using UnityEngine;

/// <summary>
/// Customer payment Compund Task
/// </summary>
public class Payment : CompoundTask
{
    // ================== CONSTRUCTOR ==================
    public Payment(HTNPlanner planner)
    {
        //Casting
        Customer customer = planner.Agent as Customer;

        //Get Exit Area Position from the worldstate
        Vector3 exitPos = planner.WorldState.Get<Transform>("ExitArea").position;

        //Checks if the cast is not successful
        if (customer == null)
        {
            Debug.Log("Casting failed!");
            return;
        }

        //Gets the payment first position
        Vector3 paymentArePos = planner.WorldState.Get<PaymentArea>("PaymentArea").FirstQueuePosition.position;

        //Handles in Case if the Queue is Empty
        Method payment = new Method("Join and Pay if Possible")

            //Add Preconditions to the method
            .AddPrecondition(new IsWishListEmpty("Is Wish List Empty"))

            //Add Subtasks of the method
            .AddSubTask(new JoinPaymentQueue()
                .AddPostCondition(new IsCostumerInTheQueue()))
            .AddSubTask(new WaitInTheQueueUntilFirst() //Coroutine Task
                .AddPostCondition(new IsFirstInTheQueue()))
            .AddSubTask(new ProceedPayment(customer.Basket.CurrentValue))
            .AddSubTask(new LeaveTheQueue())
            .AddSubTask(new GoToLocation(exitPos)
                .AddPostCondition(new HasReachedDestination(exitPos)) //Adding Postcondition to the Subtask
            .Build("Payment"));

        //Adding Methods
        AddMethod(payment);
    }
}