/*
Copyright 2021-2024 New Vector Ltd.

SPDX-License-Identifier: AGPL-3.0-only
Please see LICENSE in the repository root for full details.
*/

import {
  type ChangeEvent,
  type FC,
  type FormEvent,
  useCallback,
  useEffect,
  useRef,
  useState,
} from "react";
import { useNavigate, useLocation } from "react-router-dom";
import { captureException } from "@sentry/react";
import { sleep } from "matrix-js-sdk/src/utils";
import { Trans, useTranslation } from "react-i18next";
import { logger } from "matrix-js-sdk/src/logger";
import { Button, Text } from "@vector-im/compound-web";

import { FieldRow, InputField, ErrorMessage } from "../input/Input";
import { useClientLegacy } from "../ClientContext";
import { useInteractiveRegistration } from "./useInteractiveRegistration";
import styles from "./LoginPage.module.css";
import Logo from "../icons/LogoLarge.svg?react";
import { LoadingView } from "../FullScreenView";
import { useRecaptcha } from "./useRecaptcha";
import { usePageTitle } from "../usePageTitle";
import { PosthogAnalytics } from "../analytics/PosthogAnalytics";
import { Config } from "../config/Config";
import { ExternalLink, Link } from "../button/Link";

export const RegisterPage: FC = () => {
  const { t } = useTranslation();
  usePageTitle(t("action.register"));

  const { loading, authenticated, passwordlessUser, client, setClient } =
    useClientLegacy();

  const confirmPasswordRef = useRef<HTMLInputElement>(null);
  const navigate = useNavigate();
  const location = useLocation();
  const [registering, setRegistering] = useState(false);
  const [error, setError] = useState<Error>();
  const [password, setPassword] = useState("");
  const [passwordConfirmation, setPasswordConfirmation] = useState("");
  const { recaptchaKey, register } = useInteractiveRegistration(client);
  const { execute, reset, recaptchaId } = useRecaptcha(recaptchaKey);

  const onSubmitRegisterForm = useCallback(
    (e: FormEvent<HTMLFormElement>) => {
      e.preventDefault();
      const data = new FormData(e.target as HTMLFormElement);
      const userName = data.get("userName") as string;
      const password = data.get("password") as string;
      const passwordConfirmation = data.get("passwordConfirmation") as string;

      if (password !== passwordConfirmation) return;

      const submit = async (): Promise<void> => {
        setRegistering(true);

        const recaptchaResponse = await execute();
        const [newClient, session] = await register(
          userName,
          password,
          userName,
          recaptchaResponse,
          passwordlessUser,
        );

        if (client && client?.groupCallEventHandler && passwordlessUser) {
          // Migrate the user's rooms
          for (const groupCall of client.groupCallEventHandler.groupCalls.values()) {
            const roomId = groupCall.room.roomId;

            try {
              await newClient.joinRoom(roomId);
            } catch (error) {
              // eslint-disable-next-line @typescript-eslint/ban-ts-comment
              // @ts-ignore
              if (error.errcode === "M_LIMIT_EXCEEDED") {
                // eslint-disable-next-line @typescript-eslint/ban-ts-comment
                // @ts-ignore
                await sleep(error.data.retry_after_ms);
                await newClient.joinRoom(roomId);
              } else {
                captureException(error);
                logger.error(`Couldn't join room ${roomId}`, error);
              }
            }
          }
        }

        setClient?.({ client: newClient, session });
        PosthogAnalytics.instance.eventSignup.cacheSignupEnd(new Date());
      };

      submit()
        .then(async () => {
          // eslint-disable-next-line @typescript-eslint/ban-ts-comment
          // @ts-ignore
          if (location.state?.from) {
            // eslint-disable-next-line @typescript-eslint/ban-ts-comment
            // @ts-ignore
            await navigate(location.state?.from);
          } else {
            await navigate("/");
          }
        })
        .catch((error) => {
          setError(error);
          setRegistering(false);
          reset();
        });
    },
    [
      register,
      location,
      navigate,
      passwordlessUser,
      reset,
      execute,
      client,
      setClient,
    ],
  );

  useEffect(() => {
    if (password && passwordConfirmation && password !== passwordConfirmation) {
      confirmPasswordRef.current?.setCustomValidity(
        t("register.passwords_must_match"),
      );
    } else {
      confirmPasswordRef.current?.setCustomValidity("");
    }
  }, [password, passwordConfirmation, t]);

  useEffect(() => {
    if (!loading && authenticated && !passwordlessUser && !registering) {
      navigate("/")?.catch((error) => {
        logger.error("Failed to navigate to /", error);
      });
    }
  }, [loading, navigate, authenticated, passwordlessUser, registering]);

  if (loading) {
    return <LoadingView />;
  } else {
    PosthogAnalytics.instance.eventSignup.cacheSignupStart(new Date());
  }

  return (
    <>
      <div className={styles.container}>
        <div className={styles.content}>
          <div className={styles.formContainer}>
            <Logo width="auto" height="auto" className={styles.logo} />
            <h2>{t("register_heading")}</h2>
            <form onSubmit={onSubmitRegisterForm}>
              <FieldRow>
                <InputField
                  type="text"
                  name="userName"
                  placeholder={t("common.username")}
                  label={t("common.username")}
                  autoCorrect="off"
                  autoCapitalize="none"
                  prefix="@"
                  suffix={`:${Config.defaultServerName()}`}
                  data-testid="register_username"
                />
              </FieldRow>
              <FieldRow>
                <InputField
                  required
                  name="password"
                  type="password"
                  onChange={(e: ChangeEvent<HTMLInputElement>): void =>
                    setPassword(e.target.value)
                  }
                  value={password}
                  placeholder={t("common.password")}
                  label={t("common.password")}
                  data-testid="register_password"
                />
              </FieldRow>
              <FieldRow>
                <InputField
                  required
                  type="password"
                  name="passwordConfirmation"
                  onChange={(e: ChangeEvent<HTMLInputElement>): void =>
                    setPasswordConfirmation(e.target.value)
                  }
                  value={passwordConfirmation}
                  placeholder={t("register_confirm_password_label")}
                  label={t("register_confirm_password_label")}
                  ref={confirmPasswordRef}
                  data-testid="register_confirm_password"
                />
              </FieldRow>
              <Text size="sm">
                <Trans i18nKey="recaptcha_caption">
                  This site is protected by ReCAPTCHA and the Google{" "}
                  <ExternalLink href="https://www.google.com/policies/privacy/">
                    Privacy Policy
                  </ExternalLink>{" "}
                  and{" "}
                  <ExternalLink href="https://policies.google.com/terms">
                    Terms of Service
                  </ExternalLink>{" "}
                  apply.
                  <br />
                  By clicking "Register", you agree to our{" "}
                  <ExternalLink href={Config.get().eula}>
                    End User Licensing Agreement (EULA)
                  </ExternalLink>
                </Trans>
              </Text>
              {error && (
                <FieldRow>
                  <ErrorMessage error={error} />
                </FieldRow>
              )}
              <FieldRow>
                <Button
                  type="submit"
                  disabled={registering}
                  data-testid="register_register"
                >
                  {registering
                    ? t("register.registering")
                    : t("action.register")}
                </Button>
              </FieldRow>
              <div id={recaptchaId} />
            </form>
          </div>
          <div className={styles.authLinks}>
            <Trans i18nKey="register_auth_links">
              <p>Already have an account?</p>
              <p>
                <Link to="/login">Log in</Link>
                {" Or "}
                <Link to="/">Access as a guest</Link>
              </p>
            </Trans>
          </div>
        </div>
      </div>
    </>
  );
};