/*
 * Copyright (c) 2013 Menny Even-Danan
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.anysoftkeyboard.keyboards.views;

import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import com.anysoftkeyboard.keyboards.Keyboard;

class MiniKeyboardKeyDetector extends KeyDetector {
  private static final int MAX_NEARBY_KEYS = 1;

  private final int mSlideAllowanceSquare;
  private final int mSlideAllowanceSquareTop;

  public MiniKeyboardKeyDetector(float slideAllowance) {
    super();
    mSlideAllowanceSquare = (int) (slideAllowance * slideAllowance);
    // Top slide allowance is slightly longer (sqrt(2) times) than other edges.
    mSlideAllowanceSquareTop = mSlideAllowanceSquare * 2;
  }

  @Override
  protected int getMaxNearbyKeys() {
    return MAX_NEARBY_KEYS;
  }

  @Override
  public int getKeyIndexAndNearbyCodes(int x, int y, @Nullable int[] allKeys) {
    final Keyboard.Key[] keys = getKeys();
    final int touchX = getTouchX(x);
    final int touchY = getTouchY(y);
    int closestKeyIndex = AnyKeyboardViewBase.NOT_A_KEY;
    int closestKeyDist = (y < 0) ? mSlideAllowanceSquareTop : mSlideAllowanceSquare;
    final int keyCount = keys.length;
    for (int i = 0; i < keyCount; i++) {
      final Keyboard.Key key = keys[i];
      int dist = key.squaredDistanceFrom(touchX, touchY);
      if (dist < closestKeyDist) {
        closestKeyIndex = i;
        closestKeyDist = dist;
      }
    }
    if (allKeys != null && closestKeyIndex != AnyKeyboardViewBase.NOT_A_KEY) {
      final Keyboard.Key key = keys[closestKeyIndex];
      allKeys[0] = key.getCodeAtIndex(0, isKeyShifted(key));
    }
    return closestKeyIndex;
  }

  @Override
  public boolean isKeyShifted(@NonNull Keyboard.Key key) {
    // in the mini-keyboard we want to shift the keys depending on the state of the mParent
    // keyboard.
    return mKeyboard != null && mKeyboard.isShifted();
  }
}
