import { useEffect, useRef, useState } from "react";
import { Plus, Save, Trash2 } from "lucide-react";
import { api } from "../api.js";
import { Button, ErrorNote, Field, Panel, Spinner, timeAgo } from "../ui.jsx";

/** Client page tab: hashtag sets, approved phrases/CTAs, words to avoid, voice notes. */
export default function BrandKit({ slug }) {
  const [kit, setKit] = useState(null);
  const [sets, setSets] = useState([]);
  const [phrases, setPhrases] = useState("");
  const [avoid, setAvoid] = useState("");
  const [notes, setNotes] = useState("");
  const [busy, setBusy] = useState(false);
  const [error, setError] = useState(null);
  const [saved, setSaved] = useState(false);
  const apply = (k) => { setKit(k); setSets(k.hashtagSets.map((s) => ({ name: s.name, tags: s.tags.join(" ") }))); setPhrases(k.phrases.join("\n")); setAvoid(k.avoid.join("\n")); setNotes(k.notes); };
  useEffect(() => { api(`/api/brandkit/${slug}`).then(apply).catch(setError); }, [slug]);

  const save = async () => {
    setBusy(true); setError(null); setSaved(false);
    try { apply(await api(`/api/brandkit/${slug}`, { method: "PUT", body: { hashtagSets: sets, phrases, avoid, notes } })); setSaved(true); } catch (e) { setError(e); }
    setBusy(false);
  };
  if (!kit) return error ? <ErrorNote error={error} /> : <Spinner />;

  return (
    <div className="space-y-4">
      <Panel title="Hashtag sets" subtitle="Saved groups the team can drop into a caption with one click. 3–8 relevant tags per post work best.">
        <div className="space-y-3">
          {sets.map((s, i) => (
            <div key={i} className="grid sm:grid-cols-[180px_1fr_auto] gap-2 items-start">
              <label htmlFor={`bk-n-${i}`} className="sr-only">Set name</label>
              <input id={`bk-n-${i}`} className="input" value={s.name} placeholder="e.g. Local" onChange={(e) => setSets(sets.map((x, j) => (j === i ? { ...x, name: e.target.value } : x)))} />
              <label htmlFor={`bk-t-${i}`} className="sr-only">Hashtags</label>
              <input id={`bk-t-${i}`} className="input" value={s.tags} placeholder="#waterloo #kitchenerwaterloo #kwbakery" onChange={(e) => setSets(sets.map((x, j) => (j === i ? { ...x, tags: e.target.value } : x)))} />
              <button type="button" onClick={() => setSets(sets.filter((_, j) => j !== i))} className="p-2 rounded hover:bg-bad-soft text-muted hover:text-bad" aria-label={`Remove set ${s.name || i + 1}`}><Trash2 className="size-4" /></button>
            </div>
          ))}
          <Button size="sm" icon={Plus} onClick={() => setSets([...sets, { name: "", tags: "" }])}>Add a set</Button>
        </div>
      </Panel>
      <div className="grid lg:grid-cols-2 gap-4">
        <Panel title="Approved phrases and calls to action" subtitle="One per line. Offered while writing captions.">
          <label htmlFor="bk-phrases" className="sr-only">Phrases</label>
          <textarea id="bk-phrases" className="input h-40 py-2" value={phrases} onChange={(e) => setPhrases(e.target.value)} placeholder={"Order online at the link in bio\nBook your table: 519-…\nFresh every morning from 8 a.m."} />
        </Panel>
        <Panel title="Words to avoid" subtitle="One per line. Captions using them get a warning before approval.">
          <label htmlFor="bk-avoid" className="sr-only">Words to avoid</label>
          <textarea id="bk-avoid" className="input h-40 py-2" value={avoid} onChange={(e) => setAvoid(e.target.value)} placeholder={"cheap\nbest in town\ndiscount (say 'offer')"} />
        </Panel>
      </div>
      <Panel title="Voice notes" subtitle="Anything else about how this client sounds. The AI reads this with brand.md.">
        <label htmlFor="bk-notes" className="sr-only">Voice notes</label>
        <textarea id="bk-notes" className="input h-24 py-2" value={notes} onChange={(e) => setNotes(e.target.value)} placeholder="Warm, a little playful. Always sign off with the owner's first name on Fridays." />
      </Panel>
      <div className="flex items-center gap-3">
        <Button variant="primary" icon={Save} loading={busy} onClick={save}>Save brand kit</Button>
        {saved && <span className="text-[12.5px] text-ok">Saved.</span>}
        {kit.updatedAt && !saved && <span className="text-[12px] text-muted">Last changed {timeAgo(kit.updatedAt)} by {kit.updatedBy}</span>}
      </div>
      <ErrorNote error={error} />
    </div>
  );
}

/** Under a caption box: insert hashtag sets/phrases and show live brand checks. */
export function CaptionHelper({ client, caption, platforms, onInsert }) {
  const [kit, setKit] = useState(null);
  const [warnings, setWarnings] = useState([]);
  const timer = useRef(null);
  useEffect(() => { setKit(null); if (client) api(`/api/brandkit/${client}`).then(setKit).catch(() => {}); }, [client]);
  useEffect(() => {
    clearTimeout(timer.current);
    if (!client || !caption?.trim()) { setWarnings([]); return; }
    timer.current = setTimeout(() => api(`/api/brandkit/${client}/check`, { method: "POST", body: { caption, platforms } }).then((r) => setWarnings(r.warnings)).catch(() => {}), 500);
    return () => clearTimeout(timer.current);
  }, [client, caption, platforms.join(",")]); // eslint-disable-line react-hooks/exhaustive-deps

  return (
    <div className="space-y-1.5 mt-1.5">
      {kit && (kit.hashtagSets.length > 0 || kit.phrases.length > 0) && (
        <div className="flex flex-wrap gap-1.5 items-center text-[12px]">
          <span className="text-muted">Insert:</span>
          {kit.hashtagSets.map((s) => <button key={`h-${s.name}`} type="button" onClick={() => onInsert(`\n\n${s.tags.join(" ")}`)} className="h-7 px-2 rounded border border-line hover:bg-canvas" title={s.tags.join(" ")}># {s.name}</button>)}
          {kit.phrases.slice(0, 6).map((p) => <button key={`p-${p}`} type="button" onClick={() => onInsert(`\n${p}`)} className="h-7 px-2 rounded border border-line hover:bg-canvas max-w-[220px] truncate" title={p}>{p}</button>)}
        </div>
      )}
      {warnings.map((w) => <div key={w.text} className={w.level === "bad" ? "text-[12px] text-bad" : "text-[12px] text-warn"}>{w.level === "bad" ? "Fix: " : ""}{w.text}</div>)}
    </div>
  );
}