91 lines
3.5 KiB
Markdown
91 lines
3.5 KiB
Markdown
# The Steward — Action System Architecture
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## Current flow
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```text
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SimulationManager tick
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-> ActionExecutionSystem advances needs and working progress
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-> ActionSelectionSystem chooses an action when the NPC is idle
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-> SimulationManager stores the selected action
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-> npc_target_requested
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-> WorldViewManager supplies the active visual's current position
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-> ActionTargetResolver consumes simulation state + ActiveWorldAdapter facts
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-> SimulationManager stores/reserves the target
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-> npc_travel_requested
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-> WorldViewManager commands NpcVisual travel
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-> arrival/navigation failure returns to SimulationManager
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```
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## Responsibilities
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### ActionSelectionSystem
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- reads NPC and village state;
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- evaluates current utility scores;
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- consumes the NPC's deterministic decision RNG;
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- returns an action ID, optional urgent-duration override, branch reason, and
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compared utility scores;
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- does not mutate targets, navigation, or visuals.
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### ActionExecutionSystem
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- advances hunger, energy, starvation, death, and working progress;
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- marks an action complete when its duration elapses;
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- does not select the next action or resolve a target.
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### ActionTargetResolver
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- reads target metadata from ActionDefinition;
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- consumes active-world facts through ActiveWorldAdapter;
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- checks simulation-owned ResourceStateRecord availability;
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- reserves and returns stable resource target IDs;
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- skips full-capacity activity sites based on authoritative NPC target claims;
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- returns typed activity-site, storage, or wander positions without owning
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presentation.
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### ActiveWorldAdapter
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- exposes loaded resource interaction positions;
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- exposes loaded storage and activity-site interaction positions;
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- exposes activity-site capacity as an active-world fact;
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- contains active-world query facts, not persistent mutable authority;
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- does not choose actions or reserve resources.
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### WorldViewManager
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- spawns and tracks NpcVisual instances;
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- supplies a visual's current position when resolution is requested;
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- applies travel commands;
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- reports arrival, navigation failure, and visual death state;
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- does not map actions, select targets, write target IDs, or mutate resources.
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### SimulationManager
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SimulationManager remains the orchestrator and event boundary. It owns
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simulation records, invokes the focused systems, stores selected actions and
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targets, and translates presentation callbacks into simulation transitions.
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It also publishes the latest `ActionSelectionResult` for presentation; the UI
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does not recompute decisions.
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Further decomposition should follow measured pressure rather than splitting it
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into managers for their own sake.
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## Active-position contract
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NpcVisual emits active position changes after successful movement.
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WorldViewManager forwards those facts through
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`SimulationManager.synchronize_npc_position()`. Arrival, navigation failure,
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and visual unload also perform a final synchronization.
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SimNPC stores both authoritative position and the resolved travel destination.
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The destination is versioned simulation state, so reloading a visual resumes
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the same route request without rerolling wander, resolving another resource, or
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changing a reservation.
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`tests/npc_visual_lifecycle_test.gd` proves that visual unload/reload preserves
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action, target ID, travel destination, resource reservation, position, and
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state checksum.
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Unloaded NPCs do not yet resolve abstract travel time; they remain in their
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current task state until an active visual or a future simulation-LOD travel
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system advances them.
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