'use client';

import { useState } from 'react';
import { signIn } from 'next-auth/react';
import { useRouter } from 'next/navigation';
import Link from 'next/link';
import { Gauge, Mail, Lock, User, Loader2 } from 'lucide-react';
import { motion } from 'framer-motion';

export default function SignupPage() {
  const router = useRouter();
  const [formData, setFormData] = useState({
    email: '',
    password: '',
    firstName: '',
    lastName: '',
  });
  const [error, setError] = useState('');
  const [loading, setLoading] = useState(false);

  const handleChange = (e: React.ChangeEvent<HTMLInputElement>) => {
    setFormData({ ...formData, [e.target.name]: e.target.value });
  };

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

    try {
      const res = await fetch('/api/signup', {
        method: 'POST',
        headers: { 'Content-Type': 'application/json' },
        body: JSON.stringify(formData),
      });

      const data = await res.json();

      if (!res.ok) {
        setError(data?.error || 'Signup failed');
        setLoading(false);
        return;
      }

      // Auto sign in after signup
      const result = await signIn('credentials', {
        email: formData.email,
        password: formData.password,
        redirect: false,
      });

      if (result?.error) {
        setError('Signup succeeded but login failed');
      } else {
        router.replace('/dashboard');
      }
    } catch {
      setError('An error occurred');
    } finally {
      setLoading(false);
    }
  };

  return (
    <div className="min-h-screen flex items-center justify-center bg-gradient-to-b from-background to-secondary/30 px-4 py-8">
      <motion.div
        initial={{ opacity: 0, y: 20 }}
        animate={{ opacity: 1, y: 0 }}
        className="w-full max-w-md"
      >
        <div className="text-center mb-8">
          <Link href="/" className="inline-flex items-center gap-2">
            <Gauge className="w-10 h-10 text-primary" />
            <span className="font-bold text-2xl">CNC Calculator</span>
          </Link>
        </div>

        <div className="bg-card rounded-xl shadow-xl p-8">
          <h1 className="text-2xl font-bold mb-6 text-center">Create Account</h1>

          {error && (
            <div className="bg-destructive/20 text-red-400 p-3 rounded-lg mb-4 text-sm">
              {error}
            </div>
          )}

          <form onSubmit={handleSubmit} className="space-y-4">
            <div className="grid grid-cols-2 gap-4">
              <div>
                <label className="block text-sm font-medium mb-2">First Name</label>
                <div className="relative">
                  <User className="absolute left-3 top-1/2 -translate-y-1/2 w-5 h-5 text-muted-foreground" />
                  <input
                    type="text"
                    name="firstName"
                    value={formData.firstName}
                    onChange={handleChange}
                    className="w-full pl-10 pr-4 py-3 bg-secondary rounded-lg focus:outline-none focus:ring-2 focus:ring-primary"
                    placeholder="John"
                  />
                </div>
              </div>
              <div>
                <label className="block text-sm font-medium mb-2">Last Name</label>
                <input
                  type="text"
                  name="lastName"
                  value={formData.lastName}
                  onChange={handleChange}
                  className="w-full px-4 py-3 bg-secondary rounded-lg focus:outline-none focus:ring-2 focus:ring-primary"
                  placeholder="Doe"
                />
              </div>
            </div>

            <div>
              <label className="block text-sm font-medium mb-2">Email</label>
              <div className="relative">
                <Mail className="absolute left-3 top-1/2 -translate-y-1/2 w-5 h-5 text-muted-foreground" />
                <input
                  type="email"
                  name="email"
                  value={formData.email}
                  onChange={handleChange}
                  className="w-full pl-10 pr-4 py-3 bg-secondary rounded-lg focus:outline-none focus:ring-2 focus:ring-primary"
                  placeholder="your@email.com"
                  required
                />
              </div>
            </div>

            <div>
              <label className="block text-sm font-medium mb-2">Password</label>
              <div className="relative">
                <Lock className="absolute left-3 top-1/2 -translate-y-1/2 w-5 h-5 text-muted-foreground" />
                <input
                  type="password"
                  name="password"
                  value={formData.password}
                  onChange={handleChange}
                  className="w-full pl-10 pr-4 py-3 bg-secondary rounded-lg focus:outline-none focus:ring-2 focus:ring-primary"
                  placeholder="••••••••"
                  required
                  minLength={6}
                />
              </div>
            </div>

            <button
              type="submit"
              disabled={loading}
              className="w-full py-3 bg-primary text-primary-foreground rounded-lg font-medium hover:bg-primary/90 transition-colors disabled:opacity-50 flex items-center justify-center gap-2"
            >
              {loading ? <Loader2 className="w-5 h-5 animate-spin" /> : null}
              {loading ? 'Creating account...' : 'Create Account'}
            </button>
          </form>

          <p className="text-center text-sm text-muted-foreground mt-6">
            Already have an account?{' '}
            <Link href="/login" className="text-primary hover:underline">
              Sign in
            </Link>
          </p>
        </div>
      </motion.div>
    </div>
  );
}