<?php
// +----------------------------------------------------------------------
// | YwxApp [ WE CAN DO IT JUST THINK ]
// +----------------------------------------------------------------------
// | Copyright (c) 2026-2036 http://ywxapp.cn All rights reserved.
// +----------------------------------------------------------------------
// | Author: ywxapp<admin@ywxapp.cn>
// +----------------------------------------------------------------------
declare (strict_types = 1);

namespace addon\blog\controller\backend;

use addon\blog\model\BlogCategory as CategoryModel;
use think\facade\Request;
use think\facade\View;
use think\Validate;
use ywxapp\controller\BackendBase;

/**
 * Category 类
 *
 * @author ywxapp <admin@ywxapp.cn>
 */
class Category extends BackendBase
{

    protected $noNeedVerify = ['*'];

    
    protected function initialize()
    {}

    /**
     * 分类列表（后台管理全部分类：全局共享 + 各会员自建）
     * 以 layui treeTable 所需的扁平结构返回（带 pid / is_parent），由前端 treeTable 自动成树。
     */
    public function index()
    {
        $categories = CategoryModel::withCount('articles')
            ->order('uid', 'asc')
            ->order('sort', 'asc')
            ->select()
            ->toArray();

        // 收集归属会员昵称
        $uids = [];
        foreach ($categories as $c) {
            if (!empty($c['uid'])) {
                $uids[] = $c['uid'];
            }
        }
        $owners = [];
        if ($uids) {
            $owners = \think\facade\Db::name('member')
                ->whereIn('uid', array_unique($uids))
                ->column('nickname', 'uid');
        }

        // 计算哪些分类拥有子分类（用于 treeTable 的 is_parent 标记）
        $parentIds = array_unique(array_filter(array_column($categories, 'pid')));

        $treeData = [];
        foreach ($categories as $c) {
            $treeData[] = [
                'id'             => $c['id'],
                'pid'            => $c['pid'],
                'title'          => $c['name'],                 // treeTable 节点显示名称
                'name'           => $c['name'],
                'description'    => $c['description'] ?? '',
                'sort'           => $c['sort'],
                'status'         => $c['status'],
                'is_parent'      => in_array($c['id'], $parentIds, true) ? 1 : 0,
                'owner'          => empty($c['uid']) ? '全局共享' : ($owners[$c['uid']] ?? ('#' . $c['uid'])),
                'articles_count' => $c['articles_count'] ?? 0,
            ];
        }

        return View::fetch('category/index', [
            'treeData' => json_encode($treeData, JSON_UNESCAPED_UNICODE | JSON_HEX_TAG),
        ]);
    }

    /**
     * 添加分类页面
     */
    public function add()
    {
        $categories = CategoryModel::order('sort', 'asc')->select();
        return View::fetch('category/add', ['categories' => $categories]);
    }

    /**
     * 保存分类
     */
    public function save()
    {
        $data              = Request::post();
        $data['uid']       = 0; // 后台管理的分类为全局共享分类
        $data['pid']       = (int) Request::post('pid', 0);
        $data['create_at'] = time();
        $data['update_at'] = time();

        $validate = new Validate([
            'name|分类名称' => 'require|unique:BlogCategory,name,0,id,uid,0',
            'pid|上级分类' => 'number',
            'sort|排序'   => 'number|between:0,999',
        ]);

        if (! $validate->check($data)) {
            return json(['code' => 0, 'msg' => $validate->getError()]);
        }

        CategoryModel::create($data);
        return json(['code' => 1, 'msg' => '分类添加成功', 'url' => '/blog/backend/category']);
    }

    /**
     * 编辑分类页面
     */
    public function edit($id = null)
    {
        $category = CategoryModel::find($id);
        $categories = CategoryModel::order('sort', 'asc')->select();
        return View::fetch('category/edit', ['category' => $category, 'categories' => $categories]);
    }

    /**
     * 更新分类
     */
    public function update($id)
    {
        $category = CategoryModel::find($id);
        if (! $category) {
            return json(['code' => 0, 'msg' => '分类不存在']);
        }

        if ((int) Request::post('pid', 0) === (int) $id) {
            return json(['code' => 0, 'msg' => '上级分类不能选择自己']);
        }

        $data              = Request::post();
        $data['pid']       = (int) Request::post('pid', 0);
        $data['update_at'] = time();

        $validate = new Validate([
            'name|分类名称' => 'require|unique:BlogCategory,name,' . $id . ',id,uid,' . $category->uid,
            'pid|上级分类' => 'number',
            'sort|排序'   => 'number|between:0,999',
        ]);

        if (! $validate->check($data)) {
            return json(['code' => 0, 'msg' => $validate->getError()]);
        }

        $category->save($data);
        return json(['code' => 1, 'msg' => '分类更新成功', 'url' => '/blog/backend/category']);
    }

    /**
     * 删除分类
     */
    public function delete($id)
    {
        $category = CategoryModel::find($id);
        if ($category) {
            if ($category->children()->count() > 0) {
                return json(['code' => 0, 'msg' => '该分类下有子分类，请先删除子分类']);
            }
            if ($category->articles()->count() > 0) {
                return json(['code' => 0, 'msg' => '该分类下有文章，无法删除']);
            }
            $category->delete();
            return json(['code' => 1, 'msg' => '分类已删除']);
        }
        return json(['code' => 0, 'msg' => '分类不存在']);
    }

    /**
     * 批量删除分类（前端 treeTable 勾选后调用）
     */
    public function batchDelete()
    {
        $ids = Request::post('ids', '');
        $idArr = array_filter(array_map('intval', explode(',', (string) $ids)));
        if (empty($idArr)) {
            return json(['code' => 0, 'msg' => '请选择要删除的分类']);
        }

        $deleted = 0;
        $skipped = 0;
        foreach ($idArr as $id) {
            $category = CategoryModel::find($id);
            if (! $category) {
                continue;
            }
            if ($category->children()->count() > 0) {
                $skipped++;
                continue;
            }
            if ($category->articles()->count() > 0) {
                $skipped++;
                continue;
            }
            $category->delete();
            $deleted++;
        }

        if ($deleted === 0) {
            return json(['code' => 0, 'msg' => '选中的分类均包含子分类或文章，无法删除']);
        }
        $msg = '成功删除 ' . $deleted . ' 个分类';
        if ($skipped > 0) {
            $msg .= '，' . $skipped . ' 个因含子分类/文章已跳过';
        }
        return json(['code' => 1, 'msg' => $msg]);
    }
}