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package org.robolectric.shadows;

import android.content.res.Resources;
import android.util.LongSparseArray;
import java.lang.reflect.Field;
import java.lang.reflect.Modifier;
import java.util.ArrayList;
import java.util.List;

public abstract class ShadowResourcesImpl {

  public static class Picker extends ResourceModeShadowPicker {

    public Picker() {
      super(ShadowArscResourcesImpl.class, ShadowArscResourcesImpl.class);
    }
  }

  private static List> resettableArrays;

  public static void reset() {
    if (resettableArrays == null) {
      resettableArrays = obtainResettableArrays();
    }
    for (LongSparseArray sparseArray : resettableArrays) {
      sparseArray.clear();
    }
  }

  private static List> obtainResettableArrays() {
    List> resettableArrays = new ArrayList<>();
    Field[] allFields = Resources.class.getDeclaredFields();
    for (Field field : allFields) {
      if (Modifier.isStatic(field.getModifiers())
          && field.getType().equals(LongSparseArray.class)) {
        field.setAccessible(true);
        try {
          LongSparseArray longSparseArray = (LongSparseArray) field.get(null);
          if (longSparseArray != null) {
            resettableArrays.add(longSparseArray);
          }
        } catch (IllegalAccessException e) {
          throw new RuntimeException(e);
        }
      }
    }
    return resettableArrays;
  }
}