'use client';

import { useState, useEffect } from 'react';
import { useRouter, useSearchParams } from 'next/navigation';
import { Eye, EyeOff } from 'lucide-react';
import { Button } from '@/components/ui/button';
import { Input } from '@/components/ui/input';
import {
  Dialog,
  DialogContent,
  DialogDescription,
  DialogFooter,
  DialogHeader,
  DialogTitle,
} from '@/components/ui/dialog';
import Link from 'next/link';
import { isValidEmail } from '@/lib/utils';

interface RegisterDialogProps {
  open: boolean;
  onOpenChange: (open: boolean) => void;
  onSuccess?: () => void;
  onOpenLogin?: () => void;
  callbackUrl?: string;
}

export function RegisterDialog({
  open,
  onOpenChange,
  onSuccess,
  onOpenLogin,
  callbackUrl: initialCallbackUrl,
}: RegisterDialogProps) {
  const router = useRouter();
  const searchParams = useSearchParams();
  const callbackUrl = initialCallbackUrl || searchParams.get('callbackUrl') || '/';
  
  const [name, setName] = useState('');
  const [email, setEmail] = useState('');
  const [password, setPassword] = useState('');
  const [confirmPassword, setConfirmPassword] = useState('');
  const [error, setError] = useState('');
  const [isLoading, setIsLoading] = useState(false);
  const [showPassword, setShowPassword] = useState(false);
  const [showConfirmPassword, setShowConfirmPassword] = useState(false);

  // Clear form when dialog opens
  useEffect(() => {
    if (open) {
      setName('');
      setEmail('');
      setPassword('');
      setConfirmPassword('');
      setError('');
      setShowPassword(false);
      setShowConfirmPassword(false);
    }
  }, [open]);

  const handleSubmit = async (e: React.FormEvent) => {
    e.preventDefault();
    setError('');

    if (!name || name.trim().length === 0) {
      setError('Name is required');
      return;
    }

    if (!email || !isValidEmail(email)) {
      setError('Please enter a valid email address');
      return;
    }

    if (password !== confirmPassword) {
      setError('Passwords do not match');
      return;
    }

    if (password.length < 6) {
      setError('Password must be at least 6 characters');
      return;
    }

    setIsLoading(true);

    try {
      const response = await fetch('/api/auth/register', {
        method: 'POST',
        headers: {
          'Content-Type': 'application/json',
        },
        body: JSON.stringify({ email, password, name }),
      });

      const data = await response.json();

      if (!response.ok) {
        setError(data.error || 'Failed to create account');
        return;
      }

      // Registration successful - clear form and show success message
      setName('');
      setEmail('');
      setPassword('');
      setConfirmPassword('');
      setError('');
      
      // Show success state
      alert('Account created successfully! Please check your email to confirm your account before signing in.');
      
      onOpenChange(false);
      if (onOpenLogin) {
        // Open login dialog with registered flag
        onOpenLogin();
      } else if (onSuccess) {
        onSuccess();
      } else {
        // Redirect to login with registered flag
        router.push(`/login?registered=true&callbackUrl=${encodeURIComponent(callbackUrl)}`);
      }
    } catch (err) {
      setError('An error occurred. Please try again.');
    } finally {
      setIsLoading(false);
    }
  };

  const handleOpenChange = (newOpen: boolean) => {
    if (!newOpen) {
      // Reset form when closing
      setName('');
      setEmail('');
      setPassword('');
      setConfirmPassword('');
      setError('');
      setShowPassword(false);
      setShowConfirmPassword(false);
    }
    onOpenChange(newOpen);
  };

  return (
    <Dialog open={open} onOpenChange={handleOpenChange}>
      <DialogContent className="sm:max-w-md">
        <DialogHeader>
          <DialogTitle>Create your account</DialogTitle>
          <DialogDescription>
            Or{' '}
            <button
              type="button"
              className="font-medium text-secondary hover:text-secondary/80"
              onClick={() => {
                handleOpenChange(false);
                if (onOpenLogin) {
                  onOpenLogin();
                }
              }}
            >
              sign in to your existing account
            </button>
          </DialogDescription>
        </DialogHeader>
        <form onSubmit={handleSubmit} className="space-y-4">
          {error && (
            <div className="rounded-md bg-red-50 p-4 dark:bg-red-900/20">
              <p className="text-sm text-red-800 dark:text-red-200">{error}</p>
            </div>
          )}
          <div className="space-y-4">
            <div>
              <label htmlFor="name" className="block text-sm font-medium text-secondary dark:text-gray-300">
                Name <span className="text-red-500">*</span>
              </label>
              <Input
                id="name"
                name="name"
                type="text"
                autoComplete="off"
                required
                value={name}
                onChange={(e) => setName(e.target.value)}
                className="mt-1"
                placeholder="Your full name"
              />
            </div>
            <div>
              <label htmlFor="email" className="block text-sm font-medium text-secondary dark:text-gray-300">
                Email address <span className="text-red-500">*</span>
              </label>
              <Input
                id="email"
                name="email"
                type="email"
                autoComplete="off"
                required
                value={email}
                onChange={(e) => setEmail(e.target.value)}
                className="mt-1"
                placeholder="you@example.com"
              />
            </div>
            <div>
              <label htmlFor="password" className="block text-sm font-medium text-secondary dark:text-gray-300">
                Password
              </label>
              <div className="relative mt-1">
                <Input
                  id="password"
                  name="password"
                  type={showPassword ? 'text' : 'password'}
                  autoComplete="new-password"
                  required
                  value={password}
                  onChange={(e) => setPassword(e.target.value)}
                  className="pr-10"
                  placeholder="••••••••"
                />
                <button
                  type="button"
                  onClick={() => setShowPassword(!showPassword)}
                  className="absolute right-3 top-1/2 -translate-y-1/2 text-secondary hover:text-secondary/80 focus:outline-none"
                  aria-label={showPassword ? 'Hide password' : 'Show password'}
                >
                  {showPassword ? (
                    <EyeOff className="h-4 w-4" />
                  ) : (
                    <Eye className="h-4 w-4" />
                  )}
                </button>
              </div>
              <p className="mt-1 text-xs text-gray-500 dark:text-gray-400">
                Must be at least 6 characters
              </p>
            </div>
            <div>
              <label htmlFor="confirmPassword" className="block text-sm font-medium text-secondary dark:text-gray-300">
                Confirm Password
              </label>
              <div className="relative mt-1">
                <Input
                  id="confirmPassword"
                  name="confirmPassword"
                  type={showConfirmPassword ? 'text' : 'password'}
                  autoComplete="new-password"
                  required
                  value={confirmPassword}
                  onChange={(e) => setConfirmPassword(e.target.value)}
                  className="pr-10"
                  placeholder="••••••••"
                />
                <button
                  type="button"
                  onClick={() => setShowConfirmPassword(!showConfirmPassword)}
                  className="absolute right-3 top-1/2 -translate-y-1/2 text-secondary hover:text-secondary/80 focus:outline-none"
                  aria-label={showConfirmPassword ? 'Hide password' : 'Show password'}
                >
                  {showConfirmPassword ? (
                    <EyeOff className="h-4 w-4" />
                  ) : (
                    <Eye className="h-4 w-4" />
                  )}
                </button>
              </div>
            </div>
          </div>
          <DialogFooter>
            <Button
              type="submit"
              className="w-full"
              disabled={isLoading}
            >
              {isLoading ? 'Creating account...' : 'Create account'}
            </Button>
          </DialogFooter>
        </form>
      </DialogContent>
    </Dialog>
  );
}