"use client";

import { useEffect, useState, Suspense } from "react";
import { useSearchParams, useRouter } from "next/navigation";
import Link from "next/link";

function ResetPasswordContent() {
  const searchParams = useSearchParams();
  const router = useRouter();
  const token = searchParams.get('token');

  const [newPassword, setNewPassword] = useState('');
  const [confirmPassword, setConfirmPassword] = useState('');
  const [loading, setLoading] = useState(false);
  const [validating, setValidating] = useState(true);
  const [tokenValid, setTokenValid] = useState(false);
  const [error, setError] = useState('');
  const [success, setSuccess] = useState(false);

  // Validate token on mount
  useEffect(() => {
    if (!token) {
      setError('Invalid reset link');
      setValidating(false);
      return;
    }

    const validateToken = async () => {
      try {
        const response = await fetch(`/api/auth/reset-password?token=${token}`);
        const data = await response.json();

        if (data.valid) {
          setTokenValid(true);
        } else {
          setError('This reset link is invalid or has expired');
        }
      } catch (err) {
        setError('Failed to validate reset link');
      } finally {
        setValidating(false);
      }
    };

    validateToken();
  }, [token]);

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

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

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

    setLoading(true);

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

      const data = await response.json();

      if (!response.ok) {
        throw new Error(data.error || 'Failed to reset password');
      }

      setSuccess(true);

      // Redirect to login after 3 seconds
      setTimeout(() => {
        router.push('/login');
      }, 3000);
    } catch (err: any) {
      setError(err.message || 'An error occurred');
    } finally {
      setLoading(false);
    }
  };

  if (validating) {
    return (
      <div className="min-h-screen flex items-center justify-center bg-gray-100">
        <p className="text-gray-600">Validating reset link...</p>
      </div>
    );
  }

  if (!tokenValid) {
    return (
      <div className="min-h-screen flex items-center justify-center bg-gray-100 px-4">
        <div className="max-w-md w-full bg-white rounded-lg shadow-md p-8">
          <div className="text-center">
            <div className="text-5xl mb-4">❌</div>
            <h2 className="text-2xl font-bold text-gray-900 mb-2">
              Invalid Reset Link
            </h2>
            <p className="text-gray-600 mb-6">
              {error || 'This password reset link is invalid or has expired.'}
            </p>
            <Link
              href="/forgot-password"
              className="text-blue-600 hover:text-blue-700 font-medium"
            >
              Request New Reset Link →
            </Link>
          </div>
        </div>
      </div>
    );
  }

  if (success) {
    return (
      <div className="min-h-screen flex items-center justify-center bg-gray-100 px-4">
        <div className="max-w-md w-full bg-white rounded-lg shadow-md p-8">
          <div className="text-center">
            <div className="text-5xl mb-4">✅</div>
            <h2 className="text-2xl font-bold text-gray-900 mb-2">
              Password Reset Successful
            </h2>
            <p className="text-gray-600 mb-6">
              Your password has been reset successfully. Redirecting to login...
            </p>
            <Link
              href="/login"
              className="text-blue-600 hover:text-blue-700 font-medium"
            >
              Go to Login →
            </Link>
          </div>
        </div>
      </div>
    );
  }

  return (
    <div className="min-h-screen flex items-center justify-center bg-gray-100 px-4">
      <div className="max-w-md w-full bg-white rounded-lg shadow-md p-8">
        <h2 className="text-2xl font-bold text-gray-900 mb-2">
          Reset Password
        </h2>
        <p className="text-gray-600 mb-6">
          Enter your new password below.
        </p>

        {error && (
          <div className="mb-4 p-3 bg-red-100 text-red-800 rounded">
            {error}
          </div>
        )}

        <form onSubmit={handleSubmit}>
          <div className="mb-4">
            <label className="block text-sm font-medium text-gray-700 mb-2">
              New Password
            </label>
            <input
              type="password"
              required
              minLength={6}
              value={newPassword}
              onChange={(e) => setNewPassword(e.target.value)}
              className="w-full px-4 py-2 border border-gray-300 rounded-md focus:outline-none focus:ring-2 focus:ring-blue-500"
              placeholder="At least 6 characters"
            />
          </div>

          <div className="mb-6">
            <label className="block text-sm font-medium text-gray-700 mb-2">
              Confirm New Password
            </label>
            <input
              type="password"
              required
              minLength={6}
              value={confirmPassword}
              onChange={(e) => setConfirmPassword(e.target.value)}
              className="w-full px-4 py-2 border border-gray-300 rounded-md focus:outline-none focus:ring-2 focus:ring-blue-500"
              placeholder="Re-enter password"
            />
          </div>

          <button
            type="submit"
            disabled={loading}
            className="w-full px-4 py-2 bg-blue-600 text-white rounded-md hover:bg-blue-700 disabled:bg-gray-400 font-medium"
          >
            {loading ? 'Resetting...' : 'Reset Password'}
          </button>
        </form>
      </div>
    </div>
  );
}

export default function ResetPasswordPage() {
  return (
    <Suspense fallback={
      <div className="min-h-screen flex items-center justify-center bg-gray-100">
        <p className="text-gray-600">Loading...</p>
      </div>
    }>
      <ResetPasswordContent />
    </Suspense>
  );
}