/**
 * state.js — Единое реактивное состояние редактора «Кадр»
 */

const state = {
  currentVersionId: null,
  historyVersions: [],
  collapsedGroups: new Map(), // groupId (id корня) -> true (свёрнута)
  reference: {
    file: null,
    versionId: null,
    image: null,
    region: null,
  },
  isBusy: false,
  activeJobs: new Map(),
  suggestRunning: false,
};

const listeners = new Set();

export function subscribe(listener) {
  listeners.add(listener);
  return () => listeners.delete(listener);
}

export function notify(changeKey) {
  for (const listener of listeners) {
    try {
      listener(state, changeKey);
    } catch (err) {
      console.error("State listener error:", err);
    }
  }
}

export function getState() {
  return state;
}

export function setCurrentVersionId(id) {
  state.currentVersionId = id;
  notify("currentVersionId");
}

export function setHistoryVersions(versions) {
  state.historyVersions = Array.isArray(versions) ? versions : [];
  notify("historyVersions");
}

export function setBusy(busy) {
  state.isBusy = Boolean(busy);
  notify("isBusy");
}

export function setSuggestRunning(running) {
  state.suggestRunning = Boolean(running);
  notify("suggestRunning");
}

export function setReference(refData) {
  state.reference = { ...state.reference, ...refData };
  notify("reference");
}

export function clearReferenceState() {
  state.reference = {
    file: null,
    versionId: null,
    image: null,
    region: null,
  };
  notify("reference");
}