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using System;
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using static flecs_hub.flecs;
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namespace gaemstone.ECS;
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public readonly struct Identifier
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: IEquatable<Identifier>
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{
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public readonly ecs_id_t Value;
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public bool IsPair => ecs_id_is_pair(Value);
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public bool IsWildcard => ecs_id_is_wildcard(Value);
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public IdentifierFlags Flags => (IdentifierFlags)(Value & ECS_ID_FLAGS_MASK);
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public Entity RelationUnsafe => new(new() { Data = (Value & ECS_COMPONENT_MASK) >> 32 });
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public Entity TargetUnsafe => new(new() { Data = Value & ECS_ENTITY_MASK });
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public Identifier(ecs_id_t value) => Value = value;
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public static Identifier Combine(IdentifierFlags flags, Identifier id)
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=> new((ulong)flags | id.Value);
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public static Identifier Pair(Entity relation, Entity target)
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=> Combine(IdentifierFlags.Pair, new(
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((relation.Value.Data << 32) & ECS_COMPONENT_MASK) |
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( target.Value.Data & ECS_ENTITY_MASK )));
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public (EntityRef Relation, EntityRef Target)? AsPair(Universe universe)
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=> new IdentifierRef(universe, this).AsPair();
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public bool Equals(Identifier other) => Value.Data == other.Value.Data;
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public override bool Equals(object? obj) => (obj is Identifier other) && Equals(other);
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public override int GetHashCode() => Value.Data.GetHashCode();
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public override string? ToString()
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=> (Flags != default) ? $"Identifier(0x{Value.Data:X}, Flags={Flags})"
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: $"Identifier(0x{Value.Data:X})";
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public static bool operator ==(Identifier left, Identifier right) => left.Equals(right);
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public static bool operator !=(Identifier left, Identifier right) => !left.Equals(right);
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public static implicit operator ecs_id_t(Identifier i) => i.Value;
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}
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[Flags]
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public enum IdentifierFlags : ulong
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{
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Pair = 1ul << 63,
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Override = 1ul << 62,
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Toggle = 1ul << 61,
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Or = 1ul << 60,
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And = 1ul << 59,
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Not = 1ul << 58,
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}
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