using Content.Shared.EntityTable.ValueSelector;
using Robust.Shared.Prototypes;
using Robust.Shared.Random;

namespace Content.Shared.EntityTable.EntitySelectors;

/// <summary>
/// Gets the spawn for the entity prototype specified at whatever count specified.
/// </summary>
public sealed partial class EntSelector : EntityTableSelector
{
    public const string IdDataFieldTag = "id";

    /// <summary>
    /// The prototype this entry yields.
    /// </summary>
    [DataField(IdDataFieldTag, required: true)]
    public EntProtoId Id;

    /// <summary>
    /// The amount of entities this entry might yield.
    /// </summary>
    [DataField]
    public NumberSelector Amount = new ConstantNumberSelector(1);

    protected override IEnumerable<EntProtoId> GetSpawnsImplementation(IRobustRandom rand,
        IEntityManager entMan,
        IPrototypeManager proto,
        EntityTableContext ctx)
    {
        var num = Amount.Get(rand);
        for (var i = 0; i < num; i++)
        {
            yield return Id;
        }
    }

    protected override IEnumerable<(EntProtoId spawn, double)> ListSpawnsImplementation(IEntityManager entMan, IPrototypeManager proto, EntityTableContext ctx)
    {
        yield return (Id, 1f);
    }

    protected override IEnumerable<(EntProtoId spawn, double)> AverageSpawnsImplementation(IEntityManager entMan, IPrototypeManager proto, EntityTableContext ctx)
    {
        yield return (Id, Amount.Average());
    }

    /// <inheritdoc/>
    public override string ToString()
    {
        return $"{Id} x{Amount.Average()}";
    }
}