using Unity.Entities;

namespace ProjectM.Simulation
{
    /// <summary>
    /// Tag marking the single GLOBAL shared-resource ledger — the entity whose [GhostField]
    /// <see cref="StorageEntry"/> buffer holds harvested resources (Aether/ore/biomass) replicated to ALL
    /// connections. It lives on the ownerless interpolated CycleDirector ghost, which carries NO
    /// <see cref="RegionTag"/>, so GhostRelevancy (SetIsIrrelevant) keeps it relevant to players in EVERY
    /// region — base AND expedition — unlike the region-tagged base storage container (which relevancy hides
    /// from expedition players). Server systems resolve the ledger via
    /// <c>GetSingletonEntity&lt;ResourceLedger&gt;()</c> then <c>GetBuffer&lt;StorageEntry&gt;()</c> — NEVER
    /// <c>GetSingleton&lt;StorageEntry&gt;</c> (the base container owns a second StorageEntry buffer, so a
    /// buffer-typed singleton query would throw "multiple instances").
    /// </summary>
    public struct ResourceLedger : IComponentData { }
}