"use client";

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

function ResetPasswordPage() {
  const router = useRouter();
  const searchParams = useSearchParams();
  const token = searchParams.get("token") || "";

  const [newPassword, setNewPassword] = useState("");
  const [confirmPassword, setConfirmPassword] = useState("");
  const [error, setError] = useState("");
  const [loading, setLoading] = useState(false);
  const [success, setSuccess] = useState(false);

  if (!token) {
    return (
      <main className="auth-page">
        <div className="auth-card">
          <h1 className="auth-title">Invalid Link</h1>
          <p className="auth-error">
            This password reset link is missing or invalid. Please request a new one.
          </p>
          <p className="auth-switch">
            <Link href="/forgot-password" className="auth-switch-link">Request a new reset link</Link>
          </p>
        </div>
      </main>
    );
  }

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

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

    setLoading(true);
    try {
      const res = await fetch("/api/v1/auth/reset-password", {
        method: "POST",
        headers: { "Content-Type": "application/json" },
        body: JSON.stringify({ token, newPassword }),
      });

      const data = await res.json();

      if (!res.ok) {
        throw new Error(data.message || "Failed to reset password. The link may have expired.");
      }

      setSuccess(true);
      setTimeout(() => router.push("/login"), 3000);
    } catch (err) {
      setError(err.message);
    } finally {
      setLoading(false);
    }
  }

  if (success) {
    return (
      <main className="auth-page">
        <div className="auth-card">
          <h1 className="auth-title">Password Reset</h1>
          <p style={{ color: "#16a34a", margin: "1rem 0", lineHeight: 1.6 }}>
            Your password has been reset successfully. Redirecting you to login…
          </p>
          <p className="auth-switch">
            <Link href="/login" className="auth-switch-link">Go to login</Link>
          </p>
        </div>
      </main>
    );
  }

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

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

        <form className="auth-form" onSubmit={handleSubmit}>
          <label className="auth-label">
            New Password
            <input
              className="auth-input"
              type="password"
              value={newPassword}
              onChange={(e) => setNewPassword(e.target.value)}
              required
              minLength={6}
              autoComplete="new-password"
            />
          </label>

          <label className="auth-label">
            Confirm New Password
            <input
              className="auth-input"
              type="password"
              value={confirmPassword}
              onChange={(e) => setConfirmPassword(e.target.value)}
              required
              autoComplete="new-password"
            />
          </label>

          <button className="auth-submit-btn" type="submit" disabled={loading}>
            {loading ? "Resetting…" : "Reset Password"}
          </button>
        </form>

        <p className="auth-switch">
          Remember your password?{" "}
          <Link href="/login" className="auth-switch-link">Log in here</Link>
        </p>
      </div>
    </main>
  );
}

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