namespace OECS;

/// <summary>
/// A system that runs on every tick.
/// Implement <see cref="RunImpl"/> with the system logic.
/// Call <see cref="ISystem.Run"/> to execute with batching.
/// </summary>
public interface ISystem
{
    /// <summary>
    /// Implement this with the system's logic for this tick.
    /// The caller (e.g., <see cref="ISystem.Run"/>) wraps this
    /// in a batching scope so mutations and component accesses
    /// are automatically tracked.
    /// </summary>
    void RunImpl(World world);
}

/// <summary>
/// Extension methods for running systems with proper batching.
/// </summary>
public static class SystemExtensions
{
    /// <summary>
    /// Runs a system with a batching scope. Structural mutations are
    /// buffered, and <see cref="World.GetComponent{T}"/> calls are
    /// auto-tracked for modification until the system returns.
    /// </summary>
    public static void Run(this ISystem system, World world)
    {
        world.BeginBatching();
        system.RunImpl(world);
        world.EndBatching();
    }

    /// <summary>
    /// Runs a ticked system with a batching scope.
    /// </summary>
    public static void Run(this ITickedSystem system, World world, Tick tick)
    {
        world.BeginBatching();
        system.RunImpl(world, tick);
        world.EndBatching();
    }
}