#ifndef LIGHTKEEPER_FIRSTPERSONCONTROLLER_H
#define LIGHTKEEPER_FIRSTPERSONCONTROLLER_H

#include <glm/glm.hpp>
#include <destrum/Input/InputManager.h>
#include <destrum/ObjectModel/Component.h>

class Rigidbody;
class CapsuleCollider;

// Dynamic capsule character. Velocity is driven directly (no forces) so movement stays responsive:
// acceleration towards the wished velocity, own gravity, coyote time and jump buffering.
class FirstPersonController final : public Component {
public:
    explicit FirstPersonController(GameObject& parent);

    std::string GetTypeName() const override { return "FirstPersonController"; }

    void Start() override;
    void Update(float dt) override;
    void FixedUpdate(float fixedDt) override;
    void ImGuiInspector() override;
    nlohmann::json Serialize() const override;
    void Deserialize(const nlohmann::json& data) override;

    [[nodiscard]] float GetYaw() const { return m_Yaw; }
    void SetYaw(float yawRadians) { m_Yaw = yawRadians; }
    [[nodiscard]] float GetPitch() const { return m_Pitch; }
    [[nodiscard]] float GetEyeHeight() const { return m_EyeHeight; }

    // Eye position interpolated between the last two physics steps, so the camera moves smoothly at any framerate
    [[nodiscard]] glm::vec3 GetEyePosition() const;

    void SetMovementSpeed(float speed) { m_WalkSpeed = speed; }
    [[nodiscard]] float GetMovementSpeed() const { return m_WalkSpeed; }

    void SetMouseSensitivity(float sens) { m_MouseSensitivity = sens; }
    [[nodiscard]] float GetMouseSensitivity() const { return m_MouseSensitivity; }

    [[nodiscard]] bool IsGrounded() const { return m_Grounded; }

    [[nodiscard]] bool IsMouseCaptured() const { return InputManager::GetInstance().IsMouseCaptured(); }
    void SetMouseCaptured(bool captured);

private:
    [[nodiscard]] bool CheckGrounded() const;
    [[nodiscard]] glm::vec3 GetWishDirection() const;

    Rigidbody* m_Rigidbody{nullptr};
    CapsuleCollider* m_Capsule{nullptr};

    float m_Yaw{0.0f};
    float m_Pitch{0.0f};
    float m_MouseSensitivity{0.002f};
    float m_EyeHeight{0.7f}; // above the capsule center

    float m_WalkSpeed{5.0f};
    float m_SprintSpeed{8.5f};
    float m_GroundAcceleration{60.0f};
    float m_AirAcceleration{15.0f};
    float m_JumpHeight{1.3f};
    float m_Gravity{22.0f};
    float m_FallGravityMultiplier{1.6f};
    float m_CoyoteTime{0.1f};
    float m_JumpBufferTime{0.12f};

    bool m_Grounded{false};
    bool m_JumpHeld{false};
    float m_CoyoteTimer{0.0f};
    float m_JumpBufferTimer{0.0f};

    glm::vec3 m_PreviousPosition{0.0f};
    bool m_HasPreviousPosition{false};
};

#endif