<?php

namespace App\Http\Controllers\API\Admin;

use App\Http\Controllers\Controller;
use App\Lib\Rs;
use Illuminate\Http\Request;
use Illuminate\Support\Facades\DB;

class BodyPartController extends Controller
{
    /**
     * 获取部位列表（树形结构）
     */
    public function list(Request $request)
    {
        $name = $request->input('name', '');
        $status = $request->input('status', null);

        $query = DB::table('exam_body_part')
            ->where('deleted', 0);

        if (!empty($name)) {
            $query->where('name', 'like', '%' . $name . '%');
        }

        if ($status !== null) {
            $query->where('status', $status);
        }

        $allParts = $query->orderBy('sort_order', 'asc')
            ->orderBy('id', 'asc')
            ->get();

        // 构建树形结构
        $tree = [];
        $childrenMap = [];

        foreach ($allParts as $part) {
            if ($part->parent_id === null) {
                $tree[] = $part;
            } else {
                if (!isset($childrenMap[$part->parent_id])) {
                    $childrenMap[$part->parent_id] = [];
                }
                $childrenMap[$part->parent_id][] = $part;
            }
        }

        foreach ($tree as &$parent) {
            $parent->children = $childrenMap[$parent->id] ?? [];
        }

        return Rs::success($tree);
    }

    /**
     * 获取所有启用部位（平铺列表，用于下拉选择）
     */
    public function getAll()
    {
        $list = DB::table('exam_body_part')
            ->where('deleted', 0)
            ->where('status', 1)
            ->orderBy('sort_order', 'asc')
            ->orderBy('id', 'asc')
            ->get();

        return Rs::success($list);
    }

    /**
     * 新增/编辑部位
     */
    public function save(Request $request)
    {
        $data = $request->validate([
            'id' => 'required|integer',
            'code' => 'required|string|max:20',
            'name' => 'required|string|max:100',
            'parent_id' => 'nullable|integer',
            'sort_order' => 'nullable|integer',
            'status' => 'required|integer|in:0,1',
        ]);

        // 检查编码唯一性
        $exists = DB::table('exam_body_part')
            ->where('code', $data['code'])
            ->where('id', '!=', $data['id'])
            ->where('deleted', 0)
            ->exists();

        if ($exists) {
            return Rs::error('部位编码已存在');
        }

        $conditions = ['id' => $data['id']];
        $values = [
            'code' => $data['code'],
            'name' => $data['name'],
            'parent_id' => $data['parent_id'] ?? null,
            'sort_order' => $data['sort_order'] ?? 0,
            'status' => $data['status'],
        ];

        DB::table('exam_body_part')->updateOrInsert($conditions, $values);

        return Rs::success();
    }

    /**
     * 删除部位
     */
    public function delete(Request $request)
    {
        $data = $request->validate([
            'id' => 'required|integer',
        ]);

        // 检查是否有子部位
        $hasChildren = DB::table('exam_body_part')
            ->where('parent_id', $data['id'])
            ->where('deleted', 0)
            ->exists();

        if ($hasChildren) {
            return Rs::error('该部位下存在子部位，无法删除');
        }

        // 检查是否有项目关联
        $hasItems = DB::table('exam_item_body_part')
            ->where('body_part_id', $data['id'])
            ->exists();

        if ($hasItems) {
            return Rs::error('该部位已被检查项目关联，无法删除');
        }

        DB::table('exam_body_part')->where('id', $data['id'])->update(['deleted' => 1]);

        return Rs::success();
    }
}