#pragma once

struct FactoryState;
class Hasher;

// Folds every building, construction site, deconstruction entry and tile claim into the
// hasher in deterministic order (docs/replay_design.md).
//
// A free function over the state rather than a system method, for the reason the rest of
// the read surface is one (FactoryQueries.h): fingerprinting the factory needs the data
// and nothing else -- no config, no belts, no RNG -- so it should not be reachable only
// through whichever system happens to tick that data.
//
// The order it folds in is load-bearing. Two runs of the same replay must fold identical
// values in an identical sequence, so nothing here may be reordered, and any field added
// to FactoryState that the simulation reads must be appended at the end rather than
// inserted (docs/replay_design.md, DeterminismTest).
void appendChecksum(const FactoryState& state, Hasher& hasher);