awesome_game/Source/TurnBasedTutorial/MainMenu/SessionListWidget.cpp

// Fill out your copyright notice in the Description page of Project Settings.


#include "SessionListWidget.h"
#include "../SessionsGameInstanceSubsystem.h"
#include "Components/VerticalBox.h"
#include "SessionListEntryWidget.h"
#include "Components/Button.h"
#include "Kismet/GameplayStatics.h"

void USessionListWidget::NativeConstruct() {
    Super::NativeConstruct();

    RefreshListButton->OnClicked.AddDynamic(
        this, &ThisClass::OnRefreshListButtonClicked);
    ConnectToSelectedSessionButton->OnClicked.AddDynamic(
        this, &ThisClass::ConnectToFirstSession);

    const auto MyGameInstanceSubsystem = GetMyGameSubsystem();
    MyGameInstanceSubsystem->OnFindSessionsCompleteEvent.AddUObject(
        this, &ThisClass::RefreshList);
    MyGameInstanceSubsystem->OnJoinSessionCompleteEvent.AddUObject(
        this, &ThisClass::OnJoinSessionSuccess);

    // Ensure we have left any session
    GetMyGameSubsystem()->DestroySession();
    
    // Initiate search
    MyGameInstanceSubsystem->FindSessions(10, true);
}

void USessionListWidget::RefreshList(
    const TArray<FOnlineSessionSearchResult> &SessionResults,
    bool bSuccessful) {
    if (!bSuccessful) {
        UE_LOG(LogTemp, Error, TEXT("Find sessions FAILED!!!!"));
        // TODO: Mark find sessions error
        return;
    }
    SessionListBox->ClearChildren();
    for (const auto &Session : SessionResults) {
        auto *ItemWidget = CreateWidget<USessionListEntryWidget>(
            this, EntryClass);
        ItemWidget->Update(SessionListBox->GetChildrenCount(), Session);
        SessionListBox->AddChild(ItemWidget);
    }
}


void USessionListWidget::OnRefreshListButtonClicked() {
    // TODO: Show that we started searching...
    // Initiate search
    SessionListBox->ClearChildren();
    GetMyGameSubsystem()->FindSessions(10, true);
}

void USessionListWidget::ConnectToFirstSession() {
    GetMyGameSubsystem()->JoinSession(0);
}


void USessionListWidget::OnJoinSessionSuccess(
    EOnJoinSessionCompleteResult::Type Result) {
    if (Result != EOnJoinSessionCompleteResult::Success) {
        UE_LOG(LogTemp, Error, TEXT("Failed to connect to session!!"));
        return;
    }
    if (!GetMyGameSubsystem()->TryConnectToCurrentSession()) {
        UE_LOG(LogTemp, Error, TEXT("Failed to travel client to session!!"));
        return;
    }
    UE_LOG(LogTemp, Display, TEXT("Connected and travelled to session!!!"));
}


USessionsGameInstanceSubsystem *
USessionListWidget::GetMyGameSubsystem() const {
    const UGameInstance *GameInstance = UGameplayStatics::GetGameInstance(
        GetWorld());
    USessionsGameInstanceSubsystem *GameInstanceSubsystem = GameInstance->
        GetSubsystem<USessionsGameInstanceSubsystem>();
    return GameInstanceSubsystem;
}