/* -*- Mode: C; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 8 -*-
 *
 * Copyright 2012  Red Hat, Inc,
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, see <http://www.gnu.org/licenses/>.
 *
 * Author: Marek Kasik <mkasik@redhat.com>
 */

#include "config.h"

#include <unistd.h>
#include <stdlib.h>

#include <glib.h>
#include <glib/gi18n.h>
#include <glib/gstdio.h>
#include <gtk/gtk.h>
#include <gdesktop-enums.h>

#include <cups/cups.h>

#include "shell/list-box-helper.h"
#include "pp-jobs-dialog.h"
#include "pp-utils.h"
#include "pp-job.h"
#include "pp-cups.h"
#include "pp-printer.h"

#define EMPTY_TEXT "\xe2\x80\x94"

#define CLOCK_SCHEMA "org.gnome.desktop.interface"
#define CLOCK_FORMAT_KEY "clock-format"

static void pp_jobs_dialog_hide (PpJobsDialog *dialog);

struct _PpJobsDialog {
  GtkBuilder *builder;
  GtkWidget  *parent;

  GtkWidget  *dialog;
  GListStore *store;
  GtkListBox *listbox;

  UserResponseCallback user_callback;
  gpointer             user_data;

  gchar *printer_name;

  GCancellable *get_jobs_cancellable;
};

static void
job_stop_cb (GtkButton *button,
             PpJob     *job)
{
  pp_job_cancel_purge_async (job, FALSE);
}

static void
job_pause_cb (GtkButton *button,
              PpJob     *job)
{
  gint job_state;

  g_object_get (job, "state", &job_state, NULL);

  pp_job_set_hold_until_async (job, job_state == IPP_JOB_HELD ? "no-hold" : "indefinite");

  gtk_button_set_image (button,
                        gtk_image_new_from_icon_name (job_state == IPP_JOB_HELD ?
                                                      "media-playback-pause-symbolic" : "media-playback-start-symbolic",
                                                      GTK_ICON_SIZE_SMALL_TOOLBAR));
}

static GtkWidget *
create_listbox_row (gpointer item,
                    gpointer user_data)
{
  PpJob     *job = (PpJob *)item;
  GtkWidget *box;
  GtkWidget *widget;
  gchar     *title;
  gchar     *state_string = NULL;
  gint       job_state;

  g_object_get (job, "title", &title, "state", &job_state, NULL);

  switch (job_state)
    {
      case IPP_JOB_PENDING:
        /* Translators: Job's state (job is waiting to be printed) */
        state_string = g_strdup (C_("print job", "Pending"));
        break;
      case IPP_JOB_HELD:
        /* Translators: Job's state (job is held for printing) */
        state_string = g_strdup (C_("print job", "Paused"));
        break;
      case IPP_JOB_PROCESSING:
        /* Translators: Job's state (job is currently printing) */
        state_string = g_strdup (C_("print job", "Processing"));
        break;
      case IPP_JOB_STOPPED:
        /* Translators: Job's state (job has been stopped) */
        state_string = g_strdup (C_("print job", "Stopped"));
        break;
      case IPP_JOB_CANCELED:
        /* Translators: Job's state (job has been canceled) */
        state_string = g_strdup (C_("print job", "Canceled"));
        break;
      case IPP_JOB_ABORTED:
        /* Translators: Job's state (job has aborted due to error) */
        state_string = g_strdup (C_("print job", "Aborted"));
        break;
      case IPP_JOB_COMPLETED:
        /* Translators: Job's state (job has completed successfully) */
        state_string = g_strdup (C_("print job", "Completed"));
        break;
    }

  box = gtk_box_new (GTK_ORIENTATION_HORIZONTAL, 0);
  g_object_set (box, "margin", 6, NULL);
  gtk_container_set_border_width (GTK_CONTAINER (box), 2);

  widget = gtk_label_new (title);
  gtk_widget_set_halign (widget, GTK_ALIGN_START);
  gtk_box_pack_start (GTK_BOX (box), widget, TRUE, TRUE, 10);

  widget = gtk_label_new (state_string);
  gtk_widget_set_halign (widget, GTK_ALIGN_END);
  gtk_widget_set_margin_end (widget, 64);
  gtk_box_pack_start (GTK_BOX (box), widget, FALSE, FALSE, 10);

  widget = gtk_button_new_from_icon_name (job_state == IPP_JOB_HELD ? "media-playback-start-symbolic" : "media-playback-pause-symbolic",
                                          GTK_ICON_SIZE_SMALL_TOOLBAR);
  g_signal_connect (widget, "clicked", G_CALLBACK (job_pause_cb), item);
  gtk_box_pack_start (GTK_BOX (box), widget, FALSE, FALSE, 4);

  widget = gtk_button_new_from_icon_name ("edit-delete-symbolic",
                                          GTK_ICON_SIZE_SMALL_TOOLBAR);
  g_signal_connect (widget, "clicked", G_CALLBACK (job_stop_cb), item);
  gtk_box_pack_start (GTK_BOX (box), widget, FALSE, FALSE, 4);

  gtk_widget_show_all (box);

  return box;
}

static void
update_jobs_list_cb (GObject      *source_object,
                     GAsyncResult *result,
                     gpointer      user_data)
{
  PpJobsDialog *dialog = user_data;
  PpPrinter    *printer = PP_PRINTER (source_object);
  GtkWidget    *clear_all_button;
  GtkStack     *stack;
  GError       *error = NULL;
  GList        *jobs, *l;
  gint          num_of_jobs;

  g_list_store_remove_all (dialog->store);

  stack = GTK_STACK (gtk_builder_get_object (GTK_BUILDER (dialog->builder), "stack"));
  clear_all_button = GTK_WIDGET (gtk_builder_get_object (GTK_BUILDER (dialog->builder), "jobs-clear-all-button"));

  jobs = pp_printer_get_jobs_finish (printer, result, &error);
  if (error != NULL)
    {
      if (!g_error_matches (error, G_IO_ERROR, G_IO_ERROR_CANCELLED))
        {
          g_warning ("Could not get jobs: %s", error->message);
        }

      g_error_free (error);
      return;
    }

  num_of_jobs = g_list_length (jobs);
  if (num_of_jobs > 0)
    {
      gtk_widget_set_sensitive (clear_all_button, TRUE);
      gtk_stack_set_visible_child_name (stack, "list-jobs-page");
    }
  else
    {
      gtk_widget_set_sensitive (clear_all_button, FALSE);
      gtk_stack_set_visible_child_name (stack, "no-jobs-page");
    }

  for (l = jobs; l != NULL; l = l->next)
    {
      g_list_store_append (dialog->store, l->data);
    }

  g_list_free (jobs);
  g_clear_object (&dialog->get_jobs_cancellable);
}

static void
update_jobs_list (PpJobsDialog *dialog)
{
  PpPrinter *printer;

  if (dialog->printer_name != NULL)
    {
      if (dialog->get_jobs_cancellable != NULL)
        {
          g_cancellable_cancel (dialog->get_jobs_cancellable);
          g_clear_object (&dialog->get_jobs_cancellable);
        }

      dialog->get_jobs_cancellable = g_cancellable_new ();

      printer = pp_printer_new (dialog->printer_name);
      pp_printer_get_jobs_async (printer,
                                 TRUE,
                                 CUPS_WHICHJOBS_ACTIVE,
                                 dialog->get_jobs_cancellable,
                                 update_jobs_list_cb,
                                 dialog);
    }
}

static void
jobs_dialog_response_cb (GtkDialog *dialog,
                         gint       response_id,
                         gpointer   user_data)
{
  PpJobsDialog *jobs_dialog = (PpJobsDialog*) user_data;

  pp_jobs_dialog_hide (jobs_dialog);

  jobs_dialog->user_callback (GTK_DIALOG (jobs_dialog->dialog),
                              response_id,
                              jobs_dialog->user_data);
}

static void
on_clear_all_button_clicked (GtkButton *button,
                             gpointer   user_data)
{
  PpJobsDialog *dialog = user_data;
  guint num_items;
  guint i;

  num_items = g_list_model_get_n_items (G_LIST_MODEL (dialog->store));

  for (i = 0; i < num_items; i++)
    {
      PpJob *job = PP_JOB (g_list_model_get_item (G_LIST_MODEL (dialog->store), i));

      pp_job_cancel_purge_async (job, FALSE);
    }
}

PpJobsDialog *
pp_jobs_dialog_new (GtkWindow            *parent,
                    UserResponseCallback  user_callback,
                    gpointer              user_data,
                    gchar                *printer_name)
{
  PpJobsDialog    *dialog;
  GtkButton       *clear_all_button;
  GError          *error = NULL;
  gchar           *objects[] = { "jobs-dialog", NULL };
  guint            builder_result;
  gchar           *title;

  dialog = g_new0 (PpJobsDialog, 1);

  dialog->builder = gtk_builder_new ();
  dialog->parent = GTK_WIDGET (parent);

  builder_result = gtk_builder_add_objects_from_resource (dialog->builder,
                                                          "/org/gnome/control-center/printers/jobs-dialog.ui",
                                                          objects, &error);

  if (builder_result == 0)
    {
      g_warning ("Could not load ui: %s", error->message);
      g_error_free (error);
      return NULL;
    }

  dialog->dialog = (GtkWidget *) gtk_builder_get_object (dialog->builder, "jobs-dialog");
  dialog->user_callback = user_callback;
  dialog->user_data = user_data;
  dialog->printer_name = g_strdup (printer_name);

  /* connect signals */
  g_signal_connect (dialog->dialog, "delete-event", G_CALLBACK (gtk_widget_hide_on_delete), NULL);
  g_signal_connect (dialog->dialog, "response", G_CALLBACK (jobs_dialog_response_cb), dialog);

  clear_all_button = GTK_BUTTON (gtk_builder_get_object (dialog->builder, "jobs-clear-all-button"));
  g_signal_connect (clear_all_button, "clicked", G_CALLBACK (on_clear_all_button_clicked), dialog);

  /* Translators: This is the printer name for which we are showing the active jobs */
  title = g_strdup_printf (C_("Printer jobs dialog title", "%s — Active Jobs"), printer_name);
  gtk_window_set_title (GTK_WINDOW (dialog->dialog), title);
  g_free (title);

  dialog->listbox = GTK_LIST_BOX (gtk_builder_get_object (dialog->builder, "jobs-listbox"));
  gtk_list_box_set_header_func (dialog->listbox,
                                cc_list_box_update_header_func, NULL, NULL);
  dialog->store = g_list_store_new (pp_job_get_type ());
  gtk_list_box_bind_model (dialog->listbox, G_LIST_MODEL (dialog->store),
                           create_listbox_row, NULL, NULL);

  update_jobs_list (dialog);

  gtk_window_set_transient_for (GTK_WINDOW (dialog->dialog), GTK_WINDOW (parent));
  gtk_window_present (GTK_WINDOW (dialog->dialog));
  gtk_widget_show_all (GTK_WIDGET (dialog->dialog));

  return dialog;
}

void
pp_jobs_dialog_update (PpJobsDialog *dialog)
{
  update_jobs_list (dialog);
}

void
pp_jobs_dialog_set_callback (PpJobsDialog         *dialog,
                             UserResponseCallback  user_callback,
                             gpointer              user_data)
{
  if (dialog != NULL)
    {
      dialog->user_callback = user_callback;
      dialog->user_data = user_data;
    }
}

void
pp_jobs_dialog_free (PpJobsDialog *dialog)
{
  if (dialog->get_jobs_cancellable != NULL)
    {
      g_cancellable_cancel (dialog->get_jobs_cancellable);
      g_clear_object (&dialog->get_jobs_cancellable);
    }

  gtk_widget_destroy (GTK_WIDGET (dialog->dialog));
  dialog->dialog = NULL;

  g_clear_object (&dialog->builder);
  g_free (dialog->printer_name);
  g_free (dialog);
}

static void
pp_jobs_dialog_hide (PpJobsDialog *dialog)
{
  gtk_widget_hide (GTK_WIDGET (dialog->dialog));
}
