====== Extension-Arhitektura ======

Detaljan opis interne arhitekture WvdS VSCode Extensiona.

===== Životni ciklus =====

<code>
┌─────────────────────────────────────────────────────────────┐
│                    EXTENSION LIFECYCLE                       │
├─────────────────────────────────────────────────────────────┤
│                                                              │
│  1. VS Code Start                                            │
│     ↓                                                        │
│  2. Activation Event se aktivira                             │
│     (onCommand, onLanguage, onStartupFinished, ...)          │
│     ↓                                                        │
│  3. extension_main.js se učitava                             │
│     ↓                                                        │
│  4. Activate() se poziva                                     │
│     → Inicijalizacija servisa                                │
│     → Registracija naredbi                                   │
│     → Postavljanje Event Handlera                            │
│     ↓                                                        │
│  5. Extension je aktivan                                     │
│     → Interakcija s korisnikom                               │
│     → Izvršavanje naredbi                                    │
│     ↓                                                        │
│  6. VS Code Shutdown / Extension deaktiviran                 │
│     ↓                                                        │
│  7. Deactivate() se poziva                                   │
│     → Cleanup                                                │
│     → Oslobađanje resursa                                    │
│                                                              │
└─────────────────────────────────────────────────────────────┘
</code>

===== Entry Point =====

Svaki Extension ima točno jedan Entry Point: ''extension_main.pas''

<code pascal>
unit extension_main;

{$mode objfpc}{$H+}

interface

uses
  JS, VSCode.API, VSCode.ExtensionExports;

procedure Activate(AContext: TExtensionContext);
procedure Deactivate;

implementation

procedure Activate(AContext: TExtensionContext);
begin
  // Inicijalizacija ovdje
end;

procedure Deactivate;
begin
  // Cleanup ovdje
end;

initialization
  ExportActivateDeactivate(@Activate, @Deactivate);

end.
</code>

===== Activation Events =====

^ Event ^ Opis ^ Primjer ^
| onStartupFinished | Nakon pokretanja VS Code | Core Extension |
| onCommand:* | Pri pozivu naredbe | wvds.build.run |
| onLanguage:* | Pri otvaranju datoteke | pascal, pxaml |
| onView:* | Pri otvaranju Viewa | wvds.toolbox |
| workspaceContains:** | Kada datoteka postoji | *.lpr, *.pas |
| onCustomEditor:* | Pri Custom Editoru | wvds.designer |

===== Registracija naredbi =====

<code pascal>
procedure RegisterCommands(AContext: TExtensionContext);
begin
  // Jednostavna naredba
  RegisterCommand('wvds.feature.action', @HandleAction);

  // Naredba s argumentima
  RegisterCommand('wvds.feature.open', @HandleOpen);

  // Asinkrona naredba
  RegisterAsyncCommand('wvds.feature.process', @HandleProcessAsync);
end;

procedure HandleAction(Args: TJSValueDynArray);
begin
  ShowInfoMessage('Akcija izvršena');
end;

function HandleProcessAsync(Args: TJSValueDynArray): TJSPromise;
begin
  Result := TJSPromise.New(
    procedure(Resolve, Reject: TJSPromiseResolver)
    begin
      // Async posao...
      Resolve(nil);
    end
  );
end;
</code>

===== Service-Pattern =====

<code pascal>
// Feature.Service.pas
unit Feature.Service;

interface

type
  TWvdSFeatureService = class
  private
    FInitialized: Boolean;
  public
    procedure Initialize;
    procedure Shutdown;
    function DoWork(const AInput: string): string;
  end;

var
  FeatureService: TWvdSFeatureService;

implementation

procedure TWvdSFeatureService.Initialize;
begin
  if FInitialized then Exit;
  // Inicijalizacija servisa
  FInitialized := True;
end;

procedure TWvdSFeatureService.Shutdown;
begin
  if not FInitialized then Exit;
  // Čišćenje
  FInitialized := False;
end;

initialization
  FeatureService := TWvdSFeatureService.Create;

finalization
  FeatureService.Free;

end.
</code>

===== Disposables =====

VS Code koristi Disposables za upravljanje resursima:

<code pascal>
procedure Activate(AContext: TExtensionContext);
var
  Disposable: TDisposable;
begin
  // Registracija naredbe i dobivanje Disposablea
  Disposable := RegisterCommand('wvds.test', @Handler);

  // Dodavanje u Context za automatski cleanup
  AContext.Subscriptions.Push(Disposable);
end;
</code>

===== WebView-Integracija =====

<code pascal>
procedure ShowWebViewPanel;
var
  Panel: TWebviewPanel;
begin
  Panel := CreateWebviewPanel(
    'wvds.feature.panel',     // viewType
    'Feature Panel',           // title
    ViewColumn.One,           // showOptions
    WebviewOptions            // options
  );

  // Postavljanje HTML-a
  Panel.Webview.Html := GetPanelHtml;

  // Postavljanje Messaginga
  Panel.Webview.OnDidReceiveMessage(@HandleWebviewMessage);

  // Slanje poruka
  Panel.Webview.PostMessage(TJSObject.New);
end;
</code>

===== Event-Handling =====

<code pascal>
procedure SetupEventHandlers;
begin
  // Promjena konfiguracije
  OnDidChangeConfiguration(@HandleConfigChange);

  // Dokument-Eventi
  OnDidOpenTextDocument(@HandleDocumentOpen);
  OnDidSaveTextDocument(@HandleDocumentSave);
  OnDidCloseTextDocument(@HandleDocumentClose);

  // Workspace-Eventi
  OnDidChangeWorkspaceFolders(@HandleWorkspaceChange);
end;
</code>

===== Vidi također =====

  * [[.:architektur|Pregled arhitekture]]
  * [[.:extension-entwicklung|Razvoj Extensiona]]
  * [[.:vscode-wrapper|VSCode Wrapper API]]