/*
 * testing program for the boundingbox function
 */

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

#include <poppler.h>

/*
 * compare floating-point coordinates
 */
int equal(double a, double b, double precision)
{
    return fabs(a - b) < precision;
}

/*
 * main
 */
int main(int argc, char *argv[])
{
    GFile *infile;
    PopplerDocument *doc;
    PopplerPage *page;
    int npages, n;
    gboolean hg;
    PopplerRectangle bb, correct;
    GError *err = NULL;
    int argx;
    double precision = 0.01;

    /* open file */

    g_print("file: %s\n", argv[1]);
    infile = g_file_new_for_path(argv[1]);
    if (!infile)
        exit(EXIT_FAILURE);

    doc = poppler_document_new_from_gfile(infile, NULL, NULL, &err);
    if (doc == NULL) {
        g_printerr("error opening pdf file: %s\n", err->message);
        g_error_free(err);
        exit(EXIT_FAILURE);
    }

    /* precision */

    argx = 2;
    if (!strcmp(argv[argx], "-p")) {
        precision = atof(argv[argx + 1]);
        argx += 2;
    }

    /* pages */

    npages = poppler_document_get_n_pages(doc);
    if (npages < 1) {
        g_printerr("no page in document\n");
        exit(EXIT_FAILURE);
    }

    /* check the bounding box */

    for (n = 0; n < poppler_document_get_n_pages(doc); n++) {
        g_print("    page: %d\n", n + 1);

        page = poppler_document_get_page(doc, n);
        hg = poppler_page_get_bounding_box(page, &bb);
        if (!hg) {
            g_printerr("no graphics in page\n");
            exit(EXIT_FAILURE);
        }
        g_print("        bounding box: %g,%g - %g,%g\n", bb.x1, bb.y1, bb.x2, bb.y2);

        if (argc - argx < 4) {
            g_print("not enough arguments\n");
            exit(EXIT_FAILURE);
        }
        correct.x1 = atof(argv[argx++]);
        correct.y1 = atof(argv[argx++]);
        correct.x2 = atof(argv[argx++]);
        correct.y2 = atof(argv[argx++]);
        g_print("        correct:      %g,%g - %g,%g\n", correct.x1, correct.y1, correct.x2, correct.y2);
        if (!equal(bb.x1, correct.x1, precision) || !equal(bb.x2, correct.x2, precision) || !equal(bb.y1, correct.y1, precision) || !equal(bb.x2, correct.x2, precision)) {
            g_print("bounding box differs from expected\n");
            exit(EXIT_FAILURE);
        }

        g_object_unref(page);
    }

    return EXIT_SUCCESS;
}