/*
 * Copyright 2016 Google Inc. All rights reserved.
 *
 * 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 org.nativescript.widgets;

import java.util.ArrayList;
import java.util.List;

/**
 * Holds properties related to a single flex line. This class is not expected to be changed outside
 * of the {@link FlexboxLayout}, thus only exposing the getter methods that may be useful for
 * other classes using the {@link FlexboxLayout}.
 */
public class FlexLine {

	FlexLine() {
	}

	/**
	 * @see {@link #getLeft()}
	 */
	int mLeft = Integer.MAX_VALUE;

	/**
	 * @see {@link #getTop()}
	 */
	int mTop = Integer.MAX_VALUE;

	/**
	 * @see {@link #getRight()}
	 */
	int mRight = Integer.MIN_VALUE;

	/**
	 * @see {@link #getBottom()}
	 */
	int mBottom = Integer.MIN_VALUE;

	/**
	 * @see {@link #getMainSize()}
	 */
	int mMainSize;

	/**
	 * The sum of the lengths of dividers along the main axis. This value should be lower or
	 * than than the value of {@link #mMainSize}.
	 */
	int mDividerLengthInMainSize;

	/**
	 * @see {@link #getCrossSize()}
	 */
	int mCrossSize;

	/**
	 * @see {@link #getItemCount()}
	 */
	int mItemCount;

	/** Holds the count of the views whose visibilities are gone */
	int mGoneItemCount;

	/**
	 * @see {@link #getTotalFlexGrow()}
	 */
	float mTotalFlexGrow;

	/**
	 * @see {@link #getTotalFlexShrink()}
	 */
	float mTotalFlexShrink;

	/**
	 * The largest value of the individual child's baseline (obtained by View#getBaseline()
	 * if the {@link FlexboxLayout#mAlignItems} value is not {@link FlexboxLayout#ALIGN_ITEMS_BASELINE}
	 * or the flex direction is vertical, this value is not used.
	 * If the alignment direction is from the bottom to top,
	 * (e.g. flexWrap == FLEX_WRAP_WRAP_REVERSE and flexDirection == FLEX_DIRECTION_ROW)
	 * store this value from the distance from the bottom of the view minus baseline.
	 * (Calculated as view.getMeasuredHeight() - view.getBaseline - LayoutParams.bottomMargin)
	 */
	int mMaxBaseline;

	/**
	 * Store the indices of the children views whose alignSelf property is stretch.
	 * The stored indices are the absolute indices including all children in the Flexbox,
	 * not the relative indices in this flex line.
	 */
	List<Integer> mIndicesAlignSelfStretch = new ArrayList<>();

	/**
	 * @return the distance in pixels from the top edge of this view's parent
	 * to the top edge of this FlexLine.
	 */
	public int getLeft() {
		return mLeft;
	}

	/**
	 * @return the distance in pixels from the top edge of this view's parent
	 * to the top edge of this FlexLine.
	 */
	public int getTop() {
		return mTop;
	}

	/**
	 * @return the distance in pixels from the right edge of this view's parent
	 * to the right edge of this FlexLine.
	 */
	public int getRight() {
		return mRight;
	}

	/**
	 * @return the distance in pixels from the bottom edge of this view's parent
	 * to the bottom edge of this FlexLine.
	 */
	public int getBottom() {
		return mBottom;
	}

	/**
	 * @return the size of the flex line in pixels along the main axis of the flex container.
	 */
	public int getMainSize() {
		return mMainSize;
	}

	/**
	 * @return the size of the flex line in pixels along the cross axis of the flex container.
	 */
	public int getCrossSize() {
		return mCrossSize;
	}

	/**
	 * @return the count of the views contained in this flex line.
	 */
	public int getItemCount() {
		return mItemCount;
	}

	/**
	 * @return the count of the views whose visibilities are not gone in this flex line.
	 */
	public int getLayoutVisibleItemCount() {
			return mItemCount - mGoneItemCount;
	}

	/**
	 * @return the sum of the flexGrow properties of the children included in this flex line
	 */
	public float getTotalFlexGrow() {
		return mTotalFlexGrow;
	}

	/**
	 * @return the sum of the flexShrink properties of the children included in this flex line
	 */
	public float getTotalFlexShrink() {
		return mTotalFlexShrink;
	}
}