using Unity.Collections;
using Unity.Entities;

namespace ProjectM.Simulation
{
    /// <summary>
    /// Phase 1.7 Blade-Dash bookkeeping — SERVER-ONLY, plain (NOT a <c>[GhostField]</c>, so no ghost-hash impact;
    /// it piggybacks the <see cref="BoonEffects"/> player re-bake). Keys the per-dash "hit once" dedup to
    /// <see cref="DashState.StartTick"/> (which is <c>TickUtil.NonZero(now)</c> on every dash and cannot be relied
    /// upon to reset) rather than to any DashState clear edge: <c>DashTrailDamageSystem</c> clears <see cref="Hit"/>
    /// whenever the current StartTick differs from <see cref="LastStartTick"/>. Server-only (no rollback) so the
    /// accumulator is safe to persist across ticks.
    /// </summary>
    public struct DashTrailState : IComponentData
    {
        /// <summary>The <see cref="DashState.StartTick"/> the <see cref="Hit"/> set currently belongs to.</summary>
        public uint LastStartTick;
        /// <summary>Enemies already struck by the CURRENT dash's trail (one hit per enemy per dash).</summary>
        public FixedList64Bytes<Entity> Hit;
    }
}