import { zodResolver } from "@hookform/resolvers/zod";
import type { GetServerSidePropsContext } from "next";
import { signIn } from "next-auth/react";
import { useSearchParams } from "next/navigation";
import type { CSSProperties } from "react";
import type { SubmitHandler } from "react-hook-form";
import { FormProvider, useForm } from "react-hook-form";
import { z } from "zod";

import { checkPremiumUsername } from "@calcom/features/ee/common/lib/checkPremiumUsername";
import { getOrgFullDomain } from "@calcom/features/ee/organizations/lib/orgDomains";
import { isSAMLLoginEnabled } from "@calcom/features/ee/sso/lib/saml";
import { useFlagMap } from "@calcom/features/flags/context/provider";
import { getFeatureFlagMap } from "@calcom/features/flags/server/utils";
import { IS_SELF_HOSTED, WEBAPP_URL } from "@calcom/lib/constants";
import { useLocale } from "@calcom/lib/hooks/useLocale";
import slugify from "@calcom/lib/slugify";
import { collectPageParameters, telemetryEventTypes, useTelemetry } from "@calcom/lib/telemetry";
import { teamMetadataSchema } from "@calcom/prisma/zod-utils";
import { signupSchema as apiSignupSchema } from "@calcom/prisma/zod-utils";
import type { inferSSRProps } from "@calcom/types/inferSSRProps";
import { Alert, Button, EmailField, HeadSeo, PasswordField, TextField } from "@calcom/ui";

import PageWrapper from "@components/PageWrapper";

import { IS_GOOGLE_LOGIN_ENABLED } from "../server/lib/constants";
import { ssrInit } from "../server/lib/ssr";

const signupSchema = apiSignupSchema.extend({
  apiError: z.string().optional(), // Needed to display API errors doesnt get passed to the API
});

type FormValues = z.infer<typeof signupSchema>;

type SignupProps = inferSSRProps<typeof getServerSideProps>;

const checkValidEmail = (email: string) => z.string().email().safeParse(email).success;

const getOrgUsernameFromEmail = (email: string, autoAcceptEmailDomain: string) => {
  const [emailUser, emailDomain] = email.split("@");
  const username =
    emailDomain === autoAcceptEmailDomain
      ? slugify(emailUser)
      : slugify(`${emailUser}-${emailDomain.split(".")[0]}`);

  return username;
};

function addOrUpdateQueryParam(url: string, key: string, value: string) {
  const separator = url.includes("?") ? "&" : "?";
  const param = `${key}=${encodeURIComponent(value)}`;
  return `${url}${separator}${param}`;
}

export default function Signup({ prepopulateFormValues, token, orgSlug, orgAutoAcceptEmail }: SignupProps) {
  const searchParams = useSearchParams();
  const telemetry = useTelemetry();
  const { t, i18n } = useLocale();
  const flags = useFlagMap();
  const methods = useForm<FormValues>({
    mode: "onChange",
    resolver: zodResolver(signupSchema),
    defaultValues: prepopulateFormValues,
  });
  const {
    register,
    formState: { errors, isSubmitting },
  } = methods;

  const handleErrors = async (resp: Response) => {
    if (!resp.ok) {
      const err = await resp.json();
      throw new Error(err.message);
    }
  };

  const isOrgInviteByLink = orgSlug && !prepopulateFormValues?.username;

  const signUp: SubmitHandler<FormValues> = async (data) => {
    await fetch("/api/auth/signup", {
      body: JSON.stringify({
        ...data,
        language: i18n.language,
        token,
      }),
      headers: {
        "Content-Type": "application/json",
      },
      method: "POST",
    })
      .then(handleErrors)
      .then(async () => {
        telemetry.event(telemetryEventTypes.signup, collectPageParameters());
        const verifyOrGettingStarted = flags["email-verification"] ? "auth/verify-email" : "getting-started";
        const callBackUrl = `${
          searchParams?.get("callbackUrl")
            ? isOrgInviteByLink
              ? `${WEBAPP_URL}/${searchParams.get("callbackUrl")}`
              : addOrUpdateQueryParam(`${WEBAPP_URL}/${searchParams.get("callbackUrl")}`, "from", "signup")
            : `${WEBAPP_URL}/${verifyOrGettingStarted}?from=signup`
        }`;

        await signIn<"credentials">("credentials", {
          ...data,
          callbackUrl: callBackUrl,
        });
      })
      .catch((err) => {
        methods.setError("apiError", { message: err.message });
      });
  };

  return (
    <>
      <div
        className="bg-muted flex min-h-screen flex-col justify-center "
        style={
          {
            "--cal-brand": "#111827",
            "--cal-brand-emphasis": "#101010",
            "--cal-brand-text": "white",
            "--cal-brand-subtle": "#9CA3AF",
          } as CSSProperties
        }
        aria-labelledby="modal-title"
        role="dialog"
        aria-modal="true">
        <HeadSeo title={t("sign_up")} description={t("sign_up")} />
        <div className="sm:mx-auto sm:w-full sm:max-w-md">
          <h2 className="font-cal text-emphasis text-center text-3xl font-extrabold">
            {t("create_your_account")}
          </h2>
        </div>
        <div className="mt-8 sm:mx-auto sm:w-full sm:max-w-md">
          <div className="bg-default mx-2 p-6 shadow sm:rounded-lg lg:p-8">
            <FormProvider {...methods}>
              <form
                onSubmit={(event) => {
                  event.preventDefault();
                  event.stopPropagation();

                  if (methods.formState?.errors?.apiError) {
                    methods.clearErrors("apiError");
                  }

                  if (methods.getValues().username === undefined && isOrgInviteByLink && orgAutoAcceptEmail) {
                    methods.setValue(
                      "username",
                      getOrgUsernameFromEmail(methods.getValues().email, orgAutoAcceptEmail)
                    );
                  }
                  methods.handleSubmit(signUp)(event);
                }}
                className="bg-default space-y-6">
                {errors.apiError && <Alert severity="error" message={errors.apiError?.message} />}
                {}
                <div className="space-y-4">
                  {!isOrgInviteByLink && (
                    <TextField
                      addOnLeading={
                        orgSlug
                          ? `${getOrgFullDomain(orgSlug, { protocol: true })}/`
                          : `${process.env.NEXT_PUBLIC_WEBSITE_URL}/`
                      }
                      {...register("username")}
                      disabled={!!orgSlug}
                      required
                    />
                  )}
                  <EmailField
                    {...register("email")}
                    disabled={prepopulateFormValues?.email}
                    className="disabled:bg-emphasis disabled:hover:cursor-not-allowed"
                  />
                  <PasswordField
                    labelProps={{
                      className: "block text-sm font-medium text-default",
                    }}
                    {...register("password")}
                    hintErrors={["caplow", "min", "num"]}
                    className="border-default mt-1 block w-full rounded-md border px-3 py-2 shadow-sm focus:border-black focus:outline-none focus:ring-black sm:text-sm"
                  />
                </div>
                <div className="flex space-x-2 rtl:space-x-reverse">
                  <Button type="submit" loading={isSubmitting} className="w-full justify-center">
                    {t("create_account")}
                  </Button>
                  {!token && (
                    <Button
                      color="secondary"
                      className="w-full justify-center"
                      onClick={() =>
                        signIn("Cal.com", {
                          callbackUrl: searchParams?.get("callbackUrl")
                            ? `${WEBAPP_URL}/${searchParams.get("callbackUrl")}`
                            : `${WEBAPP_URL}/getting-started`,
                        })
                      }>
                      {t("login_instead")}
                    </Button>
                  )}
                </div>
              </form>
            </FormProvider>
          </div>
        </div>
      </div>
    </>
  );
}

export const getServerSideProps = async (ctx: GetServerSidePropsContext) => {
  const prisma = await import("@calcom/prisma").then((mod) => mod.default);
  const flags = await getFeatureFlagMap(prisma);
  const ssr = await ssrInit(ctx);
  const token = z.string().optional().parse(ctx.query.token);

  const props = {
    isGoogleLoginEnabled: IS_GOOGLE_LOGIN_ENABLED,
    isSAMLLoginEnabled,
    trpcState: ssr.dehydrate(),
    prepopulateFormValues: undefined,
  };

  if (process.env.NEXT_PUBLIC_DISABLE_SIGNUP === "true" || flags["disable-signup"]) {
    return {
      notFound: true,
    };
  }

  // no token given, treat as a normal signup without verification token
  if (!token) {
    return {
      props: JSON.parse(JSON.stringify(props)),
    };
  }

  const verificationToken = await prisma.verificationToken.findUnique({
    where: {
      token,
    },
    include: {
      team: {
        select: {
          metadata: true,
          parentId: true,
          parent: {
            select: {
              slug: true,
              metadata: true,
            },
          },
          slug: true,
        },
      },
    },
  });

  if (!verificationToken || verificationToken.expires < new Date()) {
    return {
      notFound: true,
    };
  }

  const existingUser = await prisma.user.findFirst({
    where: {
      AND: [
        {
          email: verificationToken?.identifier,
        },
        {
          emailVerified: {
            not: null,
          },
        },
      ],
    },
  });

  if (existingUser) {
    return {
      redirect: {
        permanent: false,
        destination: `/auth/login?callbackUrl=${WEBAPP_URL}/${ctx.query.callbackUrl}`,
      },
    };
  }

  const guessUsernameFromEmail = (email: string) => {
    const [username] = email.split("@");
    return username;
  };

  let username = guessUsernameFromEmail(verificationToken.identifier);

  const tokenTeam = {
    ...verificationToken?.team,
    metadata: teamMetadataSchema.parse(verificationToken?.team?.metadata),
  };

  // Detect if the team is an org by either the metadata flag or if it has a parent team
  const isOrganization = tokenTeam.metadata?.isOrganization || tokenTeam?.parentId !== null;
  // If we are dealing with an org, the slug may come from the team itself or its parent
  const orgSlug = isOrganization
    ? tokenTeam.metadata?.requestedSlug || tokenTeam.parent?.slug || tokenTeam.slug
    : null;

  // Org context shouldn't check if a username is premium
  if (!IS_SELF_HOSTED && !isOrganization) {
    // Im not sure we actually hit this because of next redirects signup to website repo - but just in case this is pretty cool :)
    const { available, suggestion } = await checkPremiumUsername(username);

    username = available ? username : suggestion || username;
  }

  const isValidEmail = checkValidEmail(verificationToken.identifier);
  const isOrgInviteByLink = isOrganization && !isValidEmail;
  const parentMetaDataForSubteam = tokenTeam?.parent?.metadata
    ? teamMetadataSchema.parse(tokenTeam.parent.metadata)
    : null;

  return {
    props: {
      ...props,
      token,
      prepopulateFormValues: !isOrgInviteByLink
        ? {
            email: verificationToken.identifier,
            username: slugify(username),
          }
        : null,
      orgSlug,
      orgAutoAcceptEmail: isOrgInviteByLink
        ? tokenTeam?.metadata?.orgAutoAcceptEmail ?? parentMetaDataForSubteam?.orgAutoAcceptEmail ?? null
        : null,
    },
  };
};

Signup.isThemeSupported = false;
Signup.PageWrapper = PageWrapper;