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#ifndef bmploader_hpp__
#define bmploader_hpp__

#include <cstdlib>
#include <cstdio>
using namespace std;

#include "FileIO.hpp"

class BMPClass
{
private:
    union
    {
        short int si[2];
        int i;
        char c[4];
    };
    int iHeight;
    int iWidth;
    int iSize;
    FileIO BMPFile;
public:
    class BMPException 
	{
    public:
        BMPException(const char *reason) : m_reason(reason) {}
        const char *reason() const { return m_reason; }
    private:
        const char *m_reason;
    };

    char *cpData;
    void LoadBMP(char *cpAddress);
	void SaveBMP(char *cpAddress);
    int Width() const { return iWidth; }
    int Height() const { return iHeight; }
	int Size() const { return iHeight*iWidth*3; }
	};

void BMPClass::LoadBMP(char *cpAddress)
{
    int iReadLoc;

    if (!BMPFile.OpenR(cpAddress))
        throw BMPException("No such file");

    BMPFile.Read(2,c,0);
    //Checks If file is BM
    if(si[0] != 19778)
        throw BMPException("File doesn't have BMP header");

    BMPFile.Read(4,c,30);
    if (i)
        throw BMPException("File is compressed");

    int bpp;
    BMPFile.Read(2,c,28);
    bpp = si[0];

    if (bpp!=24 && bpp!=32)
        throw BMPException("Unsupported bit depth");

    //Gets Width + Height
    BMPFile.Read(4,c,18);
    iWidth = i;
    BMPFile.Read(4,c,22);
    iHeight = i;
    //Gets Data starting location
    BMPFile.Read(4,c,10);
    iReadLoc = i;
    cpData = new char[iWidth*iHeight*3];

    for (int y = 0; y < iHeight; ++y)
	{
        for (int x = 0; x < iWidth; ++x)
		{
            BMPFile.Read(3,c,iReadLoc);

            // BMP's are stored bottom-up so invert y-coordinate
            int iIndex = 3 * ((iHeight - y - 1) * iWidth + x);
            cpData[iIndex] = c[0];
            cpData[iIndex+1] = c[1];
            cpData[iIndex+2] = c[2];

            if (bpp == 24)
                iReadLoc += 3;
            else
                iReadLoc += 4;
        }
    }

    BMPFile.Close();
}
void BMPClass::SaveBMP(char *cpAddress)
{
    if (!BMPFile.OpenW(cpAddress))
		throw BMPException("Acces Denied");
	//Writes all the BS before the file
	BMPFile.Write("BM",0,2);
	i = Size()+55;
	BMPFile.Write(c,2,4);
	i = 0;
	BMPFile.Write(c,6,4);
	i = 55;
	BMPFile.Write(c,10,4);
	i = 40;
	BMPFile.Write(c,14,4);
	i = Width();
	BMPFile.Write(c,18,4);
	i = Height();
	BMPFile.Write(c,22,4);
	si[0] = 1;
	si[1] = 8;
	BMPFile.Write(c,26,4);
	i=0;
	int iI = 0;
	while(iI < 6)
	{
		BMPFile.Write(c,30 + iI*4,4);
		iI++;
	}
	iI = 0;
	while(iI < Height()*Width())
	{
		c[0]=cpData[iI*3];
		c[1]=cpData[iI*3+1];
		c[2]=cpData[iI*3+2];
		c[3]=cpData[0];

		BMPFile.Write(c,54+iI*4,4);
		iI++;
	}
	
	BMPFile.Close();
}
#endif