import { useEffect, useState } from 'react';
import { Box, Typography } from '@mui/material';
import { useTranslation } from 'react-i18next';
import Logo from '@/components/Logo';
import { PersonalInfoFields } from '../components/UserCompletionForm/PersonalInfoFields';
import { PasswordSection } from '../components/UserCompletionForm/PasswordSection';
import { EmailSection } from '../components/UserCompletionForm/EmailSection';
import { SubmitSection } from '../components/UserCompletionForm/SubmitSection';
import { useToast } from '@rkheftan/harmony-ui';
import { toLocaleDigits } from '../../../utils/persianDigit';
import i18n from '@/config/i18n';
import { Gender } from '../types/settingForm';
import { useApi } from '@/hooks/useApi';
import {
  sendEmailOtpApi,
  confirmEmailOtpApi,
  completeUserInformationApi,
} from '../api/userCompletion';
import { containsSymbol } from '@/utils/regexes/containsSymbol';
import { least8Chars } from '@/utils/regexes/least8Chars';
import { containsNumber } from '@/utils/regexes/containsNumber';
import { hasUpperAndLowerLetter } from '@/utils/regexes/hasUpperAndLowerLetter';
import { isEmail } from '@/utils/regexes/isEmail';
import { useNavigate, useSearchParams } from 'react-router-dom';

export function UserCompletionPage() {
  const [params] = useSearchParams();
  const { t } = useTranslation('completionForm');
  const showToast = useToast();
  const navigate = useNavigate();

  const [firstName, setFirstName] = useState('');
  const [lastName, setLastName] = useState('');
  const [nationalId, setNationalId] = useState('');
  const [birthDate, setBirthDate] = useState<Date | null>(null);
  const [sex, setSex] = useState<Gender>(Gender.Female);
  const [country, setCountry] = useState('');
  const [showPasswordSection, setShowPasswordSection] = useState(false);
  const [password, setPassword] = useState('');
  const [confirmPassword, setConfirmPassword] = useState('');
  const [showEmail, setShowEmail] = useState(false);
  const [email, setEmail] = useState('');
  const [verificationCode, setVerificationCode] = useState('');

  const [codeSent, setCodeSent] = useState(false);
  const [buttonState, setButtonState] = useState<'default' | 'counting'>(
    'default',
  );
  const [countdown, setCountdown] = useState(0);
  const [emailVerified, setEmailVerified] = useState(false);
  const [showPasswordValidations, setShowPasswordValidations] = useState(false);

  const hasNumber = containsNumber(password);
  const hasMinLength = least8Chars(password);
  const hasUpperAndLower = hasUpperAndLowerLetter(password);
  const hasSpecialChar = containsSymbol(password);
  const validPassword =
    hasNumber && hasMinLength && hasUpperAndLower && hasSpecialChar;

  const matchPassword = password === confirmPassword;
  const correctEmail = isEmail(email);

  const { execute: sendCode, data: sendCodeData } = useApi(sendEmailOtpApi);

  const {
    execute: verifyCode,
    data: verifyCodeData,
    loading: isVerifyingCode,
  } = useApi(confirmEmailOtpApi);

  const {
    execute: submitForm,
    data: submitData,
    loading: isSubmitting,
    error: submitError,
  } = useApi(completeUserInformationApi);

  const getErrorMessage = (error: unknown): string | null => {
    if (!error) return null;
    if (error instanceof Error) return error.message;
    return String(error);
  };

  useEffect(() => {
    if (sendCodeData) {
      if (sendCodeData.data.success) {
        showToast({
          message:
            sendCodeData.data.message || t('completion.successfullCodeSent'),
          severity: 'success',
        });
        setCodeSent(true);
        setButtonState('counting');
        setCountdown(120);
      } else {
        showToast({
          message: sendCodeData.data.message || t('completion.problem'),
          severity: 'error',
        });
      }
    }
  }, [sendCodeData, showToast, t]);

  useEffect(() => {
    if (verifyCodeData) {
      if (verifyCodeData.data.success) {
        setEmailVerified(true);
        showToast({
          message: verifyCodeData.data.message || t('completion.codeVerified'),
          severity: 'success',
        });
      } else {
        showToast({
          message: verifyCodeData.data.message || t('completion.invalidCode'),
          severity: 'error',
        });
        setEmailVerified(false);
      }
    }
  }, [verifyCodeData, showToast, t]);

  useEffect(() => {
    if (submitData) {
      showToast({
        message:
          submitData.data.message ||
          t(
            submitData.data.success
              ? 'completion.submitSuccess'
              : 'completion.submitError',
          ),
        severity: submitData.data.success ? 'success' : 'error',
      });

      if (submitData.data.success) {
        const returnUrl = params.get('returnUrl');

        navigate(
          returnUrl
            ? `/account-created?returnUrl=${returnUrl}`
            : '`/account-created',
        );
      }
    } else if (submitError) {
      showToast({
        message: getErrorMessage(submitError) || t('completion.problem'),
        severity: 'error',
      });
    }
  }, [submitData, submitError, showToast, t, navigate, params]);

  useEffect(() => {
    setShowPasswordValidations(password ? !validPassword : false);
  }, [password, validPassword]);

  useEffect(() => {
    let timer: NodeJS.Timeout;
    if (buttonState === 'counting' && countdown > 0) {
      timer = setInterval(() => {
        setCountdown((prev) => {
          if (prev <= 1) {
            setButtonState('default');
            clearInterval(timer);
            return 0;
          }
          return prev - 1;
        });
      }, 1000);
    }
    return () => clearInterval(timer);
  }, [buttonState, countdown]);

  const handleSendCode = () => {
    sendCode({ email });
  };

  const handleVerifyCode = () => {
    if (!verificationCode.trim()) {
      showToast({
        message: 'Please enter the verification code',
        severity: 'warning',
      });
      return;
    }
    verifyCode({ email, otpCode: verificationCode });
  };

  const handleSubmit = () => {
    submitForm({
      firstName,
      lastName,
      gender: sex,
      nationalId,
      savePassword: showPasswordSection,
      password: showPasswordSection ? password : undefined,
      saveEmail: showEmail,
      email: showEmail ? email : undefined,
      birthDate,
      country,
    });
  };

  const getButtonLabel = () => {
    if (buttonState === 'counting') {
      const m = String(Math.floor(countdown / 60)).padStart(2, '0');
      const s = String(countdown % 60).padStart(2, '0');
      return toLocaleDigits(`${m}:${s}`, i18n.language);
    }
    return t('completion.vericationCodeButton');
  };

  const handleEditEmail = () => {
    setButtonState('default');
    setCodeSent(false);
    setEmailVerified(false);
    setVerificationCode('');
  };

  return (
    <Box
      sx={{
        backgroundColor: 'background.default',
        minHeight: '100vh',
        display: 'flex',
        flexDirection: 'column',
        justifyContent: 'center',
        alignItems: 'center',
        p: { xs: 1, sm: 2, md: 3 },
      }}
    >
      <Box sx={{ mb: 2 }}>
        <Logo />
      </Box>
      <Box
        sx={{
          width: '100%',
          maxWidth: 730,
          backgroundColor: 'background.paper',
          border: '1px solid #ccc',
          display: 'flex',
          flexDirection: 'column',
          gap: 2,
          px: { xs: 2, sm: 4, md: 6 },
          py: { xs: 3, sm: 4 },
        }}
      >
        <Box sx={{ display: 'flex', flexDirection: 'column', gap: 1 }}>
          <Typography variant="h5" color="text.primary">
            {t('completion.title')}
          </Typography>
          <Typography variant="body2" color="text.secondary">
            {t('completion.description')}
          </Typography>
        </Box>

        <PersonalInfoFields
          firstName={firstName}
          setFirstName={setFirstName}
          lastName={lastName}
          setLastName={setLastName}
          nationalId={nationalId}
          setNationalId={setNationalId}
          birthDate={birthDate}
          setBirthDate={setBirthDate}
          sex={sex}
          setSex={setSex}
          country={country}
          setCountry={setCountry}
        />

        <PasswordSection
          showPasswordSection={showPasswordSection}
          setShowPasswordSection={setShowPasswordSection}
          password={password}
          setPassword={setPassword}
          confirmPassword={confirmPassword}
          setConfirmPassword={setConfirmPassword}
          matchPassword={matchPassword}
          hasNumber={hasNumber}
          hasMinLength={hasMinLength}
          hasUpperAndLower={hasUpperAndLower}
          hasSpecialChar={hasSpecialChar}
          validPassword={validPassword}
          showValidations={showPasswordValidations}
        />

        <EmailSection
          showEmail={showEmail}
          setShowEmail={setShowEmail}
          email={email}
          setEmail={setEmail}
          correctEmail={correctEmail}
          codeSent={codeSent}
          verificationCode={verificationCode}
          setVerificationCode={setVerificationCode}
          buttonState={buttonState}
          getButtonLabel={getButtonLabel}
          handleSendCode={handleSendCode}
          handleVerifyCode={handleVerifyCode}
          emailVerified={emailVerified}
          loading={isVerifyingCode}
          handleEditEmail={handleEditEmail}
        />

        <SubmitSection
          onSubmit={handleSubmit}
          loading={isSubmitting}
          error={getErrorMessage(submitError)}
          success={!!submitData?.data.success}
        />
      </Box>
    </Box>
  );
}