module cdplayer;

import amplifier;
import std.stdio : writeln;
import std.conv : to;

class CdPlayer
{
    private string description;
    private int currentTrack;
    private Amplifier amplifier;
    private string title;

    this(string description, Amplifier amplifier)
    {
        this.description = description;
        this.amplifier = amplifier;
    }

    void on()
    {
        writeln(description ~ " on");
    }

    void off()
    {
        writeln(description ~ " off");
    }

    void eject()
    {
        title = null;
        writeln(description ~ " eject");
    }

    void play(string title)
    {
        this.title = title;
        currentTrack = 0;
        writeln(description ~ " playing \"" ~ title ~ "\"");
    }

    void play(int track)
    {
        if (title is null)
        {
            writeln(description ~ " can't play track " ~ currentTrack.to!string ~ " no cd inserted");
        }
        else
        {
            currentTrack = track;
            writeln(description ~ " playing track " ~ currentTrack.to!string);
        }
    }

    void stop()
    {
        currentTrack = 0;
        writeln(description ~ " stopped");
    }

    void pause()
    {
        writeln(description ~ " paused \"" ~ title ~ "\"");
    }

    override string toString() const
    {
        return description;
    }
}