<?php

declare(strict_types=1);

namespace addon\download\controller\backend;

use think\exception\ValidateException;
use think\facade\Db;
use addon\download\model\Category as CategoryModel;
use addon\download\model\Resource;

use ywxapp\controller\BackendBase;
class Category extends BackendBase
{
    protected $noNeedVerify = ['*'];

    protected function initialize()
    {
        $this->model = new CategoryModel();
    }

    public function index()
    {
        if ($this->request->isAjax()) {
            $title = $this->request->param('title', '');
            $all   = $this->model->order('sort', 'desc')->order('id', 'asc')->select()->toArray();
            //$tree  = CategoryModel::toNestedTree($all);

            // 关键字过滤：命中节点保留，并保留其祖先链
           // if ($title) {
           //     $tree = $this->filterTree($tree, $title);
          //  }
            $this->result->success($all);
        }
        return $this->view->fetch('category/index');
    }

    /**
     * 按标题关键字过滤树，保留命中节点及其祖先链
     */
    protected function filterTree(array $tree, string $keyword): array
    {
        $result = [];
        foreach ($tree as $node) {
            $children = !empty($node['children']) ? $this->filterTree($node['children'], $keyword) : [];
            $hit      = stripos($node['title'], $keyword) !== false;
            if ($hit || !empty($children)) {
                $node['children'] = $children;
                $result[]         = $node;
            }
        }
        return $result;
    }

    public function create()
    {
        if ($this->request->isAjax()) {
            $data = CategoryModel::cateTree($this->model->select()->toArray());
            $this->result->success(['data' => $data]);
        }
    }

    public function save()
    {
        if ($this->request->isPost()) {
            $params = $this->request->post();
            $this->validateSave($params);
            Db::startTrans();
            try {
                $this->model->save($params);
                Db::commit();
                $this->result->success($this->model, '保存成功');
            } catch (\Exception $e) {
                Db::rollback();
                $this->result->error('保存失败: ' . $e->getMessage());
            }
        }
    }

    public function edit($id = null)
    {
        $id    = $this->request->param('id');
        $model = $this->model->find($id);
        if (!$model) {
            $this->result->error('数据不存在');
        }
        if ($this->request->isAjax()) {
            $tree = CategoryModel::cateTree($this->model->select()->toArray());
            $this->result->success(['power' => $tree, 'info' => $model]);
        }
    }

    public function update()
    {
        $id = $this->request->param('id');
        if ($this->request->isAjax() && $this->request->isPut()) {
            $params = $this->request->param();
            $this->validateSave($params);
            Db::startTrans();
            try {
                $model = $this->model->find($id);
                if (!$model) {
                    throw new ValidateException('数据不存在');
                }
                $model->save($params);
                Db::commit();
                $this->result->success($model, '更新成功');
            } catch (\Exception $e) {
                Db::rollback();
                $this->result->error('更新失败: ' . $e->getMessage());
            }
        }
    }

    public function delete()
    {
        if ($this->request->isAjax() && $this->request->isDelete()) {
            $ids  = $this->request->param('ids', '');
            $force = $this->request->param('force/d', 0);
            if (empty($ids)) {
                $this->result->error('请选择要删除的数据');
            }
            $idArr = array_filter(array_map('intval', explode(',', $ids)));
            try {
                Db::transaction(function () use ($idArr, $force) {
                    foreach ($idArr as $id) {
                        $this->deleteCascade($id, (bool) $force);
                    }
                });
                $this->result->success();
            } catch (\think\exception\HttpResponseException $e) {
                throw $e;
            } catch (\Throwable $th) {
                $this->result->error('删除失败: ' . $th->getMessage());
            }
        }
    }

    /**
     * 递归级联删除：force=true 时先删子分类下的资源与子分类，再删自身
     */
    protected function deleteCascade($id, bool $force): void
    {
        $model = $this->model->find($id);
        if (!$model) {
            return;
        }
        if ($force) {
            Resource::where('cid', $id)->delete();
            $children = $this->model->where('pid', $id)->select();
            foreach ($children as $child) {
                $this->deleteCascade($child['id'], true);
            }
        }
        // 非 force 时若仍有子分类/资源，onBeforeDelete 会抛出异常阻止删除
        $model->delete();
    }

    protected function validateSave(array $params): void
    {
        if (empty($params['title'])) {
            throw new ValidateException('分类名称不能为空');
        }
    }
}