import type { components } from "../../../contracts/studio/generated.ts";
import { createNewItemId } from "../../../domain/studio/local-id.ts";

type CatalogEntry = components["schemas"]["CatalogEntry"];
type RelationInput = components["schemas"]["RelationInput"];

function ordered(relations: RelationInput[]): RelationInput[] {
  return relations.map((relation, order) => ({ ...relation, order }));
}

export function RelationEditor({ relations, catalog, evidence = false, onChange }: { relations: RelationInput[]; catalog: CatalogEntry[]; evidence?: boolean; onChange(relations: RelationInput[]): void }) {
  const noun = evidence ? "근거" : "관계";
  const update = (index: number, patch: Partial<RelationInput>) => onChange(ordered(relations.map((relation, candidateIndex) => candidateIndex === index ? { ...relation, ...patch } : relation)));
  const move = (index: number, delta: -1 | 1) => {
    const target = index + delta;
    if (target < 0 || target >= relations.length) return;
    const next = [...relations];
    [next[index], next[target]] = [next[target]!, next[index]!];
    onChange(ordered(next));
  };
  return (
    <fieldset className="studio-ordered-list">
      <legend>{evidence ? "근거 기록" : "관계"}</legend>
      {relations.length === 0 ? <p>{evidence ? "연결한 근거 기록이 없습니다." : "연결한 공개 기록이 없습니다."}</p> : null}
      {relations.map((relation, index) => (
        <div className="studio-relation-item" key={relation.id ?? `relation-${index}`}>
          <label><span>{noun} {index + 1} 대상</span><select value={relation.targetId ?? ""} onChange={(event) => update(index, { targetId: event.currentTarget.value || null })}><option value="">대상 선택</option>{catalog.map((entry) => <option key={entry.id} value={entry.id} disabled={relations.some((candidate, candidateIndex) => candidateIndex !== index && candidate.targetId === entry.id)}>{entry.label}</option>)}</select></label>
          <label><span>{noun} {index + 1} 이유</span><input value={relation.reason} onChange={(event) => update(index, { reason: event.currentTarget.value })} /></label>
          <div className="studio-item-actions"><button type="button" onClick={() => move(index, -1)} disabled={index === 0}>위로</button><button type="button" onClick={() => move(index, 1)} disabled={index === relations.length - 1}>아래로</button><button type="button" onClick={() => onChange(ordered(relations.filter((_, candidateIndex) => candidateIndex !== index)))}>삭제</button></div>
        </div>
      ))}
      <button className="studio-add-item" type="button" disabled={relations.length >= 20} onClick={() => { if (relations.length < 20) onChange(ordered([...relations, { id: createNewItemId(), targetId: null, reason: "", order: relations.length }])); }}>{noun} 추가</button>
    </fieldset>
  );
}