/* SPDX-License-Identifier: Zlib */

#include "plugin.h"
#include "utils.h"

girara_list_t* pdf_page_links_get(zathura_page_t* page, void* data, zathura_error_t* error) {
  if (page == NULL || data == NULL) {
    if (error != NULL) {
      *error = ZATHURA_ERROR_INVALID_ARGUMENTS;
    }
    goto error_ret;
  }

  girara_list_t* list       = NULL;
  GList* link_mapping       = NULL;
  PopplerPage* poppler_page = data;

  link_mapping = poppler_page_get_link_mapping(poppler_page);
  if (link_mapping == NULL || g_list_length(link_mapping) == 0) {
    if (error != NULL) {
      *error = ZATHURA_ERROR_UNKNOWN;
    }
    goto error_free;
  }
  link_mapping = g_list_reverse(link_mapping);

  list = girara_list_new2((girara_free_function_t)zathura_link_free);
  if (list == NULL) {
    if (error != NULL) {
      *error = ZATHURA_ERROR_OUT_OF_MEMORY;
    }
    goto error_free;
  }

  zathura_document_t* zathura_document = (zathura_document_t*)zathura_page_get_document(page);
  PopplerDocument* poppler_document    = zathura_document_get_data(zathura_document);

  const double page_height = zathura_page_get_height(page);

  for (GList* link = link_mapping; link != NULL; link = g_list_next(link)) {
    PopplerLinkMapping* poppler_link = (PopplerLinkMapping*)link->data;

    /* extract position */
    const zathura_rectangle_t position = {
        .x1 = poppler_link->area.x1,
        .x2 = poppler_link->area.x2,
        .y1 = page_height - poppler_link->area.y2,
        .y2 = page_height - poppler_link->area.y1,
    };

    zathura_link_t* zathura_link = poppler_link_to_zathura_link(poppler_document, poppler_link->action, position);
    if (zathura_link != NULL) {
      girara_list_append(list, zathura_link);
    }
  }

  poppler_page_free_link_mapping(link_mapping);

  return list;

error_free:

  if (list != NULL) {
    girara_list_free(list);
  }

  if (link_mapping != NULL) {
    poppler_page_free_link_mapping(link_mapping);
  }

error_ret:

  return NULL;
}
