using Unity.Entities;

namespace ProjectM.Simulation
{
    /// <summary>
    /// Server-world, UNMANAGED bridge holding a save slice the menu staged for a "Continue" session, applied
    /// AT SPAWN by the server CycleDirectorSpawnSystem so the director ghost is BORN correct — it never
    /// serializes a default <see cref="GoalProgress"/> / empty ledger to clients (no replication flicker). The
    /// menu creates exactly one of these (with the <see cref="PendingSaveLedgerRow"/> buffer) in the freshly
    /// created ServerWorld BEFORE the gameplay subscene streams in; the spawn system consumes + destroys it.
    /// Unmanaged so the Bursted spawn system reads it without a managed bridge.
    /// </summary>
    public struct PendingSave : IComponentData
    {
        public int GoalCharge;
        public int GoalTarget;

        /// <summary>END-1: Engine Core integrity to restore (0 = pre-v4 save / New Game -> born full at baked Max).</summary>
        public int CoreCurrent;

        /// <summary>0 = nothing staged (New Game); non-zero = apply the staged slice at director spawn.</summary>
        public byte HasData;
    }

    /// <summary>One staged ledger row for a Continue session; copied into the director's StorageEntry buffer at spawn.</summary>
    public struct PendingSaveLedgerRow : IBufferElementData
    {
        public ushort ItemId;
        public int Count;
    }
    /// <summary>One staged player-built structure row for a Continue session (M7); BaseRestoreSystem replays it
    /// charge-free into the freshly-streamed base. Mirrors <see cref="StructureSave"/> but as an unmanaged ECS
    /// buffer element (staged in the ServerWorld before the subscene streams).</summary>
    public struct PendingStructure : IBufferElementData
    {
        public byte Type;
        public int CellX;
        public int CellZ;
        public byte Direction;
        public uint RemainingTicks;
        public byte ConveyorResId;
        public int ConveyorCount;
        public float HP; // EB-1: staged hit points (BaseRestoreSystem restores 0 -> baked Max)
    }

    /// <summary>One staged machine I/O row (M7), joined to the <see cref="PendingStructure"/> buffer by index.
    /// Slot 0 = MachineInput, 1 = MachineOutput.</summary>
    public struct PendingStructureIo : IBufferElementData
    {
        public int StructureIndex;
        public byte Slot;
        public byte ResourceId;
        public int Count;
    }


    /// <summary>
    /// Host-only autosave request flag on the CycleDirector entity (added at spawn). The Bursted CyclePhaseSystem
    /// sets <see cref="Pending"/>=1 on the Siege-&gt;Calm checkpoint; the managed SaveWriteSystem reads it, writes
    /// the JSON save, and clears it. A plain byte => Burst-safe (no managed/string/file touch in the sim loop).
    /// </summary>
    public struct SaveRequest : IComponentData
    {
        public byte Pending;
    }
}