"use client";

import { useEffect, useState } from "react";
import Link from "next/link";
import { loadAiSettings, saveAiSettings, type AiProvider } from "@/lib/ai";

export default function SettingsPage() {
  const [provider, setProvider] = useState<AiProvider>("anthropic");
  const [key, setKey] = useState("");
  const [saved, setSaved] = useState(false);
  const [hasStored, setHasStored] = useState(false);

  useEffect(() => {
    const existing = loadAiSettings();
    if (existing) {
      setProvider(existing.provider);
      setKey(existing.key);
      setHasStored(true);
    }
  }, []);

  const onSave = () => {
    const trimmed = key.trim();
    saveAiSettings(trimmed ? { provider, key: trimmed } : null);
    setHasStored(Boolean(trimmed));
    setSaved(true);
    window.setTimeout(() => setSaved(false), 2500);
  };

  const onClear = () => {
    saveAiSettings(null);
    setKey("");
    setHasStored(false);
    setSaved(true);
    window.setTimeout(() => setSaved(false), 2500);
  };

  return (
    <>
      <h1>Settings</h1>
      <p className="tagline">
        <Link href="/">← Back to the name finder</Link>
      </p>

      <h2>Bring your own AI key (optional)</h2>
      <p className="tagline">
        The name finder works fully offline without this &mdash; the built-in generator needs no
        key and costs nothing. Adding your own API key gets you a second, usually more
        imaginative set of suggestions alongside it. Don&rsquo;t have a key? Sign in with a free
        OTM account on the main page and AI names are included &mdash; a key here overrides that.
      </p>

      <p className="notice info">
        Your key is stored in <strong>this browser only</strong> and the request goes straight
        from your browser to {provider === "anthropic" ? "Anthropic" : "Google"}. It is never sent
        to our server and never appears in our logs. Usage is billed to your own account, so use
        a key with a spending limit set.
      </p>

      <div className="field">
        <label htmlFor="provider">Provider</label>
        <select id="provider" value={provider} onChange={(e) => setProvider(e.target.value as AiProvider)}>
          <option value="anthropic">Anthropic (Claude)</option>
          <option value="gemini">Google (Gemini)</option>
        </select>
        <p className="hint">
          {provider === "anthropic" ? (
            <>
              Create a key at{" "}
              <a href="https://console.anthropic.com/settings/keys" target="_blank" rel="noopener noreferrer">
                console.anthropic.com
              </a>
              . Starts with <code>sk-ant-</code>.
            </>
          ) : (
            <>
              Create a key at{" "}
              <a href="https://aistudio.google.com/apikey" target="_blank" rel="noopener noreferrer">
                aistudio.google.com
              </a>
              . Gemini has a free tier that is plenty for this.
            </>
          )}
        </p>
      </div>

      <div className="field">
        <label htmlFor="key">API key</label>
        <input
          id="key"
          type="password"
          value={key}
          autoComplete="off"
          placeholder={provider === "anthropic" ? "sk-ant-…" : "AIza…"}
          onChange={(e) => setKey(e.target.value)}
        />
      </div>

      <div className="controls">
        <button className="primary" onClick={onSave}>
          Save key
        </button>
        {hasStored ? <button onClick={onClear}>Remove key</button> : null}
        {saved ? <span style={{ color: "var(--ok)", fontSize: 14 }}>Saved to this browser.</span> : null}
      </div>
    </>
  );
}