"use client";

import { FormEvent, useState } from "react";
import { useRouter } from "next/navigation";

export function AdminLoginForm() {
  const router = useRouter();
  const [username, setUsername] = useState("");
  const [password, setPassword] = useState("");
  const [error, setError] = useState("");
  const [loading, setLoading] = useState(false);

  async function onSubmit(e: FormEvent) {
    e.preventDefault();
    setError("");
    setLoading(true);
    try {
      const res = await fetch("/api/login", {
        method: "POST",
        headers: { "Content-Type": "application/json" },
        body: JSON.stringify({
          username: username.trim(),
          password,
        }),
      });
      const data = (await res.json()) as { ok?: boolean; error?: string };
      if (!res.ok || !data.ok) {
        setError(data.error || "Login failed");
        return;
      }
      router.replace("/");
      router.refresh();
    } catch {
      setError("Could not reach the server.");
    } finally {
      setLoading(false);
    }
  }

  return (
    <form onSubmit={onSubmit} className="mx-auto w-full max-w-sm space-y-5">
      <div className="field">
        <label htmlFor="admin-username">Username</label>
        <input
          id="admin-username"
          type="text"
          autoComplete="username"
          value={username}
          onChange={(e) => setUsername(e.target.value)}
          required
        />
      </div>
      <div className="field">
        <label htmlFor="admin-password">Password</label>
        <input
          id="admin-password"
          type="password"
          autoComplete="current-password"
          value={password}
          onChange={(e) => setPassword(e.target.value)}
          required
        />
      </div>
      {error ? <p className="alert-error">{error}</p> : null}
      <button type="submit" className="btn btn-primary w-full" disabled={loading}>
        {loading ? "Signing in…" : "Sign in"}
      </button>
    </form>
  );
}