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package rinde.sim.pdptw.generator;

import static com.google.common.base.Preconditions.checkArgument;

import java.util.Collections;

import javax.annotation.Nullable;

import rinde.sim.pdptw.common.AddParcelEvent;
import rinde.sim.scenario.Scenario;

import com.google.common.base.Function;
import com.google.common.base.Predicate;
import com.google.common.collect.Collections2;

public class OrderCountRequirement implements Predicate {
  private final int min;
  private final int max;

  public OrderCountRequirement(int minNumOrders, int maxNumOrders) {
    checkArgument(minNumOrders <= maxNumOrders);
    min = minNumOrders;
    max = maxNumOrders;
  }

  public OrderCountRequirement(int orders) {
    this(orders, orders);
  }

  @Override
  public boolean apply(@Nullable Scenario input) {
    if (input == null) {
      return false;
    }
    final int numOrders = Collections.frequency(
        Collections2.transform(input.asList(),
            new ToClassFunction()), AddParcelEvent.class);
    System.out.println(min + " " + max + " " + numOrders);
    return numOrders >= min && numOrders <= max;
  }

  public static final class ToClassFunction implements
      Function> {
    @Override
    @Nullable
    public Class apply(@Nullable Object obj) {
      if (obj == null) {
        return null;
      }
      return obj.getClass();
    }
  }
}