import multer from 'multer';
import path from 'path';
import { v4 as uuidv4 } from 'uuid';
import { config } from '../config/index.js';
import { AppError } from './error.js';
import { ERROR_CODES, HTTP_STATUS } from '@media-manager/shared';
import fs from 'fs';

// 确保上传目录存在
const uploadDirs = ['videos', 'images', 'covers'];
uploadDirs.forEach(dir => {
  const fullPath = path.join(config.upload.path, dir);
  if (!fs.existsSync(fullPath)) {
    try {
      fs.mkdirSync(fullPath, { recursive: true });
    } catch (err) {
      console.error(`[upload] Failed to create upload dir ${fullPath}:`, err);
    }
  }
});

// 视频存储配置
const videoStorage = multer.diskStorage({
  destination: (_req, _file, cb) => {
    cb(null, path.join(config.upload.path, 'videos'));
  },
  filename: (_req, file, cb) => {
    const ext = path.extname(file.originalname);
    cb(null, `${uuidv4()}${ext}`);
  },
});

// 图片存储配置
const imageStorage = multer.diskStorage({
  destination: (_req, _file, cb) => {
    cb(null, path.join(config.upload.path, 'images'));
  },
  filename: (_req, file, cb) => {
    const ext = path.extname(file.originalname);
    cb(null, `${uuidv4()}${ext}`);
  },
});

// 视频文件过滤
const videoFilter = (_req: Express.Request, file: Express.Multer.File, cb: multer.FileFilterCallback) => {
  if (config.upload.allowedVideoTypes.includes(file.mimetype)) {
    cb(null, true);
  } else {
    cb(new AppError(
      '不支持的视频格式',
      HTTP_STATUS.BAD_REQUEST,
      ERROR_CODES.VIDEO_FORMAT_UNSUPPORTED
    ));
  }
};

// 图片文件过滤
const imageFilter = (_req: Express.Request, file: Express.Multer.File, cb: multer.FileFilterCallback) => {
  if (config.upload.allowedImageTypes.includes(file.mimetype)) {
    cb(null, true);
  } else {
    cb(new AppError(
      '不支持的图片格式',
      HTTP_STATUS.BAD_REQUEST,
      ERROR_CODES.VALIDATION
    ));
  }
};

// 视频上传中间件
export const uploadVideo = multer({
  storage: videoStorage,
  limits: {
    fileSize: config.upload.maxVideoSize,
  },
  fileFilter: videoFilter,
}).single('video');

// 图片上传中间件
export const uploadImage = multer({
  storage: imageStorage,
  limits: {
    fileSize: config.upload.maxImageSize,
  },
  fileFilter: imageFilter,
}).single('image');

// 封面上传中间件
export const uploadCover = multer({
  storage: multer.diskStorage({
    destination: (_req, _file, cb) => {
      cb(null, path.join(config.upload.path, 'covers'));
    },
    filename: (_req, file, cb) => {
      const ext = path.extname(file.originalname);
      cb(null, `${uuidv4()}${ext}`);
    },
  }),
  limits: {
    fileSize: config.upload.maxImageSize,
  },
  fileFilter: imageFilter,
}).single('cover');