import React, { useState, useEffect } from 'react';
import {
  Drawer,
  Box,
  Typography,
  TextField,
  Button,
  Alert,
  IconButton,
  LinearProgress
} from '@mui/material';
import CloseIcon from '@mui/icons-material/Close';
import { encrypt } from '@/app/utils/encryption';
import { getPasswordStrength } from '@/app/utils/passwordStrength';
import { useAuth } from '@/context/AuthContext';
import Cookies from 'js-cookie';

const ChangePasswordDrawer = ({
  open,
  onClose
}: {
  open: boolean;
  onClose: () => void;
}) => {
  const { username, authToken } = useAuth();
//console.log('🧪 username:', username);
//console.log('🧪 authToken:', authToken);

  const [currentPassword, setCurrentPassword] = useState('');
  const [newPassword, setNewPassword] = useState('');
  const [confirmPassword, setConfirmPassword] = useState('');
  const [message, setMessage] = useState('');
  const [error, setError] = useState('');
  

  const strength = getPasswordStrength(newPassword);
  const strengthValue = strength === 'Weak' ? 30 : strength === 'Medium' ? 60 : 100;


  useEffect(() => {
    if (!open) resetForm();
  }, [open]);

  const resetForm = () => {
    setCurrentPassword('');
    setNewPassword('');
    setConfirmPassword('');
    setMessage('');
    setError('');
  };

  const handleSubmit = async (e: React.FormEvent) => {
    e.preventDefault();
    setMessage('');
    setError('');
  
    if (!username) {
      setError('User not authenticated.');
      return;
    }
    
  
    if (newPassword !== confirmPassword) {
      setError('New passwords do not match.');
      return;
    }
  
    try {
      const res = await fetch('/api/auth/change-password', {
        method: 'PUT',
        headers: {
          'Content-Type': 'application/json',
        },
        credentials: 'include',
        body: JSON.stringify({
          currentPassword: encrypt(currentPassword),
          newPassword: encrypt(newPassword),
        }),
      });
  
      const text = await res.text();
      if (res.ok) {
        setMessage(text);
      } else {
        setError(text);
      }
    } catch (err) {
      setError('An unexpected error occurred.');
    }
  };
  

  return (
    <Drawer anchor="left" open={open} onClose={onClose} transitionDuration={300}>
      <Box sx={{ width: 350, p: 3 }}>
        <Box sx={{ display: 'flex', justifyContent: 'space-between', mb: 2 }}>
          <Typography variant="h6">Change Password</Typography>
          <IconButton onClick={onClose}>
            <CloseIcon />
          </IconButton>
        </Box>

        <form onSubmit={handleSubmit}>
          <TextField
            type="password"
            label="Current Password"
            fullWidth
            margin="normal"
            value={currentPassword}
            onChange={(e) => setCurrentPassword(e.target.value)}
            required
          />

          <TextField
            type="password"
            label="New Password"
            fullWidth
            margin="normal"
            value={newPassword}
            onChange={(e) => setNewPassword(e.target.value)}
            required
          />

          {/* Password Strength Bar */}
          <Box sx={{ mt: 1 }}>
            <Typography variant="caption">Strength: {strength}</Typography>
            <LinearProgress
              variant="determinate"
              value={strengthValue}
              color={
                strength === 'Strong'
                  ? 'success'
                  : strength === 'Medium'
                  ? 'warning'
                  : 'error'
              }
              sx={{ height: 6, borderRadius: 2, mt: 0.5 }}
            />
          </Box>

          <TextField
            type="password"
            label="Confirm New Password"
            fullWidth
            margin="normal"
            value={confirmPassword}
            onChange={(e) => setConfirmPassword(e.target.value)}
            required
          />

<Button
  type="submit"
  variant="contained"
  fullWidth
  sx={{ mt: 2 }}
  disabled={username === 'testuser'}
>
  Submit
</Button>

{username === 'testuser' && (
  <Box
    sx={{
      mt: 1,
      backgroundColor: '#f5f5f5',
      p: 1.5,
      borderRadius: 1,
      borderLeft: '4px solid #0288d1',
      fontSize: '0.875rem',
      color: '#333',
    }}
  >
    Password changes are disabled for this user.
  </Box>
)}



        </form>

        {message && <Alert severity="success" sx={{ mt: 2 }}>{message}</Alert>}
        {error && <Alert severity="error" sx={{ mt: 2 }}>{error}</Alert>}
      </Box>
    </Drawer>
  );
};

export default ChangePasswordDrawer;