import java.awt.Color;

public class BaseStation extends Terminal
{
    private MobileStation curSender;

    class State
    {
    static final int idle = 0;
    static final int SIFS_before_emitCTS = 1;
    static final int emitCTS = 2;
    static final int SIFS_before_rcvPKT = 3;
    static final int rcvPKT = 4;
    static final int SIFS_before_emitACK = 5;
    static final int emitACK = 6;
    }

    public BaseStation(String string, SimTimer simtimer) {
    super(string, simtimer);
    }


    //Implement Protocol State Machine
    private void activeAction() {
        switch (state) {
            case State.idle :
                break;
            case State.SIFS_before_emitCTS :
                if (elapsedTime(3))
                    changeState(State.emitCTS);
                break;

            case State.emitCTS :
                if (elapsedTime(15)) {
                    myChannel.receptionAction(emmitedPacket);
                    changeState(State.SIFS_before_rcvPKT);
                }
                break;
            case State.SIFS_before_rcvPKT :
                if (elapsedTime(3)) {
                    changeState(State.rcvPKT);
                }
                break;
            case State.rcvPKT :
                if (elapsedTime(61)) {
                    changeState(State.idle);
                }
                break;
            case State.SIFS_before_emitACK :
                if (elapsedTime(3)) {
                    changeState(State.emitACK);
                }
                break;
            case State.emitACK :
                if (elapsedTime(10)) {
                    System.out.println("Sending ACK to " + emmitedPacket.getOwner().toString());
                    myChannel.receptionAction(emmitedPacket);
                    changeState(State.idle);
                }
                break;
        }
    }

    protected void changeState(int i) {
    super.changeState(i);
    if (i == 2)
        emmitedPacket = new Packet(curSender, 2);
    if (i == 6)
        emmitedPacket = new Packet(curSender, 4);
    }

    public boolean emmiting() {
    return state == 6 || state == 2;
    }

    protected Color getChannelColor() {
    return Color.white;
    }

    protected Color getStateColor() {
    Color color = Color.white;
    switch (state) {
    case 2:
        color = new Color(0, 0, 128);
        break;
    case 6:
        color = new Color(128, 0, 0);
        break;
    }
    return color;
    }

    // Implement Protocol State Machine (Receive portion)
    public void receptionAction(Packet packet) {
        System.out.println("Received a packet from " + packet.getOwner().toString());
        if (state == State.idle) {
            System.out.println("BaseStation is in state idle");
            System.out.println("The packet is corrupted: " + packet.getCorrupted(this));
            if (packet.getType() == Packet.RTS && !packet.getCorrupted(this)) {
                System.out.println("BaseStation sending CTS to " + packet.getOwner().toString());
                curSender = packet.getOwner();
                changeState(State.SIFS_before_emitCTS);
            }
        }
        if (packet.getType() == Packet.PKT && packet.getOwner() == curSender) {
            System.out.println("Received data from " + packet.getOwner().toString());
            changeState(State.SIFS_before_emitACK);
        }
    }

    public void update() {
    activeAction();
    this.graphicUpdate();
    }
}