"use client";

import { useState } from "react";
import { API_URL } from '@/lib/api';

export default function LoginPage() {
  const [username, setUsername] = useState("admin");
  const [password, setPassword] = useState("ChangeMe123!");
  const [message, setMessage] = useState("");

  async function handleLogin(e: React.FormEvent) {
    e.preventDefault();
    setMessage("Signing in...");

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

      const data = await res.json();

      if (!res.ok) {
        setMessage("Invalid username or password");
        return;
      }

      localStorage.setItem("user", JSON.stringify(data));
      window.location.href = "/dashboard";
    } catch {
      setMessage("Backend not reachable");
    }
  }

  return (
    <main className="min-h-screen bg-slate-100 flex items-center justify-center px-6">
      <div className="w-full max-w-md rounded-2xl bg-white shadow-xl border border-slate-200 p-8">
        <div className="text-center mb-8">
          <div className="mx-auto mb-4 h-16 w-16 rounded-2xl bg-red-600 flex items-center justify-center text-white text-2xl font-bold">
            DS
          </div>

          <h1 className="text-2xl font-bold text-slate-900">
            Dental Service Platform
          </h1>
          <p className="text-sm text-slate-500 mt-2">
            Secure company operations login
          </p>
        </div>

        <form onSubmit={handleLogin} className="space-y-5">
          <div>
            <label className="block text-sm font-medium text-slate-700 mb-1">
              Username
            </label>
            <input
              className="w-full rounded-lg border border-slate-300 px-4 py-3 text-slate-900 outline-none focus:ring-2 focus:ring-red-500"
              value={username}
              onChange={(e) => setUsername(e.target.value)}
              placeholder="Enter username"
            />
          </div>

          <div>
            <label className="block text-sm font-medium text-slate-700 mb-1">
              Password
            </label>
            <input
              className="w-full rounded-lg border border-slate-300 px-4 py-3 text-slate-900 outline-none focus:ring-2 focus:ring-red-500"
              type="password"
              value={password}
              onChange={(e) => setPassword(e.target.value)}
              placeholder="Enter password"
            />
          </div>

          <button
            type="submit"
            className="w-full rounded-lg bg-red-600 px-4 py-3 font-semibold text-white hover:bg-red-700 transition"
          >
            Sign In
          </button>
        </form>

        {message && (
          <p className="mt-5 text-center text-sm text-slate-700">{message}</p>
        )}
      </div>
    </main>
  );
}