Reshapes every UI-driven sim mutation to flow through one path so it can be
recorded and replayed later, with behaviour unchanged.
- Command model (lib): Command base + derived types (PlaceBuilding, Demolish,
RotateInPlace, SetRecipe, SetShipLayout, Set[Site]SplitterFilters,
ClearBeltTiles, ApplySchematicChoice, Reset), each with a playerId for the
future-multiplayer shape. PlaceBuilding is atomic (carries optional
recipe/layout/filters) because deferred commands never return the new
BuildingId to the caller.
- CommandManager (lib): FIFO queue holding a Simulation&; enqueue + drain.
- Simulation::apply(const Command&): the single chokepoint, dispatching by
kind to the existing mutators. Mutators stay public (enforced by convention,
not compile-time, so the test suite keeps driving the sim directly).
- Timing: GameWorldView owns the CommandManager and drains it once per frame in
onFrame, before the tick batch (runs at 0x too, so build-while-paused is
preserved). A drained Reset triggers the view reset.
- UI fan-in: GameWorldView enqueues its own input directly; MainWindow and
SelectedBuildingPanel emit CommandRequestedEvent, which GameWorldView
subscribes to and enqueues. No UI site mutates the sim directly anymore.
- CommandTest: asserts apply(...) yields byte-identical state to the direct
mutator path, and that CommandManager drains FIFO through apply.
Full suite green (338 cases / 3353 assertions); determinism double-run still
passes. Design doc updated with the atomic-PlaceBuilding and convention-
enforcement decisions.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01DUsFgd2Ga6pmLz8giS8WUn
Captures the deterministic command-replay design (seed + config hash +
tick-tagged command log, re-simulated on playback), the command-chokepoint
and timing model, determinism/checksum strategy, file format, and a
sequenced Phase 0-4 implementation plan.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01DUsFgd2Ga6pmLz8giS8WUn
