/* gcal-edit-calendar-page.c
 *
 * Copyright 2019 Georges Basile Stavracas Neto <georges.stavracas@gmail.com>
 *
 * 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 3 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/>.
 *
 * SPDX-License-Identifier: GPL-3.0-or-later
 */

#define G_LOG_DOMAIN "GcalEditCalendarPage"

#include "gcal-context.h"
#include "gcal-calendar-management-page.h"
#include "gcal-debug.h"
#include "gcal-edit-calendar-page.h"
#include "gcal-utils.h"

#include <glib/gi18n.h>

struct _GcalEditCalendarPage
{
  AdwNavigationPage   parent;

  AdwActionRow       *account_row;
  GtkColorDialogButton *calendar_color_button;
  AdwSwitchRow       *calendar_visible_row;
  AdwActionRow       *calendar_url_row;
  AdwEntryRow        *name_entry;
  GtkWidget          *remove_button_row;

  GcalCalendar       *calendar;
};

static void          gcal_calendar_management_page_iface_init    (GcalCalendarManagementPageInterface *iface);

G_DEFINE_TYPE_WITH_CODE (GcalEditCalendarPage, gcal_edit_calendar_page, ADW_TYPE_NAVIGATION_PAGE,
                         G_IMPLEMENT_INTERFACE (GCAL_TYPE_CALENDAR_MANAGEMENT_PAGE,
                                                gcal_calendar_management_page_iface_init))


/*
 * Auxiliary methods
 */

static gboolean
is_goa_calendar (GcalEditCalendarPage *self,
                 GcalCalendar         *calendar)
{
  g_autoptr (ESource) parent = NULL;
  GcalContext *context;
  GcalManager *manager;
  ESource *source;

  g_assert (calendar && GCAL_IS_CALENDAR (calendar));

  context = gcal_application_get_context (GCAL_DEFAULT_APPLICATION);
  manager = gcal_context_get_manager (context);

  source = gcal_calendar_get_source (calendar);
  parent = gcal_manager_get_source (manager, e_source_get_parent (source));

  return e_source_has_extension (parent, E_SOURCE_EXTENSION_GOA);
}

static gboolean
is_remote_source (ESource *source)
{
  gboolean has_webdav, has_auth;

  g_assert (E_IS_SOURCE (source));

  has_webdav = e_source_has_extension (source, E_SOURCE_EXTENSION_WEBDAV_BACKEND);
  has_auth = e_source_has_extension (source, E_SOURCE_EXTENSION_AUTHENTICATION);

  if (!has_webdav || !has_auth)
    return FALSE;

  if (has_auth)
    {
      ESourceAuthentication *auth;

      auth = e_source_get_extension (source, E_SOURCE_EXTENSION_AUTHENTICATION);

      /* No host is set, it's not a remote source */
      if (!e_source_authentication_get_host (auth))
        return FALSE;
    }

  if (has_webdav)
    {
      ESourceWebdav *webdav;

      webdav = e_source_get_extension (source, E_SOURCE_EXTENSION_WEBDAV_BACKEND);

      /* No resource path specified, not a remote source */
      if (!e_source_webdav_get_resource_path (webdav))
        return FALSE;
    }

  return TRUE;
}

static void
setup_calendar (GcalEditCalendarPage *self,
                GcalCalendar         *calendar)
{
  ESource *source;
  gboolean is_remote;
  gboolean is_file;
  gboolean is_goa;

  self->calendar = g_object_ref (calendar);

  is_goa = is_goa_calendar (self, calendar);
  source = gcal_calendar_get_source (calendar);
  is_file = e_source_has_extension (source, E_SOURCE_EXTENSION_LOCAL_BACKEND);
  is_remote = is_remote_source (source);

  GCAL_TRACE_MSG ("Calendar '%s' is GOA: %d; is file: %d; is remote: %d",
                  gcal_calendar_get_name (calendar),
                  is_goa,
                  is_file,
                  is_remote);

  gtk_widget_set_visible (GTK_WIDGET (self->account_row), is_goa);
  gtk_widget_set_visible (GTK_WIDGET (self->calendar_url_row), !is_goa);

  /* If it's a file, set the file path */
  if (is_file)
    {
      g_autofree gchar *basename = NULL;
      g_autofree gchar *text = NULL;
      g_autofree gchar *uri = NULL;
      ESourceLocal *local;
      GFile *file;

      local = e_source_get_extension (source, E_SOURCE_EXTENSION_LOCAL_BACKEND);
      file = e_source_local_get_custom_file (local);
      basename = g_file_get_basename (file);
      uri = g_file_get_uri (file);

      text = g_strdup_printf ("<a title=\"%1$s\" href=\"%2$s\">%1$s</a>", basename, uri);
      adw_action_row_set_subtitle (self->calendar_url_row, text);

      gtk_accessible_update_property (GTK_ACCESSIBLE (self->calendar_url_row),
                                      GTK_ACCESSIBLE_PROPERTY_LABEL, basename,
                                      -1);
    }

  /* If it's remote, build the uri */
  if (is_remote)
    {
      g_autoptr (GUri) guri = NULL;
      g_autofree gchar *text = NULL;
      g_autofree gchar *uri = NULL;
      ESourceWebdav *webdav;

      webdav = e_source_get_extension (source, E_SOURCE_EXTENSION_WEBDAV_BACKEND);
      guri = e_source_webdav_dup_uri (webdav);
      uri = g_uri_to_string_partial (guri, G_URI_HIDE_PASSWORD);
      text = g_strdup_printf ("<a title=\"%1$s\" href=\"%1$s\">%1$s</a>", uri);

      adw_preferences_row_set_title (ADW_PREFERENCES_ROW (self->calendar_url_row), _("Calendar URL"));
      adw_action_row_set_subtitle (self->calendar_url_row, text);

      gtk_accessible_update_property (GTK_ACCESSIBLE (self->calendar_url_row),
                                      GTK_ACCESSIBLE_PROPERTY_LABEL, uri,
                                      -1);
    }

  if (is_goa)
    {
      const gchar *parent_name = e_source_get_display_name (gcal_calendar_get_parent_source (calendar));

      adw_action_row_set_subtitle (self->account_row, parent_name);
    }

  if (!is_goa && !is_remote && !is_file)
    {
      adw_preferences_row_set_title (ADW_PREFERENCES_ROW (self->calendar_url_row), _("Location"));
      adw_action_row_set_subtitle (self->calendar_url_row, _("On This Computer"));
    }

  gtk_color_dialog_button_set_rgba (self->calendar_color_button, gcal_calendar_get_color (calendar));
  gtk_editable_set_text (GTK_EDITABLE (self->name_entry), gcal_calendar_get_name (calendar));
  adw_switch_row_set_active (self->calendar_visible_row, gcal_calendar_get_visible (calendar));

  gtk_widget_set_visible (self->remove_button_row, e_source_get_removable (source));
}

/*
 * Callbacks
 */

static void
on_calendar_color_changed_cb (GtkColorDialogButton *button,
                              GParamSpec           *pspec,
                              GcalEditCalendarPage *self)
{
  gcal_calendar_set_color (self->calendar, gtk_color_dialog_button_get_rgba (button));
}

static void
on_calendar_visibility_changed_cb (AdwSwitchRow         *row,
                                   GParamSpec           *pspec,
                                   GcalEditCalendarPage *self)
{
  gcal_calendar_set_visible (self->calendar, adw_switch_row_get_active (row));
}

typedef struct
{
  GHashTable *zones;
  ECalClient *client;
} TimeZoneData;

static void
insert_tz_comps (ICalParameter *param,
                 gpointer       data)
{
  g_autoptr (GError) error = NULL;
  TimeZoneData *tdata = data;
  ICalTimezone *zone = NULL;
  ICalComponent *tzcomp;
  const gchar *tzid;

  tzid = i_cal_parameter_get_tzid (param);

  if (g_hash_table_lookup (tdata->zones, tzid))
    return;

  if (!e_cal_client_get_timezone_sync (tdata->client, tzid, &zone, NULL, &error))
    zone = NULL;

  if (error != NULL)
    {
      g_warning ("Could not get the timezone information for %s: %s", tzid, error->message);
      return;
    }

  tzcomp = i_cal_component_clone (i_cal_timezone_get_component (zone));
  g_hash_table_insert (tdata->zones, (gpointer) tzid, (gpointer) tzcomp);
}

static void
append_tz_to_comp (gpointer       key,
                   gpointer       value,
                   ICalComponent *toplevel)
{
  i_cal_component_add_component (toplevel, (ICalComponent *) value);
}

static void
on_file_dialog_save_cb (GObject      *object,
                        GAsyncResult *res,
                        gpointer      user_data)
{
  GcalEditCalendarPage *self = user_data;
  g_autofree gchar *ics_str = NULL;
  g_autoptr (GError) error = NULL;
  g_autoptr (GSList) events = NULL;
  g_autoptr (GFile) file = NULL;
  ICalComponent *toplevel_component = NULL;
  ECalClient *client = NULL;
  TimeZoneData tz_data;

  file = gtk_file_dialog_save_finish (GTK_FILE_DIALOG (object), res, &error);
  if (error)
    {
      if (!g_error_matches (error, GTK_DIALOG_ERROR, GTK_DIALOG_ERROR_DISMISSED))
        g_warning ("Error saving file: %s", error->message);
      return;
    }

  client = gcal_calendar_get_client (self->calendar);
  e_cal_client_get_object_list_sync (client, "#t", &events, NULL, NULL);

  /* Avoid exporting empty calendars */
  if (!events)
    return;

  toplevel_component = e_cal_util_new_top_level ();
  tz_data.zones = g_hash_table_new (g_str_hash, g_str_equal);
  tz_data.client = client;

  for (GSList *l = events; l != NULL; l = l->next)
   {
      ICalComponent *component = i_cal_component_clone (l->data);

      i_cal_component_foreach_tzid (component, insert_tz_comps, &tz_data);
      i_cal_component_take_component (toplevel_component, g_steal_pointer (&component));
    }

  g_hash_table_foreach (tz_data.zones, (GHFunc) append_tz_to_comp, toplevel_component);
  g_clear_pointer (&tz_data.zones, g_hash_table_destroy);

  i_cal_component_strip_errors (toplevel_component);
  ics_str = i_cal_component_as_ical_string (toplevel_component);

  g_clear_pointer (&toplevel_component, i_cal_component_free);

  g_file_replace_contents (file,
                           ics_str,
                           strlen (ics_str),
                           NULL,
                           FALSE,
                           G_FILE_CREATE_REPLACE_DESTINATION,
                           NULL,
                           NULL,
                           NULL);
}

static void
on_export_button_row_activated_cb (GtkButton            *button,
                                   GcalEditCalendarPage *self)
{
  g_autofree gchar *filename = NULL;
  GtkFileDialog *file_dialog = NULL;
  GtkWindow *window = NULL;

  GCAL_ENTRY;

  window = GTK_WINDOW (gtk_widget_get_root (GTK_WIDGET (self)));
  file_dialog = gtk_file_dialog_new ();
  filename = g_strconcat (gcal_calendar_get_name (self->calendar), ".ics", NULL);

  gtk_file_dialog_set_title (file_dialog, _("Export Calendar"));
  gtk_file_dialog_set_initial_name (file_dialog, filename);

  gtk_file_dialog_save (file_dialog,
                        window,
                        NULL,
                        on_file_dialog_save_cb,
                        self);


  GCAL_EXIT;
}

static void
on_remove_button_row_activated_cb (GtkButton            *button,
                                   GcalEditCalendarPage *self)
{
  GcalCalendarManagementPage *page;

  GCAL_ENTRY;

  page = GCAL_CALENDAR_MANAGEMENT_PAGE (self);
  gcal_calendar_management_page_switch_page (page, "calendars", self->calendar);

  GCAL_EXIT;
}

static void
on_settings_button_clicked_cb (GtkWidget            *button,
                               GcalEditCalendarPage *self)
{
  g_autoptr (ESource) parent = NULL;
  GApplication *app;
  GcalContext *context;
  GcalManager *manager;
  ESourceGoa *goa;
  ESource *source;

  GCAL_ENTRY;

  context = gcal_application_get_context (GCAL_DEFAULT_APPLICATION);
  manager = gcal_context_get_manager (context);
  source = gcal_calendar_get_source (self->calendar);
  parent = gcal_manager_get_source (manager, e_source_get_parent (source));

  g_assert (e_source_has_extension (parent, E_SOURCE_EXTENSION_GOA));
  goa = e_source_get_extension (parent, E_SOURCE_EXTENSION_GOA);

  app = g_application_get_default ();
  gcal_utils_launch_gnome_settings (g_application_get_dbus_connection (app),
                                    "online-accounts",
                                    e_source_goa_get_account_id (goa));

  GCAL_EXIT;
}


/*
 * GcalCalendarManagementPage iface
 */

static void
gcal_edit_calendar_page_activate (GcalCalendarManagementPage *page,
                                  GcalCalendar               *calendar)
{
  GCAL_ENTRY;

  setup_calendar (GCAL_EDIT_CALENDAR_PAGE (page), calendar);

  GCAL_EXIT;
}

static void
gcal_edit_calendar_page_deactivate (GcalCalendarManagementPage *page)
{
  GcalEditCalendarPage *self;
  GcalContext *context;
  GcalManager *manager;

  GCAL_ENTRY;

  self = GCAL_EDIT_CALENDAR_PAGE (page);

  gcal_calendar_set_name (self->calendar, gtk_editable_get_text (GTK_EDITABLE (self->name_entry)));

  context = gcal_application_get_context (GCAL_DEFAULT_APPLICATION);
  manager = gcal_context_get_manager (context);
  gcal_manager_save_source (manager, gcal_calendar_get_source (self->calendar));

  g_clear_object (&self->calendar);

  GCAL_EXIT;
}

static void
gcal_calendar_management_page_iface_init (GcalCalendarManagementPageInterface *iface)
{
  iface->activate = gcal_edit_calendar_page_activate;
  iface->deactivate = gcal_edit_calendar_page_deactivate;
}


/*
 * GObject overrides
 */

static void
gcal_edit_calendar_page_dispose (GObject *object)
{
  GcalEditCalendarPage *self = GCAL_EDIT_CALENDAR_PAGE (object);

  if (self->calendar)
    gcal_calendar_set_name (self->calendar, gtk_editable_get_text (GTK_EDITABLE (self->name_entry)));

  G_OBJECT_CLASS (gcal_edit_calendar_page_parent_class)->dispose (object);
}

static void
gcal_edit_calendar_page_finalize (GObject *object)
{
  GcalEditCalendarPage *self = (GcalEditCalendarPage *)object;

  g_clear_object (&self->calendar);

  G_OBJECT_CLASS (gcal_edit_calendar_page_parent_class)->finalize (object);
}

static void
gcal_edit_calendar_page_class_init (GcalEditCalendarPageClass *klass)
{
  GObjectClass *object_class = G_OBJECT_CLASS (klass);
  GtkWidgetClass *widget_class = GTK_WIDGET_CLASS (klass);

  object_class->dispose = gcal_edit_calendar_page_dispose;
  object_class->finalize = gcal_edit_calendar_page_finalize;

  gtk_widget_class_set_template_from_resource (widget_class, "/org/gnome/calendar/ui/gui/calendar-management/gcal-edit-calendar-page.ui");

  gtk_widget_class_bind_template_child (widget_class, GcalEditCalendarPage, account_row);
  gtk_widget_class_bind_template_child (widget_class, GcalEditCalendarPage, calendar_color_button);
  gtk_widget_class_bind_template_child (widget_class, GcalEditCalendarPage, calendar_url_row);
  gtk_widget_class_bind_template_child (widget_class, GcalEditCalendarPage, calendar_visible_row);
  gtk_widget_class_bind_template_child (widget_class, GcalEditCalendarPage, name_entry);
  gtk_widget_class_bind_template_child (widget_class, GcalEditCalendarPage, remove_button_row);

  gtk_widget_class_bind_template_callback (widget_class, on_calendar_color_changed_cb);
  gtk_widget_class_bind_template_callback (widget_class, on_calendar_visibility_changed_cb);
  gtk_widget_class_bind_template_callback (widget_class, on_remove_button_row_activated_cb);
  gtk_widget_class_bind_template_callback (widget_class, on_export_button_row_activated_cb);
  gtk_widget_class_bind_template_callback (widget_class, on_settings_button_clicked_cb);
}

static void
gcal_edit_calendar_page_init (GcalEditCalendarPage *self)
{
  gtk_widget_init_template (GTK_WIDGET (self));
}