using Content.Shared.Alert;
using Content.Shared.Movement.Pulling.Systems;
using Robust.Shared.GameStates;
using Robust.Shared.Map;
using Robust.Shared.Prototypes;
using Robust.Shared.Serialization.TypeSerializers.Implementations.Custom;

namespace Content.Shared.Movement.Pulling.Components;

/// <summary>
/// Specifies an entity as being able to pull another entity with <see cref="PullableComponent"/>
/// </summary>
[RegisterComponent, NetworkedComponent, AutoGenerateComponentState]
[Access(typeof(PullingSystem))]
public sealed partial class PullerComponent : Component
{
    /// <summary>
    ///     Next time the puller change where they are pulling the target towards.
    /// </summary>
    [DataField(customTypeSerializer: typeof(TimeOffsetSerializer)), AutoNetworkedField]
    public TimeSpan NextPushTargetChange;

    [DataField, AutoNetworkedField]
    public TimeSpan NextPushStop;

    [DataField]
    public TimeSpan PushChangeCooldown = TimeSpan.FromSeconds(0.1f), PushDuration = TimeSpan.FromSeconds(5f);

    // Before changing how this is updated, please see SharedPullerSystem.RefreshMovementSpeed
    public float WalkSpeedModifier => Pulling == default ? 1.0f : 0.95f;

    public float SprintSpeedModifier => Pulling == default ? 1.0f : 0.95f;

    /// <summary>
    ///     Entity currently being pulled/pushed if applicable.
    /// </summary>
    [AutoNetworkedField, DataField]
    public EntityUid? Pulling;

    /// <summary>
    ///     The position the entity is currently being pulled towards.
    /// </summary>
    [AutoNetworkedField, DataField]
    public EntityCoordinates? PushingTowards;

    /// <summary>
    ///     Does this entity need hands to be able to pull something?
    /// </summary>
    [DataField]
    public bool NeedsHands = true;

    /// <summary>
    ///     The maximum acceleration of pushing, in meters per second squared.
    /// </summary>
    [DataField]
    public float PushAcceleration = 0.3f;

    /// <summary>
    ///     The maximum speed to which the pulled entity may be accelerated relative to the push direction, in meters per second.
    /// </summary>
    [DataField]
    public float MaxPushSpeed = 1.2f;

    /// <summary>
    ///     The maximum distance between the puller and the point towards which the puller may attempt to pull it, in meters.
    /// </summary>
    [DataField]
    public float MaxPushRange = 2f;
    [DataField]
    public ProtoId<AlertPrototype> PullingAlert = "Pulling";
}