import {
  Box,
  Card,
  Typography,
  Button,
  // Link,
  Container,
  Dialog,
  DialogContent,
  Zoom,
  Fade,
  Stepper,
  Step,
  StepLabel,
  IconButton,
  CircularProgress,
} from '@mui/material'
import CheckCircleIcon from '@mui/icons-material/CheckCircle'
import ArrowBackIcon from '@mui/icons-material/ArrowBack'
import LockResetIcon from '@mui/icons-material/LockReset'
import PhoneAndroidIcon from '@mui/icons-material/PhoneAndroid'
import VpnKeyIcon from '@mui/icons-material/VpnKey'
import { keyframes } from '@mui/system'
import { useEffect, useRef, useState } from 'react'
import MuiDynamicInput from '../../utills/MuiDynamicInput'
import axiosInstance from '../../api/axiosInstance'
import toast from 'react-hot-toast'
import { Link } from 'react-router-dom'
// Keyframe animations
const scaleIn = keyframes`
  0% { transform: scale(0); opacity: 0; }
  50% { transform: scale(1.2); }
  100% { transform: scale(1); opacity: 1; }
`

const pulse = keyframes`
  0% { box-shadow: 0 0 0 0 rgba(76, 175, 80, 0.4); }
  70% { box-shadow: 0 0 0 20px rgba(76, 175, 80, 0); }
  100% { box-shadow: 0 0 0 0 rgba(76, 175, 80, 0); }
`

const fadeInUp = keyframes`
  0% { opacity: 0; transform: translateY(20px); }
  100% { opacity: 1; transform: translateY(0); }
`

const shake = keyframes`
  0%, 100% { transform: translateX(0); }
  25% { transform: translateX(-5px); }
  75% { transform: translateX(5px); }
`

// Success Modal Component
function SuccessModal({ open, onClose, title, message }) {
  return (
    <Dialog
      open={open}
      onClose={onClose}
      TransitionComponent={Zoom}
      TransitionProps={{ timeout: 400 }}
      PaperProps={{
        sx: {
          borderRadius: 4,
          minWidth: { xs: 280, sm: 400 },
          overflow: 'visible',
        },
      }}
    >
      <DialogContent
        sx={{
          display: 'flex',
          flexDirection: 'column',
          alignItems: 'center',
          py: 5,
          px: 4,
          textAlign: 'center',
        }}
      >
        <Box
          sx={{
            width: 100,
            height: 100,
            borderRadius: '50%',
            backgroundColor: 'success.light',
            display: 'flex',
            alignItems: 'center',
            justifyContent: 'center',
            animation: `${scaleIn} 0.5s ease-out, ${pulse} 1.5s ease-out 0.5s`,
            mb: 3,
          }}
        >
          <CheckCircleIcon
            sx={{
              fontSize: 60,
              color: 'success.main',
              animation: `${scaleIn} 0.6s ease-out 0.2s both`,
            }}
          />
        </Box>

        <Fade in={open} timeout={800}>
          <Typography
            variant="h5"
            sx={{
              fontWeight: 700,
              color: 'success.main',
              mb: 1,
              animation: `${fadeInUp} 0.5s ease-out 0.3s both`,
            }}
          >
            {title}
          </Typography>
        </Fade>

        <Fade in={open} timeout={1000}>
          <Typography
            variant="body1"
            sx={{
              color: 'text.secondary',
              mb: 3,
              animation: `${fadeInUp} 0.5s ease-out 0.5s both`,
            }}
          >
            {message}
          </Typography>
        </Fade>

        <Fade in={open} timeout={1200}>
          <Button
            variant="contained"
            onClick={onClose}
            sx={{
              mt: 1,
              px: 5,
              py: 1.5,
              borderRadius: 50,
              backgroundColor: 'success.main',
              fontWeight: 600,
              textTransform: 'none',
              fontSize: '1rem',
              animation: `${fadeInUp} 0.5s ease-out 0.7s both`,
              '&:hover': { backgroundColor: 'success.dark' },
            }}
          >
            Back to Login
          </Button>
        </Fade>
      </DialogContent>
    </Dialog>
  )
}

// OTP Input Component
function OTPInput({ value, onChange, error, disabled }) {
  const inputRefs = useRef([])
  const otpLength = 4

  const handleChange = (index, e) => {
    const val = e.target.value
    if (!/^\d*$/.test(val)) return

    const newOtp = value.split('')
    newOtp[index] = val.slice(-1)
    const otpString = newOtp.join('')
    onChange({ target: { name: 'otp', value: otpString } })

    // Move to next input
    if (val && index < otpLength - 1) {
      inputRefs.current[index + 1]?.focus()
    }
  }

  const handleKeyDown = (index, e) => {
    if (e.key === 'Backspace' && !value[index] && index > 0) {
      inputRefs.current[index - 1]?.focus()
    }
  }

  const handlePaste = (e) => {
    e.preventDefault()
    const pastedData = e.clipboardData.getData('text').slice(0, otpLength)
    if (/^\d+$/.test(pastedData)) {
      onChange({ target: { name: 'otp', value: pastedData } })
      const focusIndex = Math.min(pastedData.length, otpLength - 1)
      inputRefs.current[focusIndex]?.focus()
    }
  }

  return (
    <Box sx={{ mb: 2 }}>
      <Box
        sx={{
          display: 'flex',
          gap: { xs: 1, sm: 1.5 },
          justifyContent: 'center',
          animation: error ? `${shake} 0.5s ease-out` : 'none',
        }}
      >
        {Array.from({ length: otpLength }).map((_, index) => (
          <input
            key={index}
            ref={(el) => (inputRefs.current[index] = el)}
            type="text"
            inputMode="numeric"
            maxLength={1}
            value={value[index] || ''}
            onChange={(e) => handleChange(index, e)}
            onKeyDown={(e) => handleKeyDown(index, e)}
            onPaste={handlePaste}
            disabled={disabled}
            style={{
              width: '45px',
              height: '55px',
              textAlign: 'center',
              fontSize: '24px',
              fontWeight: 600,
              border: `2px solid ${error ? '#f44336' : value[index] ? '#4CAF50' : '#ddd'}`,
              borderRadius: '12px',
              outline: 'none',
              transition: 'all 0.2s',
              backgroundColor: disabled ? '#f5f5f5' : 'white',
            }}
            onFocus={(e) => {
              e.target.style.borderColor = '#4CAF50'
              e.target.style.boxShadow = '0 0 0 3px rgba(76, 175, 80, 0.2)'
            }}
            onBlur={(e) => {
              e.target.style.borderColor = value[index] ? '#4CAF50' : '#ddd'
              e.target.style.boxShadow = 'none'
            }}
          />
        ))}
      </Box>
      {error && (
        <Typography
          color="error"
          variant="caption"
          sx={{ display: 'block', textAlign: 'center', mt: 1 }}
        >
          {error}
        </Typography>
      )}
    </Box>
  )
}


const ForgotPassworForm = () => {

     const steps = ['Enter Mobile', 'Verify OTP', 'Reset Password']

  const [activeStep, setActiveStep] = useState(0)
  const [loading, setLoading] = useState(false)
  const [successModal, setSuccessModal] =useState(false)
  const [resendTimer, setResendTimer] = useState(0)

  const [formData, setFormData] = useState({
    mobile: '',
    otp: '',
    newPassword: '',
    confirmPassword: '',
  })

  const [errors, setErrors] = useState({})

  // Resend OTP Timer
 useEffect(() => {
    let interval
    if (resendTimer > 0) {
      interval = setInterval(() => {
        setResendTimer((prev) => prev - 1)
      }, 1000)
    }
    return () => clearInterval(interval)
  }, [resendTimer])

  const handleChange = (e) => {
    const { name, value } = e.target
    setFormData((prev) => ({ ...prev, [name]: value }))
    if (errors[name]) {
      setErrors((prev) => ({ ...prev, [name]: '' }))
    }
  }

  // Step 1: Validate Mobile
  const validateMobile = () => {
    const newErrors = {}
    if (!formData.mobile) {
      newErrors.mobile = 'Mobile number is required'
    } else if (!/^\d{10}$/.test(formData.mobile)) {
      newErrors.mobile = 'Enter a valid 10-digit mobile number'
    }
    setErrors(newErrors)
    return Object.keys(newErrors).length === 0
  }

  // Step 2: Validate OTP
  const validateOTP = () => {
    const newErrors = {}
    if (!formData.otp || formData.otp.length !== 4) {
      newErrors.otp = 'Please enter the 6-digit OTP'
    }
    setErrors(newErrors)
    return Object.keys(newErrors).length === 0
  }

  // Step 3: Validate Password
  const validatePassword = () => {
    const newErrors = {}
    if (!formData.newPassword) {
      newErrors.newPassword = 'New password is required'
    } else if (formData.newPassword.length < 8) {
      newErrors.newPassword = 'Password must be at least 8 characters'
    } else if (!/(?=.*[a-z])(?=.*[A-Z])(?=.*\d)/.test(formData.newPassword)) {
      newErrors.newPassword = 'Must include uppercase, lowercase, and number'
    }

    if (!formData.confirmPassword) {
      newErrors.confirmPassword = 'Please confirm your password'
    } else if (formData.newPassword !== formData.confirmPassword) {
      newErrors.confirmPassword = 'Passwords do not match'
    }

    setErrors(newErrors)
    return Object.keys(newErrors).length === 0
  }

  // Submit Mobile
  const handleMobileSubmit = async () => {
    if (!validateMobile()) return

    setLoading(true)
    try {
      const response = await axiosInstance.post(`/forgot_password_send_otp?mobile=${formData.mobile}`)
      toast.success(response.data?.message || "OTP sent successfully")
      setLoading(false)
      setActiveStep(1)
      setResendTimer(120) // 2 minutes timer
    } catch (error) {
      setLoading(false)
      console.error("Forgot password error:", error)
      const errorMessage = error.response?.data?.message || error.response?.data?.error || "Failed to send OTP"
      toast.error(errorMessage)
    }
  }

  // Verify OTP
  const handleOTPSubmit = async () => {
    if (!validateOTP()) return

    setLoading(true)
    try {
      const response = await axiosInstance.post(`/forgot_password_verify_otp?mobile=${formData.mobile}&otp=${formData.otp}`)
      toast.success(response.data?.message || "OTP Verified Successfully")
      setLoading(false)
      setActiveStep(2)
    } catch (error) {
      setLoading(false)
      console.error("OTP verification error:", error)
      const errorMessage = error.response?.data?.message || error.response?.data?.error || "Invalid OTP"
      toast.error(errorMessage)
    }
  }

  // Resend OTP
  const handleResendOTP = () => {
    handleMobileSubmit()
  }

  // Submit New Password
  const handlePasswordSubmit = async () => {
    if (!validatePassword()) return

    setLoading(true)
    try {
      const encodedPassword = encodeURIComponent(formData.newPassword)
      const response = await axiosInstance.post(`/forgot_password_update?mobile=${formData.mobile}&otp=${formData.otp}&password=${encodedPassword}`)
      toast.success(response.data?.message || "Password updated successfully")
      setLoading(false)
      setSuccessModal(true)
    } catch (error) {
      setLoading(false)
      console.error("Password update error:", error)
      const errorMessage = error.response?.data?.message || error.response?.data?.error || "Failed to update password"
      toast.error(errorMessage)
    }
  }

  const handleBack = () => {
    if (activeStep > 0) {
      setActiveStep((prev) => prev - 1)
      setErrors({})
    }
  }

  const handleSuccessClose = () => {
    setSuccessModal(false)
    setActiveStep(0)
    setFormData({ mobile: '', otp: '', newPassword: '', confirmPassword: '' })
    // Navigate to login page
    console.log('Navigate to login...')
  }

  const formatTime = (seconds) => {
    const mins = Math.floor(seconds / 60)
    const secs = seconds % 60
    return `${mins}:${secs.toString().padStart(2, '0')}`
  }

  // Render step icon
  const getStepIcon = (step) => {
    switch (step) {
      case 0:
        return <PhoneAndroidIcon />
      case 1:
        return <VpnKeyIcon />
      case 2:
        return <LockResetIcon />
      default:
        return null
    }
  }


  
  return (
    <>
        <Container maxWidth="sm" sx={{ py: 4, minHeight: '100vh' }}>
      <Card
        elevation={8}
        sx={{
          borderRadius: 4,
          overflow: 'hidden',
        }}
      >
        {/* Header */}
        <Box
          sx={{
            background: 'linear-gradient(135deg, #034E08 0%, #034E08 100%)',
            py: 3,
            px: 4,
            position: 'relative',
          }}
        >
          {activeStep > 0 && (
            <IconButton
              onClick={handleBack}
              sx={{
                position: 'absolute',
                left: 16,
                top: '50%',
                transform: 'translateY(-50%)',
                color: 'white',
              }}
            >
              <ArrowBackIcon />
            </IconButton>
          )}
          <Typography
            variant="h5"
            component="h1"
            sx={{
              color: 'white',
              fontWeight: 600,
              textAlign: 'center',
            }}
          >
            Forgot Password
          </Typography>
        </Box>

        {/* Stepper */}
        <Box sx={{ px: { xs: 2, sm: 4 }, pt: 3 }}>
          <Stepper activeStep={activeStep} alternativeLabel>
            {steps.map((label, index) => (
              <Step key={label}>
                <StepLabel
                  StepIconProps={{
                    sx: {
                      '&.Mui-active': { color: '#034E08' },
                      '&.Mui-completed': { color: '#034E08' },
                    },
                  }}
                >
                  <Typography
                    variant="caption"
                    sx={{
                      display: { xs: 'none', sm: 'block' },
                      fontWeight: activeStep === index ? 600 : 400,
                    }}
                  >
                    {label}
                  </Typography>
                </StepLabel>
              </Step>
            ))}
          </Stepper>
        </Box>

        {/* Form Content */}
        <Box sx={{ p: 4 }}>
          {/* Step 1: Mobile */}
          {activeStep === 0 && (
            <Fade in={activeStep === 0}>
              <Box>
                <Box
                  sx={{
                    display: 'flex',
                    justifyContent: 'center',
                    mb: 3,
                  }}
                >
                  <Box
                    sx={{
                      width: 80,
                      height: 80,
                      borderRadius: '50%',
                      backgroundColor: 'rgba(76, 175, 80, 0.1)',
                      display: 'flex',
                      alignItems: 'center',
                      justifyContent: 'center',
                    }}
                  >
                    <PhoneAndroidIcon sx={{ fontSize: 40, color: '#A70710' }} />
                  </Box>
                </Box>

                <Typography
                  variant="body1"
                  sx={{ textAlign: 'center', mb: 3, color: 'text.secondary' }}
                >
                  Enter your mobile number and we'll send you an OTP to reset
                  your password.
                </Typography>

                <MuiDynamicInput
                  type="tel"
                  name="mobile"
                  label="Mobile Number"
                  value={formData.mobile}
                  onChange={handleChange}
                  error={errors.mobile}
                  inputProps={{ maxLength: 10 }}
                  autoFocus
                  required
                />

                <Button
                  fullWidth
                  variant="contained"
                  onClick={handleMobileSubmit}
                  disabled={loading}
                  sx={{
                    mt: 2,
                    py: 1.5,
                    borderRadius: 50,
                    backgroundColor: '#A70710',
                    fontSize: '1rem',
                    fontWeight: 600,
                    '&:hover': { backgroundColor: '#A70710' },
                    '&:disabled': { backgroundColor: '#A70710', color: 'white' },
                  }}
                >
                  {loading ? (
                    <CircularProgress size={24} sx={{ color: 'white' }} />
                  ) : (
                    'Send OTP'
                  )}
                </Button>

                <Box sx={{ mt: 3, textAlign: 'center' }}>
                  <Link
                    to="/login"
                    sx={{
                      color: '#A70710',
                      fontWeight: 500,
                      textDecoration: 'none',
                      '&:hover': { textDecoration: 'underline' },
                    }}
                  >
                    Back to Login
                  </Link>
                </Box>
              </Box>
            </Fade>
          )}

          {/* Step 2: OTP Verification */}
          {activeStep === 1 && (
            <Fade in={activeStep === 1}>
              <Box>
                <Box
                  sx={{
                    display: 'flex',
                    justifyContent: 'center',
                    mb: 3,
                  }}
                >
                  <Box
                    sx={{
                      width: 80,
                      height: 80,
                      borderRadius: '50%',
                      backgroundColor: 'rgba(76, 175, 80, 0.1)',
                      display: 'flex',
                      alignItems: 'center',
                      justifyContent: 'center',
                    }}
                  >
                    <VpnKeyIcon sx={{ fontSize: 40, color: '#4CAF50' }} />
                  </Box>
                </Box>

                <Typography
                  variant="body1"
                  sx={{ textAlign: 'center', mb: 1, color: 'text.secondary' }}
                >
                  We've sent a 4-digit OTP to
                </Typography>
                <Typography
                  variant="body1"
                  sx={{
                    textAlign: 'center',
                    mb: 3,
                    fontWeight: 600,
                    color: '#4CAF50',
                  }}
                >
                  {formData.mobile}
                </Typography>

                <OTPInput
                  value={formData.otp}
                  onChange={handleChange}
                  error={errors.otp}
                  disabled={loading}
                />

                {/* Timer and Resend */}
                <Box sx={{ textAlign: 'center', mb: 3 }}>
                  {resendTimer > 0 ? (
                    <Typography variant="body2" color="text.secondary">
                      Resend OTP in{' '}
                      <Typography
                        component="span"
                        sx={{ fontWeight: 600, color: '#FF9800' }}
                      >
                        {formatTime(resendTimer)}
                      </Typography>
                    </Typography>
                  ) : (
                    <Link
                      component="button"
                      onClick={handleResendOTP}
                      sx={{
                        color: '#FF9800',
                        fontWeight: 600,
                        textDecoration: 'none',
                        '&:hover': { textDecoration: 'underline' },
                      }}
                    >
                      Resend OTP
                    </Link>
                  )}
                </Box>

                <Button
                  fullWidth
                  variant="contained"
                  onClick={handleOTPSubmit}
                  disabled={loading || formData.otp.length !== 4}
                  sx={{
                    py: 1.5,
                    borderRadius: 50,
                    backgroundColor: '#FF9800',
                    fontSize: '1rem',
                    fontWeight: 600,
                    '&:hover': { backgroundColor: '#F57C00' },
                    '&:disabled': { backgroundColor: '#FFB74D', color: 'white' },
                  }}
                >
                  {loading ? (
                    <CircularProgress size={24} sx={{ color: 'white' }} />
                  ) : (
                    'Verify OTP'
                  )}
                </Button>
              </Box>
            </Fade>
          )}

          {/* Step 3: Reset Password */}
          {activeStep === 2 && (
            <Fade in={activeStep === 2}>
              <Box>
                <Box
                  sx={{
                    display: 'flex',
                    justifyContent: 'center',
                    mb: 3,
                  }}
                >
                  <Box
                    sx={{
                      width: 80,
                      height: 80,
                      borderRadius: '50%',
                      backgroundColor: 'rgba(76, 175, 80, 0.1)',
                      display: 'flex',
                      alignItems: 'center',
                      justifyContent: 'center',
                    }}
                  >
                    <LockResetIcon sx={{ fontSize: 40, color: '#4CAF50' }} />
                  </Box>
                </Box>

                <Typography
                  variant="body1"
                  sx={{ textAlign: 'center', mb: 3, color: 'text.secondary' }}
                >
                  Create a strong password with at least 8 characters including
                  uppercase, lowercase, and numbers.
                </Typography>

                <MuiDynamicInput
                  type="password"
                  name="newPassword"
                  label="New Password"
                  value={formData.newPassword}
                  onChange={handleChange}
                  error={errors.newPassword}
                  showPasswordToggle
                  required
                />

                <MuiDynamicInput
                  type="password"
                  name="confirmPassword"
                  label="Confirm Password"
                  value={formData.confirmPassword}
                  onChange={handleChange}
                  error={errors.confirmPassword}
                  showPasswordToggle
                  required
                />

                <Button
                  fullWidth
                  variant="contained"
                  onClick={handlePasswordSubmit}
                  disabled={loading}
                  sx={{
                    mt: 2,
                    py: 1.5,
                    borderRadius: 50,
                    backgroundColor: '#FF9800',
                    fontSize: '1rem',
                    fontWeight: 600,
                    '&:hover': { backgroundColor: '#F57C00' },
                    '&:disabled': { backgroundColor: '#FFB74D', color: 'white' },
                  }}
                >
                  {loading ? (
                    <CircularProgress size={24} sx={{ color: 'white' }} />
                  ) : (
                    'Reset Password'
                  )}
                </Button>
              </Box>
            </Fade>
          )}
        </Box>
      </Card>

      {/* Success Modal */}
      <SuccessModal
        open={successModal}
        onClose={handleSuccessClose}
        title="Password Reset Successful!"
        message="Your password has been reset successfully. You can now login with your new password."
      />
    </Container>
    </>
  )
}

export default ForgotPassworForm
