/**
 * useWorkspaceLayout — merkt sich pro Projekt die zuletzt fokussierte Kachel,
 * damit man beim Zurueckkehren in ein Code-Projekt wieder dort landet (Editor/
 * Desktop) statt immer im Chat. Persistiert nach AsyncStorage (Muster wie
 * aria_project_drafts).
 */

import AsyncStorage from '@react-native-async-storage/async-storage';
import { useCallback, useEffect, useRef, useState } from 'react';
import { TileId } from './layout';

const KEY = 'aria_workspace_layout';

interface Entry { focus: TileId | null }
type LayoutMap = Record<string, Entry>;

const keyOf = (projectId: string) => projectId || '__main__';

export function useWorkspaceLayout(projectId: string) {
  const mapRef = useRef<LayoutMap>({});
  const [loaded, setLoaded] = useState(false);

  useEffect(() => {
    AsyncStorage.getItem(KEY).then((v) => {
      if (v) { try { mapRef.current = JSON.parse(v) || {}; } catch { /* ignore */ } }
      setLoaded(true);
    }).catch(() => setLoaded(true));
  }, []);

  const getFocus = useCallback((): TileId | null | undefined => {
    return mapRef.current[keyOf(projectId)]?.focus;
  }, [projectId]);

  const saveFocus = useCallback((focus: TileId | null) => {
    mapRef.current = { ...mapRef.current, [keyOf(projectId)]: { focus } };
    AsyncStorage.setItem(KEY, JSON.stringify(mapRef.current)).catch(() => {});
  }, [projectId]);

  return { loaded, getFocus, saveFocus };
}