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package com.univapay.sdk.models.response;

import com.univapay.sdk.builders.RetrofitRequestBuilderPaginated;
import com.univapay.sdk.types.CursorDirection;
import java.util.List;

public class PaginatedListIterable implements Iterable> {
  private final PaginatedListIterator paginatedList;

  public PaginatedListIterator getPaginatedList() {
    return paginatedList;
  }

  public PaginatedListIterable(PaginatedListIterator paginatedList) {
    this.paginatedList = paginatedList;
  }

  @Override
  public UnivapayPaginatedListIterator iterator() {
    if (paginatedList == null) {
      throw new NullPointerException();
    }
    return paginatedList;
  }

  public PaginatedListIterable reverse() {
    RetrofitRequestBuilderPaginated lastBuilder = paginatedList.getLastBuilder();
    CursorDirection cursorDirection =
        (lastBuilder.getCursorDirection() == CursorDirection.ASC)
            ? CursorDirection.DESC
            : CursorDirection.ASC;
    lastBuilder.setCursorDirection(cursorDirection);

    if (paginatedList.isNotFirstTime()) {
      List items = paginatedList.getItems();
      if (!items.isEmpty()) {
        paginatedList.setNextCursor(items.get(0).getId());
      }
      lastBuilder.setCursor(paginatedList.getNextCursor());
      paginatedList.setHasMore(true);
    }

    return this;
  }
}