package org.simantics.spreadsheet.ui;

import java.awt.event.FocusEvent;
import java.awt.event.FocusListener;
import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;

import javax.swing.JTextField;

import org.simantics.databoard.Bindings;
import org.simantics.databoard.binding.mutable.Variant;
import org.simantics.spreadsheet.CellEditor;
import org.simantics.spreadsheet.ClientModel;
import org.simantics.spreadsheet.Spreadsheets;

public class ExpressionTextListener implements FocusListener, KeyListener {

	final private JTextField text;
	final private CellEditor editor;
	
	String undoPoint = null;
	int currentRow;
	int currentColumn;
	
	public ExpressionTextListener(JTextField text, CellEditor editor) {
		this.text = text;
		this.editor = editor;
	}
	
	void setCell(String text, int row, int column) {
		this.text.setText(text);
		this.undoPoint = text;
		this.currentRow = row;
		this.currentColumn = column;
	}
	
	void apply() {
		if(undoPoint == null) {
			// No selection
			return;
		}
		String current = text.getText();
		if(current.equals(undoPoint)) return;
		if(currentRow == -1 || currentColumn == -1) return;
		
		if (current.startsWith("=")) {
		    editor.edit(null, Spreadsheets.cellName(currentRow, currentColumn), ClientModel.CONTENT_EXPRESSION, current, Bindings.STRING, null);
		} else {
		    editor.edit(null, Spreadsheets.cellName(currentRow, currentColumn), Variant.ofInstance(current), null);
		}
		undoPoint = current;
		
	}
	
	void cancel() {
		if(undoPoint != null)
			text.setText(undoPoint);
	}
	
	@Override
	public void keyTyped(KeyEvent e) {
	}
	
	@Override
	public void keyReleased(KeyEvent e) {
		if(e.getKeyCode() == KeyEvent.VK_ENTER) {
			apply();
		}
		if(e.getKeyCode() == KeyEvent.VK_ESCAPE) {
			cancel();
		}
	}
	
	@Override
	public void keyPressed(KeyEvent e) {
	}
	
	@Override
	public void focusGained(FocusEvent e) {
	}

	@Override
	public void focusLost(FocusEvent e) {
		apply();
	}
	
}