#include <stdio.h>
#include <stdlib.h>
#include "pnginput.h"
#include "colourspace.h"
#include "triangulation.h"

#define USE_LUV

void read_image( double *data, double *pixeldata,
                 pnginput_t *pnginput, int width, int height )
{
    int i, j;

    for( i = 0; i < height; i++ ) {
        unsigned char *curscanline = pnginput_get_scanline( pnginput, i );

        for( j = 0; j < width; j++ ) {
            double bp = ( (double) curscanline[ 0 ] ) / 255.0;
            double gp = ( (double) curscanline[ 1 ] ) / 255.0;
            double rp = ( (double) curscanline[ 2 ] ) / 255.0;
            double r, g, b, x, y, z, lstar, ustar, vstar;

            nonlinear_to_linear_srgb( rp, gp, bp, &r, &g, &b );
            srgb_to_xyz( r, g, b, &x, &y, &z );
            xyz_to_lupvp( x, y, z, &lstar, &ustar, &vstar );

            *data++ = lstar;
#ifdef USE_LUV
            *pixeldata++ = lstar;
            *pixeldata++ = ustar;
            *pixeldata++ = vstar;
#else
            *pixeldata++ = x;
            *pixeldata++ = y;
            *pixeldata++ = z;
#endif
            curscanline += 3;
        }
    }
}

int main( int argc, char **argv )
{
    pnginput_t *pnginput;
    int width, height;
    double *data;
    double *pixeldata;
    triangulation_t *image;
    int alg, passes;

    pnginput = pnginput_new( argv[ 1 ] );
    if( !pnginput ) {
        fprintf( stderr, "scale: can't open input %s\n", argv[ 1 ] );
        return 1;
    }
    width = pnginput_get_width( pnginput );
    height = pnginput_get_height( pnginput );
    data = (double *) malloc( width * height * sizeof( double ) );
    if( !data ) {
        fprintf( stderr, "scale: can't allocate input data\n" );
        return 1;
    }
    pixeldata = (double *) malloc( 3 * width * height * sizeof( double ) );
    if( !pixeldata ) {
        fprintf( stderr, "scale: can't allocate pixel data\n" );
        return 1;
    }

    read_image( data, pixeldata, pnginput, width, height );
    pnginput_delete( pnginput );

    alg = atoi( argv[ 3 ] );
    passes = atoi( argv[ 4 ] );
    fprintf( stderr, "tri: Input is %dx%d\n", width, height );

    image = initialize_image( data, pixeldata, width, height );
    run_alg( image, alg, passes );
    // print_edges( image );
    save_triangulation( image, argv[ 2 ] );

    return 0;
}