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// Copyright 2025 Shota FUJI
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
// SPDX-License-Identifier: Apache-2.0

namespace PlacGtkAdwaita {
	namespace ServerSelector {
		[GtkTemplate(ui = "/jp/pocka/plac/gtk-adwaita/ui/server-list.ui")]
		class Window : Adw.ApplicationWindow {
			private enum ScanErrorKind {
				UNEXPECTED_ERROR,
				NETWORK_ERROR,
			}

			[GtkChild]
			private unowned Gtk.ListBox servers_list;

			[GtkChild]
			private unowned Adw.Banner failure_banner;

			[GtkChild]
			private unowned Gtk.Stack stack;

			[GtkChild]
			private unowned Gtk.Button scan_button;

			private ulong error_detail_hid;

			private Plac.V2.ServerScanner scanner = new Plac.V2.ServerScanner();
			private Gee.HashMap<string, ServerRow>rows = new Gee.HashMap<string, ServerRow>();

			public Window(Gtk.Application app) {
				Object(application: app);
			}

			construct {
				scanner.found.connect((server) => {
					stack.visible_child_name = "idle";

					var existing = rows[server.id];
					if (existing == null) {
						var row = new ServerRow(server);

						row.open.connect(() => {
							scanner.stop();

							var window = new MainWindow(
								application,
								new Plac.Discovery.Server(
									row.server.id,
									row.server.name,
									row.server.version,
									row.server.address.to_string(),
									row.server.http_port
								)
							);
							window.start();
							this.close();
						});

						servers_list.append(row);
						rows[server.id] = row;
					} else {
						existing.server = server;
					}
				});

				scanner.scan_failed.connect((error) => {
					show_error(error.message);
				});
			}

			public void start() {
				var scan_action = new SimpleAction("scan_servers", null);
				scan_action.activate.connect(this.scan);
				this.add_action(scan_action);

				this.present();

				this.scan();
			}

			private void scan() {
				failure_banner.revealed = false;
				if (error_detail_hid > 0) {
					failure_banner.disconnect(error_detail_hid);
					error_detail_hid = 0;
				}
				stack.visible_child_name = "loading";
				scan_button.sensitive = false;

				servers_list.remove_all();
				rows.clear();

				scanner.start();
			}

			private void show_error(string message) {
				scan_button.add_css_class("suggested-action");

				error_detail_hid = failure_banner.button_clicked.connect(() => {
					var dialog = new ServerListNetworkErrorDialog(message);
					dialog.present(this);
				});

				failure_banner.revealed = true;
				stack.visible_child_name = "idle";
				scan_button.sensitive = true;
			}
		}

		private class ServerRow : Adw.ActionRow {
			public signal void open();

			private Plac.V2.Server _server;
			public Plac.V2.Server server {
				get { return _server; }
				construct set {
					_server = value;
					this.title = value.name;
					this.subtitle = value.version;
				}
			}

			public ServerRow(Plac.V2.Server server) {
				Object(server: server);
			}

			construct {
				// AdwActionRow needs static widget to be activatable.
				var box = new Gtk.Box(HORIZONTAL, 0);
				this.activatable_widget = box;
				this.activated.connect(() => {
					open();
				});
			}
		}
	}
}