package application;

import javafx.fxml.FXML;
import javafx.scene.control.TextArea;
import javafx.scene.control.TextField;
import javafx.stage.Stage;
import textgen.MarkovTextGenerator;

public class MarkovController {
	private Stage dialogStage;
	private MainApp mainApp;
	private MarkovTextGenerator mtg;

	
	@FXML
	private TextField numWordsField;
	
	@FXML
	private TextArea resultBox;
	
	
	@FXML
	private void initialize() {
	}
	
	/**
 * Sets the stage of this dialog.
 * @param dialogStage
 */
 public void setDialogStage(Stage dialogStage) {
 this.dialogStage = dialogStage;
 }

 /**
 * Called when the user clicks OK.
 */
 @FXML
 private void handleGenerate() {
 	if(isInputValid()) {
 		String mText = mtg.generateText(Integer.parseInt(numWordsField.getText()));
 		setResult(mText);
 	}
 	else {
 		// display error pop-up
 		mainApp.showInputErrorDialog("Invalid input.\nMust enter number > 0.");
 	}
 
 }
 
 /**
 * Is called by the main application to give a reference back to itself.
 * 
 * @param mainApp
 */
	public void setMainApp(MainApp mainApp) {
		this.mainApp = mainApp;
	}
	
	
	public void setMTG(textgen.MarkovTextGenerator mtg) {
		this.mtg = mtg;
	}
 
	public void setResult(String result) {
		resultBox.setText(result);
	}
	
 @FXML
 private void handleCancel() {
 	dialogStage.close();
 }
 
 
 /**
 * Checks if number of words input is valid.
 * 
 * valid == Not empty, numeric, >0
 * 
 * @return true if valid, false if not
 */
 private boolean isInputValid() {
 	String numString = numWordsField.getText();
 	return !(numString.equals("") || !isInteger(numString)
 			|| (Integer.parseInt(numString) <= 0));
 }
 
 /**
 * Checks if string is integer
 * 
 * @param str
 * @return true if string is able to be parsed as an integer.
 */
 public static boolean isInteger(String str) { 
 try { 
 Integer.parseInt(str); 
 } 
 catch(NumberFormatException nfe) { 
 return false; 
 } 

 return true; 
 }

}