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

#include <girara/statusbar.h>
#include <girara/session.h>
#include <girara/settings.h>
#include <girara/utils.h>
#include <stdlib.h>
#include <gtk/gtk.h>
#include <string.h>
#include <glib/gi18n.h>

#include "callbacks.h"
#include "zathura.h"
#include "render.h"
#include "document.h"
#include "utils.h"
#include "shortcuts.h"
#include "page-widget.h"
#include "page.h"

gboolean
cb_destroy(GtkWidget* UNUSED(widget), zathura_t* zathura)
{
  if (zathura != NULL && zathura->document != NULL) {
    document_close(zathura, false);
  }

  gtk_main_quit();
  return TRUE;
}

void
cb_buffer_changed(girara_session_t* session)
{
  g_return_if_fail(session != NULL);
  g_return_if_fail(session->global.data != NULL);

  zathura_t* zathura = session->global.data;

  char* buffer = girara_buffer_get(session);
  if (buffer != NULL) {
    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* GIRARA_UNUSED(adjustment), gpointer data)
{
  zathura_t* zathura = data;
  if (zathura == NULL || zathura->document == NULL || zathura->ui.page_widget == NULL) {
    return;
  }

  GtkAdjustment* view_vadjustment = gtk_scrolled_window_get_vadjustment(GTK_SCROLLED_WINDOW(zathura->ui.session->gtk.view));
  GtkAdjustment* view_hadjustment = gtk_scrolled_window_get_hadjustment(GTK_SCROLLED_WINDOW(zathura->ui.session->gtk.view));

  GdkRectangle view_rect;
  /* get current adjustment values */
  view_rect.y      = 0;
  view_rect.height = gtk_adjustment_get_page_size(view_vadjustment);
  view_rect.x      = 0;
  view_rect.width  = gtk_adjustment_get_page_size(view_hadjustment);

  int page_padding = 1;
  girara_setting_get(zathura->ui.session, "page-padding", &page_padding);

  GdkRectangle center;
  center.x = (view_rect.width + 1) / 2;
  center.y = (view_rect.height + 1) / 2;
  center.height = center.width = (2 * page_padding) + 1;

  unsigned int number_of_pages = zathura_document_get_number_of_pages(zathura->document);

  bool updated = false;
  /* find page that fits */
  for (unsigned int page_id = 0; page_id < number_of_pages; page_id++) {
    zathura_page_t* page = zathura_document_get_page(zathura->document, page_id);
    double scale = zathura_page_get_scale(page);

    GdkRectangle page_rect;
    GtkWidget* page_widget = zathura_page_get_widget(zathura, page);
    gtk_widget_translate_coordinates(page_widget,
        zathura->ui.session->gtk.view, 0, 0, &page_rect.x, &page_rect.y);
    page_rect.width  = zathura_page_get_width(page)  * scale;
    page_rect.height = zathura_page_get_height(page) * scale;

    if (gdk_rectangle_intersect(&view_rect, &page_rect, NULL) == TRUE) {
      zathura_page_set_visibility(page, true);
      if (zathura->global.update_page_number == true && updated == false
          && gdk_rectangle_intersect(&center, &page_rect, NULL) == TRUE) {
        zathura_document_set_current_page_number(zathura->document, page_id);
        updated = true;
      }
    } else {
      zathura_page_set_visibility(page, false);
    }
    zathura_page_widget_update_view_time(ZATHURA_PAGE(page_widget));
  }

  statusbar_page_number_update(zathura);
}

void
cb_pages_per_row_value_changed(girara_session_t* session, const char* UNUSED(name), girara_setting_type_t UNUSED(type), void* value, void* UNUSED(data))
{
  g_return_if_fail(value != NULL);
  g_return_if_fail(session != NULL);
  g_return_if_fail(session->global.data != NULL);
  zathura_t* zathura = session->global.data;

  int pages_per_row = *(int*) value;

  if (pages_per_row < 1) {
    pages_per_row = 1;
  }

  page_widget_set_mode(zathura, pages_per_row);

  if (zathura->document != NULL) {
    unsigned int current_page = zathura_document_get_current_page_number(zathura->document);
    page_set_delayed(zathura, current_page);
  }
}

void
cb_index_row_activated(GtkTreeView* tree_view, GtkTreePath* path,
    GtkTreeViewColumn* UNUSED(column), void* data)
{
  zathura_t* zathura = data;
  if (tree_view == NULL || zathura == NULL || zathura->ui.session == NULL) {
    return;
  }

  GtkTreeModel  *model;
  GtkTreeIter   iter;

  g_object_get(tree_view, "model", &model, NULL);

  if(gtk_tree_model_get_iter(model, &iter, path)) {
    zathura_index_element_t* index_element;
    gtk_tree_model_get(model, &iter, 2, &index_element, -1);

    if (index_element == NULL) {
      return;
    }

    sc_toggle_index(zathura->ui.session, NULL, NULL, 0);
    zathura_link_evaluate(zathura, index_element->link);
  }

  g_object_unref(model);
}

bool
cb_sc_follow(GtkEntry* entry, girara_session_t* session)
{
  g_return_val_if_fail(session != NULL, FALSE);
  g_return_val_if_fail(session->global.data != NULL, FALSE);

  zathura_t* zathura = session->global.data;
  bool eval = true;

  char* input = gtk_editable_get_chars(GTK_EDITABLE(entry), 0, -1);
  if (input == NULL || strlen(input) == 0) {
    eval = false;
  }

  int index = 0;
  if (eval == true) {
    index = atoi(input);
    if (index == 0 && g_strcmp0(input, "0") != 0) {
      girara_notify(session, GIRARA_WARNING, _("Invalid input '%s' given."), input);
      eval = false;
    }
    index = index - 1;
  }

  /* set pages to draw links */
  bool invalid_index = true;
  unsigned int number_of_pages = zathura_document_get_number_of_pages(zathura->document);
  for (unsigned int page_id = 0; page_id < number_of_pages; page_id++) {
    zathura_page_t* page = zathura_document_get_page(zathura->document, page_id);
    if (page == NULL || zathura_page_get_visibility(page) == false) {
      continue;
    }

    GtkWidget* page_widget = zathura_page_get_widget(zathura, page);
    g_object_set(page_widget, "draw-links", FALSE, NULL);

    if (eval == true) {
      zathura_link_t* link = zathura_page_widget_link_get(ZATHURA_PAGE(page_widget), index);
      if (link != NULL) {
        zathura_link_evaluate(zathura, link);
        invalid_index = false;
      }
    }
  }

  if (eval == true && invalid_index == true) {
    girara_notify(session, GIRARA_WARNING, _("Invalid index '%s' given."), input);
  }

  g_free(input);

  return (eval == TRUE) ? TRUE : FALSE;
}

void
cb_file_monitor(GFileMonitor* monitor, GFile* file, GFile* UNUSED(other_file), GFileMonitorEvent event, girara_session_t* session)
{
  g_return_if_fail(monitor  != NULL);
  g_return_if_fail(file     != NULL);
  g_return_if_fail(session  != NULL);

  switch (event) {
    case G_FILE_MONITOR_EVENT_CHANGES_DONE_HINT:
    case G_FILE_MONITOR_EVENT_CREATED:
      gdk_threads_enter();
      sc_reload(session, NULL, NULL, 0);
      gdk_threads_leave();
      break;
    default:
      return;
  }
}

static gboolean
password_dialog(gpointer data)
{
  zathura_password_dialog_info_t* dialog = data;

  if (dialog != NULL) {
    girara_dialog(
        dialog->zathura->ui.session,
        "Incorrect password. Enter password:",
        true,
        NULL,
        (girara_callback_inputbar_activate_t) cb_password_dialog,
        dialog
      );
  }

  return FALSE;
}

bool
cb_password_dialog(GtkEntry* entry, zathura_password_dialog_info_t* dialog)
{
  if (entry == NULL || dialog == NULL) {
    goto error_ret;
  }

  if (dialog->path == NULL) {
    free(dialog);
    goto error_ret;
  }

  if (dialog->zathura == NULL) {
    goto error_free;
  }

  char* input = gtk_editable_get_chars(GTK_EDITABLE(entry), 0, -1);

  /* no or empty password: ask again */
  if (input == NULL || strlen(input) == 0) {
    if (input != NULL) {
      g_free(input);
    }

    gdk_threads_add_idle(password_dialog, dialog);
    return false;
  }

  /* try to open document again */
  if (document_open(dialog->zathura, dialog->path, input) == false) {
    gdk_threads_add_idle(password_dialog, dialog);
  } else {
    g_free(dialog->path);
    free(dialog);
  }

  g_free(input);

  return true;

error_free:

    g_free(dialog->path);
    free(dialog);

error_ret:

  return false;
}

bool
cb_view_resized(GtkWidget* UNUSED(widget), GtkAllocation* allocation, zathura_t* zathura)
{
  if (zathura == NULL || zathura->document == NULL) {
    return false;
  }

  static int height = -1;
  static int width = -1;

  /* adjust only if the allocation changed */
  if (width != allocation->width || height != allocation->height) {
    girara_argument_t argument = { zathura_document_get_adjust_mode(zathura->document), NULL };
    sc_adjust_window(zathura->ui.session, &argument, NULL, 0);

    width  = allocation->width;
    height = allocation->height;
  }

  return false;
}

void
cb_setting_recolor_change(girara_session_t* session, const char* name,
    girara_setting_type_t UNUSED(type), void* value, void* UNUSED(data))
{
  g_return_if_fail(value != NULL);
  g_return_if_fail(session != NULL);
  g_return_if_fail(session->global.data != NULL);
  g_return_if_fail(name != NULL);
  zathura_t* zathura = session->global.data;

  bool bool_value = *((bool*) value);

  if (zathura->global.recolor != bool_value) {
    zathura->global.recolor = bool_value;
    render_all(zathura);
  }
}

bool
cb_unknown_command(girara_session_t* session, const char* input)
{
  g_return_val_if_fail(session != NULL, false);
  g_return_val_if_fail(session->global.data != NULL, false);
  g_return_val_if_fail(input != NULL, false);

  zathura_t* zathura = session->global.data;

  if (zathura->document == NULL) {
    return false;
  }

  /* check for number */
  for (unsigned int i = 0; i < strlen(input); i++) {
    if (g_ascii_isdigit(input[i]) == FALSE) {
      return false;
    }
  }

  page_set(zathura, atoi(input) - 1);

  return true;
}