#pragma once

#include "CoreMinimal.h"
#include "GameFramework/Actor.h"
#include "Containers/Map.h"
#include "HexVector.h"
#include "AdventureMap.generated.h"

class AHexTile;
class AStarFog;
class AMapObject;
class AAdventurePlayerController;

UCLASS()
class FRAY_API AAdventureMap : public AActor
{
	GENERATED_BODY()
	
public:	
	// Sets default values for this actor's properties
	AAdventureMap();

	UPROPERTY()
		UWorld* World;
	UPROPERTY(EditDefaultsOnly, BlueprintReadOnly, Category = "Config")
		TSubclassOf<AHexTile> BaseTileClass;
	UPROPERTY(EditDefaultsOnly, BlueprintReadOnly, Category = "Config")
		TSubclassOf<AStarFog> BaseFogClass;
	UPROPERTY(EditDefaultsOnly, BlueprintReadOnly, Category = "Config")
		int32 GridSize = 60;
	UPROPERTY(EditDefaultsOnly, BlueprintReadOnly, Category = "Config")
		int32 TileSize = 100;

	UPROPERTY(VisibleAnywhere, BlueprintReadWrite)
		AAdventurePlayerController* PCRef;

	UFUNCTION(BlueprintCallable, Category = "Generation")
		void MakeGrid();
	UPROPERTY(BlueprintReadOnly, Category = "Generation")
		bool bHexGridReady;
	UPROPERTY(BlueprintReadOnly, Category = "Generation")
		TArray<AHexTile*> Grid;

	UFUNCTION(BlueprintCallable, Category = "Utility")
		int32 GridIndex(int32 q, int32 r);
	UFUNCTION(BlueprintCallable, Category = "Utility")
		AHexTile* RandomHex();

	// Cardinal direction vectors
	UPROPERTY(BlueprintReadOnly, VisibleAnywhere)	//diag
	FHexVector N	= FHexVector(1, -2);			//
	UPROPERTY(BlueprintReadOnly, VisibleAnywhere)
	FHexVector NNE	= FHexVector(1, -1);
	UPROPERTY(BlueprintReadOnly, VisibleAnywhere)	//diag
	FHexVector ENE	= FHexVector(2, -1);			//
	UPROPERTY(BlueprintReadOnly, VisibleAnywhere)
	FHexVector E	= FHexVector(1, 0);
	UPROPERTY(BlueprintReadOnly, VisibleAnywhere)	//diag
	FHexVector ESE	= FHexVector(1, 1);				//
	UPROPERTY(BlueprintReadOnly, VisibleAnywhere)
	FHexVector SSE	= FHexVector(0, 1);
	UPROPERTY(BlueprintReadOnly, VisibleAnywhere)	//diag
	FHexVector S	= FHexVector(-1, 2);			//
	UPROPERTY(BlueprintReadOnly, VisibleAnywhere)
	FHexVector SSW	= FHexVector(-1, 1);
	UPROPERTY(BlueprintReadOnly, VisibleAnywhere)	//diag
	FHexVector WSW	= FHexVector(-2, 1);			//
	UPROPERTY(BlueprintReadOnly, VisibleAnywhere)
	FHexVector W	= FHexVector(-1, 0);
	UPROPERTY(BlueprintReadOnly, VisibleAnywhere)	//diag
	FHexVector WNW	= FHexVector(-1, -1);			//
	UPROPERTY(BlueprintReadOnly, VisibleAnywhere)
	FHexVector NNW	= FHexVector(0, -1);
	UPROPERTY(BlueprintReadOnly, VisibleAnywhere)
		TArray<FHexVector> UnitVectors;
	UPROPERTY(BlueprintReadOnly, VisibleAnywhere)
		TArray<FHexVector> DiagonalUnitVectors;
	UFUNCTION(BlueprintCallable, Category = "Utility")
		FHexVector UnitDiagFromUnitNB(FHexVector InVecA, FHexVector InVecB);
	UFUNCTION(BlueprintCallable, Category = "Utility")
		bool DiagIsReachable(AHexTile* InStart, FHexVector InDiagUnitVec);

	UFUNCTION(BlueprintCallable, Category = "Utility")
		float LerpAxial(int32 a, int32 b, int32 t);
	UFUNCTION(BlueprintCallable, Category = "Utility")
		FHexVector AxialRound(float q, float r)

	UFUNCTION(BlueprintCallable, Category = "Utility")
		TArray<AHexTile*> Neighbors(AHexTile* OfHex, bool bFreeOnly);
	UFUNCTION(BlueprintCallable, Category = "Utility")
		TArray<AHexTile*> FreeDiagonals(AHexTile* OfHex);
	UFUNCTION(BlueprintCallable, Category = "Utility")
		TSet<AHexTile*> BreadthFirstSearch(AHexTile* Start, int32 Radius);
	UFUNCTION(BlueprintCallable, Category = "Runtime")
		TArray<AHexTile*> FindPathAStar(AHexTile* Start, AHexTile* Goal, bool bDiags);
	UFUNCTION(BlueprintCallable, Category = "Runtime")
		TArray<AHexTile*> ShortcutAStar(TArray<AHexTile*> Path);


// considering a MapObjectManager class or moving pathfinding & search to PlayerController

	UPROPERTY(BlueprintReadWrite, EditAnywhere)
		TMap<AHexTile*, AMapObject*> MapObjects;
	UPROPERTY(BlueprintReadOnly)
		TMap<int32, AMapObject*> MapObjectsByID;
	UPROPERTY(BlueprintReadWrite, VisibleAnywhere)
		int32 IncID = -1;


protected:
	// Called when the game starts or when spawned
	virtual void BeginPlay() override;
};


// only used for an experimental implementation of A*
template <typename InElementType>
struct TPriorityQueueNode {
    InElementType Element;
    float Priority;

    TPriorityQueueNode()
    {
    }

    TPriorityQueueNode(InElementType InElement, float InPriority)
    {
        Element = InElement;
        Priority = InPriority;
    }

    bool operator<(const TPriorityQueueNode<InElementType> Other) const
    {
        return Priority < Other.Priority;
    }
};
template <typename InElementType>
class TPriorityQueue {
public:
    TPriorityQueue()
    {
        Array.Heapify();
    }

public:
    // Always check if IsEmpty() before Pop-ing!
    InElementType Pop()
    {
        TPriorityQueueNode<InElementType> Node;
        Array.HeapPop(Node);
        return Node.Element;
    }

    TPriorityQueueNode<InElementType> PopNode()
    {
        TPriorityQueueNode<InElementType> Node;
        Array.HeapPop(Node);
        return Node;
    }

    void Push(InElementType Element, float Priority)
    {
        Array.HeapPush(TPriorityQueueNode<InElementType>(Element, Priority));
    }

    bool IsEmpty() const
    {
        return Array.Num() == 0;
    }

public: // make private later on
    TArray<TPriorityQueueNode<InElementType>> Array;
};