using Godot;
using System;
using System.Linq;
using Dictionary = Godot.Collections.Dictionary;
using Array = Godot.Collections.Array;

public class AdaptiveWorldStream : Spatial
{
    // ui elements
    private Label _tileLabel;
    private Label _tileOffsetLabel;
    private Label _numTilesLabel;
    private Label _mouseWorldLabel;
    private Label _mouseTileLabel;

    // scene nodes
    private Spatial _tileHighlight;
    private Spatial _mouseTileHighlight;
    private StreamContainer _streamContainer;
    private Area _streamContainerArea;
    private Spatial _streamContainerActiveTiles;
    private Player _player;
    
    // Resources
    private PackedScene _tileHighlightScene;
    
    // other members
    private HexGrid _hexGrid;
    private HexCell _lastTile;
    private HexCell _currentTile;
    private Vector2 _currentTileOffset;

    // Called when the node enters the scene tree for the first time.
    public override void _Ready()
    {
        // UI elements
        _tileLabel = GetNode<Label>("Control/HBoxContainer/GridContainer/tile_label");
        _tileOffsetLabel = GetNode<Label>("Control/HBoxContainer/GridContainer/tile_offset_label");
        _numTilesLabel = GetNode<Label>("Control/HBoxContainer/GridContainer/num_tiles_label");
        _mouseWorldLabel = GetNode<Label>("Control/HBoxContainer/GridContainer/mouse_world_label");
        _mouseTileLabel = GetNode<Label>("Control/HBoxContainer/GridContainer/mouse_tile_label");

        // scene nodes
        _tileHighlight = GetNode<Spatial>("TileHighlight");
        _mouseTileHighlight = GetNode<Spatial>("MouseTileHighlight");
        _streamContainer = GetNode<StreamContainer>("StreamContainer");
        _streamContainerArea = GetNode<Area>("StreamContainer/Area");
        _streamContainerActiveTiles = GetNode<Spatial>("StreamContainer/ActiveTiles");
        _player = GetNode<Player>("Player");

        // resources        
        _tileHighlightScene = GD.Load<PackedScene>("utils/TileHighlight.tscn");
        
        // other members
        _lastTile = new HexCell();
        _currentTile = new HexCell();
        _currentTileOffset = new Vector2();
        _hexGrid = new HexGrid();

        // connect signals
        var result = _streamContainerArea.Connect("input_event", this, nameof(OnAreaInputEvent));

        // CreateTileGrid();
        
        //playerTransform.origin += new Vector3(0, 0, -1) * delta;
        Transform playerTransform = _player.Transform;
        playerTransform.origin.x = 3;
        _player.Transform = playerTransform;
    }

    public void CreateTileGrid()
    {
        foreach (int x_index in Enumerable.Range(-3, 6))
        {
            foreach (int y_index in Enumerable.Range(0, 1))
            {
                var tile = (Spatial)_tileHighlightScene.Instance();
                HexCell cell = new HexCell();
                Vector2 planeCoords = _hexGrid.GetHexCenterFromOffset(new Vector2(x_index, y_index));
                Transform tileTransform = Transform.Identity;
                tileTransform.origin.x = planeCoords.x;
                tileTransform.origin.z = planeCoords.y;
                tile.Transform = tileTransform;
                AddChild(tile);
                GD.Print("Added tile at offset coords " + new Vector2(x_index, y_index).ToString() +
                         " and world coords " + tileTransform.origin.ToString());
            }
        }
    }


    public void ClearStreamActiveTiles()
    {
        foreach (Node child in _streamContainerActiveTiles.GetChildren())
        {
            child.QueueFree();
            _streamContainerActiveTiles.RemoveChild(child);
        }
    }


    public void CreateStreamActiveTiles()
    {
        foreach (int coord_x in Enumerable.Range((int)_streamContainer.OffsetCoordRect.Position.x, (int)_streamContainer.OffsetCoordRect.Size.x))
        {
            foreach (int coord_y in Enumerable.Range((int)_streamContainer.OffsetCoordRect.Position.y,
                         (int)_streamContainer.OffsetCoordRect.Size.y))
            {
                HexCell cell = new HexCell();
                cell.OffsetCoords = new Vector2(coord_x, coord_y);
                Vector2 cellWorldCenter = _hexGrid.GetHexCenter(cell);
                
                Spatial highlightTile = (Spatial)_tileHighlightScene.Instance();
                Transform highlightTileTransform = Transform.Identity;
                highlightTileTransform.origin.x = cellWorldCenter.x;
                highlightTileTransform.origin.z = cellWorldCenter.y;
                highlightTile.Transform = highlightTileTransform;
                
                _streamContainerActiveTiles.AddChild(highlightTile);
            }
        }
    }
    
    public override void _Process(float delta)
    {
        _lastTile = _currentTile;

        Transform playerTransform = _player.Transform;
        Vector3 playerCoord = playerTransform.origin;
        _currentTile = _hexGrid.GetHexAt(new Vector2(playerCoord.x, playerCoord.z));

        _tileLabel.Text = playerTransform.ToString();
        _tileOffsetLabel.Text = _currentTile.OffsetCoords.ToString();

        playerTransform.origin += new Vector3(-0.2f, 0, 1) * delta;
        _player.Transform = playerTransform;

        Transform tileHighlightTransform = Transform.Identity;
        Vector2 currentTileCenter = _hexGrid.GetHexCenter(_currentTile);
        tileHighlightTransform.origin.x = currentTileCenter.x;
        tileHighlightTransform.origin.z = currentTileCenter.y;
        _tileHighlight.Transform = tileHighlightTransform;

        if (_currentTile.CubeCoords != _lastTile.CubeCoords)
        {
            _streamContainer.SetCenterTile(_currentTile);
            ClearStreamActiveTiles();
            CreateStreamActiveTiles();

            _numTilesLabel.Text = _streamContainerActiveTiles.GetChildCount().ToString();
        }
    }

    public void OnAreaInputEvent(Node camera, InputEvent inputEvent, Vector3 position, Vector3 normal, int shapeIndex)
    {
        HexCell cellAtCursor = _hexGrid.GetHexAt(new Vector2(position.x, position.z));
        Transform highlightTransform = Transform.Identity;
        Vector2 cellPlaneCoords = _hexGrid.GetHexCenter(cellAtCursor);
        cellPlaneCoords = _hexGrid.GetHexCenterFromOffset(cellAtCursor.OffsetCoords);
        highlightTransform.origin.x = cellPlaneCoords.x;
        highlightTransform.origin.z = cellPlaneCoords.y;

        _mouseWorldLabel.Text = position.ToString();
        _mouseTileLabel.Text = cellAtCursor.OffsetCoords.ToString();

        _mouseTileHighlight.Transform = highlightTransform;
        _player.Transform = highlightTransform;
    }
}