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

static resvg_render_tree *tree = NULL;
static resvg_options opt;

void
draw_cb (const char *path)
{
    if (!tree || !path)
        return;

    cairo_rectangle_t docExtents = { 0, 0, 0, 0 };
    resvg_rect viewBox = resvg_get_image_viewbox(tree);
    docExtents.x = viewBox.x;
    docExtents.y = viewBox.y;
    docExtents.width = viewBox.width;
    docExtents.height = viewBox.height;
    cairo_surface_t* cairoSurface = cairo_recording_surface_create( CAIRO_CONTENT_COLOR_ALPHA, &docExtents );
    cairo_t* cr = cairo_create( cairoSurface );

    resvg_size svgSize = { viewBox.width, viewBox.height };
    resvg_cairo_render_to_canvas(tree, &opt, svgSize, cr);
    cairo_destroy( cr );

    cairo_surface_write_to_png( cairoSurface, path );

    double x0, y0, w, h;
    cairo_recording_surface_ink_extents( cairoSurface, &x0, &y0, &w, &h);
    printf("cairo-ink-extent: {%f, %f, %f, %f}\n", x0, y0, w, h);

    cairo_surface_destroy( cairoSurface );
}


void
print_bbox()
{
    resvg_rect viewBox = resvg_get_image_viewbox(tree);
 
    printf("viewBox: {%f, %f, %f, %f}\n", viewBox.x, viewBox.y, viewBox.width, viewBox.height);


    resvg_rect boundingBox;
    resvg_get_image_bbox(tree, &boundingBox);

    printf("boundingBox: {%f, %f, %f, %f}\n", boundingBox.x, boundingBox.y, boundingBox.width, boundingBox.height);
}


void
parse_doc (const char *path)
{
    resvg_init_options(&opt);
    opt.path = path;
    opt.font_family = "Liberation Sans";
    opt.languages = "en";

    int err = resvg_parse_tree_from_file(path, &opt, &tree);
    if (err != RESVG_OK) {
        fprintf(stderr, "Error id: %i\n", err);
        abort();
    }
}

int
main(int argc, char **argv)
{
    if (argc < 3)
       abort();

    parse_doc(argv[1]);
    print_bbox();
    draw_cb(argv[2]);
}