/* iridium-window.c
 *
 * Copyright 2018 Matthias Vogelgesang
 *
 * 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/>.
 */

#include <gtksourceview/gtksource.h>
#include <webkit2/webkit2.h>

#include "iridium-config.h"
#include "iridium-markdown.h"
#include "iridium-note.h"
#include "iridium-note-row.h"
#include "iridium-standard-file.h"
#include "iridium-tag-row.h"
#include "iridium-window.h"

struct _IridiumWindow
{
  GtkApplicationWindow  parent_instance;

  GtkHeaderBar      *header_bar;
  GtkListBox        *tag_list;
  GtkListBox        *note_list;
  GtkWidget         *title_entry;
  GtkWidget         *source_view;
  GtkWidget         *main_pane;
  GtkSearchBar      *search_bar;
  GtkSearchEntry    *search_entry;
  GtkToggleButton   *toggle_html_view;
  GtkRevealer       *notification_revealer;
  WebKitWebView     *html_view;

  GBinding          *title_binding;
  GBinding          *content_binding;

  IridiumMarkdown   *markdown;
  IridiumStandardFile *client;
};

G_DEFINE_TYPE (IridiumWindow, iridium_window, GTK_TYPE_APPLICATION_WINDOW)

static void
on_tag_selected (IridiumWindow *self, IridiumTagRow *row, gpointer user_data)
{
  gtk_list_box_invalidate_filter (self->note_list);
}

static void
on_search_changed (IridiumWindow *self, GtkSearchEntry *entry)
{
  gtk_list_box_invalidate_filter (self->note_list);
}

static void
on_markdown_compiled (GObject *object,
                      GAsyncResult *result,
                      gpointer user_data)
{
  IridiumWindow *window;
  gchar *html;
  GError *error = NULL;

  window = IRIDIUM_WINDOW (user_data);
  html = iridium_markdown_compile_finish (object, result, &error);
  webkit_web_view_load_html (window->html_view, html, NULL);
  g_free (html);
}

static void
on_note_selected (IridiumWindow *self, IridiumNoteRow *row, gpointer user_data)
{
  IridiumNote *note;
  GtkTextBuffer *buffer;
  GBindingFlags flags;
  GtkTextIter start;
  GtkTextIter end;
  gchar *text;

  if (self->title_binding != NULL)
    g_clear_object (&self->title_binding);

  if (self->content_binding != NULL)
    g_clear_object (&self->content_binding);

  if (row == NULL)
    return;

  note = iridium_note_row_get_note (row);
  flags = G_BINDING_BIDIRECTIONAL | G_BINDING_SYNC_CREATE;
  buffer = gtk_text_view_get_buffer (GTK_TEXT_VIEW (self->source_view));
  self->title_binding = g_object_bind_property (note, "title", self->title_entry, "text", flags);
  self->content_binding = g_object_bind_property (note, "content", buffer, "text", flags);

  gtk_text_buffer_get_start_iter (buffer, &start);
  gtk_text_buffer_get_end_iter (buffer, &end);
  text = gtk_text_buffer_get_slice (buffer, &start, &end, FALSE);
  iridium_markdown_compile_async (self->markdown, text, G_PRIORITY_DEFAULT, NULL,
      on_markdown_compiled, self);
  g_free (text);
}

static void
search_activated (GAction *action, GVariant *param, IridiumWindow *self)
{
  gtk_search_bar_set_search_mode (self->search_bar, !gtk_search_bar_get_search_mode (self->search_bar));
}

static gboolean
note_visible (IridiumNoteRow *row, IridiumWindow *window)
{
  IridiumNote *note;
  IridiumTagRow *tag_row;

  tag_row = IRIDIUM_TAG_ROW (gtk_list_box_get_selected_row (window->tag_list));

  if (tag_row == NULL)
    return TRUE;

  note = iridium_note_row_get_note (row);

  if (!iridium_note_has_tag (note, iridium_tag_row_get_tag (tag_row))) {
    return FALSE;
  }

  if (gtk_search_bar_get_search_mode (window->search_bar) &&
      gtk_entry_get_text_length (GTK_ENTRY (window->search_entry)) > 0) {
    return iridium_note_matches_fuzzy (note, gtk_entry_get_text (GTK_ENTRY (window->search_entry)));
  }

  return TRUE;
}

static gint
note_date_cmp (IridiumNoteRow *row1,
               IridiumNoteRow *row2,
               gpointer user_data)
{
  GDateTime *dt1;
  GDateTime *dt2;

  dt1 = iridium_note_get_last_modified (iridium_note_row_get_note (row1));
  dt2 = iridium_note_get_last_modified (iridium_note_row_get_note (row2));

  /* sort later before earlier notes */
  return g_date_time_compare (dt2, dt1);
}

static void
on_standard_file_connected (GObject *object,
                            GAsyncResult *result,
                            gpointer user_data)
{
  IridiumWindow *self;
  GList *notes;
  IridiumTag *tag_all;

  self = IRIDIUM_WINDOW (user_data);
  tag_all = iridium_tag_new ("All");

  /* TODO: implement iridium_standard_file_connect_finish */
  notes = iridium_standard_file_load (self->client, "sn.json");

  for (GList *it = g_list_first (notes); it != NULL; it = g_list_next (it)) {
    IridiumNote *note;

    note = IRIDIUM_NOTE (it->data);
    iridium_note_add_tag (note, tag_all);
    gtk_list_box_insert (self->note_list, iridium_note_row_new (note), -1);
  }

  gtk_list_box_insert (self->tag_list, iridium_tag_row_new (tag_all), -1);
  g_list_free (notes);

  gtk_widget_show_all (GTK_WIDGET (self->note_list));
  gtk_widget_show_all (GTK_WIDGET (self->tag_list));

  gtk_revealer_set_reveal_child (self->notification_revealer, FALSE);
}

static void
on_notification_close_clicked (IridiumWindow *self,
                               GtkButton *button)
{
  gtk_revealer_set_reveal_child (self->notification_revealer, FALSE);
}

static void
iridium_window_dispose (GObject *object)
{
  IridiumWindow *self;

  self = IRIDIUM_WINDOW (object);
  g_clear_object (&self->title_binding);
  g_clear_object (&self->content_binding);
  g_clear_object (&self->markdown);
  g_clear_object (&self->client);
  G_OBJECT_CLASS (iridium_window_parent_class)->dispose (object);
}

static void
iridium_window_class_init (IridiumWindowClass *klass)
{
  GObjectClass *oclass;
  GtkWidgetClass *widget_class;

  oclass = G_OBJECT_CLASS (klass);
  widget_class = GTK_WIDGET_CLASS (klass);

  oclass->dispose = iridium_window_dispose;

  gtk_widget_class_set_template_from_resource (widget_class, "/net/bloerg/Iridium/iridium-window.ui");
  gtk_widget_class_bind_template_child (widget_class, IridiumWindow, header_bar);
  gtk_widget_class_bind_template_child (widget_class, IridiumWindow, tag_list);
  gtk_widget_class_bind_template_child (widget_class, IridiumWindow, note_list);
  gtk_widget_class_bind_template_child (widget_class, IridiumWindow, source_view);
  gtk_widget_class_bind_template_child (widget_class, IridiumWindow, title_entry);
  gtk_widget_class_bind_template_child (widget_class, IridiumWindow, main_pane);
  gtk_widget_class_bind_template_child (widget_class, IridiumWindow, search_bar);
  gtk_widget_class_bind_template_child (widget_class, IridiumWindow, search_entry);
  gtk_widget_class_bind_template_child (widget_class, IridiumWindow, html_view);
  gtk_widget_class_bind_template_child (widget_class, IridiumWindow, toggle_html_view);
  gtk_widget_class_bind_template_child (widget_class, IridiumWindow, notification_revealer);

  gtk_widget_class_bind_template_callback (widget_class, on_tag_selected);
  gtk_widget_class_bind_template_callback (widget_class, on_note_selected);
  gtk_widget_class_bind_template_callback (widget_class, on_search_changed);
  gtk_widget_class_bind_template_callback (widget_class, on_notification_close_clicked);
}

static void
iridium_window_init (IridiumWindow *self)
{
  GtkSourceLanguageManager *manager;
  GtkStyleProvider *provider;
  GtkSourceBuffer *buffer;
  GSimpleAction *action;
  const gchar *server;
  const gchar *email;
  gchar *password;
  GError *error = NULL;

  gtk_widget_init_template (GTK_WIDGET (self));

  self->title_binding = NULL;
  self->content_binding = NULL;
  self->markdown = iridium_markdown_new ();

  action = g_simple_action_new ("search", NULL);
  g_action_map_add_action (G_ACTION_MAP (self), G_ACTION (action));
  g_signal_connect (action, "activate", G_CALLBACK (search_activated), self);
  g_object_unref (action);

  g_object_bind_property (self->toggle_html_view, "active",
                          self->html_view, "visible", G_BINDING_DEFAULT);
  gtk_search_bar_connect_entry (self->search_bar, GTK_ENTRY (self->search_entry));

  manager = gtk_source_language_manager_get_default ();
  buffer = GTK_SOURCE_BUFFER (gtk_text_view_get_buffer (GTK_TEXT_VIEW (self->source_view)));
  gtk_source_buffer_set_language (buffer, gtk_source_language_manager_get_language (manager, "markdown"));
  g_object_unref (manager);

  provider = GTK_STYLE_PROVIDER (gtk_css_provider_get_default ());
  gtk_css_provider_load_from_resource (GTK_CSS_PROVIDER (provider), "/net/bloerg/Iridium/iridium.css");
  gtk_style_context_add_provider_for_screen (gtk_window_get_screen (GTK_WINDOW (self)), provider, GTK_STYLE_PROVIDER_PRIORITY_USER);

  self->client = iridium_standard_file_new ();
  server = "https://sf.bloerg.net";
  email = "matthias.vogelgesang@gmail.com";

  /* TODO: add dialog */
  password = secret_password_lookup_sync (STANDARD_FILE_SCHEMA, NULL, &error,
      "email", email, "server", server, NULL);

  gtk_revealer_set_reveal_child (self->notification_revealer, TRUE);

  iridium_standard_file_connect_async (self->client, server, email, password, NULL,
      on_standard_file_connected, self);

  secret_password_free (password);

  gtk_list_box_set_filter_func (self->note_list, (GtkListBoxFilterFunc) note_visible, self, NULL);

  gtk_list_box_set_sort_func (self->note_list, (GtkListBoxSortFunc) note_date_cmp, NULL, NULL);

  gtk_widget_show_all (GTK_WIDGET (self->tag_list));
  gtk_widget_show_all (GTK_WIDGET (self->note_list));
}