export interface DetailDateRange {
  startDate?: string;
  endDate?: string;
}

type NullableValue<T> = T | undefined | null | '';

export function pickDetailValue<T>(...values: NullableValue<T>[]): T | undefined {
  for (const value of values) {
    if (value !== undefined && value !== null && value !== '') {
      return value as T;
    }
  }
  return undefined;
}

export function pickDetailArrayValue<T>(...values: Array<T[] | undefined | null>): T[] | undefined {
  for (const value of values) {
    if (Array.isArray(value) && value.length) {
      return value;
    }
  }
  return undefined;
}

export function mergeDetailDateRange(
  baseRange: DetailDateRange = {},
  scopedRange: DetailDateRange = {},
): DetailDateRange {
  const startCandidates = [baseRange.startDate, scopedRange.startDate].filter(Boolean).sort();
  const endCandidates = [baseRange.endDate, scopedRange.endDate].filter(Boolean).sort();
  const startDate = startCandidates[startCandidates.length - 1];
  const endDate = endCandidates[0];

  if (startDate && endDate && startDate > endDate) {
    return {
      startDate: pickDetailValue(scopedRange.startDate, baseRange.startDate),
      endDate: pickDetailValue(scopedRange.endDate, baseRange.endDate),
    };
  }

  return { startDate, endDate };
}