wongjiahau/ttap-web

const clone = require("lodash.clone");
const find = require("lodash.find");
import { Subject } from "../../model/subject";
import { IMasterState, MasterStateAction } from "./../reducers/masterState";

export class ToggleSelectionOnGroupOfSlots extends MasterStateAction {
  public constructor(private subjectCode: string) {
    super();
  }
  public TypeName(): string {
    return `toggle selection on group of slots of (${this.subjectCode})`;
  }
  protected GenerateNewState(state: IMasterState): IMasterState {
    const targetSubject = find(state.SubjectListState.Subjects, {
      Code: this.subjectCode,
    }) as Subject;
    let selectedSlotsCount = 0;
    let deselectedSlotsCount = 0;
    targetSubject.SlotNumbers.forEach((slotNumber) => {
      if (state.SlotTableState.SlotStates[slotNumber] === true) {
        selectedSlotsCount++;
      } else {
        deselectedSlotsCount++;
      }
    });

    const allSlotShouldBeSelected = deselectedSlotsCount > selectedSlotsCount;
    const newSlotStates = clone(state.SlotTableState.SlotStates);
    targetSubject.SlotNumbers.forEach((slotNumber) => {
      newSlotStates[slotNumber] = allSlotShouldBeSelected;
    });
    const newSubjectStates = clone(state.SlotTableState.SubjectStates);
    newSubjectStates[this.subjectCode] = allSlotShouldBeSelected
      ? "true"
      : "false";

    return {
      ...state,
      SlotTableState: {
        ...state.SlotTableState,
        SlotStates: newSlotStates,
        SubjectStates: newSubjectStates,
      },
    };
  }
}