using Unity.Entities;

namespace ProjectM.Simulation
{
    /// <summary>
    /// Pure save-apply helpers shared by the server spawn system (born-correct load) and EditMode tests.
    /// Burst-safe: unmanaged, non-generic, no enums (avoids the cross-assembly-generic Burst ICE class).
    /// </summary>
    public static class SaveApply
    {
        /// <summary>Replace a StorageEntry ledger buffer's contents with a staged PendingSaveLedgerRow buffer.</summary>
        public static void WriteLedger(DynamicBuffer<PendingSaveLedgerRow> src, DynamicBuffer<StorageEntry> dest)
        {
            dest.Clear();
            for (int i = 0; i < src.Length; i++)
                dest.Add(new StorageEntry { ItemId = src[i].ItemId, Count = src[i].Count });
        }

        /// <summary>EB-1: map a serialized <see cref="StructureSave"/> to the staged <see cref="PendingStructure"/>
        /// (the menu->ServerWorld copy in WorldLauncher). Pure so the field-for-field copy — including the
        /// easy-to-miss HP — is unit-tested; an omitted field here silently restores every structure at full HP.</summary>
        public static PendingStructure ToPending(in StructureSave s) => new PendingStructure
        {
            Type = s.Type,
            CellX = s.CellX,
            CellZ = s.CellZ,
            Direction = s.Direction,
            RemainingTicks = s.RemainingTicks,
            ConveyorResId = s.ConveyorResId,
            ConveyorCount = s.ConveyorCount,
            HP = s.HP,
        };
    }
}