<?php

namespace app\common\logic;

use app\common\traits\crud\CrudLogicTrait;
use app\common\model\UploadedFiles;

class UploadedFilesLogic
{
    use CrudLogicTrait;

    /**
     * 指定当前要操作的模型
     */
    protected string $modelClass = UploadedFiles::class;

    /**
     * 根据分区获取文件列表
     * 
     * @param string $partition
     * @param int $limit
     * @param int $page
     * @return mixed
     */
    public function getFilesByPartition(string $partition, int $limit = 15, int $page = 1)
    {
        $config = [
            'model' => $this->modelClass,
            'where' => ['partition' => $partition],
            'order' => ['created_at' => 'desc', 'id' => 'desc']
        ];

        return $this->logicList($config, $limit, $page);
    }

    /**
     * 根据分类获取文件列表
     * 
     * @param string $category
     * @param int $limit
     * @param int $page
     * @return mixed
     */
    public function getFilesByCategory(string $category, int $limit = 15, int $page = 1)
    {
        $config = [
            'model' => $this->modelClass,
            'where' => ['category' => $category],
            'order' => ['created_at' => 'desc', 'id' => 'desc']
        ];

        return $this->logicList($config, $limit, $page);
    }

    /**
     * 根据文件类型获取文件列表
     * 
     * @param string $fileType
     * @param int $limit
     * @param int $page
     * @return mixed
     */
    public function getFilesByType(string $fileType, int $limit = 15, int $page = 1)
    {
        $config = [
            'model' => $this->modelClass,
            'where' => ['file_type' => $fileType],
            'order' => ['created_at' => 'desc', 'id' => 'desc']
        ];

        return $this->logicList($config, $limit, $page);
    }

    /**
     * 搜索文件
     * 
     * @param string $keyword
     * @param int $limit
     * @param int $page
     * @return mixed
     */
    public function searchFiles(string $keyword, int $limit = 15, int $page = 1)
    {
        $config = [
            'model' => $this->modelClass,
            'where' => [
                'or' => [
                    ['file_name', 'like', '%' . $keyword . '%'],
                    ['original_name', 'like', '%' . $keyword . '%'],
                    ['category', 'like', '%' . $keyword . '%']
                ]
            ],
            'order' => ['created_at' => 'desc', 'id' => 'desc']
        ];

        return $this->logicList($config, $limit, $page);
    }

    /**
     * 获取文件统计信息
     * 
     * @return array
     */
    public function getFileStatistics(): array
    {
        $model = new $this->modelClass();
        
        $totalFiles = $model->count();
        $totalSize = $model->sum('file_size');
        
        $partitionStats = $model->selectRaw('partition, COUNT(*) as count, SUM(file_size) as size')
            ->groupBy('partition')
            ->get()
            ->toArray();
            
        $categoryStats = $model->selectRaw('category, COUNT(*) as count, SUM(file_size) as size')
            ->groupBy('category')
            ->get()
            ->toArray();
            
        $typeStats = $model->selectRaw('file_type, COUNT(*) as count, SUM(file_size) as size')
            ->groupBy('file_type')
            ->get()
            ->toArray();

        return [
            'total_files' => $totalFiles,
            'total_size' => $totalSize,
            'partition_stats' => $partitionStats,
            'category_stats' => $categoryStats,
            'type_stats' => $typeStats
        ];
    }

    /**
     * 清理过期文件
     * 
     * @param int $days 保留天数
     * @return int 清理的文件数量
     */
    public function cleanExpiredFiles(int $days = 30): int
    {
        $expiredTime = time() - ($days * 24 * 60 * 60);
        
        $config = [
            'model' => $this->modelClass,
            'where' => [
                ['created_at', '<', $expiredTime]
            ]
        ];

        $files = $this->logicListAll($config);
        $count = 0;

        foreach ($files as $file) {
            // 删除物理文件
            $fullPath = public_path() . $file->file_path;
            if (file_exists($fullPath)) {
                unlink($fullPath);
            }
            
            // 删除数据库记录
            $this->logicDeleteBy(['where' => ['id' => $file->id]]);
            $count++;
        }

        return $count;
    }
}