\Http\Controllers\Admin\System;

use App\Http\Controllers\Controller;
use App\Models\Department;
use Illuminate\Http\JsonResponse;
use Illuminate\Http\Request;

class DepartmentController extends Controller
{
    /**
     * 部门树
     */
    public function index(): JsonResponse
    {
        $departments = Department::orderBy('sort')->get()->toArray();
        $tree = $this->buildTree($departments);
        return $this->success($tree);
    }

    public function store(Request $request): JsonResponse
    {
        $data = $request->validate([
            'parent_id' => 'nullable|integer',
            'name' => 'required|string|max:50',
            'sort' => 'nullable|integer',
            'status' => 'in:0,1',
        ]);

        $data['parent_id'] = $data['parent_id'] ?? 0;
        $data['sort'] = $data['sort'] ?? 0;
        $data['store_id'] = $data['store_id'] ?? auth()->user()->store_id;
        $department = Department::create($data);
        return $this->success($department, '创建成功');
    }

    public function update(Request $request, Department $department): JsonResponse
    {
        $data = $request->validate([
            'parent_id' => 'nullable|integer',
            'name' => 'string|max:50',
            'sort' => 'nullable|integer',
            'status' => 'in:0,1',
        ]);

        // 不能设自己为上级
        if (isset($data['parent_id']) && $data['parent_id'] == $department->id) {
            return $this->error('不能设置自身为上级部门');
        }

        $department->update($data);
        return $this->success($department, '更新成功');
    }

    public function destroy(Department $department): JsonResponse
    {
        if ($department->children()->exists()) {
            return $this->error('该部门下还有子部门，无法删除');
        }
        if ($department->users()->exists()) {
            return $this->error('该部门下还有员工，无法删除');
        }
        $department->delete();
        return $this->success(null, '删除成功');
    }

    private function buildTree(array $items, int $parentId = 0): array
    {
        $tree = [];
        foreach ($items as $item) {
            if ($item['parent_id'] == $parentId) {
                $children = $this->buildTree($items, $item['id']);
                if ($children) {
                    $item['children'] = $children;
                }
                $tree[] = $item;
            }
        }
        return $tree;
    }
}
