"use client";

import { useState } from "react";
import { useRouter } from "next/navigation";
import Link from "next/link";
import { Loader2 } from "lucide-react";
import { APP_NAME } from "@/lib/constants";

export default function LoginPage() {
  const router = useRouter();
  const [email, setEmail] = useState("");
  const [password, setPassword] = useState("");
  const [error, setError] = useState("");
  const [isLoading, setIsLoading] = useState(false);

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

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

      const data = await res.json();

      if (!res.ok) {
        setError(data.error || "Login failed");
        return;
      }

      router.push("/");
      router.refresh();
    } catch {
      setError("An error occurred");
    } finally {
      setIsLoading(false);
    }
  };

  return (
    <div className="min-h-screen flex items-center justify-center px-4">
      <div className="w-full max-w-sm">
        <div className="text-center mb-8">
          <h1 className="text-2xl font-light mb-2">{APP_NAME}</h1>
          <p className="text-muted">Sign in to your account</p>
        </div>

        <form onSubmit={handleSubmit} className="space-y-4">
          {error && (
            <div className="p-3 bg-red-500/10 border border-red-500/20 rounded-lg text-red-400 text-sm">
              {error}
            </div>
          )}

          <div>
            <label htmlFor="email" className="block text-sm text-muted mb-1">
              Email
            </label>
            <input
              id="email"
              type="email"
              value={email}
              onChange={(e) => setEmail(e.target.value)}
              required
              className="w-full px-4 py-3 bg-surface border border-border rounded-lg focus:outline-none focus:border-muted"
              placeholder="you@example.com"
            />
          </div>

          <div>
            <label htmlFor="password" className="block text-sm text-muted mb-1">
              Password
            </label>
            <input
              id="password"
              type="password"
              value={password}
              onChange={(e) => setPassword(e.target.value)}
              required
              className="w-full px-4 py-3 bg-surface border border-border rounded-lg focus:outline-none focus:border-muted"
              placeholder="Enter your password"
            />
          </div>

          <button
            type="submit"
            disabled={isLoading}
            className="w-full py-3 bg-accent text-white rounded-lg font-medium hover:bg-accent/90 disabled:opacity-50 flex items-center justify-center gap-2"
          >
            {isLoading && <Loader2 className="animate-spin" size={18} />}
            Sign in
          </button>
        </form>

        <p className="text-center text-sm text-muted mt-6">
          Don&apos;t have an account?{" "}
          <Link href="/register" className="text-accent hover:underline">
            Create one
          </Link>
        </p>
      </div>
    </div>
  );
}
