#include <librsvg/rsvg.h>

#include <hexagram/svg.h>

int hexagram_svg_render_to_surface(const char *path,
                                   cairo_surface_t *surface,
                                   double width,
                                   double height,
                                   const char *style) {
    cairo_t *cr;
    RsvgHandle *svg;
    RsvgRectangle rect = {0, 0, width, height};
    GError *err = NULL;

    if ((cr = cairo_create(surface)) == NULL) {
        goto error_cairo_create;
    }

    if ((svg = rsvg_handle_new_from_file(path, &err)) == NULL) {
        goto error_rsvg_handle_new_from_file;
    }

    if (style) {
        if (rsvg_handle_set_stylesheet(svg, (guint8 *)style, strlen(style), &err) != TRUE) {
            goto error_rsvg_handle_set_stylesheet;
        }
    }

    if (rsvg_handle_render_layer(svg, cr, NULL, &rect, &err) != TRUE) {
        goto error_rsvg_handle_render_layer;
    }

    g_object_unref(svg);
    cairo_destroy(cr);

    return 0;

error_rsvg_handle_render_layer:
error_rsvg_handle_set_stylesheet:
    g_object_unref(svg);

error_rsvg_handle_new_from_file:
    cairo_destroy(cr);

error_cairo_create:
    return -1;
}

cairo_surface_t *hexagram_svg_render_to_image(const char *path,
                                              double width,
                                              double height,
                                              const char *style) {
    cairo_surface_t *surface;

    if ((surface = cairo_image_surface_create(CAIRO_FORMAT_ARGB32, width, height)) == NULL) {
        goto error_cairo_image_surface_create;
    }

    if (hexagram_svg_render_to_surface(path, surface, width, height, style) < 0) {
        goto error_render_to_surface;
    }

    return surface;

error_render_to_surface:
    cairo_surface_destroy(surface);

error_cairo_image_surface_create:
    return NULL;
}