"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";

const labelCls = "flex flex-col gap-[0.35rem] text-[0.9rem] font-semibold text-[#444]";
const inputCls = "px-[0.85rem] py-[0.6rem] border border-[#ddd] rounded-lg text-base outline-none transition-all focus:border-[#e68672] focus:shadow-[0_0_0_3px_rgba(230,134,114,0.2)]";
const submitBtnCls = "mt-2 py-3 bg-[#e68672] text-white border-none rounded-lg text-base font-bold cursor-pointer transition-all hover:bg-[#d4705e] active:scale-[0.98] disabled:opacity-60 disabled:cursor-not-allowed";

//Returns the redirect path after login, blocking open redirects to external or auth pages
function resolveNextPath(candidate) {
  if (!candidate || !candidate.startsWith("/")) return "/";
  if (candidate.startsWith("//") || candidate.startsWith("/login") || candidate.startsWith("/register")) return "/";
  return candidate;
}

//Login page
//Username and password form, redirects to the page the user was trying to visit
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);

  //Submits the login form and redirects on success
  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="min-h-[calc(100vh-70px)] flex items-center justify-center py-8 px-4 bg-[#fafafa]">
      <div className="bg-white rounded-2xl shadow-[0_4px_24px_rgba(0,0,0,0.1)] p-10 w-full max-w-[440px] max-[480px]:p-6">
        <h1 className="text-[1.75rem] font-bold text-[#222] m-0 mb-6 text-center">Log In</h1>

        {error && <p className="bg-[#fff0f0] border border-[#f5c6c6] text-[#c0392b] rounded-lg px-4 py-[0.65rem] text-[0.9rem] mb-2">{error}</p>}

        <form className="flex flex-col gap-4" onSubmit={handleSubmit}>
          <label className={labelCls}>
            Username
            <input className={inputCls} type="text" value={username} onChange={(e) => setUsername(e.target.value)} required autoComplete="username" />
          </label>
          <label className={labelCls}>
            Password
            <input className={inputCls} type="password" value={password} onChange={(e) => setPassword(e.target.value)} required autoComplete="current-password" />
          </label>
          <button className={submitBtnCls} type="submit" disabled={loading}>{loading ? "Logging in…" : "Log In"}</button>
        </form>

        <p className="text-center text-[0.9rem] text-[#666] mt-5">
          Don&apos;t have an account?{" "}
          <Link href={searchParams.get("next") ? `/register?next=${encodeURIComponent(searchParams.get("next"))}` : "/register"} className="text-[#e68672] font-semibold no-underline hover:underline">Register here</Link>
        </p>
        <p className="text-center text-[0.9rem] text-[#666] mt-5">
          Forgot your password?{" "}
          <Link href="/forgot-password" className="text-[#e68672] font-semibold no-underline hover:underline">Reset it here</Link>
        </p>
      </div>
    </main>
  );
}

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