/*
 *  pamac-vala
 *
 *  Copyright (C) 2014 Guillaume Benoit <guillaume@manjaro.org>
 *
 *  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 get of the GNU General Public License
 *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

using Gtk;
using Alpm;

const string VERSION = "2.0";

namespace Pamac {

	public struct SortInfo {
		public int column_number;
		public Gtk.SortType sort_type;
	}

	[GtkTemplate (ui = "/org/manjaro/pamac/manager/manager_window.ui")]
	public class ManagerWindow : Gtk.ApplicationWindow {
		// icons
		public Gdk.Pixbuf? installed_icon;
		public Gdk.Pixbuf? uninstalled_icon;
		public Gdk.Pixbuf? to_install_icon;
		public Gdk.Pixbuf? to_reinstall_icon;
		public Gdk.Pixbuf? to_remove_icon;
		public Gdk.Pixbuf? locked_icon;

		// manager objects
		[GtkChild]
		public TreeView packages_treeview;
		[GtkChild]
		public TreeViewColumn state_column;
		[GtkChild]
		public TreeViewColumn name_column;
		[GtkChild]
		public TreeViewColumn version_column;
		[GtkChild]
		public TreeViewColumn repo_column;
		[GtkChild]
		public TreeViewColumn size_column;
		[GtkChild]
		public Notebook filters_notebook;
		[GtkChild]
		public SearchEntry search_entry;
		[GtkChild]
		public TreeView search_treeview;
		[GtkChild]
		public TreeView groups_treeview;
		[GtkChild]
		public TreeView states_treeview;
		[GtkChild]
		public TreeView repos_treeview;
		[GtkChild]
		public TreeView deps_treeview;
		[GtkChild]
		public TreeView details_treeview;
		[GtkChild]
		public ScrolledWindow deps_scrolledwindow;
		[GtkChild]
		public ScrolledWindow details_scrolledwindow;
		[GtkChild]
		public ScrolledWindow files_scrolledwindow;
		[GtkChild]
		public Label name_label;
		[GtkChild]
		public Label desc_label;
		[GtkChild]
		public Label link_label;
		[GtkChild]
		public Label licenses_label;
		[GtkChild]
		public TextView files_textview;
		[GtkChild]
		public Switch search_aur_button;
		[GtkChild]
		public Button valid_button;
		[GtkChild]
		public Button cancel_button;

		public ListStore search_list;
		public ListStore groups_list;
		public ListStore states_list;
		public ListStore repos_list;
		public ListStore deps_list;
		public ListStore details_list;

		PackagesModel packages_list;
		HashTable<string, Json.Array> aur_results;

		public Pamac.Config pamac_config;
		public Transaction transaction;

		public SortInfo sortinfo;

		//dialogs
		HistoryDialog history_dialog;
		PackagesChooserDialog packages_chooser_dialog;
		PreferencesDialog preferences_dialog;

		public ManagerWindow (Gtk.Application application) {
			Object (application: application);

			aur_results = new HashTable<string, Json.Array> (str_hash, str_equal);

			search_list = new Gtk.ListStore (1, typeof (string));
			search_treeview.set_model (search_list);
			groups_list = new Gtk.ListStore (1, typeof (string));
			groups_treeview.set_model (groups_list);
			states_list = new Gtk.ListStore (1, typeof (string));
			states_treeview.set_model (states_list);
			repos_list = new Gtk.ListStore (1, typeof (string));
			repos_treeview.set_model (repos_list);
			deps_list = new Gtk.ListStore (2, typeof (string), typeof (string));
			deps_treeview.set_model (deps_list);
			details_list = new Gtk.ListStore (2, typeof (string), typeof (string));
			details_treeview.set_model (details_list);;

			try {
				installed_icon = new Gdk.Pixbuf.from_resource ("/org/manjaro/pamac/manager/package-installed-updated.png");
				uninstalled_icon = new Gdk.Pixbuf.from_resource ("/org/manjaro/pamac/manager/package-available.png");
				to_install_icon = new Gdk.Pixbuf.from_resource ("/org/manjaro/pamac/manager/package-install.png");
				to_reinstall_icon = new Gdk.Pixbuf.from_resource ("/org/manjaro/pamac/manager/package-reinstall.png");
				to_remove_icon = new Gdk.Pixbuf.from_resource ("/org/manjaro/pamac/manager/package-remove.png");
				locked_icon = new Gdk.Pixbuf.from_resource ("/org/manjaro/pamac/manager/package-installed-locked.png");
			} catch (GLib.Error e) {
				stderr.printf (e.message);
			}

			pamac_config = new Pamac.Config ("/etc/pamac.conf");

			transaction = new Pamac.Transaction (this as ApplicationWindow, pamac_config);
			transaction.finished.connect (on_emit_trans_finished);

			history_dialog = new HistoryDialog (this);
			packages_chooser_dialog = new PackagesChooserDialog (this, transaction);
			preferences_dialog = new PreferencesDialog (this as ApplicationWindow);

			set_buttons_sensitive (false);
			search_aur_button.set_active (pamac_config.enable_aur);

			// sort by name by default
			sortinfo = {0, SortType.ASCENDING};
			update_lists ();
		}

		public void enable_aur (bool enable) {
			search_aur_button.set_active (enable);
		}

		public void set_buttons_sensitive (bool sensitive) {
			valid_button.set_sensitive (sensitive);
			cancel_button.set_sensitive (sensitive);
		}

		public void update_lists () {
			Alpm.List <string?> grps = null;
			TreeIter iter;
			foreach (unowned DB db in transaction.alpm_config.handle.syncdbs) {
				repos_list.insert_with_values (out iter, -1, 0, db.name);
				foreach (unowned Group grp in db.groupcache) {
					if (grps.find_str (grp.name) == null)
						grps.add(grp.name);
				}
			}
			repos_list.insert_with_values (out iter, -1, 0, dgettext (null, "local"));
			foreach (string name in grps)
				groups_list.insert_with_values (out iter, -1, 0, name);
			groups_list.set_sort_column_id (0, SortType.ASCENDING);
			states_list.insert_with_values (out iter, -1, 0, dgettext (null, "Installed"));
			//states_list.insert_with_values (out iter, -1, 0, dgettext (null, "Uninstalled"));
			states_list.insert_with_values (out iter, -1, 0, dgettext (null, "Orphans"));
			states_list.insert_with_values (out iter, -1, 0, dgettext (null, "To install"));
			states_list.insert_with_values (out iter, -1, 0, dgettext (null, "To remove"));
		}

		public void set_infos_list (Pamac.Package pkg) {
			name_label.set_markup ("<big><b>%s  %s</b></big>".printf (pkg.name, pkg.version));
			// fix &,-,>,< in desc
			string desc;
			if (pkg.alpm_pkg != null)
				desc = pkg.alpm_pkg.desc;
			else
				desc = pkg.aur_json.get_string_member ("Description");
			desc = desc.replace ("&", "&amp;");
			desc = desc.replace ("<->", "/");
			desc_label.set_markup (desc);
			// fix & in url
			string url;
			if (pkg.alpm_pkg != null)
				url = pkg.alpm_pkg.url;
			else
				url = pkg.aur_json.get_string_member ("URL");
			url = url.replace ("&", "&amp;");
			link_label.set_markup ("<a href=\"%s\">%s</a>".printf (url, url));
			StringBuilder licenses = new StringBuilder ();
			licenses.append (dgettext (null, "Licenses"));
			licenses.append (":");
			if (pkg.alpm_pkg != null) {
				foreach (unowned string license in pkg.alpm_pkg.licenses) {
					licenses.append (" ");
					licenses.append (license);
				}
			} else {
				licenses.append (" ");
				licenses.append (pkg.aur_json.get_string_member ("License"));
			}
			licenses_label.set_markup (licenses.str);
		}

		public void set_deps_list (Alpm.Package pkg) {
			deps_list.clear ();
			TreeIter iter;
			unowned Alpm.List<Depend?> list = pkg.depends;
			size_t len = list.length;
			size_t i;
			if (len != 0) {
				deps_list.insert_with_values (out iter, -1,
												0, dgettext (null, "Depends On") + ":",
												1, list.nth (0).get_data ().compute_string ());
				i = 1;
				while (i < len) {
					deps_list.insert_with_values (out iter, -1,
												1, list.nth (i).get_data ().compute_string ());
					i++;
				}
			}
			list = pkg.optdepends;
			len = list.length;
			if (len != 0) {
				unowned Depend optdep = list.nth (0).get_data ();
				unowned Alpm.Package? satisfier = find_satisfier (
											transaction.alpm_config.handle.localdb.pkgcache,
											optdep.name);
				string optdep_str = optdep.compute_string ();
				if (satisfier != null)
					optdep_str = optdep_str + " [" + dgettext (null, "Installed") + "]";
				deps_list.insert_with_values (out iter, -1,
												0, dgettext (null, "Optional Deps") + ":",
												1, optdep_str);
				i = 1;
				while (i < len) {
					optdep = list.nth (i).get_data ();
					satisfier = find_satisfier (
											transaction.alpm_config.handle.localdb.pkgcache,
											optdep.name);
					optdep_str = optdep.compute_string ();
					if (satisfier != null)
						optdep_str = optdep_str + " [" + dgettext (null, "Installed") + "]";
					deps_list.insert_with_values (out iter, -1, 1, optdep_str);
					i++;
				}
			}
			if (pkg.origin == PkgFrom.LOCALDB) {
				unowned Alpm.List<string?> str_list = pkg.compute_requiredby ();
				len = str_list.length;
				if (len != 0) {
					deps_list.insert_with_values (out iter, -1,
													0, dgettext (null, "Required By") + ":",
													1, str_list.nth (0).get_data ());
					i = 1;
					while (i < len) {
						deps_list.insert_with_values (out iter, -1,
													1, str_list.nth (i).get_data ());
						i++;
					}
				}
			}
			list = pkg.provides;
			len = list.length;
			if (len != 0) {
				deps_list.insert_with_values (out iter, -1,
												0, dgettext (null, "Provides") + ":",
												1, list.nth (0).get_data ().compute_string ());
				i = 1;
				while (i < len) {
					deps_list.insert_with_values (out iter, -1,
												1, list.nth (i).get_data ().compute_string ());
					i++;
				}
			}
			list = pkg.replaces;
			len = list.length;
			if (len != 0) {
				deps_list.insert_with_values (out iter, -1,
												0, dgettext (null, "Replaces") + ":",
												1, list.nth (0).get_data ().compute_string ());
				i = 1;
				while (i < len) {
					deps_list.insert_with_values (out iter, -1,
												1, list.nth (i).get_data ().compute_string ());
					i++;
				}
			}
			list = pkg.conflicts;
			len = list.length;
			if (len != 0) {
				deps_list.insert_with_values (out iter, -1,
												0, dgettext (null, "Conflicts With") + ":",
												1, list.nth (0).get_data ().compute_string ());
				i = 1;
				while (i < len) {
					deps_list.insert_with_values (out iter, -1,
												1, list.nth (i).get_data ().compute_string ());
					i++;
				}
			}
		}

		public void set_details_list (Alpm.Package pkg) {
			details_list.clear ();
			TreeIter iter;
			if (pkg.origin == PkgFrom.SYNCDB) {
				details_list.insert_with_values (out iter, -1,
													0, dgettext (null, "Repository") + ":",
													1, pkg.db.name);
			}
			unowned Alpm.List<string?> list = pkg.groups;
			size_t len = list.length;
			size_t i;
			if (len != 0) {
				details_list.insert_with_values (out iter, -1,
												0, dgettext (null, "Groups") + ":",
												1, list.nth (0).get_data ());
				i = 1;
				while (i < len) {
					details_list.insert_with_values (out iter, -1,
												1, list.nth (i).get_data ());
					i++;
				}
			}
			details_list.insert_with_values (out iter, -1,
													0, dgettext (null, "Packager") + ":",
													1, pkg.packager);
			if (pkg.origin == PkgFrom.LOCALDB) {
				GLib.Time time = GLib.Time.local ((time_t) pkg.installdate);
				string strtime = time.format ("%a %d %b %Y %X %Z");
				details_list.insert_with_values (out iter, -1,
													0, dgettext (null, "Install Date") + ":",
													1, strtime);
				string reason;
				if (pkg.reason == PkgReason.EXPLICIT)
					reason = dgettext (null, "Explicitly installed");
				else if (pkg.reason == PkgReason.EXPLICIT)
					reason = dgettext (null, "Installed as a dependency for another package");
				else
					reason = dgettext (null, "Unknown");
				details_list.insert_with_values (out iter, -1,
													0, dgettext (null, "Install Reason") + ":",
													1, reason);
			}
			if (pkg.origin == PkgFrom.SYNCDB) {
				details_list.insert_with_values (out iter, -1,
													0, dgettext (null, "Signatures") + ":",
													1, pkg.base64_sig != null ? "Yes" : "No");
			}
			if (pkg.origin == PkgFrom.LOCALDB) {
				unowned Alpm.List<Backup?> backup_list = pkg.backup;
				len = backup_list.length;
				if (len != 0) {
					details_list.insert_with_values (out iter, -1,
													0, dgettext (null, "Backup files") + ":",
													1, "/" + backup_list.nth (0).get_data ().name);
					i = 1;
					while (i < len) {
						details_list.insert_with_values (out iter, -1,
													1, "/" + backup_list.nth (i).get_data ().name);
						i++;
					}
				}
			}
		}

		public void set_files_list (Alpm.Package pkg) {
			StringBuilder text = new StringBuilder (); 
			foreach (unowned Alpm.File file in pkg.files) {
				if (text.len != 0)
					text.append ("\n");
				text.append ("/");
				text.append (file.name);
			}
			files_textview.buffer.set_text (text.str, (int) text.len);
		}

		public async unowned Alpm.List<Alpm.Package?> search_pkgs (string search_string, out Json.Array aur_pkgs) {
			unowned Alpm.List<Alpm.Package?> pkgs = null;
			unowned Alpm.List<string?> needles = null;
			string[] splitted = search_string.split (" ");
			foreach (unowned string part in splitted)
				needles.add (part);
			pkgs = search_all_dbs (transaction.alpm_config.handle, needles);
			if (search_aur_button.get_active()) {
				if (aur_results.contains (search_string)) {
					aur_pkgs = aur_results.get (search_string);
				} else {
					aur_pkgs = AUR.search (search_string);
					aur_results.insert (search_string, aur_pkgs);
				}
			} else {
				aur_pkgs = new Json.Array ();
			}
			return pkgs;
		}

		public void populate_packages_list (Alpm.List<Alpm.Package?>? pkgs, Json.Array? aur_pkgs = null) {
			packages_treeview.freeze_child_notify ();
			packages_treeview.set_model (null);

			// populate liststore
			packages_list = new PackagesModel (pkgs, aur_pkgs, this);

			// sort liststore
			int column = sortinfo.column_number;
			if (column == 0)
				packages_list.sort_by_name (sortinfo.sort_type);
			else if (column == 1)
				packages_list.sort_by_state (sortinfo.sort_type);
			else if (column == 2)
				packages_list.sort_by_version (sortinfo.sort_type);
			else if (column == 3)
				packages_list.sort_by_repo (sortinfo.sort_type);
			else if (column == 4)
				packages_list.sort_by_size (sortinfo.sort_type);

			packages_treeview.set_model (packages_list);
			packages_treeview.thaw_child_notify ();

			this.get_window ().set_cursor (null);
		}

		public void refresh_packages_list () {
			int current_page = filters_notebook.get_current_page ();
			if (current_page == 0) {
				TreeModel model;
				TreeIter? iter;
				TreeSelection selection = search_treeview.get_selection ();
				if (selection.get_selected (out model, out iter)) {
					on_search_treeview_selection_changed ();
				}
			} else if (current_page == 1) {
				on_groups_treeview_selection_changed ();
			} else if (current_page == 2) {
				on_states_treeview_selection_changed ();
			} else if (current_page == 3) {
				on_repos_treeview_selection_changed ();
			}
		}

		[GtkCallback]
		public void on_packages_treeview_selection_changed () {
			TreeModel model;
			TreeIter? iter;
			TreeSelection selection = packages_treeview.get_selection ();
			if (selection.get_selected (out model, out iter)) {
				Pamac.Package pkg = (Pamac.Package) iter.user_data;
				if (pkg.alpm_pkg != null) {
					set_infos_list (pkg);
					set_deps_list (pkg.alpm_pkg);
					set_details_list (pkg.alpm_pkg);
					deps_scrolledwindow.visible = true;
					details_scrolledwindow.visible =  true;
					if (pkg.alpm_pkg.origin == PkgFrom.LOCALDB) {
						set_files_list (pkg.alpm_pkg);
						files_scrolledwindow.visible = true;
					} else {
						files_scrolledwindow.visible = false;
					}
				} else if (pkg.aur_json != null) {
					set_infos_list (pkg);
					deps_scrolledwindow.visible = false;
					details_scrolledwindow.visible = false;
					files_scrolledwindow.visible = false;
				}
			}
		}

		[GtkCallback]
		public void on_packages_treeview_row_activated (TreeView treeview, TreePath path, TreeViewColumn column) {
			TreeIter iter;
			if (packages_list.get_iter (out iter, path)) {
				GLib.Value val;
				packages_list.get_value (iter, 0, out val);
				string name = val.get_string ();
				if (name != dgettext (null, "No package found")) {
					if (transaction.data.to_add.contains (name)) {
						transaction.data.to_add.steal (name);
					} else if (transaction.data.to_remove.contains (name)) {
						transaction.data.to_remove.steal (name);
					} else if (transaction.data.to_build.contains (name)) {
						transaction.data.to_build.steal (name);
					} else {
						packages_list.get_value (iter, 3, out val);
						string db_name = val.get_string ();
						if (db_name == "local") {
							if (!(name in transaction.alpm_config.holdpkg)) {
								transaction.data.to_remove.insert (name, name);
							}
						} else if (db_name == "AUR") {
							transaction.data.to_build.insert (name, name);
						} else {
							transaction.data.to_add.insert (name, name);
						}
					}
				}
			}
			if (transaction.data.to_add.size () + transaction.data.to_remove.size () + transaction.data.to_build.size () == 0) {
				set_buttons_sensitive (false);
			} else {
				set_buttons_sensitive (true);
			}
			// force a display refresh
			packages_treeview.queue_draw ();
		}

		[GtkCallback]
		public bool on_list_treeview_button_press_event (Gdk.EventButton event) {
			// to do
			return false;
		}

		[GtkCallback]
		public void on_name_column_clicked () {
			SortType new_order;
			if (name_column.sort_indicator == false)
				new_order = SortType.ASCENDING;
			else {
				if (sortinfo.sort_type == SortType.ASCENDING)
					new_order =  SortType.DESCENDING;
				else
					new_order =  SortType.ASCENDING;
			}
			packages_list.sort_by_name (new_order);
			// force a display refresh
			packages_treeview.queue_draw ();
		}

		[GtkCallback]
		public void on_state_column_clicked () {
			SortType new_order;
			if (state_column.sort_indicator == false)
				new_order = SortType.ASCENDING;
			else {
				if (sortinfo.sort_type == SortType.ASCENDING)
					new_order =  SortType.DESCENDING;
				else
					new_order =  SortType.ASCENDING;
			}
			packages_list.sort_by_state (new_order);
			// force a display refresh
			packages_treeview.queue_draw ();
		}

		[GtkCallback]
		public void on_version_column_clicked () {
			SortType new_order;
			if (version_column.sort_indicator == false)
				new_order = SortType.ASCENDING;
			else {
				if (sortinfo.sort_type == SortType.ASCENDING)
					new_order =  SortType.DESCENDING;
				else
					new_order =  SortType.ASCENDING;
			}
			packages_list.sort_by_version (new_order);
			// force a display refresh
			packages_treeview.queue_draw ();
		}

		[GtkCallback]
		public void on_repo_column_clicked () {
			SortType new_order;
			if (repo_column.sort_indicator == false)
				new_order = SortType.ASCENDING;
			else {
				if (sortinfo.sort_type == SortType.ASCENDING)
					new_order =  SortType.DESCENDING;
				else
					new_order =  SortType.ASCENDING;
			}
			packages_list.sort_by_repo (new_order);
			// force a display refresh
			packages_treeview.queue_draw ();
		}

		[GtkCallback]
		public void on_size_column_clicked () {
			SortType new_order;
			if (size_column.sort_indicator == false)
				new_order = SortType.ASCENDING;
			else {
				if (sortinfo.sort_type == SortType.ASCENDING)
					new_order =  SortType.DESCENDING;
				else
					new_order =  SortType.ASCENDING;
			}
			packages_list.sort_by_size (new_order);
			// force a display refresh
			packages_treeview.queue_draw ();
		}

		[GtkCallback]
		public void on_search_entry_activate () {
			string search_string = search_entry.get_text ();
			if (search_string != "") {
				this.get_window ().set_cursor (new Gdk.Cursor (Gdk.CursorType.WATCH));
				while (Gtk.events_pending ())
					Gtk.main_iteration ();
				search_pkgs.begin (search_string, (obj, res) => {
					Json.Array aur_pkgs;
					unowned Alpm.List<Alpm.Package?> pkgs = search_pkgs.end (res, out aur_pkgs);
					if (pkgs.length != 0) {
						// add search string in search_list if needed
						bool found = false;
						TreeIter? iter;
						TreeModel model;
						TreeSelection selection = search_treeview.get_selection ();
						// check if search string is already selected in search list
						if (selection.get_selected (out model, out iter)) {
							GLib.Value val;
							model.get_value (iter, 0, out val);
							string selected_string = val.get_string ();
							if (selected_string == search_string) {
								found = true;
								// we need to populate packages_list
								populate_packages_list (pkgs, aur_pkgs);
							} else {
								search_list.foreach ((_model, _path, _iter) => {
									GLib.Value line;
									model.get_value (_iter, 0, out line);
									if ((string) line == search_string) {
										found = true;
										// populate will be done because we select the iter in search_list
										selection.select_iter (_iter);
									}
									return found;
								});
							}
						}
						if (!found) {
							search_list.insert_with_values (out iter, -1, 0, search_string);
							// populate will be done because we select the iter in search_list
							selection.select_iter (iter);
						}
					} else
						// populate with empty lists
						populate_packages_list (pkgs, aur_pkgs);
					});
			}
		}

		[GtkCallback]
		public void  on_search_entry_icon_press (EntryIconPosition p0, Gdk.Event? p1) {
			on_search_entry_activate ();
		}

		[GtkCallback]
		public void on_search_treeview_selection_changed () {
			TreeModel model;
			TreeIter? iter;
			TreeSelection selection = search_treeview.get_selection ();
			if (selection.get_selected (out model, out iter)) {
				this.get_window ().set_cursor (new Gdk.Cursor (Gdk.CursorType.WATCH));
				while (Gtk.events_pending ())
					Gtk.main_iteration ();
				GLib.Value val;
				model.get_value (iter, 0, out val);
				string search_string = val.get_string ();
				search_pkgs.begin (search_string, (obj, res) => {
					Json.Array aur_pkgs;
					unowned Alpm.List<Alpm.Package?> pkgs = search_pkgs.end (res, out aur_pkgs);
					populate_packages_list (pkgs, aur_pkgs);
					});
			}
		}

		[GtkCallback]
		public void on_groups_treeview_selection_changed () {
			TreeModel model;
			TreeIter? iter;
			TreeSelection selection = groups_treeview.get_selection ();
			if (selection.get_selected (out model, out iter)) {
				this.get_window ().set_cursor (new Gdk.Cursor (Gdk.CursorType.WATCH));
				while (Gtk.events_pending ())
					Gtk.main_iteration ();
				GLib.Value val;
				model.get_value (iter, 0, out val);
				string grp_name = val.get_string ();
				unowned Alpm.List<Alpm.Package?> pkgs = group_pkgs_all_dbs (transaction.alpm_config.handle, grp_name);
				populate_packages_list (pkgs);
			}
		}

		[GtkCallback]
		public void on_states_treeview_selection_changed () {
			TreeModel model;
			TreeIter? iter;
			TreeSelection selection = states_treeview.get_selection ();
			if (selection.get_selected (out model, out iter)) {
				this.get_window ().set_cursor (new Gdk.Cursor (Gdk.CursorType.WATCH));
				while (Gtk.events_pending ())
					Gtk.main_iteration ();
				GLib.Value val;
				model.get_value (iter, 0, out val);
				string state = val.get_string ();
				unowned Alpm.List<Alpm.Package?> pkgs = null;
				unowned Alpm.Package? find_pkg = null;
				if (state == dgettext (null, "To install")) {
					foreach (string name in transaction.data.to_add.get_keys ()) {
						find_pkg = transaction.alpm_config.handle.localdb.get_pkg (name);
						if (find_pkg != null)
							pkgs.add (find_pkg);
						else {
							find_pkg = get_syncpkg (transaction.alpm_config.handle, name);
							if (find_pkg != null)
								pkgs.add (find_pkg);
						}
					}
				} else if (state == dgettext (null, "To remove")) {
					foreach (string name in transaction.data.to_remove.get_keys ()) {
						find_pkg = transaction.alpm_config.handle.localdb.get_pkg (name);
						if (find_pkg != null)
							pkgs.add (find_pkg);
					}
				} else if (state == dgettext (null, "Installed")) {
					pkgs = transaction.alpm_config.handle.localdb.pkgcache;
				} else if (state == dgettext (null, "Uninstalled")) {
					unowned Alpm.List<Alpm.Package?> tmp = null;
					unowned Alpm.List<Alpm.Package?> diff = null;
					foreach (unowned DB db in transaction.alpm_config.handle.syncdbs) {
						if (pkgs.length == 0)
							pkgs = db.pkgcache;
						else {
							tmp = db.pkgcache;
							diff = tmp.diff (pkgs, (Alpm.List.CompareFunc) pkgcmp);
							pkgs.join (diff);
						}
					}
				} else if (state == dgettext (null, "Orphans")) {
					foreach (unowned Alpm.Package pkg in transaction.alpm_config.handle.localdb.pkgcache) {
						if (pkg.reason == PkgReason.DEPEND) {
							if (pkg.compute_requiredby().length == 0)
								pkgs.add (pkg);
						}
					}
				}
			populate_packages_list (pkgs);
			}
		}

		[GtkCallback]
		public void on_repos_treeview_selection_changed () {
			TreeModel model;
			TreeIter? iter;
			TreeSelection selection = repos_treeview.get_selection ();
			if (selection.get_selected (out model, out iter)) {
				this.get_window ().set_cursor (new Gdk.Cursor (Gdk.CursorType.WATCH));
				while (Gtk.events_pending ())
					Gtk.main_iteration ();
				GLib.Value val;
				model.get_value (iter, 0, out val);
				string repo = val.get_string ();
				unowned Alpm.List<Alpm.Package?> pkgs = null;
				unowned Alpm.Package? find_pkg = null;
				if (repo == dgettext (null, "local")) {
					foreach (unowned Alpm.Package pkg in transaction.alpm_config.handle.localdb.pkgcache) {
						find_pkg = get_syncpkg (transaction.alpm_config.handle, pkg.name);
						if (find_pkg == null)
							pkgs.add (pkg);
					}
				} else {
					foreach (unowned DB db in transaction.alpm_config.handle.syncdbs) {
						if (db.name == repo) {
							foreach (unowned Alpm.Package pkg in db.pkgcache) {
								find_pkg = transaction.alpm_config.handle.localdb.get_pkg (pkg.name);
								if (find_pkg != null)
									pkgs.add (find_pkg);
								else
									pkgs.add (pkg);
							}
						}
					}
				}
				populate_packages_list (pkgs);
			}
		}

		[GtkCallback]
		public void on_filters_notebook_switch_page (Widget page, uint page_num) {
			refresh_packages_list ();
		}

		[GtkCallback]
		public void  on_history_item_activate () {
			var file = GLib.File.new_for_path ("/var/log/pamac.log");
			if (!file.query_exists ())
				GLib.stderr.printf ("File '%s' doesn't exist.\n", file.get_path ());
			else {
				StringBuilder text = new StringBuilder ();
				try {
					// Open file for reading and wrap returned FileInputStream into a
					// DataInputStream, so we can read line by line
					var dis = new DataInputStream (file.read ());
					string line;
					// Read lines until end of file (null) is reached
					while ((line = dis.read_line (null)) != null) {
						text.append (line);
						text.append ("\n");
					}
				} catch (GLib.Error e) {
					GLib.stderr.printf("%s\n", e.message);
				}
				history_dialog.textview.buffer.set_text (text.str, (int) text.len);
				history_dialog.run ();
				history_dialog.hide ();
			}
		}

		[GtkCallback]
		public void on_local_item_activate () {
			int response = packages_chooser_dialog.run ();
			if (response== ResponseType.ACCEPT) {
				SList<string> packages_paths = packages_chooser_dialog.get_filenames ();
				if (packages_paths.length () != 0) {
					foreach (string path in packages_paths) {
						transaction.data.to_load.insert (path, path);
					}
					this.get_window ().set_cursor (new Gdk.Cursor (Gdk.CursorType.WATCH));
					packages_chooser_dialog.hide ();
					while (Gtk.events_pending ())
						Gtk.main_iteration ();
					transaction.run ();
				}
			} else
				packages_chooser_dialog.hide ();
		}

		[GtkCallback]
		public void on_preferences_item_activate () {
			bool enable_aur = pamac_config.enable_aur;
			bool recurse = pamac_config.recurse;
			uint64 refresh_period = pamac_config.refresh_period;
			preferences_dialog.enable_aur_button.set_active (enable_aur);
			preferences_dialog.remove_unrequired_deps_button.set_active (recurse);
			preferences_dialog.refresh_period_spin_button.set_value (refresh_period);
			int response = preferences_dialog.run ();
			while (Gtk.events_pending ())
				Gtk.main_iteration ();
			if (response == ResponseType.OK) {
				HashTable<string,string> new_conf = new HashTable<string,string> (str_hash, str_equal);
				enable_aur = preferences_dialog.enable_aur_button.get_active ();
				recurse = preferences_dialog.remove_unrequired_deps_button.get_active ();
				refresh_period = (uint64) preferences_dialog.refresh_period_spin_button.get_value ();
				if (enable_aur != pamac_config.enable_aur) {
					search_aur_button.set_active (enable_aur);
					new_conf.insert ("EnableAUR", enable_aur.to_string ());
				}
				if (recurse != pamac_config.recurse)
					new_conf.insert ("RemoveUnrequiredDeps", recurse.to_string ());
				if (refresh_period != pamac_config.refresh_period)
					new_conf.insert ("RefreshPeriod", refresh_period.to_string ());
				if (new_conf.size () != 0) {
					transaction.write_config (new_conf);
					pamac_config.reload ();
				}
			}
			preferences_dialog.hide ();
		}

		[GtkCallback]
		public void on_about_item_activate () {
			Gtk.show_about_dialog (
				this,
				"program_name", "Pamac",
				"logo_icon_name", "system-software-install",
				"comments", "A GTK3 frontend of libalpm",
				"copyright", "Copyright © 2014 Guillaume Benoit",
				"version", VERSION,
				"license_type", License.GPL_3_0,
				"website", "http://manjaro.org");
		}

		[GtkCallback]
		public void on_valid_button_clicked () {
			this.get_window ().set_cursor (new Gdk.Cursor (Gdk.CursorType.WATCH));
			while (Gtk.events_pending ())
				Gtk.main_iteration ();
			if (pamac_config.recurse)
				transaction.data.flags |= Alpm.TransFlag.RECURSE;
			transaction.run ();
		}

		[GtkCallback]
		public void on_cancel_button_clicked () {
			transaction.clear_lists ();
			set_buttons_sensitive (false);
			// force a display refresh
			packages_treeview.queue_draw ();
		}

		[GtkCallback]
		public void on_refresh_button_clicked () {
			transaction.refresh (0);
		}

		public void on_emit_trans_finished (bool error) {
			if (error == false) {
				set_buttons_sensitive (false);
				refresh_packages_list ();
			}
			transaction.data.to_load.steal_all ();
			this.get_window ().set_cursor (null);
		}
	}
}