import multer from "multer";
import { diskStorage } from "multer";
import path from 'path';

// Allowed video file extensions
const allowedVideoTypes = ['.mp4', '.mov', '.avi', '.temp'];

// Filter to check if the file is an image or a video (with specific extensions)
const multerFilter = (req, file, cb) => {
    // Check if the file is an image
    if (file.mimetype.startsWith("image")) {
        cb(null, true);
    } else if (file.mimetype.startsWith("video")) {
        // Check if the video has a valid extension (.mp4, .mov, .avi)
        const extname = path.extname(file.originalname).toLowerCase();
        if (allowedVideoTypes.includes(extname)) {
            cb(null, true); 
        } else {
            cb(new Error("Only .temp, .mp4, .mov, or .avi video files are allowed."), false); // Reject invalid video types
        }
    } else {
        cb(new Error("Please upload only images or videos."), false); // Reject if neither image nor video
    }
};

// Storage settings
const storage = diskStorage({
    destination: (req, file, cb) => {
        // Dynamically set the destination folder based on MIME type
        if (file.mimetype.startsWith("image")) {
            cb(null, './public/images');  
        } else if (file.mimetype.startsWith("video")) {
            cb(null, './public/videos');  
        }
    },
    filename: (req, file, cb) => {
 
        const originalName = path.basename(file.originalname, path.extname(file.originalname));
        

        const customFileName = `${originalName}_${Date.now()}${path.extname(file.originalname)}`;
        
        
        cb(null, customFileName);  // E.g., "myImage_1634567890123.jpg" or "videoClip_1634567890123.mp4"
    }
    
});


const upload = multer({
    storage: storage,
    fileFilter: multerFilter,
    limits: {
        fileSize: 1024 * 1024 * 50 // 20MB file size limit
    }
});

// Error handling middleware for multer
export const multerErrorHandler = (err, req, res, next) => {
    if (err instanceof multer.MulterError) {
        // If the error is related to file size or other Multer error
        return res.status(400).json({ message: err.message });
    } else if (err) {
    
        return res.status(400).json({ message: err.message });
    }
    next();
}

export default upload;