79 lines
2.9 KiB
Markdown
79 lines
2.9 KiB
Markdown
# The Steward — Simulation State Schema
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## Current contract
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`SimulationStateRecord` is the versioned JSON boundary for the current
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simulation. Schema v1 captures:
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- simulation seed, tick interval, tick count, clock remainder, and elapsed
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clock ticks;
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- every NPC's identity, needs, attributes, task lifecycle, target, position,
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starvation state, and decision RNG stream;
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- village resource counters;
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- controlled per-NPC wander RNG streams;
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- scene-independent resource state plus the definition facts needed while its
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ResourceNode is unloaded.
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The top-level identity is:
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```json
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{
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"schema": "the_steward.simulation",
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"schema_version": 1
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}
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```
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Unknown schema versions and structurally incomplete records are rejected. Add
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an explicit migration function before accepting a future version; never
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silently reinterpret old data as the newest layout.
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## Deterministic continuation
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RNG seeds and internal states are encoded as decimal strings. They are signed
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64-bit values and cannot safely pass through every JSON number implementation
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without precision loss. Converting them to ordinary JSON numbers caused a
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restored simulation to retain the same visible state while silently changing
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its future random sequence.
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`tests/simulation_state_serialization_test.gd` protects this contract by:
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1. running a fixed-seed scenario for 48 ticks without interruption;
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2. running the same scenario for 24 ticks;
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3. serializing and restoring into a fresh manager;
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4. running the remaining 24 ticks;
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5. requiring the complete final-state checksums to match.
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It also verifies clock remainder, resource amount/reservation/enabled
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round-tripping, presentation unload/rebind, and rejection of unsupported
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schemas.
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## Resource authority
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`SimulationManager` owns `ResourceStateRecord` instances independently of the
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scene tree. Amount, reservation, enabled state, action/resource identity,
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yield, and usage permissions remain available and serializable while no
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ResourceNode is loaded.
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ResourceNode binds to a record by stable ID and provides presentation,
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interaction transforms, and active-world discoverability. Unloading a node does
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not delete its record. Loading another node with the same stable ID rebinds to
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the existing record and cannot overwrite its amount or reservation with scene
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defaults.
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ResourceStateRecord v2 adds the definition facts needed while unloaded. Nested
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v1 resource records are migrated explicitly and hydrate their missing
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definition from a matching presentation node when one becomes available.
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## Deliberately out of scope
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This phase does not yet provide:
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- save-slot files, metadata, thumbnails, or atomic disk writes;
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- backward migrations beyond schema v1;
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- inventory, relationship, schedule, or history records;
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- a player-facing load flow;
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- save-slot persistence for scene-independent resource state.
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Those features should build on this boundary rather than inventing parallel
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serialization paths.
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