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package pad.prac1;
import java.util.Observable;
import java.util.Observer;
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import java.util.Scanner;
import java.util.regex.Pattern;
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public class Console implements Observer
{
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private Coordinate currentXY;
//private int numRows;
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private int numCols;
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public Console()
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{
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currentXY = new Coordinate(0,0);
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}
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public void moveCursorTo(int pos, int currentPos, int length)
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{
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updateTermSize();
updateCurrentPos();
if(pos > currentPos)
{
while((pos-currentPos) >= numCols)
{
currentPos += numCols - currentXY.x()+1;
System.out.print((char)EditableBufferedReader.ESC);
System.out.print((char)EditableBufferedReader.ESC_SEQ);
System.out.print((char)EditableBufferedReader.DOWN);
currentXY.setY(currentXY.y()+1);
System.out.print((char)EditableBufferedReader.ESC);
System.out.print((char)EditableBufferedReader.ESC_SEQ);
System.out.print(numCols-1);
System.out.print((char)EditableBufferedReader.BACKWARD);
currentXY.setX(1);
}
if(pos > currentPos)
{
System.out.print((char)EditableBufferedReader.ESC);
System.out.print((char)EditableBufferedReader.ESC_SEQ);
System.out.print(pos - currentPos);
System.out.print((char)EditableBufferedReader.FORWARD);
}
}
else if(pos < currentPos)
{
System.err.println(currentPos);
System.err.println(pos);
System.err.println(currentXY);
while((currentPos-pos) >= currentXY.x())
{
currentPos -= currentXY.x();
System.out.print((char)EditableBufferedReader.ESC);
System.out.print((char)EditableBufferedReader.ESC_SEQ);
System.out.print((char)EditableBufferedReader.UP);
currentXY.setY(currentXY.y()-1);
System.out.print((char)EditableBufferedReader.ESC);
System.out.print((char)EditableBufferedReader.ESC_SEQ);
System.out.print(numCols);
System.out.print((char)EditableBufferedReader.FORWARD);
currentXY.setX(numCols);
}
if(pos < currentPos)
{
System.out.print((char)EditableBufferedReader.ESC);
System.out.print((char)EditableBufferedReader.ESC_SEQ);
System.out.print(currentPos-pos);
System.out.print((char)EditableBufferedReader.BACKWARD);
}
}
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}
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public void updateCurrentPos()
{
Coordinate pos = getCurrentPos();
currentXY.setY(pos.y());
currentXY.setX(pos.x());
}
public void updateTermSize()
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{
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System.out.print((char)EditableBufferedReader.ESC);
System.out.print((char)EditableBufferedReader.ESC_SEQ);
System.out.print("18t");
Pattern pattern = Pattern.compile("8;(\\d+);(\\d+)");
Scanner scanner = new Scanner(System.in);
scanner.findWithinHorizon(pattern,0);
numCols = Integer.parseInt(scanner.match().group(2));
//numRows = Integer.parseInt(scanner.match().group(1));
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}
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public Coordinate getCurrentPos()
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{
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System.out.print((char)EditableBufferedReader.ESC);
System.out.print((char)EditableBufferedReader.ESC_SEQ);
System.out.print("6n");
Pattern pattern = Pattern.compile("(\\d+);(\\d+)");
Scanner scanner = new Scanner(System.in);
scanner.findWithinHorizon(pattern,0);
int x = Integer.parseInt(scanner.match().group(2));
int y = Integer.parseInt(scanner.match().group(1));
return new Coordinate(x,y);
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}
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private void insertSpace()
{
System.out.print((char)EditableBufferedReader.ESC);
System.out.print((char)EditableBufferedReader.ESC_SEQ);
System.out.print((char)EditableBufferedReader.INS_SPACE);
}
private void delChar()
{
System.out.print((char)EditableBufferedReader.ESC);
System.out.print((char)EditableBufferedReader.ESC_SEQ);
System.out.print((char)EditableBufferedReader.DEL_CHAR);
}
public void addChar(char c, Line line)
{
if(line.getCursorPosition() != line.length()+1)
{
insertSpace();
}
System.out.print(c);
}
public void update(Observable obs, Object arg)
{
Line line = (Line)obs;
Command cmd = (Command)arg;
switch(cmd.getType())
{
case Command.INSERT_CHAR:
addChar((char)cmd.getValue(),line);
break;
case Command.DELETE_CHAR:
delChar();
break;
case Command.MOVE_CURSOR:
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moveCursorTo(cmd.getValue(),line.getCursorPosition(),line.length());
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break;
}
}
}
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