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#include<stdio.h>
#include<stdlib.h>

typedef struct {
    unsigned char red,green,blue;
} PPMPixel;

typedef struct {
    int x, y;
    PPMPixel *data;
} PPMImage;

#define CREATOR "RPFELGUEIRAS"
#define RGB_COMPONENT_COLOR 255

static PPMImage *readPPM(const char *filename)
{
    char buff[16];
    PPMImage *img;
    FILE *fp;
    int rgb_comp_color;
    fp = fopen(filename, "rb");
// DEBUG
    if (!fp) {
        fprintf(stderr, "Unable to open file '%s'\n", filename);
        exit(1);
    }

    if (!fgets(buff, sizeof(buff), fp)) {
        perror(filename);
        exit(1);
    }

    //alloc memory form image
    img = (PPMImage *)malloc(sizeof(PPMImage));
    if (!img) {
        fprintf(stderr, "Unable to allocate memory\n");
        exit(1);
    }

    //read image size information
    if (fscanf(fp, "%d %d", &img->x, &img->y) != 2) {
        fprintf(stderr, "Invalid image size (error loading '%s')\n", filename);
        exit(1);
    }

    //read rgb component
    if (fscanf(fp, "%d", &rgb_comp_color) != 1) {
        fprintf(stderr, "Invalid rgb component (error loading '%s')\n", filename);
        exit(1);
    }

    while (fgetc(fp) != '\n') ;
    //memory allocation for pixel data
    img->data = (PPMPixel*)malloc(img->x * img->y * sizeof(PPMPixel));

    if (!img) {
        fprintf(stderr, "Unable to allocate memory\n");
        exit(1);
    }

    //read pixel data from file
    if (fread(img->data, 3 * img->x, img->y, fp) != img->y) {
        fprintf(stderr, "Error loading image '%s'\n", filename);
        exit(1);
    }

    fclose(fp);
    return img;
}

void writePPM(const char *filename, PPMImage *img)
{
    FILE *fp = fopen(filename, "wb");
    if (!fp) {
        fprintf(stderr, "Unable to open file '%s'\n", filename);
        exit(1);
    }
    //image header
    fprintf(fp, "P6\n%d\n%d\n%d\n",img->x,img->y,RGB_COMPONENT_COLOR);
    // pixel data
    fwrite(img->data, 3 * img->x, img->y, fp);
    fclose(fp);
}

int main(){
    PPMImage *image;
    image = readPPM("test.ppm");
    writePPM("out.ppm",image);
    printf("Press any key...");
    getchar();
}