import { type FormEvent, useState } from "react";
import { Link } from "react-router-dom";
import { requestForgotPassword } from "../api/auth";

const GENERIC_SUCCESS =
  "If an account exists, reset instructions were sent.";

export default function ForgotPasswordPage() {
  const [email, setEmail] = useState("");
  const [pending, setPending] = useState(false);
  const [submitted, setSubmitted] = useState(false);
  const [message, setMessage] = useState<string | null>(null);

  const emailError = !email.trim() ? "Email is required." : "";

  async function handleSubmit(e: FormEvent) {
    e.preventDefault();
    setSubmitted(true);
    if (emailError) return;

    setPending(true);
    try {
      await requestForgotPassword({ email });
      setMessage(GENERIC_SUCCESS);
    } catch {
      setMessage(GENERIC_SUCCESS);
    } finally {
      setPending(false);
    }
  }

  return (
    <div className="flex justify-center py-16 px-4">
      <div className="card w-full max-w-md">
        <h1 className="section-title mb-2">Forgot Password</h1>
        <p className="muted mb-6">
          Enter your email and we will send reset instructions if the account is eligible.
        </p>

        {message ? <div className="alert mb-4">{message}</div> : null}

        <form className="stack gap-4" onSubmit={handleSubmit}>
          <label className="stack gap-1">
            <span className="text-sm font-medium">Email</span>
            <input
              className={`input ${submitted && emailError ? "border-red-500/60 ring-1 ring-red-500/40" : ""}`}
              type="email"
              value={email}
              onChange={(e) => setEmail(e.target.value)}
              autoComplete="email"
              required
            />
            {submitted && emailError ? <span className="text-xs text-red-400">{emailError}</span> : null}
          </label>

          <button className="btn primary" type="submit" disabled={pending}>
            {pending ? "Sending..." : "Send reset instructions"}
          </button>
        </form>

        <p className="muted text-sm mt-6 text-center">
          Back to <Link className="link" to="/login">Sign in</Link>
        </p>
      </div>
    </div>
  );
}