/*WordCount.java
Application determines how many times a word has occurred in the text given
*/
import javax.swing.JPanel;
import javax.swing.JFrame;
import javax.swing.JButton;
import javax.swing.JTextArea;
import javax.swing.JLabel;
import java.awt.BorderLayout;
import java.awt.GridLayout;
import javax.swing.JScrollPane;
import java.awt.Insets;
import java.awt.Color;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.Map;
import java.util.HashMap;
import java.util.Set;
import java.util.TreeSet;
import java.util.StringTokenizer;
public class WordCount extends JFrame{
	private JPanel buttonsPanel;
	private JPanel topPanel;
	private JTextArea textInput;
	private JTextArea textOutput;
	private JButton processButton;
	private JButton clearButton;
	private JLabel instructions;
	private BorderLayout frameLayout;
	private BorderLayout topPanelLayout;
	private GridLayout buttonsPanelLayout;
	private String stringToTest;//holds string pasted in textarea
	private String[] tokens;//array of tokenized strings
	Map<String,Integer> mp = new HashMap<String, Integer>();//declaring a map object
	//constructor
	public WordCount(){
		super("Word count application");
		JPanel buttonsPanel = new JPanel();//holds the two buttons
		JPanel topPanel = new JPanel();//holds the textArea and jlabel
		JTextArea textInput = new JTextArea(10,15);//holds the input text
		JTextArea textOutput = new JTextArea(10,15);//hold the output text
		stringToTest = "";//initialize to empty string
		JButton processButton = new JButton("Count");//action abutton
		JButton clearButton = new JButton("Clear");//to clear textArea
		JLabel instructions = new JLabel("Copy and paste text in the below text area, click Count to count the words.\n");//holding instructions
		BorderLayout frameLayout = new BorderLayout();//for JFrame
		BorderLayout topPanelLayout = new BorderLayout();//for top level panel
		GridLayout buttonsPanelLayout = new GridLayout(1,2,5,5);//for buttons
		setLayout(frameLayout);//set layout of Frame
		topPanel.setLayout(topPanelLayout);//set topPanel layout
		topPanel.add(instructions, BorderLayout.NORTH);//add JLabel to topPanel
		instructions.setOpaque(true);//need this to be able to change the colour
		instructions.setBackground(Color.CYAN);
		topPanel.add(new JScrollPane(textInput), BorderLayout.CENTER);//add textInput to topPanel
		buttonsPanel.setLayout(buttonsPanelLayout);//set buttonsPanel layout
		buttonsPanel.add(processButton);//add processButton to panel
		buttonsPanel.add(clearButton);//add clearButton to panel
		add(topPanel, BorderLayout.NORTH);//add topPanel to JFrame
		add(buttonsPanel, BorderLayout.CENTER);//add buttonsPanel to JFrame
		add(new JScrollPane(textOutput), BorderLayout.SOUTH);//add textOutput to JFrame
		textOutput.setMargin(new Insets(5,5,5,5));//sets margins inside the element
		textInput.setMargin(new Insets(5,5,5,5));//sets margins inside the element
		textInput.setText(" ");//initialize to empty string
		textOutput.setText(" ");//initialize to empty string
		ProcessButtonHandling handler1 = new ProcessButtonHandling();
		ClearButtonHandling handler2 = new ClearButtonHandling();
		processButton.addActionListener(handler1);
		clearButton.addActionListener(handler2);
	}//end of WordCount constructor
	public String getString(){
		return stringToTest;
	}
	//inner class for event handlings
	private class ProcessButtonHandling implements ActionListener{
		public void actionPerformed(ActionEvent event){
			stringToTest = textInput.getText();
			processString(getString());//call function to split string
			mapWords();//count words and place results in the hashmap
			printMap();//print the map values and keys in the textArea
		}//end of actionPerformed
	}//end of inner class
	private class ClearButtonHandling implements ActionListener{
		public void actionPerformed(ActionEvent event){

		}//end of actionPerformed
	}//end of inner class
	public void processString(String testingString){
		//String[] tokens = testingString.split("(?=[,.])|\\s+");
		testingString = testingString.replaceAll("[,.;:]","");//remove the characters in brackets and replace them with nothing
		tokens = testingString.split(" ");//split string using space as delimiter
		/* System.out.printf("Number of elements: %d\nTokens are \n", tokens.length);
		//print to test
		for(String token : tokens){
			System.out.println(token);
		}	 */
	}
	public void mapWords(){
		for(int i = 0; i < tokens.length; i++){
			if(mp.containsKey(tokens[i])){
				//increment Integer
				mp.put(tokens[i], mp.get(tokens[i]) + 1);//add it to the hashmap and increment integer
			}
			else{
				mp.put(tokens[i],1);//add it to the hashmap
			}
		}
	}
	public void printMap(){
		for(Map.Entry<String, Integer> entry : mp.entrySet()){//loop thru map to print data
			//System.out.println("Key = " + entry.getKey() + ", Value = " + entry.getValue());
			textOutput.append("Key = " + entry.getKey() + ", Value = " + entry.getValue());
		}
	}

}//end of WordCount