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

#include <jpeglib.h>
#include <argtable2.h>
#include <string.h>

const char * input_file;
const char * output_file;
const char * filter;
const char * axis;
const char * direction;
double times;



/* we will be using this uninitialized pointer later to store raw, uncompressd image */
JSAMPARRAY row_pointers = NULL;


/* dimensions of the image we want to write */
JDIMENSION width;
JDIMENSION height;
int num_components;
int quality = 75;
J_COLOR_SPACE color_space;

void flip()
{
    int x, y;
    if (color_space != JCS_RGB)  return;

    printf("axis = '%s'\n", axis);
    if(strcmp(axis,"y")==0)
    {
        printf("Jestem w osi y");
        for (y=0; y<height; y++)
        {
            JSAMPROW row = row_pointers[y];
            for (x=0; x<width/2; x++)
            {
                JSAMPROW ptr1 = &(row[x*3]);
                JSAMPROW ptr2 = &(row[(width-1-x)*3]);
                JSAMPLE tmp;
                tmp=ptr1[0];
                ptr1[0]=ptr2[0];
                ptr2[0]=tmp;
                tmp=ptr1[1];
                ptr1[1]=ptr2[1];
                ptr2[1]=tmp;
                tmp=ptr1[2];
                ptr1[2]=ptr2[2];
                ptr2[2]=tmp;
            }
        }
    }
    else if(strcmp(axis,"x")==0)
    {
        printf("Jestem w osi x");
        for (y=0; y<height/2; y++)
        {
            JSAMPROW row1 = row_pointers[y];
            JSAMPROW row2 = row_pointers[height-1-y];

            for (x=0; x<width; x++)
            {
                JSAMPROW ptr1 = &(row1[x*3]);
                JSAMPROW ptr2 = &(row2[x*3]);
                JSAMPLE tmp;
                tmp=ptr1[0];
                ptr1[0]=ptr2[0];
                ptr2[0]=tmp;
                tmp=ptr1[1];
                ptr1[1]=ptr2[1];
                ptr2[1]=tmp;
                tmp=ptr1[2];
                ptr1[2]=ptr2[2];
                ptr2[2]=tmp;
            }
        }
    }
}

void rotate()
{
    int x,y;
    JSAMPARRAY old_pointers = row_pointers;

    JDIMENSION old_width=width;
    JDIMENSION old_height=height;

    width=old_height;
    height=old_width;

    size_t rowbytes = width * num_components;
    row_pointers = (JSAMPARRAY) malloc(sizeof(j_common_ptr) * height);
    for (y=0; y<height; y++)
    {
        row_pointers[y] = (JSAMPROW) malloc(rowbytes);
    }

    if(strcmp(direction, "left")==0)
    {
        printf("Krece w lewo");
        for (y=0; y<old_height; y++)
        {
            for (x=0; x<old_width; x++)
            {
                JSAMPROW src = old_pointers[y];
                JSAMPROW dst = row_pointers[old_width - 1 - x];

                int src_index = x * 3;
                int dst_index = y * 3;

                dst[dst_index + 0] = src[src_index + 0];
                dst[dst_index + 1] = src[src_index + 1];
                dst[dst_index + 2] = src[src_index + 2];
            }
        }
    }
    else if(strcmp(direction, "right")==0)
    {
        printf("Krece w prawo");
        for (y=0; y<old_height; y++)
        {
            for (x=0; x<old_width; x++)
            {
                JSAMPROW src = old_pointers[y];
                JSAMPROW dst = row_pointers[x];

                int src_index = x * 3;
                int dst_index = (old_height - 1 - y) * 3;

                dst[dst_index + 0] = src[src_index + 0];
                dst[dst_index + 1] = src[src_index + 1];
                dst[dst_index + 2] = src[src_index + 2];
            }
        }
    }

    for (y = 0; y < old_height; y++)
    {
        free(old_pointers[y]);
    }

    free(old_pointers);
}

void process_file()
{
    if(strcmp(filter, "flip") ==0 )
    {
        flip();
    }
    if(strcmp(filter, "rotate") ==0 )
    {
        rotate();
    }
}




void abort_(const char * s, ...)
{
    va_list args;
    va_start(args, s);
    vfprintf(stderr, s, args);
    fprintf(stderr, "\n");
    va_end(args);
    abort();
}


/**
 * read_jpeg_file Reads from a jpeg file on disk specified by filename and saves into the
 * raw_image buffer in an uncompressed format.
 *
 * \returns positive integer if successful, -1 otherwise
 * \param *filename char string specifying the file name to read from
 *
 */

void read_jpeg_file( const char *filename )
{
    /* these are standard libjpeg structures for reading(decompression) */
    struct jpeg_decompress_struct cinfo;
    struct jpeg_error_mgr jerr;
    /* libjpeg data structure for storing one row, that is, scanline of an image */
    int y;

    FILE *infile = fopen( filename, "rb" );

    if ( !infile )
    {
        abort_("Error opening input jpeg file %s!\n", filename);
    }
    /* here we set up the standard libjpeg error handler */
    cinfo.err = jpeg_std_error( &jerr );
    jpeg_create_decompress( &cinfo );
    /* this makes the library read from infile */
    jpeg_stdio_src( &cinfo, infile );
    /* reading the image header which contains image information */
    jpeg_read_header( &cinfo, TRUE );


    /* Start decompression jpeg here */
    jpeg_start_decompress( &cinfo );
    width = cinfo.output_width;
    height = cinfo.output_height;
    num_components = cinfo.out_color_components;
    color_space = cinfo.out_color_space;

    /* allocate memory to hold the uncompressed image */
    size_t rowbytes = width * num_components;
    row_pointers = (JSAMPARRAY) malloc(sizeof(j_common_ptr) * height);
    for (y=0; y<height; y++)
    {
        row_pointers[y] = (JSAMPROW) malloc(rowbytes);
    }


    /* read one scan line at a time */
    y=0;
    JSAMPARRAY tmp = row_pointers;
    while( cinfo.output_scanline < cinfo.image_height )
    {
        y = jpeg_read_scanlines( &cinfo, tmp, 1 );
        tmp +=y;
    }
    /* wrap up decompression, destroy objects, free pointers and close open files */
    jpeg_finish_decompress( &cinfo );
    jpeg_destroy_decompress( &cinfo );
// 	free( row_pointer[0] );
    fclose( infile );
    /* yup, we succeeded! */
}




/**
 * write_jpeg_file Writes the raw image data stored in the raw_image buffer
 * to a jpeg image with default compression and smoothing options in the file
 * specified by *filename.
 *
 * \returns positive integer if successful, -1 otherwise
 * \param *filename char string specifying the file name to save to
 *
 */
void write_jpeg_file( const char *filename )
{
    struct jpeg_compress_struct cinfo;
    struct jpeg_error_mgr jerr;
    int y;
    JSAMPARRAY tmp;


    /* this is a pointer to one row of image data */
    FILE *outfile = fopen( filename, "wb" );

    if ( !outfile )
    {
        abort_("Error opening output jpeg file %s!\n", filename );
    }
    cinfo.err = jpeg_std_error( &jerr );
    jpeg_create_compress(&cinfo);
    jpeg_stdio_dest(&cinfo, outfile);

    /* Setting the parameters of the output file here */
    cinfo.image_width = width;
    cinfo.image_height = height;
    cinfo.input_components = num_components;
    cinfo.in_color_space = color_space;
    /* default compression parameters, we shouldn't be worried about these */
    jpeg_set_defaults( &cinfo );
    jpeg_set_quality (&cinfo, quality, TRUE);
    /* Now do the compression .. */
    jpeg_start_compress( &cinfo, TRUE );
    /* like reading a file, this time write one row at a time */
    tmp = row_pointers;
    while( cinfo.next_scanline < cinfo.image_height )
    {
        y = jpeg_write_scanlines( &cinfo, tmp, 1 );
        tmp +=y;
    }
    /* similar to read file, clean up after we're done compressing */
    jpeg_finish_compress( &cinfo );
    jpeg_destroy_compress( &cinfo );
    fclose( outfile );

    /* cleanup heap allocation */
    for (y=0; y<height; y++)
    {
        free(row_pointers[y]);
    }
    free(row_pointers);
}




int main(int argc, char **argv)
{
    // Options
    struct arg_file *input_file_arg = arg_file1("i", "in-file", "<input>", "Input JPEG File");
    struct arg_file *output_file_arg = arg_file1("o", "out-file", "<output>", "Output JPEG File");
    struct arg_str *filter_arg = arg_str1("f", "filter", "<filter>", "Filter");
    struct arg_str *axis_arg = arg_str0("a", "axis", "<axis>", "Flip axis");
    struct arg_str *direction_arg = arg_str0("d", "direction", "<direction>", "Rotate in direction");
    struct arg_dbl *times_arg = arg_dbl0("t", "times", "<times>", "Multiplyer");
    struct arg_lit *help = arg_lit0("h","help", "print this help and exit");
    struct arg_end *end = arg_end(10); // maksymalna liczba błędów 10

    int nerrors;

    void *argtable[] = {input_file_arg, output_file_arg, filter_arg, axis_arg, direction_arg, times_arg, help, end};

    if (arg_nullcheck(argtable) != 0) printf("error: insufficient memory\n");

    times_arg->dval[0] = 1;
    axis_arg->sval[0]="y";
    direction_arg->sval[0]="left";

    nerrors = arg_parse(argc, argv, argtable);

    if (help->count > 0)
    {
        printf("Usage: geometry");
        arg_print_syntax(stdout, argtable,"\n");
        arg_print_glossary(stdout, argtable,"  %-25s %s\n");
        arg_freetable(argtable, sizeof(argtable)/sizeof(argtable[0]));
        return 0;
    }

    if (nerrors==0)
    {
        input_file = input_file_arg->filename[0];
        output_file = output_file_arg->filename[0];
        filter = filter_arg->sval[0];
        direction = direction_arg->sval[0];
        axis = axis_arg->sval[0];
        times = times_arg->dval[0];
    }
    else
    {
        arg_print_errors(stderr, end, "point");
        arg_print_glossary(stderr, argtable, " %-25s %s\n");
        arg_freetable(argtable, sizeof(argtable)/sizeof(argtable[0]));
        return 1;
    }

    read_jpeg_file(input_file);
    process_file();
    write_jpeg_file(output_file);
    arg_freetable(argtable, sizeof(argtable)/sizeof(argtable[0]));
    return 0;
}