import { useEffect, useState } from 'react';

interface SearchResult {
  unique_name: string;
  name_en: string | null;
  tier: number | null;
  enchantment: number;
  shop_category: string | null;
  shop_subcategory: string | null;
}

interface RecipeInput {
  input_item: string;
  count: number;
  max_return_amount: number | null;
  name_en: string | null;
}

interface Recipe {
  id: number;
  source: string;
  variant: number;
  amount_crafted: number;
  silver_cost: number;
  focus_cost: number;
  inputs: RecipeInput[];
}

interface ItemDetail {
  item: SearchResult & { weight: number | null; item_value: number | null; crafting_category: string | null };
  recipes: Recipe[];
  usedIn: { output_item: string; name_en: string | null }[];
}

export default function ItemsPage() {
  const [q, setQ] = useState('');
  const [results, setResults] = useState<SearchResult[]>([]);
  const [detail, setDetail] = useState<ItemDetail | null>(null);

  useEffect(() => {
    if (!q.trim()) {
      setResults([]);
      return;
    }
    const t = setTimeout(() => {
      fetch(`/api/items/search?q=${encodeURIComponent(q)}`)
        .then((r) => r.json())
        .then((d) => setResults(d.results ?? []));
    }, 250);
    return () => clearTimeout(t);
  }, [q]);

  const open = (uniqueName: string) => {
    fetch(`/api/items/${encodeURIComponent(uniqueName)}`)
      .then((r) => r.json())
      .then(setDetail);
  };

  return (
    <div>
      <h2>Item Browser</h2>
      <div className="card">
        <input
          type="text"
          placeholder="Search items (e.g. bag, T4_BAG, claymore)..."
          value={q}
          onChange={(e) => setQ(e.target.value)}
        />
        {results.length > 0 && (
          <table style={{ marginTop: 12 }}>
            <thead>
              <tr><th>Name</th><th>ID</th><th>Tier</th><th>Category</th></tr>
            </thead>
            <tbody>
              {results.map((r) => (
                <tr key={r.unique_name} className="clickable" onClick={() => open(r.unique_name)}>
                  <td>
                    {r.name_en ?? <span className="muted">(unnamed)</span>}
                    {r.enchantment > 0 && <span className="tag">.{r.enchantment}</span>}
                  </td>
                  <td className="muted">{r.unique_name}</td>
                  <td>{r.tier ?? '—'}</td>
                  <td className="muted">{r.shop_subcategory ?? r.shop_category ?? '—'}</td>
                </tr>
              ))}
            </tbody>
          </table>
        )}
      </div>

      {detail && (
        <div className="card">
          <h3>
            {detail.item.name_en ?? detail.item.unique_name}
            <span className="tag">{detail.item.unique_name}</span>
          </h3>
          <p className="muted">
            Tier {detail.item.tier ?? '—'} · weight {detail.item.weight ?? '—'} · item value{' '}
            {detail.item.item_value ?? '—'} · {detail.item.crafting_category ?? 'no crafting category'}
          </p>
          {detail.recipes.length === 0 && <p className="muted">No crafting recipe (gathered, dropped, or vendor item).</p>}
          {detail.recipes.map((r) => (
            <div key={r.id} style={{ marginBottom: 12 }}>
              <strong>
                {r.source === 'upgrade' ? 'Enchanting (upgrade)' : 'Crafting'} recipe
                {r.variant > 0 ? ` (alt ${r.variant})` : ''}
              </strong>
              <span className="tag">focus {r.focus_cost}</span>
              {r.amount_crafted !== 1 && <span className="tag">crafts {r.amount_crafted}</span>}
              <ul>
                {r.inputs.map((inp) => (
                  <li key={inp.input_item}>
                    {inp.count}× {inp.name_en ?? inp.input_item}{' '}
                    {inp.max_return_amount === 0 && <span className="tag">no return</span>}
                  </li>
                ))}
              </ul>
            </div>
          ))}
          {detail.usedIn.length > 0 && (
            <>
              <strong>Used in</strong>
              <p className="muted" style={{ marginTop: 4 }}>
                {detail.usedIn.slice(0, 20).map((u) => u.name_en ?? u.output_item).join(', ')}
                {detail.usedIn.length > 20 ? ` … +${detail.usedIn.length - 20} more` : ''}
              </p>
            </>
          )}
        </div>
      )}
    </div>
  );
}