import type { ImportedDataset } from '../domain/dataset';
import type { Review } from '../domain/review';
import type { DynamicFacetFilters } from '../features/search-filter/dynamic-facets';

export type ViewMode = 'records' | 'columns' | 'table' | 'raw';
export type ThemeMode = 'dark' | 'light' | 'system';
export type BackendStatus = 'checking' | 'connected' | 'unavailable';

export interface AppState {
  dataset: ImportedDataset | null;
  activeSheetId: string;
  view: ViewMode;
  search: string;
  sortColumn: string;
  sortDirection: 'asc' | 'desc';
  titleColumn: string;
  statusFilter: string;
  facetFilters: DynamicFacetFilters;
  pathFindingIds: string[];
  actionOnly: boolean;
  selectedRecordId: string;
  reviews: Record<string, Review>;
  projectId: string;
  status: string;
  theme: ThemeMode;
  delimiter: string;
  sidebarCollapsed: boolean;
  backendStatus: BackendStatus;
}

export type SavedViewState = Pick<AppState,
  'activeSheetId' | 'view' | 'search' | 'sortColumn' | 'sortDirection' |
  'titleColumn' | 'statusFilter' | 'facetFilters' | 'pathFindingIds' | 'actionOnly' | 'selectedRecordId'
>;

export function applySavedViewState(current: AppState, savedView: SavedViewState): AppState {
  if (!current.dataset?.sheets.some(sheet => sheet.id === savedView.activeSheetId)) return current;
  const facetFilters = Object.fromEntries(Object.entries(savedView.facetFilters).map(([id, filter]) => [
    id,
    { ...filter, ...(filter.values ? { values: [...filter.values] } : {}) }
  ]));
  return { ...current, ...savedView, facetFilters, pathFindingIds: [...savedView.pathFindingIds] };
}


export const initialAppState: AppState = {
  dataset: null,
  activeSheetId: '',
  view: 'columns',
  search: '',
  sortColumn: 'all',
  sortDirection: 'desc',
  titleColumn: '',
  statusFilter: 'deviation',
  facetFilters: {},
  pathFindingIds: [],
  actionOnly: false,
  selectedRecordId: '',
  reviews: {},
  projectId: '',
  status: 'Ready',
  theme: 'dark',
  delimiter: 'auto',
  sidebarCollapsed: false,
  backendStatus: 'checking'
};