/*
 * Copyright (C) 2012 The Android Open Source Project
 *
 * 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.android.uiautomator;

import com.android.uiautomator.tree.BasicTreeNode;
import com.android.uiautomator.tree.BasicTreeNode.IFindNodeListener;
import com.android.uiautomator.tree.UiHierarchyXmlLoader;
import com.android.uiautomator.tree.UiNode;

import java.awt.Rectangle;

import java.io.File;
import java.util.List;

import org.apache.log4j.Logger;

public class UiAutomatorModel {
	private BasicTreeNode mRootNode;
	private BasicTreeNode mSelectedNode;
	private Rectangle mCurrentDrawingRect;
	private List<Rectangle> mNafNodes;

	// determines whether we lookup the leaf UI node on mouse move of screenshot image
	private boolean mExploreMode = true;

	private boolean mShowNafNodes = false;

	public UiAutomatorModel(File xmlDumpFile) {
		Logger.getLogger(this.getClass() ).debug("/****UiAutomatorModel***/");
		UiHierarchyXmlLoader loader = new UiHierarchyXmlLoader();
		BasicTreeNode rootNode = loader.parseXml(xmlDumpFile.getAbsolutePath());
		if (rootNode == null) {
			Logger.getLogger(this.getClass() ).debug("/****UiAutomatorModel. Error While Loading File : Invalid ui automator hierarchy file***/");
			throw new IllegalArgumentException("Invalid ui automator hierarchy file.");
		}

		mNafNodes = loader.getNafNodes();
		if (mRootNode != null) {
			mRootNode.clearAllChildren();
		}

		mRootNode = rootNode;
		mExploreMode = true;
	}

	public BasicTreeNode getXmlRootNode() {
		return mRootNode;
	}

	public BasicTreeNode getSelectedNode() {
		return mSelectedNode;
	}

	/**
	 * change node selection in the Model recalculate the rect to highlight,
	 * also notifies the View to refresh accordingly
	 *
	 * @param node
	 */
	public void setSelectedNode(BasicTreeNode node) {
		mSelectedNode = node;
		if (mSelectedNode instanceof UiNode) {
			UiNode uiNode = (UiNode) mSelectedNode;
			mCurrentDrawingRect = new Rectangle(uiNode.x, uiNode.y, uiNode.width, uiNode.height);
		} else {
			mCurrentDrawingRect = null;
		}
	}

	public Rectangle getCurrentDrawingRect() {
		return mCurrentDrawingRect;
	}

	/**
	 * Do a search in tree to find a leaf node or deepest parent node containing the coordinate
	 *
	 * @param x
	 * @param y
	 * @return
	 */
	public BasicTreeNode updateSelectionForCoordinates(int x, int y) {
		BasicTreeNode node = null;

		if (mRootNode != null) {
			MinAreaFindNodeListener listener = new MinAreaFindNodeListener();
			boolean found = mRootNode.findLeafMostNodesAtPoint(x, y, listener);
			if (found && listener.mNode != null && !listener.mNode.equals(mSelectedNode)) {
				node = listener.mNode;
			}
		}

		return node;
	}

	public boolean isExploreMode() {
		return mExploreMode;
	}

	public void toggleExploreMode() {
		mExploreMode = !mExploreMode;
	}

	public void setExploreMode(boolean exploreMode) {
		mExploreMode = exploreMode;
	}

	private static class MinAreaFindNodeListener implements IFindNodeListener {
		BasicTreeNode mNode = null;
		@Override
		public void onFoundNode(BasicTreeNode node) {
			if (mNode == null) {
				mNode = node;
			} else {
				if ((node.height * node.width) < (mNode.height * mNode.width)) {
					mNode = node;
				}
			}
		}
	}

	public List<Rectangle> getNafNodes() {
		return mNafNodes;
	}

	public void toggleShowNaf() {
		mShowNafNodes = !mShowNafNodes;
	}

	public boolean shouldShowNafNodes() {
		return mShowNafNodes;
	}
}