import java.awt.*;

import javax.swing.*;

import java.util.*;

/**
 * The StateMap class is a subclass of JPanel. This subclass is used for creating a map of the United States that displayes
 * birthcities.
 *
 */
public class StateMap extends JPanel
{
	/**Stores keys,cities, and values, latitudes and longitudes.**/
	private HashMap<String,String> points = new HashMap<String,String>();

	/**Stores the keys (cities) to the above hash map.**/
	private ArrayList<String> keys = new ArrayList<String>();

	/**
	 * StateMap's constructor.
	 * @param mapCoordinates	Passes in a hash map of cities and corresponding latitudes and longitudes.
	 * @param keys				Passes in a list of cities.
	 */
	public StateMap(HashMap<String,String> mapCoordinates, ArrayList<String>keys)
	{
		points = mapCoordinates;
		this.keys = keys;
	}

	/**
	 * /**
	 * The paintComponent(Graphics g) method overrides the JPanel's version of this method.  This method
	 * is meant for creating a map of the United States with people's birthcities plotted on it.
	 * <P>
	 * Algorithm:<br>
	 * 1. Creates a map of the United States.<br>
	 * 2. Runs through the points hash map and gets latitudes and longitudes.<br>
	 * 3. Converts the latitude and longitude into pixel locations.<br>
	 * 4. Draws a point on the map from step 3.<br>
	 * 5. Displays the person's birth location and city name.<br>
	 * </P>
	 *
	 */

	public void paintComponent(Graphics g)
	{
		super.paintComponent(g);
		ImageIcon picture = new ImageIcon("Map1.PNG");
		picture.paintIcon(this,g,0,0);
		Font font = new Font("Comic Sans Serif", Font.PLAIN, 9);
		g.setFont(font);
		setBackground(Color.white);
		g.setColor(Color.black);

		if(!keys.isEmpty()&&!points.isEmpty())
		{
			for(int i=0; i<keys.size(); i++)
			{
				if(points.containsKey(keys.get(i)))
				{
					String latLong = points.get(keys.get(i));
					if(latLong != null)
					{
						String[]tokens = latLong.split("[,]");//changed from [; -]
						if(tokens.length == 2)
						{
							//This chunk of code converts latitudes and longitudes into doubles then
							//performes some algebra to get it to pixels then displays the point on the map
							//with the corresponding city name.
							double lat = Double.parseDouble(tokens[0]);
							double lon = Double.parseDouble(tokens[1]);

							int systemLat = (int)(690-13.7*lat);
							int systemLong = (int)(1388.2-11.1*lon);

							g.fillOval(systemLong-2,systemLat-3,5,5);
							g.drawString(keys.get(i), systemLong-2,systemLat-3);
						}
					}
				}
			}
		}
	}

}