using Godot;
using System;
using System.Collections.Generic;
using System.Linq;

public class Player : Entity
{
    // public members
    public Vector3 TargetPosition = Vector3.Zero;

    public TaskQueueComponent TaskQueueComponent;
    
    public NavigationComponent Navigation
    {
        get { return _navigationComponent; }
    }

    // private members
    private MovableComponent _movable;
    private Spatial _geometry;
    private WorldInfoComponent _worldInfo;
    private GroundMotionComponent _groundMotion;
    private NavigationComponent _navigationComponent;
    private Area _itemAttractorArea;
    private Area _itemPickupArea;
    private List<Node> _attractedItemList = new List<Node>();

    // Called when the node enters the scene tree for the first time.
    public override void _Ready()
    {
        _groundMotion = new GroundMotionComponent();
        _worldInfo = (WorldInfoComponent)FindNode("WorldInfo", false);
        _navigationComponent = (NavigationComponent)FindNode("Navigation", false);
        _navigationComponent.TileWorld = _worldInfo.TileWorld;
        TaskQueueComponent = new TaskQueueComponent();
        _geometry = (Spatial)FindNode("Geometry", false);
        
        _itemAttractorArea = (Area)FindNode("ItemAttractorArea", false);
        if (_itemAttractorArea == null)
        {
            GD.PushWarning("No ItemAttractorArea node found for " + this.GetClass());
        }
        else
        {
            _itemAttractorArea.Connect("body_entered", this, nameof(OnItemAttractorBodyEntered));
            _itemAttractorArea.Connect("body_exited", this, nameof(OnItemAttractorBodyExited));
        }
        
        _itemPickupArea = (Area)FindNode("ItemPickupArea", false);
        if (_itemPickupArea == null)
        {
            GD.PushWarning("No ItemPickupArea node found for " + this.GetClass());
        }
        else
        {
            _itemPickupArea.Connect("body_entered", this, nameof(OnItemPickupAreaBodyEntered));
        }

    }


    public override void _PhysicsProcess(float delta)
    {
        base._PhysicsProcess(delta);

        if (_navigationComponent == null)
        {
            return;
        }
        
        if (TaskQueueComponent != null && TaskQueueComponent.Queue.Count > 0)
        {
            TaskQueueComponent.Process(this, delta);

            if (TaskQueueComponent.Queue.Count > 0)
            {
                var currentTask = TaskQueueComponent.Queue.Peek();
                if (currentTask is TaskQueueComponent.NavigationTask)
                {
                    TaskQueueComponent.NavigationTask navigationTask = (TaskQueueComponent.NavigationTask)currentTask;
                    _navigationComponent.Plan(GlobalTransform, navigationTask.NavigationPoint);
                }
            }
        }
        
        _navigationComponent.UpdateCurrentGoal(GlobalTransform);
        _groundMotion.PhysicsProcess(delta, this, _navigationComponent.CurrentGoalPositionWorld, _navigationComponent.CurrentGoalOrientationWorld, _worldInfo.TileWorld);
    }


    public override void _Process(float delta)
    {
        if (_navigationComponent != null)
        {
            _navigationComponent.UpdateCurrentGoal(GlobalTransform);
        }
        
        foreach (Node node in _attractedItemList)
        {
            GoldBar bar = (GoldBar)node;
            if (bar != null)
            {
                bar.SetTarget(GlobalTransform.origin);
            }
        }
    }

    public void OnItemAttractorBodyEntered(Node node)
    {
        GD.Print("Item entered " + node);
        _attractedItemList.Add(node);
    }
    
    public void OnItemAttractorBodyExited(Node node)
    {
        GD.Print("Item exited " + node);
        GoldBar bar = (GoldBar)node;
        if (bar != null)
        {
            bar.UnsetTarget();
        }
        _attractedItemList.Remove(node);
    }

    public void OnItemPickupAreaBodyEntered(Node body)
    {
        GD.Print("Picking up item: " + body);
        if (body is GoldBar)
        {
            GoldBar bar = (GoldBar)body;
            bar.QueueFree();
        }
    }
}