<?php

namespace app\admin\controller;

use think\facade\View;
use think\facade\Db;
use app\common\model\FFCategories;

class FFCategoriesController extends Base
{
    /**
     * 商品分类列表
     */
    public function index()
    {
        if (request()->isAjax()) {
            $limit = input('param.limit', 15);
            $page = input('param.page', 1);
            $offset = ($page - 1) * $limit;
            $category_name = input('param.category_name', '');
            $status = input('param.status', '');

            $where = [];
            if ($category_name) {
                $where[] = ['category_name', 'like', "%{$category_name}%"];
            }
            if ($status !== '') {
                $where[] = ['status', '=', $status];
            }

            $res = FFCategories::where($where)
                ->order(['sort_order' => 'asc', 'id' => 'desc'])
                ->limit($offset, $limit)
                ->select();

            $total = FFCategories::where($where)->count();

            return $this->renderTable('获取成功', $total, $res, 0);
        }

        return View::fetch('FFCategories/index');
    }

    /**
     * 添加商品分类
     */
    public function add()
    {
        if (request()->isPost()) {
            $param = input('post.');
            $validate = $this->validate($param, [
                'category_name' => 'require',
            ]);

            if (true !== $validate) {
                return $this->renderError($validate);
            }

            // 默认值设置
            if (!isset($param['parent_id'])) {
                $param['parent_id'] = 0;
                $param['category_level'] = 1;
            } else if ($param['parent_id'] > 0) {
                // 查询父级分类的等级，并设置当前分类的等级为父级+1
                $parent = FFCategories::where('id', $param['parent_id'])->find();
                if (!$parent) {
                    return $this->renderError('父级分类不存在');
                }
                $param['category_level'] = $parent['category_level'] + 1;
                // 分类最多支持3级
                if ($param['category_level'] > 3) {
                    return $this->renderError('分类最多支持3级');
                }
            }
            
            if (!isset($param['sort_order'])) {
                $param['sort_order'] = 0;
            }
            if (!isset($param['status'])) {
                $param['status'] = 1;
            }

            $res = FFCategories::create($param);
            if ($res) {
                return $this->renderSuccess('添加成功', ['url' => (string) url('ff_products')]);
            } else {
                return $this->renderError('添加失败');
            }
        }

        // 获取父级分类列表
        $parentList = FFCategories::where([
                ['category_level', '<', 3], // 只查询1级和2级分类作为父级
                ['status', '=', 1]
            ])
            ->order('sort_order', 'asc')
            ->select();
        View::assign('parentList', $parentList);
        
        return View::fetch('FFCategories/add');
    }

    /**
     * 编辑商品分类
     */
    public function edit()
    {
        $id = input('param.id', 0);
        $info = FFCategories::where('id', $id)->find();
        if (empty($info)) {
            return $this->renderError('数据不存在');
        }

        if (request()->isPost()) {
            $param = input('post.');
            $validate = $this->validate($param, [
                'category_name' => 'require',
            ]);

            if (true !== $validate) {
                return $this->renderError($validate);
            }

            // 不允许修改分类级别和父级分类，因为会影响分类结构
            unset($param['parent_id']);
            unset($param['category_level']);

            $res = FFCategories::update($param, ['id' => $id]);
            if ($res) {
                return $this->renderSuccess('编辑成功', ['url' => (string) url('ff_products')]);
            } else {
                return $this->renderError('编辑失败');
            }
        }

        View::assign('info', $info);
        return View::fetch('FFCategories/edit');
    }

    /**
     * 修改分类状态
     */
    public function status()
    {
        $id = input('param.id', 0);
        $status = input('param.status', 0);

        $res = FFCategories::update(['status' => $status], ['id' => $id]);
        if ($res) {
            return $this->renderSuccess('操作成功');
        } else {
            return $this->renderError('操作失败');
        }
    }

    /**
     * 删除分类
     */
    public function del()
    {
        $id = input('param.id', 0);
        
        // 检查是否有子分类
        $hasChildren = FFCategories::where('parent_id', $id)->count();
        if ($hasChildren > 0) {
            return $this->renderError('该分类下有子分类，无法删除');
        }
        
        $res = FFCategories::destroy($id);
        if ($res) {
            return $this->renderSuccess('删除成功');
        } else {
            return $this->renderError('删除失败');
        }
    }
 
    
 
}