"use client";

import dynamic from "next/dynamic";
import Link from "next/link";
import { useState } from "react";
import { useRouter, useSearchParams } from "next/navigation";
import { useAuth } from "@/context/AuthContext";

function resolveNextPath(candidate) {
  if (!candidate || !candidate.startsWith("/")) {
    return "/";
  }
  if (candidate.startsWith("//") || candidate.startsWith("/login") || candidate.startsWith("/register")) {
    return "/";
  }
  return candidate;
}

function LoginPage() {
  const {login} = useAuth();
  const router = useRouter();
  const searchParams = useSearchParams();

  const [username, setUsername] = useState("");
  const [password, setPassword] = useState("");
  const [error, setError] = useState("");
  const [loading, setLoading] = useState(false);

  async function handleSubmit(e) {
    e.preventDefault();
    setError("");
    setLoading(true);

    try {
      await login(username, password);
      router.push(resolveNextPath(searchParams.get("next")));
    } 
    
    catch (err) {
      setError(err.message);
    } 
    
    finally {
      setLoading(false);
    }
  }

  return (
    <main className="auth-page">
      <div className="auth-card">
        <h1 className="auth-title">Log In</h1>

        {error && <p className="auth-error">{error}</p>}

        <form className="auth-form" onSubmit={handleSubmit}>
          <label className="auth-label">
            Username
            <input className="auth-input"
              type="text"
              value={username}
              onChange={(e) => setUsername(e.target.value)}
              required
              autoComplete="username"/>
          </label>

          <label className="auth-label">
            Password
            <input className="auth-input"
              type="password"
              value={password}
              onChange={(e) => setPassword(e.target.value)}
              required
              autoComplete="current-password"/>
          </label>

          <button className="auth-submit-btn" type="submit" disabled={loading}>
            {loading ? "Logging in…" : "Log In"}
          </button>
        </form>
        
        <p className="auth-switch">
          Don&apos;t have an account?{" "}
          <Link href={searchParams.get("next") ? `/register?next=${encodeURIComponent(searchParams.get("next"))}` : "/register"} className="auth-switch-link">Register here</Link>
        </p>
      </div>
    </main>
  );
}

export default dynamic(() => Promise.resolve(LoginPage), {
  ssr: false,
});