#pragma once

#include "CoreMinimal.h"
#include "Components/ActorComponent.h"
#include "SkillTreeTypes.h"
#include "SkillTreeComponent.generated.h"

DECLARE_DYNAMIC_MULTICAST_DELEGATE_OneParam(FOnSkillPointsChanged, int32, NewSkillPoints);
DECLARE_DYNAMIC_MULTICAST_DELEGATE_OneParam(FOnSkillPurchased, FName, SkillID);
DECLARE_DYNAMIC_MULTICAST_DELEGATE_OneParam(FOnSkillSelectionChanged, int32, TotalCost);
DECLARE_DYNAMIC_MULTICAST_DELEGATE_OneParam(FOnSkillStateChanged, FName, SkillID);
DECLARE_DYNAMIC_MULTICAST_DELEGATE_TwoParams(FOnSelectionError, FName, SkillID, FText, ErrorMessage);

UCLASS(ClassGroup=(Custom), meta=(BlueprintSpawnableComponent))
class UTAD_UI_API USkillTreeComponent : public UActorComponent
{
    GENERATED_BODY()

public:
    USkillTreeComponent();

protected:
    virtual void BeginPlay() override;

    // Current skill points available
    UPROPERTY(EditAnywhere, BlueprintReadOnly, Category = "Skill Points", SaveGame)
    int32 AvailableSkillPoints = 0;
    // Total skill points earned
    UPROPERTY(BlueprintReadOnly, Category = "Skill Points", SaveGame)
    int32 TotalSkillPointsEarned = 0;

    // Data table containing all skill definitions
    UPROPERTY(EditDefaultsOnly, BlueprintReadOnly, Category = "Skill Tree")
    class UDataTable* SkillDataTable = nullptr;

    // All skills loaded from the data table
    UPROPERTY(BlueprintReadOnly, Category = "Skill Tree")
    TMap<FName, FSkillNodeRuntime> AllSkills = {};

    // Currently purchased skills
    UPROPERTY(BlueprintReadOnly, Category = "Skill Tree", SaveGame)
    TArray<FName> PurchasedSkills;

    // Currently selected skills for purchase
    UPROPERTY(BlueprintReadOnly, Category = "Skill Tree")
    TArray<FName> SelectedSkills;

    // Cache the total cost of selected skills
    UPROPERTY(BlueprintReadOnly, Category = "Skill Tree")
    int32 CurrentSelectionCost;

public:
    // Initialize the skill tree from data table
    UFUNCTION(BlueprintCallable, Category = "Skill Tree")
    void InitializeSkillTree();

    // Skill Points Management
    UFUNCTION(BlueprintCallable, Category = "Skill Points")
    void AddSkillPoints(int32 Amount);

    UFUNCTION(BlueprintCallable, Category = "Skill Points")
    void RemoveSkillPoints(int32 Amount);

    UFUNCTION(BlueprintPure, Category = "Skill Points")
    int32 GetAvailableSkillPoints() const { return AvailableSkillPoints; }

    UFUNCTION(BlueprintPure, Category = "Skill Points")
    int32 GetTotalSkillPointsEarned() const { return TotalSkillPointsEarned; }

    // Selection Management
    UFUNCTION(BlueprintCallable, Category = "Skill Selection")
    bool SelectSkill(FName SkillID);

    UFUNCTION(BlueprintCallable, Category = "Skill Selection")
    bool DeselectSkill(FName SkillID);

    UFUNCTION(BlueprintCallable, Category = "Skill Selection")
    void ClearSelection();

    UFUNCTION(BlueprintCallable, Category = "Skill Selection")
    bool ConfirmPurchase();

    UFUNCTION(BlueprintPure, Category = "Skill Selection")
    TArray<FName> GetSelectedSkills() const { return SelectedSkills; }

    UFUNCTION(BlueprintPure, Category = "Skill Selection")
    int32 GetSelectionCost() const { return CurrentSelectionCost; }

    UFUNCTION(BlueprintPure, Category = "Skill Selection")
    bool CanAffordSelection() const { return AvailableSkillPoints >= CurrentSelectionCost; }

    // Skill State Queries
    UFUNCTION(BlueprintPure, Category = "Skill State")
    bool IsSkillPurchased(FName SkillID) const;
    UFUNCTION(BlueprintPure, Category = "Skill State")
    bool IsSkillSelected(FName SkillID) const;
    UFUNCTION(BlueprintPure, Category = "Skill State")
    bool IsSkillAvailable(FName SkillID) const;

    UFUNCTION(BlueprintPure, Category = "Skill State")
    bool CanSelectSkill(FName SkillID, FText& OutErrorMessage) const;

    UFUNCTION(BlueprintPure, Category = "Skill State")
    ESkillNodeState GetSkillState(FName SkillID) const;

    // Get skill data
    UFUNCTION(BlueprintPure, Category = "Skill Data")
    bool GetSkillNodeData(FName SkillID, FSkillNodeRuntime& OutNodeData) const;

    UFUNCTION(BlueprintPure, Category = "Skill Data")
    TArray<FSkillNodeRuntime> GetAllSkillNodes() const;

    // Calculate total bonuses from purchased skills
    UFUNCTION(BlueprintPure, Category = "Skill Bonuses")
    float GetTotalHealthBonus() const;
    UFUNCTION(BlueprintPure, Category = "Skill Bonuses")
    float GetTotalDamageBonus() const;
    UFUNCTION(BlueprintPure, Category = "Skill Bonuses")
    float GetTotalSpeedBonus() const;
	
    UFUNCTION(BlueprintPure, Category = "Skill Bonuses")
    float GetTotalHealthBonusPercent() const;
    UFUNCTION(BlueprintPure, Category = "Skill Bonuses")
    float GetTotalDamageBonusPercent() const;
    UFUNCTION(BlueprintPure, Category = "Skill Bonuses")
    float GetTotalSpeedBonusPercent() const;

    // Reset skills (for respec feature)
    UFUNCTION(BlueprintCallable, Category = "Skill Tree")
    void ResetAllSkills();

    // Events
    UPROPERTY(BlueprintAssignable, Category = "Skill Events")
    FOnSkillPointsChanged OnSkillPointsChanged;
    UPROPERTY(BlueprintAssignable, Category = "Skill Events")
    FOnSkillPurchased OnSkillPurchased;
    UPROPERTY(BlueprintAssignable, Category = "Skill Events")
    FOnSkillSelectionChanged OnSkillSelectionChanged;
    UPROPERTY(BlueprintAssignable, Category = "Skill Events")
    FOnSkillStateChanged OnSkillStateChanged;
    UPROPERTY(BlueprintAssignable, Category = "Skill Events")
    FOnSelectionError OnSelectionError;

private:
    // Internal helper functions
    void UpdateSkillStates();
    void UpdateSelectionCost();
    bool ArePrerequisitesMet(const FSkillNodeData& SkillData, bool bIncludeSelected = false) const;
    bool HasChildrenPurchased(FName SkillID) const;
    void ApplySkillEffects(const FSkillNodeData& SkillData);
    void RemoveSkillEffects(const FSkillNodeData& SkillData);
    void CascadeDeselectDependents(FName SkillID);
};