unit ULight;
interface

type
  TLight = class
    private
      Enabled:      boolean;
      Light:        array[0..7] of boolean;
      LightTime:    array[0..7] of real;    // time to stop, need to call update to change state
      LastTime:     real;
    public
      constructor Create;
      procedure Enable;
      procedure SetState(State: integer);
      procedure AutoSetState;
      procedure TurnOn;
      procedure TurnOff;
      procedure LightOne(Number: integer; Time: real);
      procedure Refresh;
  end;

var
  Light:      TLight;

const
  Data    = $378; // default port address
  Status  = Data + 1;
  Control = Data + 2;

implementation

uses
  SysUtils, zlportio, UTime;

constructor TLight.Create;
begin
  Enabled := false;
end;

procedure TLight.Enable;
begin
  Enabled := true;
  LastTime := GetTime;
end;

procedure TLight.SetState(State: integer);
begin
  if Enabled then
    PortWriteB($378, State);
end;

procedure TLight.AutoSetState;
var
  State:    integer;
begin
  if Enabled then begin
    State := 0;
    if Light[0] then State := State + 2;
    if Light[1] then State := State + 1;
    // etc
    SetState(State);
  end;
end;

procedure TLight.TurnOn;
begin
  if Enabled then
    SetState(3);
end;

procedure TLight.TurnOff;
begin
  if Enabled then
    SetState(0);
end;

procedure TLight.LightOne(Number: integer; Time: real);
begin
  if Enabled then begin
    if Light[Number] = false then begin
      Light[Number] := true;
      AutoSetState;
    end;

    LightTime[Number] := GetTime + Time/1000; // [s]
  end;
end;

procedure TLight.Refresh;
var
  Time:     real;
  TimeSkip: real;
  L:        integer;
begin
  if Enabled then begin
    Time := GetTime;
    TimeSkip := Time - LastTime;
    for L := 0 to 7 do begin
      if Light[L] = true then begin
        if LightTime[L] > Time then begin
          // jest jeszcze zapas - bez zmian
          //LightTime[L] := LightTime[L] - TimeSkip;
        end else begin
          // czas minal
          Light[L] := false;
        end;
      end;
    end;
    LastTime := Time;
    AutoSetState;
  end;
end;

end.