using Godot;

public partial class RobotList : PanelContainer
{
	[Export] VBoxContainer robotList;
	[Export] OptionButton selectableRobots;
	[Export] Button spawnRobot;
	[Signal]
	public delegate void OnRobotJumpToEventHandler(Robot robot);
	[Signal]
	public delegate void OnRobotFollowEventHandler(Robot robot);
	private PackedScene robotDisplayPrefab;
	private string spawnId = "";

	public override void _Ready()
	{
		robotDisplayPrefab = ResourceLoader.LoadRobotDisplay();
	}

	public override void _Notification(int id)
	{
		if (id == NotificationVisibilityChanged)
		{
			if (Visible)
			{
				ReloadRobots();
				ReloadSelectableRobots();
			}
		}
	}

	public void ReloadRobots()
	{
		foreach (Node node in robotList.GetChildren())
		{
			robotList.RemoveChild(node);
			node.QueueFree();
		}
		RobotDisplay display;

		foreach (Robot robotObject in GameData.robots)
		{
			display = robotDisplayPrefab.Instantiate<RobotDisplay>();
			display.robot = robotObject;
			display.listItem.Text = robotObject.Name;
			display.OnRobotJumpTo += (robot) =>
			{
				EmitSignal(SignalName.OnRobotJumpTo, robot);
				Visible = false;
			};
			display.OnRobotFollow += (robot) =>
			{
				EmitSignal(SignalName.OnRobotFollow, robot);
				Visible = false;
			};
			robotList.AddChild(display);
		}
	}

	public void ReloadSelectableRobots()
	{
		selectableRobots.Clear();
		if(GameData.robots.Count >= GameData.maxRobotCount)
		{
			selectableRobots.AddItem("You can't have more robots currently!");
			selectableRobots.Disabled = true;
			spawnRobot.Disabled = true;
			return;
		}
		selectableRobots.Disabled = false;
		spawnRobot.Disabled = false;
		selectableRobots.AddItem("Select robot...");
		foreach (Item item in GameData.inventory.items)
		{
			if (GameData.robotStats.RobotTypes.ContainsKey(item.data.Id))
			{
				selectableRobots.AddItem(item.data.GetReadableName());
			}
		}
	}

	public void SpawnRobot()
	{
		if(spawnId.Length <= 0) return;
		GameData.inventory.RemoveItem(spawnId, 1);
		Robot robot = ResourceLoader.LoadRobotPrefab().Instantiate<Robot>();
		robot.Name = $"Robot #{GameData.robots.Count}";
		robot.Position = GameData.map[0].tiles[0, 0].Position;
		robot.robotType = spawnId;
		GetNode("/root/Main/World").AddChild(robot);
		GameData.robots.Add(robot);
		spawnId = "";

		ReloadRobots();
		ReloadSelectableRobots();
	}

	public void OnRobotSelect(int index)
	{
		//Selected option is the "please select..." option
		if(index == 0) return;
		spawnId = ItemData.GetIndex(selectableRobots.GetItemText(index));
	}
}