#pragma once

#include "Shader.h"

#include <glad/glad.h>
#include <glm/glm.hpp>

// Movement keys/buttons
enum Camera_Movement {
    FORWARD,
    BACKWARD,
    LEFT,
    RIGHT,
    SPRINT
};

// Default camera values
const float YAW         = -90.0f;
const float PITCH       =  0.0f;
const float SPEED       =  5.5f;
const float SENSITIVITY =  0.1f;
const float ZOOM        =  45.0f;

class Camera
{
public:
    glm::vec3 position, front, up, right, worldUp;
    float yaw, pitch;
    float movementSpeed, mouseSensitivity, zoom;
    bool sprinting = false;

    // constructor with vectors
    Camera(glm::vec3 newPosition = glm::vec3(0.0f, 0.0f, 0.0f), glm::vec3 up = glm::vec3(0.0f, 1.0f, 0.0f), float newYaw = YAW, float newPitch = PITCH);    // constructor with scalar values
    Camera(float posX, float posY, float posZ, float upX, float upY, float upZ, float newYaw, float newPitch);
    // returns the view matrix calculated using Euler Angles and the LookAt Matrix
    glm::mat4 GetViewMatrix();
    // processes input received from any keyboard-like input system. Accepts input parameter in the form of camera defined ENUM (to abstract it from windowing systems)
    void processKeyboard(Camera_Movement direction, float deltaTime);
    // processes input received from a mouse input system. Expects the offset value in both the x and y direction.
    void processMouseMovement(float xoffset, float yoffset, GLboolean constrainPitch = true);

    // processes input received from a mouse scroll-wheel event. Only requires input on the vertical wheel-axis
    void processMouseScroll(float yoffset);
    void Update(Shader shader, int screenWidth, int screenHeight);

private:
    // calculates the front vector from the Camera's (updated) Euler Angles
    void updateCameraVectors();
};