"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 RegisterPage() {
  const {register} = useAuth();
  const router = useRouter();
  const searchParams = useSearchParams();

  const [form, setForm] = useState({
    fullName: "",
    username: "",
    email: "",
    phone: "",
    password: "",
    confirmPassword: "",});

  const [error, setError] = useState("");
  const [loading, setLoading] = useState(false);

  function handleChange(e) {
    setForm((prev) => ({ ...prev, [e.target.name]: e.target.value }));
  }

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

    if (form.password !== form.confirmPassword) {
      setError("Passwords do not match.");
      return;
    }

    setLoading(true);
    try {
      await register({fullName: form.fullName,
        username: form.username,
        email: form.email,
        phone: form.phone,
        password: form.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">Create Account</h1>

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

        <form className="auth-form" onSubmit={handleSubmit}>
          <label className="auth-label">
            Full Name
            <input
              className="auth-input"
              type="text"
              name="fullName"
              value={form.fullName}
              onChange={handleChange}
              required
            />
          </label>

          <label className="auth-label">
            Username
            <input
              className="auth-input"
              type="text"
              name="username"
              value={form.username}
              onChange={handleChange}
              required
              minLength={3}
            />
          </label>

          <label className="auth-label">
            Email
            <input
              className="auth-input"
              type="email"
              name="email"
              value={form.email}
              onChange={handleChange}
              required
            />
          </label>

          <label className="auth-label">
            Phone
            <input
              className="auth-input"
              type="tel"
              name="phone"
              value={form.phone}
              onChange={handleChange}
              required
            />
          </label>

          <label className="auth-label">
            Password
            <input
              className="auth-input"
              type="password"
              name="password"
              value={form.password}
              onChange={handleChange}
              required
              minLength={6}
              autoComplete="new-password"
            />
          </label>

          <label className="auth-label">
            Confirm Password
            <input
              className="auth-input"
              type="password"
              name="confirmPassword"
              value={form.confirmPassword}
              onChange={handleChange}
              required
              autoComplete="new-password"
            />
          </label>

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

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