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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 {
[GtkTemplate(ui = "/jp/pocka/plac/gtk-adwaita/ui/playback-toolbar.ui")]
class PlaybackToolbar : Gtk.Box {
	[GtkChild]
	private unowned Gtk.Button play;

	[GtkChild]
	private unowned Gtk.Button pause;

	[GtkChild]
	private unowned Gtk.Popover zone_list_popover;

	[GtkChild]
	private unowned Gtk.ListBox zone_list;

	private Gee.HashMap<string, ZoneSelectorRow>zone_rows = new Gee.HashMap<string, ZoneSelectorRow>();

	private string? zone_id = null;

	public PlaybackToolbar() {
		Object();
	}

	construct {
		zone_list.row_activated.connect((row) => {
				zone_id = ((ZoneSelectorRow) row).zone.id;
				zone_list_popover.popdown();
				this.render();
			});

		this.render();
	}

	public void listen(Plac.Connection conn) {
		conn.zones_changed.connect((event) => {
				foreach (string id in event.removed) {
					GLib.log("Plac", LEVEL_DEBUG, "Zone id=%s removed", id);

					if (zone_rows.has_key(id)) {
						var existing = zone_rows[id];
						zone_rows.unset(id);
						zone_list.remove(existing);
					}
				}

				foreach (Plac.Transport.Zone zone in event.added) {
					GLib.log("Plac", LEVEL_DEBUG, "Zone (%s) id=%s added", zone.name, zone.id);
					if (zone_rows.has_key(zone.id)) {
						var existing = zone_rows[zone.id];
						existing.zone = zone;
						existing.render();
					} else {
						var row = new ZoneSelectorRow(zone);
						zone_rows[zone.id] = row;
						zone_list.append(row);

						if (zone_id == null) {
							zone_id = zone.id;
						}
					}
				}

				foreach (Plac.Transport.Zone zone in event.changed) {
					GLib.log("Plac", LEVEL_DEBUG, "Zone (%s) id=%s changed", zone.name, zone.id);
					if (zone_rows.has_key(zone.id)) {
						var existing = zone_rows[zone.id];
						existing.zone = zone;
						existing.render();
					} else {
						var row = new ZoneSelectorRow(zone);
						zone_rows[zone.id] = row;
						zone_list.append(row);

						if (zone_id == null) {
							zone_id = zone.id;
						}
					}
				}

				// Selected zone has been removed.
				if (zone_id != null && !zone_rows.has_key(zone_id)) {
					zone_id = null;

					foreach (var entry in zone_rows) {
						zone_id = entry.value.zone.id;
						break;
					}
				}

				this.render();
			});
	}

	private void render() {
		var row = zone_rows[zone_id];
		if (row == null) {
			play.visible = true;
			pause.visible = false;
			return;
		}

		switch (row.zone.playback) {
		case LOADING:
		case STOPPED:
		case PAUSED:
			play.visible = true;
			pause.visible = false;
			break;
		case PLAYING:
			play.visible = false;
			pause.visible = true;
			break;
		}
	}
}

class ZoneSelectorRow : Gtk.ListBoxRow {
	private Gtk.Label label;

	public Plac.Transport.Zone zone { get; construct set; }

	public ZoneSelectorRow(Plac.Transport.Zone zone) {
		Object(zone: zone);
	}

	construct {
		label = new Gtk.Label(zone.name);
		this.child = label;
		this.activatable = true;
	}

	public void render() {
		this.label.label = zone.name;
	}
}
}