using System.Threading;
using Content.Server.CPUJob.JobQueues;
using Robust.Shared.Map;

namespace Content.Server.NPC.Components;

/// <summary>
/// Added to NPCs that are moving.
/// </summary>
[RegisterComponent]
public sealed class NPCSteeringComponent : Component
{
    [ViewVariables] public Job<Queue<TileRef>>? Pathfind = null;
    [ViewVariables] public CancellationTokenSource? PathfindToken = null;

    /// <summary>
    /// Current path we're following to our coordinates.
    /// </summary>
    [ViewVariables] public Queue<TileRef> CurrentPath = new();

    /// <summary>
    /// End target that we're trying to move to.
    /// </summary>
    [ViewVariables(VVAccess.ReadWrite)] public EntityCoordinates Coordinates;

    /// <summary>
    /// Target that we're trying to move to. If we have a path then this will be the first node on the path.
    /// </summary>
    [ViewVariables] public EntityCoordinates CurrentTarget;

    /// <summary>
    /// How close are we trying to get to the coordinates before being considered in range.
    /// </summary>
    [ViewVariables(VVAccess.ReadWrite)] public float Range = 0.2f;

    /// <summary>
    /// How far does the last node in the path need to be before considering re-pathfinding.
    /// </summary>
    [ViewVariables(VVAccess.ReadWrite)] public float RepathRange = 1.5f;

    [ViewVariables] public SteeringStatus Status = SteeringStatus.Moving;
}

public enum SteeringStatus : byte
{
    /// <summary>
    /// If we can't reach the target (e.g. different map).
    /// </summary>
    NoPath,

    /// <summary>
    /// Are we moving towards our target
    /// </summary>
    Moving,

    /// <summary>
    /// Are we currently in range of our target.
    /// </summary>
    InRange,
}