Function reducer

src/importer/reducer.tsx:44–190

(
  state: ImporterState,
  action: ImporterAction
)

}

export const reducer = (
  state: ImporterState,
  action: ImporterAction
): ImporterState => {
  switch (action.type) {
    case 'ENTER_DATA_MANUALLY': {
      const emptyData = state.sheetDefinitions.map((sheet) => ({
        sheetId: sheet.id,
        rows: Array.from(
          { length: action.payload.amountOfEmptyRowsToAdd },
          () => ({})
        ),
      }));

      return { ...state, mode: 'preview', sheetData: emptyData };
    }
    case 'FILE_PARSED':
      return {
        ...state,
        parsedFile: action.payload.parsed,
        rowFile: action.payload.rowFile,
        mode: 'mapping',
      };
    case 'UPLOAD':
      return { ...state, mode: 'upload' };
    case 'COLUMN_MAPPING_CHANGED': {
      return {
        ...state,
        columnMappings: action.payload.mappings,
      };
    }
    case 'DATA_MAPPED': {
      return {
        ...state,
        sheetData: applyTransformations(
          state.sheetDefinitions,
          action.payload.mappedData
        ),
        mode: 'preview',
      };
    }
    case 'CELL_CHANGED': {
      const currentData = state.sheetData;

      const newData = currentData.map((sheet) => {
        if (sheet.sheetId === action.payload.sheetId) {
          const newRows = [...sheet.rows];

          newRows[action.payload.rowIndex] = recalculateCalculatedColumns(
            action.payload.value,
            action.payload,
            state
          );

          return { ...sheet, rows: newRows };
        } else {
          return sheet;
        }