<?php
namespace App\Domains\Category\Services;

use App\Core\Service;
use Illuminate\Validation\Rule;
use App\Exceptions\NotExistException;
use Illuminate\Support\Facades\Validator;
use App\Exceptions\InvalidArgumentException;
use App\Domains\Category\Repositories\CategoryRepository;

class CategoryService extends Service
{
    public static $types = [
        'test', 'service', 'device'
    ];

    protected $categoryRepository;
    protected $application;
    protected $account;
    protected $type;

    /**
     * 构造函数
     *
     * @return void
     */
    public function __construct(CategoryRepository $categoryRepository)
    {
        $this->categoryRepository = $categoryRepository;
        $this->application = app('dipper')->application;
        $this->account = app('dipper')->initAccount();
    }

    /**
     * 分类列表
     *
     * @param array $conditions
     * @return void
     */
    public function index($conditions = [])
    {
        self::verifyType($conditions['type']);

        $query = $this->categoryRepository->withConditions($conditions)->applyConditions();

        if ($conditions['limit']) {
            $categories = $query->paginate($conditions['limit']);
        } else {
            $categories = $query->get();
        }

        $parent_ids = $categories->pluck('parent_id')->unique()->except([0])->toArray();

        $parents = $this->categoryRepository->select('id', 'name')->withConditions(['ids' => $parent_ids])->get()->keyBy('id');

        $categories->map(function ($item) use ($parents) {
            $item->parent_name = $parents[$item->parent_id]['name'] ?? '';
        });
        
        return $categories;
    }

    /**
     * Show
     *
     * @param array $conditions
     * @return void
     */
    public function show($id)
    {
        return $this->categoryRepository->applyConditions()->find($id);
    }

    /**
     * 添加\编辑分类
     *
     * @param array $attributes
     * @return void
     */
    public function store(array $attributes)
    {
        $attributes = array_only($attributes, ['id', 'parent_id', 'name', 'type', 'extend', 'status']);
        $attributes['appid'] = $this->application->id;
        $attributes['account_id'] = $this->account->id;

        $rule = [
            'appid' => ['required'],
            'name' => ['display_length:32', Rule::unique($this->categoryRepository->getTable())->where(function ($query) use ($attributes) {
                return $query->where('appid', $attributes['appid'])->where('type', $attributes['type'])->where('name', $attributes['name']);
            })->ignore($attributes['id'])],
            'type' => [Rule::in(self::$types)],
            'status' => ['in:0,1'],
        ];

        if (!$attributes['id']) {
            $rule['name'][] = 'required';
        }

        $message = [
            'name.unique' => '分类名已存在',
            'appid.required' => '该账号未分配到应用',
        ];

        Validator::validate($attributes, $rule, $message);

        if ($attributes['parent_id']) {
            if (!$parent = $this->categoryRepository->ofType($attributes['type'])->find($attributes['parent_id'])) {
                throw new NotExistException('父级分类不存在或已删除');
            }
        }

        if (!$attributes['id']) {
            $category = $this->categoryRepository->create($attributes, $parent);
            return $category;
        }

        if (!$category = $this->categoryRepository->ofType($attributes['type'])->find($attributes['id'])) {
            throw new NotExistException('分类不存在或已删除');
        }

        if ($parent && $category->parent_id !== $parent->id) {
            $category->appendToNode($parent);
        }

        $this->categoryRepository->setModel($category)->update($attributes);

        return $category;
    }

    /**
     * 删除
     *
     * @param int|string|array $ids
     * @return bool
     */
    public function destroy($type, $ids)
    {
        $ids = is_array($ids) ? $ids : [$ids];

        $categories = $this->categoryRepository->with('children')->withConditions(['type' => $type, 'ids' => $ids])->get();

        foreach ($categories as $category) {
            if (count($category->children)) {
                throw new InvalidArgumentException("分类($category)含有子分类, 不能删除");
            }
        }

        $this->categoryRepository->withConditions($conditions)->destroy($ids);

        return true;
    }

    /**
     * 验证类型是否合法
     *
     * @param string $type
     * @return void
     */
    public static function verifyType($type)
    {
        if (!in_array($type, self::$types)) {
            throw new InvalidArgumentException('类型不合法');
        }

        return $type;
    }
}