import React, { FC, useEffect, useState } from "react";
import { observer } from "mobx-react";
import { useSearchParams } from "next/navigation";
import { useTranslation } from "@plane/i18n";
import { IEmailCheckData } from "@plane/types";
// components
import {
  AuthHeader,
  AuthBanner,
  AuthEmailForm,
  AuthPasswordForm,
  OAuthOptions,
  TermsAndConditions,
  AuthUniqueCodeForm,
} from "@/components/account";
// helpers
import {
  EAuthModes,
  EAuthSteps,
  EAuthenticationErrorCodes,
  EErrorAlertType,
  TAuthErrorInfo,
  authErrorHandler,
} from "@/helpers/authentication.helper";
// hooks
import { useInstance } from "@/hooks/store";
import { useAppRouter } from "@/hooks/use-app-router";
// services
import { AuthService } from "@/services/auth.service";

const authService = new AuthService();

type TAuthRoot = {
  authMode: EAuthModes;
};

export const AuthRoot: FC<TAuthRoot> = observer((props) => {
  //router
  const router = useAppRouter();
  const searchParams = useSearchParams();
  // query params
  const emailParam = searchParams.get("email");
  const invitation_id = searchParams.get("invitation_id");
  const workspaceSlug = searchParams.get("slug");
  const error_code = searchParams.get("error_code");
  const nextPath = searchParams.get("next_path");
  // props
  const { authMode: currentAuthMode } = props;
  // states
  const [authMode, setAuthMode] = useState<EAuthModes | undefined>(undefined);
  const [authStep, setAuthStep] = useState<EAuthSteps>(EAuthSteps.EMAIL);
  const [email, setEmail] = useState(emailParam ? emailParam.toString() : "");
  const [errorInfo, setErrorInfo] = useState<TAuthErrorInfo | undefined>(undefined);
  const [isExistingEmail, setIsExistingEmail] = useState(false);
  // plane hooks
  const { t } = useTranslation();
  // hooks
  const { config } = useInstance();

  useEffect(() => {
    if (!authMode && currentAuthMode) setAuthMode(currentAuthMode);
  }, [currentAuthMode, authMode]);

  useEffect(() => {
    if (error_code && authMode) {
      const errorhandler = authErrorHandler(error_code?.toString() as EAuthenticationErrorCodes);
      if (errorhandler) {
        // password error handler
        if ([EAuthenticationErrorCodes.AUTHENTICATION_FAILED_SIGN_UP].includes(errorhandler.code)) {
          setAuthMode(EAuthModes.SIGN_UP);
          setAuthStep(EAuthSteps.PASSWORD);
        }
        if ([EAuthenticationErrorCodes.AUTHENTICATION_FAILED_SIGN_IN].includes(errorhandler.code)) {
          setAuthMode(EAuthModes.SIGN_IN);
          setAuthStep(EAuthSteps.PASSWORD);
        }
        // magic_code error handler
        if (
          [
            EAuthenticationErrorCodes.INVALID_MAGIC_CODE_SIGN_UP,
            EAuthenticationErrorCodes.INVALID_EMAIL_MAGIC_SIGN_UP,
            EAuthenticationErrorCodes.EXPIRED_MAGIC_CODE_SIGN_UP,
            EAuthenticationErrorCodes.EMAIL_CODE_ATTEMPT_EXHAUSTED_SIGN_UP,
          ].includes(errorhandler.code)
        ) {
          setAuthMode(EAuthModes.SIGN_UP);
          setAuthStep(EAuthSteps.UNIQUE_CODE);
        }
        if (
          [
            EAuthenticationErrorCodes.INVALID_MAGIC_CODE_SIGN_IN,
            EAuthenticationErrorCodes.INVALID_EMAIL_MAGIC_SIGN_IN,
            EAuthenticationErrorCodes.EXPIRED_MAGIC_CODE_SIGN_IN,
            EAuthenticationErrorCodes.EMAIL_CODE_ATTEMPT_EXHAUSTED_SIGN_IN,
          ].includes(errorhandler.code)
        ) {
          setAuthMode(EAuthModes.SIGN_IN);
          setAuthStep(EAuthSteps.UNIQUE_CODE);
        }

        setErrorInfo(errorhandler);
      }
    }
  }, [error_code, authMode]);

  const isSMTPConfigured = config?.is_smtp_configured || false;

  // submit handler- email verification
  const handleEmailVerification = async (data: IEmailCheckData) => {
    setEmail(data.email);
    setErrorInfo(undefined);
    await authService
      .emailCheck(data)
      .then(async (response) => {
        if (response.existing) {
          if (currentAuthMode === EAuthModes.SIGN_UP) setAuthMode(EAuthModes.SIGN_IN);
          if (response.status === "MAGIC_CODE") {
            setAuthStep(EAuthSteps.UNIQUE_CODE);
            generateEmailUniqueCode(data.email);
          } else if (response.status === "CREDENTIAL") {
            setAuthStep(EAuthSteps.PASSWORD);
          }
        } else {
          if (currentAuthMode === EAuthModes.SIGN_IN) setAuthMode(EAuthModes.SIGN_UP);
          if (response.status === "MAGIC_CODE") {
            setAuthStep(EAuthSteps.UNIQUE_CODE);
            generateEmailUniqueCode(data.email);
          } else if (response.status === "CREDENTIAL") {
            setAuthStep(EAuthSteps.PASSWORD);
          }
        }
        setIsExistingEmail(response.existing);
      })
      .catch((error) => {
        const errorhandler = authErrorHandler(error?.error_code?.toString(), data?.email || undefined);
        if (errorhandler?.type) setErrorInfo(errorhandler);
      });
  };

  const handleEmailClear = () => {
    setAuthMode(currentAuthMode);
    setErrorInfo(undefined);
    setEmail("");
    setAuthStep(EAuthSteps.EMAIL);
    router.push(currentAuthMode === EAuthModes.SIGN_IN ? `/` : "/sign-up");
  };

  // generating the unique code
  const generateEmailUniqueCode = async (email: string): Promise<{ code: string } | undefined> => {
    if (!isSMTPConfigured) return;
    const payload = { email: email };
    return await authService
      .generateUniqueCode(payload)
      .then(() => ({ code: "" }))
      .catch((error) => {
        const errorhandler = authErrorHandler(error?.error_code.toString());
        if (errorhandler?.type) setErrorInfo(errorhandler);
        throw error;
      });
  };

  if (!authMode) return <></>;
  return (
    <div className="relative flex flex-col space-y-6">
      <AuthHeader
        workspaceSlug={workspaceSlug?.toString() || undefined}
        invitationId={invitation_id?.toString() || undefined}
        invitationEmail={email || undefined}
        authMode={authMode}
        currentAuthStep={authStep}
      >
        {errorInfo && errorInfo?.type === EErrorAlertType.BANNER_ALERT && (
          <AuthBanner bannerData={errorInfo} handleBannerData={(value) => setErrorInfo(value)} />
        )}
        {authStep === EAuthSteps.EMAIL && <AuthEmailForm defaultEmail={email} onSubmit={handleEmailVerification} />}
        {authStep === EAuthSteps.UNIQUE_CODE && (
          <AuthUniqueCodeForm
            mode={authMode}
            email={email}
            isExistingEmail={isExistingEmail}
            handleEmailClear={handleEmailClear}
            generateEmailUniqueCode={generateEmailUniqueCode}
            nextPath={nextPath || undefined}
          />
        )}
        {authStep === EAuthSteps.PASSWORD && (
          <AuthPasswordForm
            mode={authMode}
            isSMTPConfigured={isSMTPConfigured}
            email={email}
            handleEmailClear={handleEmailClear}
            handleAuthStep={(step: EAuthSteps) => {
              if (step === EAuthSteps.UNIQUE_CODE) generateEmailUniqueCode(email);
              setAuthStep(step);
            }}
            nextPath={nextPath || undefined}
          />
        )}
        <OAuthOptions isSignUp={authMode === EAuthModes.SIGN_UP} />
        <TermsAndConditions isSignUp={authMode === EAuthModes.SIGN_UP} />
      </AuthHeader>
    </div>
  );
});
