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using System;
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using System.Runtime.InteropServices;
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using gaemstone.ECS.Utility;
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using static flecs_hub.flecs;
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namespace gaemstone.ECS;
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public unsafe struct World
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: IEquatable<World>
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, IDisposable
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{
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public ecs_world_t* Handle { get; }
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public bool IsDeferred => ecs_is_deferred(this);
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public bool IsQuitRequested => ecs_should_quit(this);
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public World(ecs_world_t* handle)
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=> Handle = handle;
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/// <summary> Initializes a new Flecs world. </summary>
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/// <param name="minimal"> If true, doesn't automatically import built-in modules. </param>
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public World(bool minimal = false)
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{
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[UnmanagedCallersOnly]
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static void Abort() => throw new FlecsAbortException();
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ecs_os_set_api_defaults();
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var api = ecs_os_get_api();
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api.abort_ = new FnPtr_Void { Pointer = &Abort };
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ecs_os_set_api(&api);
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Handle = minimal ? ecs_mini() : ecs_init();
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}
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public bool Progress(TimeSpan delta)
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=> ecs_progress(this, (float)delta.TotalSeconds);
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public void Quit()
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=> ecs_quit(this);
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public void Dispose()
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=> ecs_fini(this);
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public Entity LookupAlive(Entity value)
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=> new(ecs_get_alive(this, value));
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public Entity LookupPath(EntityPath path, Entity parent = default,
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bool throwOnNotFound = false)
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=> new(EntityPath.Lookup(this, path, parent, throwOnNotFound));
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// TODO: Provide overload that uses a UTF-8 byte span?
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public Entity LookupSymbol(string symbol)
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{
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using var alloc = TempAllocator.Use();
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return new(ecs_lookup_symbol(this, alloc.AllocateCString(symbol), false));
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}
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public bool Equals(World other)
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{
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if (Handle == other.Handle) return true;
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return ecs_get_world((ecs_poly_t*)Handle)
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== ecs_get_world((ecs_poly_t*)other.Handle);
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}
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public override bool Equals(object? obj)
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=> (obj is World other) && Equals(other);
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public override int GetHashCode()
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=> ((nint)ecs_get_world((ecs_poly_t*)Handle)).GetHashCode();
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public static bool operator ==(World left, World right) => left.Equals(right);
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public static bool operator !=(World left, World right) => !left.Equals(right);
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public static implicit operator ecs_world_t*(World w) => w.Handle;
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}
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