#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "imageInput.h"

#define BUFFER_SIZE 100
#define FILE_HEADER_STRING "__info2_image_file_format__"

// TODO Implementieren Sie geeignete Hilfsfunktionen für das Lesen der Bildserie aus einer Datei
GrayScaleImage *readSingleImage(size_t widht, size_t height) {
    
}


// TODO Vervollständigen Sie die Funktion readImages unter Benutzung Ihrer Hilfsfunktionen
GrayScaleImageSeries *readImages(const char *path)
{
    GrayScaleImageSeries *series = NULL;
    unsigned short NumberOfImages;
    unsigned short PictureWidth;
    unsigned short PictureHeight;
    char* verifyWord;
    size_t bufferCount = 0;
    
    FILE *file = fopen("mnist_test.info2", "rb"); // opening the file
    
    bufferCount = fread(&verifyWord, 27, 1, file);
    if (bufferCount != 1 || verifyWord != FILE_HEADER_STRING) {
        strerror("Error: wrong file or unable to read the file!");
        // return error code;
    }

    bufferCount = 0;
    bufferCount = fread(&NumberOfImages, 2, 1, file);
    if (bufferCount != 1) {
        strerror("Error: failed to read number of pictures");
        // return error code
    }

    bufferCount = 0;
    bufferCount = fread(&PictureWidth, 2, 1, file);
    if (bufferCount != 1) {
        strerror("Error: failed to read the picture width!");
        // return error code
    }

    bufferCount = 0;
    bufferCount = fread(&PictureHeight, 2, 1, file);
    if (bufferCount != 1) {
        strerror("Error: failed to read the picture height!");
        // return error code
    }

    return series;
}

// TODO Vervollständigen Sie die Funktion clearSeries, welche eine Bildserie vollständig aus dem Speicher freigibt
void clearSeries(GrayScaleImageSeries *series)
{
}