#pragma once

#include "CoreMinimal.h"
#include "GameFramework/PlayerController.h"
#include "MotionCaptureInterface.h"
#include "PlanetPlayerController.generated.h"

class AInteractiveObjectBase;
class UGlobeInteractionComponent;

DECLARE_DYNAMIC_MULTICAST_DELEGATE_OneParam(FOnObjectSelected, AInteractiveObjectBase*, Object);
DECLARE_DYNAMIC_MULTICAST_DELEGATE(FOnObjectDeselected);

/**
 * APlanetPlayerController
 *
 * 统一处理两路输入：
 *   1. 鼠标/键盘（始终可用，调试和演示备用）
 *   2. 动捕手势（TODO: 供应商协议确认后接入）
 *
 * 鼠标操作：
 *   左键拖拽   → 旋转地球
 *   滚轮       → 缩放
 *   悬停       → 高亮物件
 *   左键单击   → 选中物件 / 取消选中
 *   ESC        → 取消选中
 */
UCLASS(BlueprintType, Blueprintable)
class PLANETCLIENT_API APlanetPlayerController : public APlayerController
{
    GENERATED_BODY()

public:
    APlanetPlayerController();

    // -----------------------------------------------------------------------
    // 组件
    // -----------------------------------------------------------------------
    UPROPERTY(VisibleAnywhere, BlueprintReadOnly, Category="Planet|Components")
    UGlobeInteractionComponent* GlobeInteraction;

    // -----------------------------------------------------------------------
    // 动捕配置（TODO: 供应商回复后配置）
    // -----------------------------------------------------------------------
    UPROPERTY(EditAnywhere, BlueprintReadWrite, Category="Planet|MotionCapture")
    FMotionActionMapping MotionActionMapping;

    // 动捕接收器实例（TODO: 确认协议后指向具体子类实例）
    UPROPERTY(EditAnywhere, BlueprintReadWrite, Category="Planet|MotionCapture")
    UMotionCaptureReceiver* MotionCaptureReceiver = nullptr;

    // -----------------------------------------------------------------------
    // 鼠标灵敏度
    // -----------------------------------------------------------------------
    UPROPERTY(EditAnywhere, BlueprintReadWrite, Category="Planet|Input")
    float MouseDragSensitivity = 0.3f;

    // 判定为"拖拽"而非"点击"的最小移动距离（像素）
    UPROPERTY(EditAnywhere, BlueprintReadWrite, Category="Planet|Input")
    float DragThresholdPixels = 5.f;

    // -----------------------------------------------------------------------
    // 事件
    // -----------------------------------------------------------------------
    UPROPERTY(BlueprintAssignable, Category="Planet|Events")
    FOnObjectSelected OnObjectSelected;

    UPROPERTY(BlueprintAssignable, Category="Planet|Events")
    FOnObjectDeselected OnObjectDeselected;

    // -----------------------------------------------------------------------
    // 公开 API
    // -----------------------------------------------------------------------
    UFUNCTION(BlueprintCallable, Category="Planet")
    void DeselectCurrent();

    UFUNCTION(BlueprintPure, Category="Planet")
    AInteractiveObjectBase* GetSelectedObject() const { return SelectedObject; }

protected:
    virtual void BeginPlay() override;
    virtual void Tick(float DeltaTime) override;
    virtual void SetupInputComponent() override;

private:
    // 鼠标拖拽状态
    bool bLeftMouseDown = false;
    bool bIsDragging    = false;
    FVector2D MouseDownPosition = FVector2D::ZeroVector;

    // 交互状态
    AInteractiveObjectBase* SelectedObject = nullptr;
    AInteractiveObjectBase* HoveredObject  = nullptr;

    // 输入回调
    void OnLeftMouseDown();
    void OnLeftMouseUp();
    void OnMouseX(float Value);
    void OnMouseY(float Value);
    void OnZoom(float Value);
    void OnEscape();

    // 悬停检测
    void UpdateHover();

    // 射线检测
    AInteractiveObjectBase* GetObjectUnderCursor() const;

    // 动捕事件绑定（TODO: 供应商回复后在 BeginPlay 里绑定接收器）
    UFUNCTION()
    void OnMotionGesture(EMotionGesture Gesture);
    UFUNCTION()
    void OnMotionRotate(float DeltaYaw, float DeltaPitch);
    UFUNCTION()
    void OnMotionZoom(float DeltaScale);
    void BindMotionCaptureEvents();
};