/* See LICENSE file for license and copyright information */

#include <callbacks.h>
#include <girara.h>
#include <stdlib.h>
#include <gtk/gtk.h>

#include "zathura.h"
#include "render.h"
#include "ft/document.h"

gboolean
cb_destroy(GtkWidget* widget, gpointer data)
{
  if (Zathura.UI.session) {
    girara_session_destroy(Zathura.UI.session);
  }

  document_close();

  return TRUE;
}

void
buffer_changed(girara_session_t* session)
{
  g_return_if_fail(session != NULL);

  char* buffer = girara_buffer_get(session);

  if (buffer) {
    girara_statusbar_item_set_text(session, Zathura.UI.statusbar.buffer, buffer);
    free(buffer);
  } else {
    girara_statusbar_item_set_text(session, Zathura.UI.statusbar.buffer, "");
  }
}

void
cb_view_vadjustment_value_changed(GtkAdjustment *adjustment, gpointer data)
{
  if (!Zathura.document || !Zathura.document->pages || !Zathura.UI.page_view) {
    return;
  }

  /* get current adjustment values */
  gdouble lower = gtk_adjustment_get_value(adjustment);
  gdouble upper = lower + gtk_adjustment_get_page_size(adjustment);

  /* find page that fits */
  for (unsigned int page_id = 0; page_id < Zathura.document->number_of_pages; page_id++)
  {
    zathura_page_t* page = Zathura.document->pages[page_id];

    /* check for rendered attribute */
    if (page->rendered) {
      continue;
    }

    double begin = page->offset;
    double end   = page->offset + page->height;

    if (    ( (begin >= lower) && (end <= upper) ) /* page is in viewport */
        || ( (begin <= lower) && (end >= lower) && (end <= upper) ) /* end of the page is in viewport */
        || ( (begin >= lower) && (end >= upper) && (begin <= upper) ) /* begin of the page is in viewport */
      ) {
        render_page(Zathura.Sync.render_thread, Zathura.document->pages[page_id]);
    }
  }
}