import { randomBytes } from "crypto";

import { sendEmailVerificationLink } from "@calcom/emails/email-manager";
import { getFeatureFlagMap } from "@calcom/features/flags/server/utils";
import { WEBAPP_URL } from "@calcom/lib/constants";
import logger from "@calcom/lib/logger";
import rateLimiter from "@calcom/lib/rateLimit";
import { getTranslation } from "@calcom/lib/server/i18n";
import { prisma } from "@calcom/prisma";
import { TRPCError } from "@calcom/trpc/server";

const log = logger.getChildLogger({ prefix: [`[[Auth] `] });

interface VerifyEmailType {
  username?: string;
  email: string;
  language?: string;
}

export const sendEmailVerification = async ({ email, language, username }: VerifyEmailType) => {
  const token = randomBytes(32).toString("hex");
  const translation = await getTranslation(language ?? "en", "common");
  const flags = await getFeatureFlagMap(prisma);

  if (!flags["email-verification"]) {
    log.warn("Email verification is disabled - Skipping");
    return { ok: true, skipped: true };
  }

  await prisma.verificationToken.create({
    data: {
      identifier: email,
      token,
      expires: new Date(Date.now() + 24 * 3600 * 1000), // +1 day
    },
  });

  const params = new URLSearchParams({
    token,
  });

  const limiter = await rateLimiter();
  const rateLimit = await limiter({
    identifier: email,
  });

  if (!rateLimit.success) {
    throw new TRPCError({
      code: "TOO_MANY_REQUESTS",
      message: "An unexpected error occurred, please try again later.",
      cause: "Too many requests",
    });
  }

  await sendEmailVerificationLink({
    language: translation,
    verificationEmailLink: `${WEBAPP_URL}/api/auth/verify-email?${params.toString()}`,
    user: {
      email,
      name: username,
    },
  });

  return { ok: true, skipped: false };
};