import formidable, { Fields, Files } from "formidable";
import IncomingForm from "formidable/Formidable";
import path from "path"
import fs  from "fs"
import { Request } from "express"

const uploadDir = "uploads"
const finalDir = path.join(__dirname, "..", uploadDir)
if (!fs.existsSync(finalDir)) {
    fs.mkdirSync(finalDir)
}

export const form = formidable({ 
    multiples: true,
    uploadDir: finalDir,
    keepExtensions: true,
    maxFiles: 1,
    maxFileSize: 200 * 1024 ** 2,
    filter: part => part.mimetype?.startsWith('image/') || false,
    filename: (originalName, originalExt, part, form) => {
        let fieldName = part.name;
        let timestamp = Date.now();
        let ext = part.mimetype?.split("/").pop();
        return `${fieldName}-${timestamp}.${ext}`;
    },
});

export function formParse(form: IncomingForm, req: Request) {
    return new Promise<{ fields: Fields; files: Files }>((resolve, reject) => {
      form.parse(req, (err, fields, files) => {
        if (err) {
          reject(err);
        } else {
          resolve({ fields, files });
        }
      });
    });
}