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()
	{
		ClearRobotList();

		foreach (Robot robotObject in GameData.robots)
		{
			robotList.AddChild(CreateRobotDisplay(robotObject));
		}
	}

	private void ClearRobotList()
	{
		foreach (Node node in robotList.GetChildren())
		{
			robotList.RemoveChild(node);
			node.QueueFree();
		}
	}

	private RobotDisplay CreateRobotDisplay(Robot robotObject)
	{
		RobotDisplay display = robotDisplayPrefab.Instantiate<RobotDisplay>();
		display.robot = robotObject;
		display.listItem.Text = robotObject.Name;
		display.OnRobotJumpTo += HandleRobotJumpTo;
		display.OnRobotFollow += HandleRobotFollow;
		return display;
	}

	private void HandleRobotJumpTo(Robot robot)
	{
		EmitSignal(SignalName.OnRobotJumpTo, robot);
		Visible = false;
	}

	private void HandleRobotFollow(Robot robot)
	{
		EmitSignal(SignalName.OnRobotFollow, robot);
		Visible = false;
	}

	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.Position = GameData.map[0].tiles[0, 0].Position;
		robot.robotType = spawnId;
		GetNode("/root/Main/World").AddChild(robot);
		robot.Name = $"Robot #{GameData.robots.Count}";
		GameData.robots.Add(robot);
		spawnId = "";

		ReloadRobots();
		ReloadSelectableRobots();
	}

	public void OnRobotSelect(int index)
	{
		if (index == 0) return;

		spawnId = ItemData.GetIndex(selectableRobots.GetItemText(index));
	}
}