MechDefence/Public/MConstructableBuilding.h

#pragma once

#include "CoreMinimal.h"
#include "MGameplayActor.h"
#include "MConstructableBuilding.generated.h"

class UArrowComponent;
class UMHealthComponent;
class UWidgetComponent;
class AMConstructableBuilding;

UENUM(BlueprintType)
enum class EBuildingState : uint8
{
	Constructable      UMETA(DisplayName = "Constructable"),
	UnConstructable    UMETA(DisplayName = "UnConstructable"),
	UnderConstruction  UMETA(DisplayName = "UnderConstruction"),
	Constructed        UMETA(DisplayName = "Constructed")
};

DECLARE_DYNAMIC_MULTICAST_DELEGATE_ThreeParams(FOnBuildingStateChanged, AMConstructableBuilding*, Building, EBuildingState, NewState, EBuildingState, PreviousState);

UCLASS()
class MECHDEFENCE_API AMConstructableBuilding : public AMGameplayActor
{
	GENERATED_BODY()
	
public:	
	AMConstructableBuilding();
	
protected:

	UPROPERTY(EditDefaultsOnly, BlueprintReadOnly)
	USkeletalMeshComponent* BaseBuildingMesh;

	UPROPERTY(EditDefaultsOnly, BlueprintReadOnly, Category = "Building", meta = (Tooltip = "The colour that will be used to show the building when it is at a valid location and can be constructed"))
	FLinearColor ConstructableColor;
	
	UPROPERTY(EditDefaultsOnly, BlueprintReadOnly, Category = "Building", meta = (Tooltip = "The colour that will be used to show the building when it is at a location where it cannot be constructed"))
	FLinearColor UnConstructableColor;

	UPROPERTY(EditDefaultsOnly, BlueprintReadOnly, Category = "Building", meta = (Tooltip = "The colour that will be used to show the building when it has been placed in the world and is under construction"))
	FLinearColor UnderConstructionColor;

	UPROPERTY(EditDefaultsOnly, BlueprintReadOnly, Category = "Building", meta = (Tooltip = "The material that will be used on all the meshes of this building while it is in an unconstructed state."))
	UMaterialInterface* BuildingDynamicStateMaterial;

	UPROPERTY(EditDefaultsOnly, BlueprintReadOnly, Category = "Building")
	EBuildingState BuildingState;

	UPROPERTY(BlueprintReadWrite)
	TArray<UMaterialInterface*> DefaultMaterials;

	UPROPERTY(VisibleDefaultsOnly, BlueprintReadOnly, Category = "Building", meta = (Tooltip = "Dynamically created material that represents the current state of the building"))
	UMaterialInstanceDynamic* CurrentBuildingStateMaterial;

	UPROPERTY(EditDefaultsOnly, BlueprintReadOnly, Category = "Building", meta = (Tooltip = "List of actor types that will be checked against to determine if the building can be placed at a particular location"))
	TArray<TSubclassOf<AActor>> InvalidActorsFilter;

	UPROPERTY(EditDefaultsOnly, BlueprintReadOnly, Category = "Building", meta = (Tooltip = "List of actor types that required to be overlapping with this building at a particular location if it is to be placed there"))
	TArray<TSubclassOf<AActor>> RequiredOverlappingActorsFilter;

	UPROPERTY(EditDefaultsOnly, BlueprintReadOnly, Category = "Building", meta = (Tooltip = "This shape is used alongside InvalidActors filter to determine whether the building can be placed at its current location or not"))
	UShapeComponent* PlacementOverlapChecker;

	UPROPERTY(EditDefaultsOnly, BlueprintReadOnly, Category = "Building")
	UWidgetComponent* StatusIndicatorWidget;

	UPROPERTY(EditDefaultsOnly, BlueprintReadOnly, Category = "Building")
	UStaticMeshComponent* ArrowMesh;

	UPROPERTY(EditDefaultsOnly, BlueprintReadOnly, Category = "Building")
	UMHealthComponent* HealthComponent;
	
	UFUNCTION()
	void HandleMeshComponentEndOverlap(UPrimitiveComponent* OverlappedComponent, AActor* OtherActor, UPrimitiveComponent* OtherComp, int32 OtherBodyIndex);

	UFUNCTION()
	void HandleMeshComponentBeginOverlap(UPrimitiveComponent* OverlappedComponent, AActor* OtherActor, UPrimitiveComponent* OtherComp, int32 OtherBodyIndex, bool bFromSweep, const FHitResult& SweepResult);

	UFUNCTION()
	void SetupHealthIndicator();

	virtual void BeginPlay() override;

	UFUNCTION()
	void ConstructionCompleted();

	FTimerHandle TimerHandle_UnderConstructionTimer;

	
public:	
	virtual void Tick(float DeltaTime) override;

	UFUNCTION(BlueprintCallable)
	void SetBuildingState(TEnumAsByte<EBuildingState> NewState);

	UFUNCTION(BlueprintImplementableEvent, meta = (Tooltip = "When building state is set, the base class only changes the state of the  default mesh. Implement this function in blueprint to add other behaviour"))
	void BuildingStateSet(const EBuildingState& NewState, const EBuildingState& PreviousState);

	UFUNCTION(BlueprintCallable)
	void StartBuildingConstruction(float TimeToConstruct);

	UFUNCTION(BlueprintCallable, BlueprintNativeEvent)
	bool IsAtValidLocation();

	UFUNCTION(BlueprintCallable)
	EBuildingState GetBuildingState() const { return BuildingState; };

	UFUNCTION(BlueprintCallable, BlueprintNativeEvent)
	void SetHighlighted(bool Highlighted);

	UPROPERTY(EditDefaultsOnly, BlueprintReadOnly, Category = "Events")
	FOnBuildingStateChanged OnBuildingStateChanged;
};