"use client";

import Link from "next/link";
import { useRouter } from "next/navigation";
import React, { useState, useEffect } from "react";
import { api } from "@/lib/api";

export default function Login() {
  const router = useRouter();
  const [email, setEmail] = useState("");
  const [password, setPassword] = useState("");
  const [error, setError] = useState<string | null>(null);
  const [loading, setLoading] = useState(false);

  useEffect(() => {
    if (api.isAuthenticated()) {
      router.push("/dashboard");
    }
  }, [router]);

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

    try {
      const response = await api.post<{ ok: boolean; token: string; user: unknown }>("/api/v1/auth/login", {
        email,
        password,
      });

      if (response.ok) {
        api.setToken(response.token);
        api.setUser(response.user);
        router.push("/dashboard");
      } else {
        setError("Invalid login response");
      }
    } catch (err: unknown) {
      const errMsg = err instanceof Error ? err.message : "Failed to log in. Please check your credentials.";
      setError(errMsg);
    } finally {
      setLoading(false);
    }
  };

  return (
    <div className="flex-1 flex items-center justify-center bg-background relative px-4 py-12">
      {/* Glow graphics */}
      <div className="absolute top-1/2 left-1/2 -translate-x-1/2 -translate-y-1/2 w-96 h-96 bg-primary/10 rounded-full blur-3xl pointer-events-none" />

      <div className="w-full max-w-md glass-panel p-8 rounded-2xl shadow-2xl z-10 animate-fade-in">
        <div className="text-center mb-8">
          <Link href="/" className="text-2xl font-extrabold tracking-tight gradient-text">
            NanoBuild
          </Link>
          <h2 className="text-xl font-bold text-foreground mt-4">Welcome back</h2>
          <p className="text-sm text-muted-foreground mt-1">Sign in to manage your licenses</p>
        </div>

        {error && (
          <div className="mb-6 p-4 bg-destructive/10 border border-destructive/20 rounded-lg text-sm text-red-400">
            {error}
          </div>
        )}

        <form onSubmit={handleSubmit} className="space-y-5">
          <div>
            <label className="block text-xs font-semibold text-muted-foreground uppercase tracking-wider mb-2">
              Email Address
            </label>
            <input
              type="email"
              required
              className="w-full bg-card border border-border rounded-lg px-4 py-3 text-foreground placeholder:text-muted-foreground focus:outline-none focus:border-primary transition-colors text-sm"
              placeholder="you@example.com"
              value={email}
              onChange={(e) => setEmail(e.target.value)}
            />
          </div>

          <div>
            <label className="block text-xs font-semibold text-muted-foreground uppercase tracking-wider mb-2">
              Password
            </label>
            <input
              type="password"
              required
              className="w-full bg-card border border-border rounded-lg px-4 py-3 text-foreground placeholder:text-muted-foreground focus:outline-none focus:border-primary transition-colors text-sm"
              placeholder="••••••••"
              value={password}
              onChange={(e) => setPassword(e.target.value)}
            />
          </div>

          <button
            type="submit"
            disabled={loading}
            className="w-full glow-btn bg-primary hover:bg-primary/95 text-white font-semibold py-3 rounded-lg mt-2 transition-colors disabled:opacity-50 text-sm"
          >
            {loading ? "Authenticating..." : "Sign In"}
          </button>
        </form>

        <p className="text-center text-sm text-muted-foreground mt-8">
          Don&apos;t have an account?{" "}
          <Link href="/register" className="text-primary hover:underline font-semibold">
            Create an account
          </Link>
        </p>
      </div>
    </div>
  );
}