using Godot;

namespace KeepersCompound.TMV.UI;

public partial class MissionSelector : Control
{
	public event MissionSelectedEventHandler MissionSelected;
	public delegate void MissionSelectedEventHandler(string campaign, string mission);

	private FileDialog _FolderSelect;
	private LineEdit _FolderPath;
	private Button _BrowseButton;
	private ItemList _Campaigns;
	private ItemList _Missions;
	private Button _LoadButton;
	private Button _CancelButton;

	public override void _Ready()
	{
		// TODO: Load initial folderpath from config and prefil everything
		_FolderSelect = GetNode<FileDialog>("%FolderSelect");
		_FolderPath = GetNode<LineEdit>("%FolderPath");
		_BrowseButton = GetNode<Button>("%BrowseButton");
		_Campaigns = GetNode<ItemList>("%Campaigns");
		_Missions = GetNode<ItemList>("%Missions");
		_LoadButton = GetNode<Button>("%LoadButton");
		_CancelButton = GetNode<Button>("%CancelButton");

		_BrowseButton.Pressed += () => _FolderSelect.Visible = true;
		_FolderSelect.DirSelected += SetInstallPath;
		_FolderPath.TextSubmitted += SetInstallPath;
		_Missions.ItemSelected += (long _) => _LoadButton.Disabled = false;
		_Campaigns.ItemSelected += BuildMissionList;
		_LoadButton.Pressed += EmitLoadMission;
		_CancelButton.Pressed += () => Visible = false;
	}

	public override void _Input(InputEvent @event)
	{
		if (@event is InputEventKey keyEvent && keyEvent.Pressed)
		{
			if (keyEvent.Keycode == Key.Escape)
			{
				Visible = !Visible;
			}
		}
	}

	private void SetInstallPath(string path)
	{
		_FolderPath.Text = path;
		if (Context.Instance.PathManager.Init(path))
		{
			BuildCampaignList();
		}
	}

	private void BuildCampaignList()
	{
		_Campaigns.Clear();
		_Missions.Clear();
		_LoadButton.Disabled = true;

		var pathManager = Context.Instance.PathManager;
		_Campaigns.AddItem("Original Missions");
		foreach (var campaign in pathManager.GetCampaignNames())
		{
			_Campaigns.AddItem(campaign);
		}
	}

	private void BuildMissionList(long idx)
	{
		_Missions.Clear();
		_LoadButton.Disabled = true;

		var pathManager = Context.Instance.PathManager;
		var campaignName = _Campaigns.GetItemText((int)idx);
		var missionNames = pathManager.GetMissionNames(idx == 0 ? null : campaignName);
		foreach (var mission in missionNames)
		{
			_Missions.AddItem(mission);
		}
	}

	private void EmitLoadMission()
	{
		var campaignIdxs = _Campaigns.GetSelectedItems();
		var missionIdxs = _Missions.GetSelectedItems();
		if (campaignIdxs.IsEmpty() || missionIdxs.IsEmpty())
		{
			return;
		}

		var campaignIdx = campaignIdxs[0];
		var missionIdx = missionIdxs[0];
		var campaignName = campaignIdx == 0 ? null : _Campaigns.GetItemText(campaignIdx);
		var missionName = _Missions.GetItemText(missionIdx);
		MissionSelected(campaignName, missionName);

		Visible = false;
	}
}