unit LoginScherm;

interface

uses
  Winapi.Windows, Winapi.Messages, System.SysUtils, System.Variants,
  System.Classes, Vcl.Graphics,
  Vcl.Controls, Vcl.Forms, Vcl.Dialogs, Vcl.StdCtrls, Vcl.ExtCtrls,
  Main, ApplicationContext, Subscherm,
  UserAgent;

type
  TFormLogin = class(TFormSubscherm)
    Label1: TLabel;
    Label2: TLabel;
    EditGebruikersnaam: TEdit;
    Label3: TLabel;
    EditWachtwoord: TEdit;
    PanelLogIn: TPanel;
    procedure PanelLogInClick(Sender: TObject);
    procedure FormCreate(Sender: TObject);
    procedure EditGebruikersnaamChange(Sender: TObject);
    procedure PanelLogInMouseDown(Sender: TObject; Button: TMouseButton; Shift: TShiftState; X, Y: Integer);
    procedure PanelLogInMouseUp(Sender: TObject; Button: TMouseButton; Shift: TShiftState; X, Y: Integer);
    procedure PanelButtonEnableChange(Sender: TPanel);
  private
    FUserAgent: TUserAgent;
    procedure Login();
  public
    Constructor Create(AOwner: TComponent; Navigator: TFormMain; ApplicationContext: TApplicationContext; UserAgent: TUserAgent);
  end;

implementation

uses
  Util;

{$R *.dfm}

constructor TFormLogin.Create(AOwner: TComponent; Navigator: TFormMain; ApplicationContext: TApplicationContext; UserAgent: TUserAgent);
begin
  inherited Create(AOwner, Navigator, ApplicationContext);
  self.FUserAgent := UserAgent;
end;

procedure TFormLogin.FormCreate(Sender: TObject);
begin
  EditWachtwoord.PasswordChar := '*'; // Verberg paswoord
  PanelLogIn.Enabled := false;
  PanelButtonEnableChange(PanelLogIn);
end;

procedure TFormLogin.PanelLogInClick(Sender: TObject);
begin
  Login();
end;

// Indrukken van button simuleren op panel: http://www.festra.com/wwwboard/messages/1006.html
procedure TFormLogin.PanelLogInMouseDown(Sender: TObject; Button: TMouseButton; Shift: TShiftState; X, Y: Integer);
begin
  (Sender as TPanel).BevelOuter := bvLowered;
end;

procedure TFormLogin.PanelLogInMouseUp(Sender: TObject; Button: TMouseButton; Shift: TShiftState; X, Y: Integer);
begin
  (Sender as TPanel).BevelOuter := bvRaised;
end;

procedure TFormLogin.PanelButtonEnableChange(Sender: TPanel);
begin
  if Sender.Enabled then
  begin
    Sender.ParentBackground := True; // Neem kleur van parent (default)
    Sender.Font.Color := clWhite;
  end
  else
  begin
    Sender.ParentBackground := false;
    // Neem kleur van parent en maak donkerder
    Sender.Color := TColor(TUtilColorLightener.LightenColor(Vcl.Graphics.ColorToRGB(PanelLogIn.Parent.Brush.Color), 70));
    Sender.Font.Color := clGray;
  end;

end;

procedure TFormLogin.EditGebruikersnaamChange(Sender: TObject);
begin
  // We kijken enkel naar gebruikersnaam, want leeg ww zou geldig kunnen zijn
  PanelLogIn.Enabled := (Sender as TEdit).Text <> EmptyStr;
  PanelButtonEnableChange(PanelLogIn);
end;

procedure TFormLogin.Login();
var
  ErrorMessage: string;
begin
  FUserAgent.GebruikerAanmelden(EditGebruikersnaam.Text, EditWachtwoord.Text, self.ApplicationContext.UserContext);

  if ApplicationContext.UserContext.IsOK then
  begin
    self.Navigator.NavigeerNaar(Main.NAVZOEKPRODUCTEN);
  end
  else
  begin
    // Login gefaald
    ErrorMessage := ApplicationContext.UserContext.ErrorMessage;
    if ApplicationContext.UserContext.InternalErrorMessage <> '' then
    begin
      ErrorMessage := ErrorMessage + sLineBreak + ApplicationContext.UserContext.InternalErrorMessage;
    end;

    if MessageDlg(ErrorMessage, TMsgDlgType.mtInformation, [mbRetry, mbCancel], 0, mbCancel) = mrRetry then
    begin
      // Retry gedrukt
      Login();
    end;
  end;
end;

end.