import * as bcrypt from "bcryptjs";
import { OtpGenerator, OtpGeneratorSixDigit } from "./OtpGenerator";
import { encryptUserId } from "./CodeGenerator";

export interface OtpResult {
  otp: string;
  hashedOtp: string;
  expiry: Date;
  encryptedId: string;
}

export async function resendOtpHelper(
  prisma: any,                            
  userId: number,
  emailPurpose: "Register" | "Login" | "ForgotPassword",
  otpLength: 4 | 6 = 4,
  expiryMinutes: number = 5
): Promise<OtpResult> {

  // 1️⃣  Deactivate previous OTPs
  await prisma.userOtp.updateMany({
    where: {
      userXid: userId,
      otpType: emailPurpose,
      isActive: true,
    },
    data: {
      isActive: false,
      isVerified: true,
    },
  });

  // 2️⃣ Generate new OTP
  const otp =
    otpLength === 6
      ? OtpGeneratorSixDigit.generateOtp()
      : OtpGenerator.generateOtp();

  const hashedOtp = await bcrypt.hash(otp, 10);
  const expiry = new Date(Date.now() + expiryMinutes * 60000);
  const encryptedId = encryptUserId(userId.toString());

  // 3️⃣ Insert new OTP into table
  await prisma.userOtp.create({
    data: {
      userXid: userId,
      otpType: emailPurpose,
      otpCode: hashedOtp,
      expiresOn: expiry,
      isVerified: false,
      isActive: true,
    },
  });

  // 4️⃣ Return new OTP (email will use this)
  return {
    otp,
    hashedOtp,
    expiry,
    encryptedId,
  };
}