#pragma once
#include <cmath>
#include <cstring>
#include <fstream>
#include <glm/gtc/constants.hpp>
#include <iostream>
#include <string>

#define BMP_BYTE_CODE 0x4D42

#pragma pack(push, 1)
struct BMPFILEHEADER {
    uint16_t bfType;
    uint32_t bfSize;
    uint32_t bfReserved;
    uint32_t bfOffBits;
};

struct BMPINFOHEADER {
    uint32_t biSize;
    uint32_t biWidth;
    uint32_t biHeight;
    uint16_t biPlanes;
    uint16_t biBitCount;
    uint32_t biCompression;
    uint32_t biSizeImage;
    int32_t biXPelsPerMeter;
    int32_t biYPelsPerMeter;
    uint32_t biClrUsed;
    uint32_t biClrImportant;
};
#pragma pack(pop)

/**
 * @class BMP
 * @brief  BMP file data and helper functions
 *
 * @author Michael John
 * @version 01.00
 * @date 25/08/2021
 *
 * @todo
 *
 * @bug
 */

class BMP {
   public:
    BMP() = default;
    ~BMP();

    /** @brief Copy Constructor
     *
     * @param other BMP to copy from to this
     */
    BMP(const BMP& other);

    /** @brief Assignment operator
     *
     * @param other BMP to copy from to this
     */
    BMP& operator=(const BMP&);

    /** @brief Reads in a BMP image of the string fileName
     *
     * @param fileName fileName of BMP including extension
     * @return true if successfully read in
     */
    bool readInBMP(const std::string& fileName);

    /** @brief gets the BMP file format Header struct of a read in BMP file
     *
     * @return the BMP file header struct
     */
    BMPFILEHEADER* getFileHeader() const;

    /** @brief gets the BMP file information Header struct of a read in BMP file
     *
     * @return the BMP information header struct
     */
    BMPINFOHEADER* getInfoHeader() const;

    /** @brief Returns a pointer to the BMP's image pixels
     *
     * @return  pointer to the image pixels
     */
    unsigned char* getPixels();

    /** @brief Rotates a BMP image to orientation defined by degrees parameter
     *
     * @param degrees - rotation angle
     */
    void rotateBMP(double degrees);

   protected:
   private:
    BMPFILEHEADER* m_fileHeader{nullptr};  /// BMP format file header pointer
    BMPINFOHEADER* m_infoHeader{
        nullptr};  /// BMP format info header pointer - image variables
    unsigned char* m_pixels{nullptr};  /// pointer to BMP image pixels
    std::size_t m_pixelsSize{0};       /// size of m_pixels
    void Clear();                      /// deletes and clears pointer data

    /** @brief Copy helper method
     * Copies heap memory from other BMP to this
     * @return true on successful copy
     */
    bool copy(const BMP& other);
};