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

use think\Exception;
use think\facade\Config;
use think\facade\Event;
use think\facade\Log;
use think\file\UploadedFile;
use ywxapp\model\CommonAttachment;
use ywxapp\utils\storage\StorageInterface;

/**
 * FileStorageService 类
 *
 * @author ywxapp <admin@ywxapp.cn>
 */
class FileStorageService
{
    // 驱动常量
    const DRIVER_LOCAL  = 'local';
    const DRIVER_ALIOSS = 'alioss';
    const DRIVER_QCOS   = 'qcos';

    protected $config;
    protected $storage;

    /**
     * 构造函数，读取配置并初始化驱动
     */
    public function __construct()
    {
        // 读取配置文件
        $this->config = Config::get('filesystem', []);
        // 获取当前配置的驱动名称
        $driverName = $this->config['default'] ?? self::DRIVER_LOCAL;
        // 实例化对应的驱动
        $this->initDriver($driverName);
    }

    /**
     * 初始化存储驱动
     */
    protected function initDriver(string $driverName): void
    {
        $drivers = $this->config['disks'] ?? [];
        if (! isset($drivers[$driverName])) {
            throw new Exception("存储驱动配置不存在: {$driverName}");
        }
        $config = $drivers[$driverName];
        $class  = $config['class'];
        if (! class_exists($class)) {
            throw new Exception("存储驱动类不存在: {$class}");
        }
        $this->storage = new $class($config);
        if (! $this->storage instanceof StorageInterface) {
            throw new Exception("存储驱动必须实现 StorageInterface 接口");
        }
    }

    /**
     * 上传文件（对外调用的方法）
     *
     * 提供两个事件扩展点：
     *  - FileUpload   前置分发事件：插件监听并返回结果数组即接管上传（OSS / FTP / 自定义存储）
     *  - FileUploaded 后置通知事件：上传成功后触发，供缩略图、水印、审计等扩展
     *
     * @param UploadedFile $file 上传的文件对象
     * @param string $path 存储路径，留空自动生成
     * @param array $options ['module' => 模块标识, 'rules' => 自定义校验规则（空数组=不校验）]
     * @return array
     */
    public function upload(UploadedFile $file, string $path = '', array $options = []): array
    {
        // 1. 基础验证（文件大小、类型，可用 options.rules 自定义）
        $this->validateFile($file, $options);
        // 2. 未指定路径时生成默认路径
        if (empty($path)) {
            $path = $this->generatePath($file);
        }

        // 3. 前置事件 FileUpload：插件可接管上传，返回结果数组即接管成功
        $handled = Event::trigger('FileUpload', [
            'file'    => $file,
            'path'    => $path,
            'options' => $options,
        ], true);
        if ($handled) {
            $data = $this->buildMeta($file, $handled, $options);
            return $this->finalize($data, $options);
        }

        // 4. 调用内置存储驱动上传
        list($name, $path, $url) = $this->storage->upload($file, $path, $options);
        $data = $this->buildMeta($file, [
            'name'    => $name,
            'path'    => $path,
            'url'     => $url,
            'storage' => $this->config['default'] ?? self::DRIVER_LOCAL,
        ], $options);

        // 5. 写入附件记录 + 后置事件 FileUploaded
        return $this->finalize($data, $options);
    }

    /**
     * 上传收尾：写入附件表记录、触发 FileUploaded 事件、返回带 id 的数据
     */
    protected function finalize(array $data, array $options): array
    {
        $data = $this->recordAttachment($data, $options);
        Event::trigger('FileUploaded', $data);
        return $data;
    }

    /**
     * 写入附件表记录（落库失败不影响上传主流程）
     */
    protected function recordAttachment(array $data, array $options): array
    {
        try {
            $row = CommonAttachment::create([
                'uid'         => (int) ($options['uid'] ?? 0),
                'module'      => (string) ($data['module'] ?? 'index'),
                'path'        => (string) ($data['path'] ?? ''),
                'url'         => (string) ($data['url'] ?? ''),
                'original'    => (string) ($data['original'] ?? ''),
                'name'        => (string) ($data['name'] ?? ''),
                'size'        => (int) ($data['size'] ?? 0),
                'ext'         => (string) ($data['ext'] ?? ''),
                'mime'        => (string) ($data['mime'] ?? ''),
                'storage'     => (string) ($data['storage'] ?? self::DRIVER_LOCAL),
                'driver_info' => $data['driver_info'] ?? [],
                'is_image'    => (int) ($data['is_image'] ?? 0),
                'width'       => (int) ($data['width'] ?? 0),
                'height'      => (int) ($data['height'] ?? 0),
                'upload_ip'   => (string) ($data['upload_ip'] ?? ''),
            ]);
            $data['id'] = (int) $row->id;
        } catch (\Throwable $e) {
            Log::error('附件落库失败: ' . $e->getMessage());
        }
        return $data;
    }

    /**
     * 组装上传元数据
     *
     * @param UploadedFile $file 上传的文件对象
     * @param array $extra 附加数据（name / path / url / storage 等），覆盖默认元数据
     * @param array $options 上传选项
     * @return array
     */
    protected function buildMeta(UploadedFile $file, array $extra, array $options): array
    {
        $data = [
            'module'    => $options['module'] ?? 'index', // 模块标识
            'original'  => $file->getOriginalName(),
            'size'      => $file->getSize(),
            'ext'       => $file->extension(),
            'mime'      => $file->getMime(),
            'is_image'  => (int) str_starts_with($file->getMime(), 'image/'),
            'upload_ip' => request()->ip(),
        ];
        // 图片时尝试获取尺寸
        if ($data['is_image'] && function_exists('getimagesize')) {
            // 注意：如果是云存储，这里可能需要从临时文件获取尺寸
            $tempPath = $file->getRealPath();
            if (file_exists($tempPath)) {
                $imgInfo        = getimagesize($tempPath);
                $data['width']  = $imgInfo[0] ?? 0;
                $data['height'] = $imgInfo[1] ?? 0;
            }
        }
        return array_merge($data, $extra);
    }

    /**
     * 删除文件
     *
     * 前置事件 FileDelete：插件监听并返回 true 即接管物理删除（OSS / FTP 删远端文件）；
     * 无监听时走内置存储驱动。删除成功触发 FileDeleted 事件。
     */
    public function delete(string $path, array $options = []): bool
    {
        $handled = Event::trigger('FileDelete', [
            'path'    => $path,
            'options' => $options,
        ], true);
        if ($handled) {
            Event::trigger('FileDeleted', ['path' => $path, 'handled' => true]);
            return true;
        }
        $ok = $this->storage->delete($path);
        if ($ok) {
            Event::trigger('FileDeleted', ['path' => $path, 'handled' => false]);
        }
        return $ok;
    }

    /**
     * 获取URL
     */
    public function getUrl(string $path): string
    {
        return $this->storage->getUrl($path);
    }

    /**
     * 基础文件验证，可用 options.rules 自定义规则，空数组表示不校验
     */
    protected function validateFile(UploadedFile $file, array $options): void
    {
        $rules = $options['rules'] ?? [
            // 限制文件大小(单位b)，这里限制为4M
            'fileSize' => 4 * 1024 * 1024,
            // 限制文件后缀，多个后缀以英文逗号分割
            'fileExt'  => 'gif,jpg,png',
        ];
        if (empty($rules)) {
            return;
        }
        validate(
            ['file' => $rules],
            [
                'file.fileSize' => '文件太大',
                'file.fileExt'  => '不支持的文件后缀',
            ]
        )->check(['file' => $file]);
    }

    /**
     * 生成唯一文件路径
     */
    protected function generatePath(UploadedFile $file): string
    {
        $ext      = $file->getClientOriginalExtension();
        $date     = date('Y/m/d');
        $filename = date('His') . '_' . uniqid() . ".{$ext}";
        return "{$date}/{$filename}";
    }

    /**
     * 魔术方法，允许直接调用驱动的其他特有方法
     */
    public function __call($method, $parameters)
    {
        if (method_exists($this->storage, $method)) {
            return call_user_func_array([$this->storage, $method], $parameters);
        }
        throw new \BadMethodCallException("Method {$method} does not exist.");
    }
}