using Godot;
using System;
using System.Collections.Generic;
using System.Diagnostics;

public class TaskQueueComponent : Component
{
    public abstract class Task
    {
        public abstract bool PerformTask(Entity entity, float delta);
    }

    public class NavigationTask : Task
    {
        public NavigationComponent.NavigationPoint NavigationPoint;

        public NavigationTask(NavigationComponent.NavigationPoint navigationPoint)
        {
            NavigationPoint = navigationPoint;
        }

        public override bool PerformTask(Entity entity, float delta)
        {
            return NavigationPoint.IsReached(entity.GlobalTransform);
        }
    }

    public class InteractionTask : Task
    {
        public Entity TargetEntity;

        public InteractionTask(Entity entity)
        {
            TargetEntity = entity;
        }

        public override bool PerformTask(Entity entity, float delta)
        {
            GD.Print("Interaction of " + entity + " with " + TargetEntity);

            if (TargetEntity is Chest)
            {
                Chest chest = (Chest)TargetEntity;
                chest.OnInteract();
            }
            return true;
        }
    }

    public Queue<Task> Queue;

    public TaskQueueComponent()
    {
        Queue = new Queue<Task>();
        Reset();
    }

    public void Reset()
    {
        Queue.Clear();
    }

    public void Process(Entity entity, float delta)
    {
        if (Queue.Count == 0)
        {
            return;
        }

        Task currentTask = Queue.Peek();
        while (currentTask.PerformTask(entity, delta))
        {
            Queue.Dequeue();
            if (Queue.Count == 0)
            {
                break;
            }
            
            currentTask = Queue.Peek();
            if (currentTask is NavigationTask)
            {
                NavigationTask navigationTask = (NavigationTask)currentTask;
                if (navigationTask != null && navigationTask.NavigationPoint.Flags ==
                    NavigationComponent.NavigationPoint.NavigationFlags.Orientation)
                {
                    GD.Print("Current task is orientation task!");
                }
            }
        }
    }
}