unit MainFrm;

interface
uses
  System.Classes,
  System.SysUtils,
  Vcl.Controls,
  Vcl.ExtCtrls,
  Vcl.Forms,
  Vcl.StdCtrls,

  CPort;


type
  TMainForm = class(TForm)
    PortComboBox: TComboBox;
    RefreshPortsButton: TButton;
    Button1: TButton;
    Button2: TButton;
    Button3: TButton;
    Button4: TButton;
    Button5: TButton;
    Button6: TButton;
    Edit1: TEdit;
    Button7: TButton;
    Edit2: TEdit;

    procedure FormCreate(Sender: TObject);
    procedure RefreshPortsButtonClick(Sender: TObject);
    procedure Button1Click(Sender: TObject);
    procedure Button2Click(Sender: TObject);
    procedure Button3Click(Sender: TObject);
    procedure Button4Click(Sender: TObject);
    procedure Button5Click(Sender: TObject);
    procedure Button6Click(Sender: TObject);
    procedure Button7Click(Sender: TObject);
  private
    FComPort: TComPort;
    FReceived: string;
    FOnResponse: TProc<string>;

    procedure OnReceiveChar(Sender: TObject; Count: Integer);

    procedure RefreshPorts;
    procedure SendCommand(const ACommand: string; AOnResponse: TProc<string>);

    property ComPort: TComPort read FComPort;
  end;


implementation

uses
  System.RegularExpressions, Vcl.Dialogs;

{$R *.dfm}

procedure TMainForm.Button1Click(Sender: TObject);
begin
  SendCommand('>Info',
    procedure(Response: string)
    var
      match: TMatch;

    begin
      match := TRegEx.Match(Response, '<Info:Fans=(\d+)', [roSingleLine]);
      if match.Success then
        ShowMessage('Connected, got ' + match.Groups[1].Value + ' fan(s)')
      else
        ShowMessage('Invalid response: ' + Response);
    end);
end;

procedure TMainForm.Button2Click(Sender: TObject);
begin
  Edit1.Text := '255';
  SendCommand('>SetFans:255,0',
    procedure(Response: string)
    begin
      if Response <> '<SetFans' then
        ShowMessage('Invalid response: ' + Response);
    end);
end;

procedure TMainForm.Button3Click(Sender: TObject);
begin
  Edit2.Text := '255';
  SendCommand('>SetFans:0,255',
    procedure(Response: string)
    begin
      if Response <> '<SetFans' then
        ShowMessage('Invalid response: ' + Response);
    end);
end;

procedure TMainForm.Button4Click(Sender: TObject);
begin
  Edit1.Text := '0';
  Edit2.Text := '0';
  SendCommand('>SetFans:0,0',
    procedure(Response: string)
    begin
      if Response <> '<SetFans' then
        ShowMessage('Invalid response: ' + Response);
    end);
end;

procedure TMainForm.Button5Click(Sender: TObject);
begin
  Edit1.Text := '128';
  SendCommand('>SetFans:128,0',
    procedure(Response: string)
    begin
      if Response <> '<SetFans' then
        ShowMessage('Invalid response: ' + Response);
    end);
end;

procedure TMainForm.Button6Click(Sender: TObject);
begin
  Edit2.Text := '128';
  SendCommand('>SetFans:0,128',
    procedure(Response: string)
    begin
      if Response <> '<SetFans' then
        ShowMessage('Invalid response: ' + Response);
    end);
end;

procedure TMainForm.Button7Click(Sender: TObject);
begin
  SendCommand('>SetFans:' + Edit1.Text + ',' + Edit2.Text,
    procedure(Response: string)
    begin
      if Response <> '<SetFans' then
        ShowMessage('Invalid response: ' + Response);
    end);
end;

procedure TMainForm.FormCreate(Sender: TObject);
begin
  RefreshPorts;
  PortComboBox.ItemIndex := Pred(PortComboBox.Items.Count);
end;


procedure TMainForm.RefreshPortsButtonClick(Sender: TObject);
begin
  RefreshPorts;
end;


procedure TMainForm.RefreshPorts;
var
  currentPort: string;

begin
  currentPort := '';
  if PortComboBox.ItemIndex > -1 then
    currentPort := PortComboBox.Items[PortComboBox.ItemIndex];

  EnumComPorts(PortComboBox.Items);

  if Length(currentPort) > 0 then
    PortComboBox.ItemIndex := PortComboBox.Items.IndexOf(currentPort);
end;


procedure TMainForm.OnReceiveChar(Sender: TObject; Count: Integer);
var
  data: string;
  terminatorPos: Integer;

begin
  (Sender as TComPort).ReadStr(data, Count);
  FReceived := FReceived + data;

  terminatorPos := AnsiPos(#10, FReceived);
  if terminatorPos > 0 then
  begin
    // Since the protocol is quite synchronous, this is good enough for now
    SetLength(FReceived, terminatorPos - 1);
    if Assigned(FOnResponse) then
      FOnResponse(FReceived);

    FReceived := '';
    FOnResponse := nil;
  end;
end;


procedure TMainForm.SendCommand(const ACommand: string; AOnResponse: TProc<string>);
begin
  if not Assigned(FComPort) then
  begin
    FComPort := TComPort.Create(Self);
    FComPort.Port := PortComboBox.Items[PortComboBox.ItemIndex];
    FComPort.BaudRate := br19200;
    FComPort.OnRxChar := OnReceiveChar;
    FComPort.Open;
  end;

  FOnResponse := AOnResponse;
  ComPort.WriteStr(ACommand + #10);
end;

end.