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

public class Game : Spatial
{
    // ui elements
    private Label _framesPerSecondLabel;
    private Label _tileLabel;
    private Label _tileOffsetLabel;
    private Label _numTilesLabel;
    private Label _mouseWorldLabel;
    private Label _mouseTileLabel;
    private Label _numCoordsAddedLabel;
    private Label _numCoordsRemovedLabel;
    private TextureRect _worldTextureRect;

    // scene nodes
    private Spatial _tileHighlight;
    private Spatial _mouseTileHighlight;
    private StreamContainer _streamContainer;
    private Area _streamContainerArea;
    private Spatial _streamContainerActiveTiles;
    private Player _player;
    private Chest _chest;
    private TileWorld _tileWorld;

    // 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
        _framesPerSecondLabel = GetNode<Label>("Control/HBoxContainer/GridContainer/fps_label");
        _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");
        _numCoordsAddedLabel = GetNode<Label>("Control/HBoxContainer/GridContainer/num_coords_added_label");
        _numCoordsRemovedLabel = GetNode<Label>("Control/HBoxContainer/GridContainer/num_coords_removed_label");
        _worldTextureRect = GetNode<TextureRect>("Control/WorldTextureRect");

        // 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");
        _chest = GetNode<Chest>("Entities/Chest");
        _tileWorld = GetNode<TileWorld>("TileWorld");

        Debug.Assert(_tileWorld != null);

        // resources        
        _tileHighlightScene = GD.Load<PackedScene>("utils/TileHighlight.tscn");

        // other members
        _lastTile = new HexCell();
        _currentTile = new HexCell();
        _currentTileOffset = new Vector2();
        _hexGrid = new HexGrid();

        // update data
        _worldTextureRect.RectSize = _tileWorld.Size;
        
        // connect signals
        _streamContainerArea.Connect("input_event", this, nameof(OnAreaInputEvent));
        _streamContainer.Connect("TileClicked", this, nameof(OnTileClicked));
        _tileWorld.Connect("WorldGenerated", this, nameof(OnWorldGenerated));
        
        // register entity events
        Array entityNodes = FindNode("Entities").GetChildren();
        foreach (Node node in entityNodes)
        {
            if (node is Chest)
            {
                node.Connect("EntityClicked", this, nameof(OnEntityClicked));
            }
        }
        
        // perform dependency injection
        //_streamContainer.SetWorld(_tileWorld);
        WorldInfoComponent worldInfoComponent = _player.GetNode<WorldInfoComponent>("WorldInfo");
        if (worldInfoComponent != null)
        {
            worldInfoComponent.SetWorld(_tileWorld);
        }
        
        _tileWorld.Generate();
        UpdateCurrentTile();
        _streamContainer.SetCenterTile(_currentTile);
    }

    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 UpdateCurrentTile()
    {
        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();

        _player.Transform = playerTransform;
    }


    public override void _Process(float delta)
    {
        _framesPerSecondLabel.Text = Engine.GetFramesPerSecond().ToString();
        _lastTile = _currentTile;

        UpdateCurrentTile();

        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);

            _numTilesLabel.Text = _streamContainerActiveTiles.GetChildCount().ToString();
            _numCoordsAddedLabel.Text = _streamContainer.AddedCoords.Count.ToString();
            _numCoordsRemovedLabel.Text = _streamContainer.RemovedCoords.Count.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;

        if (inputEvent is InputEventMouseButton && ((InputEventMouseButton) inputEvent).Pressed)
        {
            _streamContainer.EmitSignal("TileClicked", _streamContainer.GetTile3dAt(cellAtCursor.OffsetCoords));
        }
    }


    public void OnTileClicked(HexTile3D tile)
    {
        if (_player == null)
        {
            return;
        }

        if (_player.Navigation == null)
        {
            return;
        }
        
        _player.Navigation.Plan(_player.GlobalTranslation, tile.GlobalTranslation); 
    }


    public void OnEntityClicked(Entity entity)
    {
        GD.Print("Clicked on entity at " + entity.GlobalTranslation);

        Spatial mountPoint = (Spatial)entity.FindNode("MountPoint");
        if (mountPoint != null)
        {
            GD.Print("Mount point!");
            _player.Navigation.Plan(_player.GlobalTranslation, mountPoint.GlobalTranslation, mountPoint.GlobalTransform.basis.Quat()); 
        }
    }


    public void OnWorldGenerated()
    {
        GD.Print("Using new map");
        ImageTexture new_world_texture = new ImageTexture();
        
        _tileWorld.Heightmap.Unlock();
        new_world_texture.CreateFromImage(_tileWorld.Heightmap);
        _tileWorld.Heightmap.Lock();

        _worldTextureRect.Texture = new_world_texture;
    }
}