<?php

namespace App\Module\Article\Services;

use App\Module\Article\Enums\STATUS;
use App\Module\Article\Logics\ArticleCategoryLogic;
use App\Module\Article\Models\ArticleCate;
use Illuminate\Support\Collection;
use Illuminate\Support\Facades\Cache;

/**
 * 文章分类服务类
 *
 * 提供文章分类相关的服务方法，供其他模块调用
 */
class ArticleCategoryService
{
    /**
     * 获取所有分类
     *
     * @param bool $onlyActive 是否只获取激活状态的分类
     * @return Collection
     */
    public static function getAllCategories(bool $onlyActive = true): Collection
    {
        $cacheKey = 'article_categories_' . ($onlyActive ? 'active' : 'all');

        return Cache::remember($cacheKey, 3600, function () use ($onlyActive) {
            $query = ArticleCate::query();

            if ($onlyActive) {
                $query->where('status', STATUS::SHOW->value);
            }

            return $query->orderBy('sort_order', 'asc')->get();
        });
    }

    /**
     * 获取分类树
     *
     * @param bool $onlyActive 是否只获取激活状态的分类
     * @return array
     */
    public static function getCategoryTree(bool $onlyActive = true): array
    {
        $cacheKey = 'article_category_tree_' . ($onlyActive ? 'active' : 'all');

        return Cache::remember($cacheKey, 3600, function () use ($onlyActive) {
            $categories = self::getAllCategories($onlyActive);
            return self::buildCategoryTree($categories);
        });
    }

    /**
     * 构建分类树
     *
     * @param Collection $categories 分类集合
     * @param int $parentId 父级ID
     * @return array
     */
    protected static function buildCategoryTree(Collection $categories, int $parentId = 0): array
    {
        $tree = [];

        foreach ($categories as $category) {
            if ($category->pid == $parentId) {
                $children = self::buildCategoryTree($categories, $category->id);

                if ($children) {
                    $category->children = $children;
                }

                $tree[] = $category;
            }
        }

        return $tree;
    }

    /**
     * 获取分类详情
     *
     * @param int $id 分类ID
     * @return ArticleCate|null
     */
    public static function getCategoryDetail(int $id): ?ArticleCate
    {
        return ArticleCate::find($id);
    }

    /**
     * 根据标识获取分类
     *
     * @param string $unid 分类标识
     * @return ArticleCate|null
     */
    public static function getCategoryByUnid(string $unid): ?ArticleCate
    {
        return ArticleCate::where('unid', $unid)->first();
    }

    /**
     * 创建分类
     *
     * @param array $data 分类数据
     * @return ArticleCate
     */
    public static function createCategory(array $data): ArticleCate
    {
        $category = ArticleCategoryLogic::createCategory($data);

        // 清除相关缓存
        self::clearCategoryCache();

        return $category;
    }

    /**
     * 更新分类
     *
     * @param int $id 分类ID
     * @param array $data 分类数据
     * @return bool
     */
    public static function updateCategory(int $id, array $data): bool
    {
        $result = ArticleCategoryLogic::updateCategory($id, $data);

        // 清除相关缓存
        self::clearCategoryCache();

        return $result;
    }

    /**
     * 删除分类
     *
     * @param int $id 分类ID
     * @return bool
     */
    public static function deleteCategory(int $id): bool
    {
        $result = ArticleCategoryLogic::deleteCategory($id);

        // 清除相关缓存
        self::clearCategoryCache();

        return $result;
    }

    /**
     * 清除分类相关缓存
     *
     * @return void
     */
    public static function clearCategoryCache(): void
    {
        Cache::forget('article_categories_active');
        Cache::forget('article_categories_all');
        Cache::forget('article_category_tree_active');
        Cache::forget('article_category_tree_all');
    }
}