using System;
using System.Drawing;
using System.Windows.Forms;

public class WaterTank : Panel {
	
	private WaterLevelSensor _highLevelSensor;
	private WaterLevelSensor _lowLevelSensor;
	private Pen _whitePen;
	private Pen _bluePen;
  private int _penWidth;
	private int _currentWaterLevel;
	private int _lastWaterLevel;
	private int _tankCapacity;
  private Point _bottomLeft;
  private Point _bottomRight;
  private Pump _itsPump;
  private Graphics _graphics;
  
  public int WaterLevel {
		get {return _currentWaterLevel; }
	}
	
	public int FillRate {
		get {return _itsPump.PumpingCapacity; }
	}
	
	public int HighSetPoint {
		get { return _highLevelSensor.SetPoint; }
		set { _highLevelSensor.SetPoint = value; }
	}
	
	public int LowSetPoint {
		get { return _lowLevelSensor.SetPoint; }
		set { _lowLevelSensor.SetPoint = value; }
	}
	
	public WaterTank(int x, int y, int width, int height, int tankCapacity, int pumpCapacity){
		this.InitializeComponents(x, y, width, height, tankCapacity, pumpCapacity);
	}
	
	public WaterTank():this(100, 100, 100, 500, 10000, 1000){ }
	
	private void InitializeComponents(int x, int y, int width, int height, int tankCapacity, int pumpCapacity){
		
		this.Bounds = new Rectangle(x, y, width, height);
	  this.BackColor = Color.White;
		this.BorderStyle = BorderStyle.Fixed3D;
		_graphics = this.CreateGraphics();
		_bottomLeft = new Point(0, height);
		_bottomRight = new Point(width, height);
		_tankCapacity = tankCapacity;
		_currentWaterLevel = 0;
		_itsPump = new Pump(this, pumpCapacity);
		_penWidth = this.Height/(_tankCapacity/_itsPump.PumpingCapacity);
		if(_penWidth < 1) _penWidth = 1;
    _whitePen = new Pen(Color.White, _penWidth);
		_bluePen = new Pen(Color.Blue, _penWidth);
		_highLevelSensor = new WaterLevelSensor(tankCapacity - pumpCapacity, 0);
		_highLevelSensor.SensorMode = WaterLevelSensor.Mode.HighLevelIndicator;
		_highLevelSensor.Fill += new WaterLevelEventHandler(_itsPump.FillTankEventHandler);
		_highLevelSensor.Full += new WaterLevelEventHandler(_itsPump.FullTankEventHandler);
		_lowLevelSensor = new WaterLevelSensor(pumpCapacity, 0);
		_lowLevelSensor.SensorMode = WaterLevelSensor.Mode.LowLevelIndicator;
		_lowLevelSensor.Drain += new WaterLevelEventHandler(_itsPump.DrainTankEventHandler);
		_lowLevelSensor.Empty += new WaterLevelEventHandler(_itsPump.EmptyTankEventHandler);
	}
	
	public void ChangeWaterLevel(int amount){
		_lowLevelSensor.WaterLevelChange(amount);
		_highLevelSensor.WaterLevelChange(amount);
		_currentWaterLevel += amount;
		_lastWaterLevel = _currentWaterLevel;
		this.ChangeVisualLevel(amount);	
	}

	private void ChangeVisualLevel(int amount){
		if(amount > 0){	    
			_graphics.DrawLine(_bluePen, _bottomLeft, _bottomRight);
			_bottomLeft.Y -= _penWidth;
			_bottomRight.Y -= _penWidth;
			
		}else{
			_graphics.DrawLine(_whitePen, _bottomLeft, _bottomRight);
			_bottomLeft.Y += _penWidth;
			_bottomRight.Y += _penWidth;
			Delay(30000000);
		}
		
	} // end ChangeVisualLevel method
	
	private void Delay(long ticks){
		for(long i = 0; i<ticks; i++){
			;
		}
	}
	
} // end class definition