/*
 * Copyright 2012 LinkedIn Corp.
 * 
 * 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 azkaban.flow;

import java.awt.geom.Point2D;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

public class Edge {
	private final String sourceId;
	private final String targetId;
	private Node source;
	private Node target;
	private String error;
	
	// Useful in rendering.
	private String guideType;
	private List<Point2D> guideValues;

	public Edge(String fromId, String toId) {
		this.sourceId = fromId;
		this.targetId = toId;
	}

	public Edge(Edge clone) {
		this.sourceId = clone.sourceId;
		this.targetId = clone.targetId;
		this.error = clone.error;
	}
	
	public String getId() {
		return getSourceId() + ">>" + getTargetId();
	}

	public String getSourceId() {
		return sourceId;
	}

	public String getTargetId() {
		return targetId;
	}
	
	public void setError(String error) {
		this.error = error;
	}
	
	public String getError() {
		return this.error;
	}
	
	public boolean hasError() {
		return this.error != null;
	}
	
	public Node getSource() {
		return source;
	}

	public void setSource(Node source) {
		this.source = source;
	}

	public Node getTarget() {
		return target;
	}

	public void setTarget(Node target) {
		this.target = target;
	}

	public String getGuideType() {
		return guideType;
	}
	
	public List<Point2D> getGuideValues() {
		return guideValues;
	}

	public void setGuides(String type, List<Point2D> values) {
		this.guideType = type;
		this.guideValues = values;
	}
	
	public Object toObject() {
		HashMap<String, Object> obj = new HashMap<String, Object>();
		obj.put("source", getSourceId());
		obj.put("target", getTargetId());
		if (error != null) {
			obj.put("error", error);
		}
		if (guideValues != null) {
			HashMap<String, Object> lineGuidesObj = new HashMap<String, Object>();
			lineGuidesObj.put("type", guideType);
			
			ArrayList<Object> guides = new ArrayList<Object>();
			for (Point2D point: this.guideValues) {
				HashMap<String, Double> pointObj = new HashMap<String, Double>();
				pointObj.put("x", point.getX());
				pointObj.put("y", point.getY());
				guides.add(pointObj);
			}
			lineGuidesObj.put("values", guides);
			
			obj.put("guides",lineGuidesObj);
		}
		
		return obj;
	}
	
	@SuppressWarnings("unchecked")
	public static Edge fromObject(Object obj) {
		HashMap<String, Object> edgeObj = (HashMap<String,Object>)obj;
		
		String source = (String)edgeObj.get("source");
		String target = (String)edgeObj.get("target");
		
		String error = (String)edgeObj.get("error");
		
		Edge edge = new Edge(source, target);
		edge.setError(error);
		
		if (edgeObj.containsKey("guides")) {
			Map<String, Object> guideMap = (Map<String,Object>)edgeObj.get("guides");
			List<Object> values = (List<Object>)guideMap.get("values");
			String type = (String)guideMap.get("type");
			
			ArrayList<Point2D> valuePoints = new ArrayList<Point2D>();
			for (Object pointObj: values) {
				Map<String, Double> point = (Map<String,Double>)pointObj;
				
				Double x = point.get("x");
				Double y = point.get("y");
				
				valuePoints.add(new Point2D.Double(x, y));
			}
			
			edge.setGuides(type, valuePoints);
		}
		
		return edge;
	}

}
