with Ada.Text_IO;
use Ada.Text_IO;

procedure Traffic is
    type Lamp is (Piros,PirosSarga,Zold,Sarga);
    type Pstring is access String;

protected Crossroad is
    entry Cross(D : Duration);
    procedure Wake_Up;
end Crossroad;
task type Signal;

task body Signal is
begin
    Crossroad.Wake_Up;
end Signal;

    type PSignal is access Signal;

protected Lamps is
    function Color return Lamp;
    procedure Switch;
private
    ActColor : Lamp := Piros;
    LSignal : PSignal;
end Lamps;

protected body Lamps is
    function Color return Lamp is
    begin
        return ActColor;
    end Color;
    procedure Switch is
    begin
        LSignal := new Signal;
        if ActColor = Sarga then
            ActColor := Piros;
            Put_Line(Lamp'Image(ActColor));
        else
            ActColor := Lamp'Succ(ActColor);
            Put_Line(Lamp'Image(ActColor));
        end if;
    end Switch;
end Lamps;

task Controller is
    entry Stop;
end Controller;

task body Controller is
    Stopped : Boolean := False;
begin
    while not Stopped loop
        select
            accept Stop;
            Stopped := True;
        else
            Lamps.Switch;
            delay 3.0;
            Lamps.Switch;
            delay 1.0;
            Lamps.Switch;
            delay 3.0;
            Lamps.Switch;
            delay 2.0;
        end select;
    end loop;
end Controller;

protected body Crossroad is
    entry Cross(D : Duration) when Lamps.Color = Zold is
    begin
        delay D;
    end Cross;
    procedure Wake_Up is
    begin
        null;
    end Wake_Up;
end Crossroad;

task type Vehicle(N : Pstring);

task body Vehicle is
begin
        Put_Line(N.all & " Car Is Waiting At The Lamp");
    select
        Crossroad.Cross(1.0);
    else
        Crossroad.Cross(3.0);
    end select;
        Put_Line(N.all & " Car Passed Over");
end Vehicle;

    type PVehicle is access Vehicle;
    type VehicleAr is array (1..30) of PVehicle;

    Vehicles : VehicleAr;
    P : Pstring;
begin
    for I in 1..30 loop
        P := new String'(Integer'Image(I));
        delay 0.5;
        Vehicles(I) := new Vehicle(P);
    end loop;
    Skip_Line;
    Controller.Stop;
end Traffic;