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neon-sprawl/docs/plans/NEO-91-implementation-plan.md

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NEO-91 — Implementation plan

Story reference

Field Value
Key NEO-91
Title E5M2-05: Prototype NPC instance registry + combat-target migration
Linear https://linear.app/neon-sprawl/issue/NEO-91/e5m2-05-prototype-npc-instance-registry-combat-target-migration
Module E5.M2 — NpcAiAndBehaviorProfiles · Epic 5 Slice 2 · backlog E5M2-05
Branch NEO-91-npc-instance-registry-combat-target-migration
Precursor NEO-89 — INpcBehaviorDefinitionRegistry + DI (Done on main)
Pattern NEO-83 — combat-targets GET + PrototypeTargetRegistry; NEO-89 — injectable behavior registry
Client counterpart NEO-97 — Godot archetype markers + tab cycle (out of scope here; breaking id change must land in NEO-97 before playable Godot verification)

Kickoff clarifications

Topic Question Agent recommendation Answer
Registry shape New PrototypeNpcRegistry vs extend PrototypeTargetRegistry? New PrototypeNpcRegistry in Game/Npc/ — targeting/combat consume it; remove alpha/beta ids. User: new PrototypeNpcRegistry.
World anchors Where to place three NPC instances? Melee at alpha (-3, 0.5, -3), ranged at beta (3, 0, 3), elite at origin (0, 0.5, 0); SharedLockRadius 6.0. User: preserve alpha/beta + elite at origin.
Behavior binding Which behavior def per instance? 1:1: melee→prototype_melee_pressure, ranged→prototype_ranged_control, elite→prototype_elite_mini_boss. Adopted (frozen naming in E5.M2).
Bruno defeat spine Which NPC for defeat AC? prototype_npc_melee (100 HP, 4× pulse — alpha replacement). User: melee.

Goal, scope, and out-of-scope

Goal: Replace passive prototype_target_alpha / prototype_target_beta dummies with three NPC combat instances wired into targeting, cast resolution, and the combat-target HP store — each instance bound to a frozen behaviorDefId with max HP from the behavior catalog.

In scope (from Linear + E5M2-05):

  • PrototypeNpcRegistry in Game/Npc/: instance id, behaviorDefId, world anchor, shared lock radius.
  • Migrate ICombatEntityHealthStore gates and max HP from flat 100 → per-instance maxHp via INpcBehaviorDefinitionRegistry.
  • Replace PrototypeTargetRegistry alpha/beta usage across targeting, cast, combat-targets GET, dev fixture reset.
  • Update server unit/integration tests and all Bruno smokes that reference alpha/beta.
  • Document breaking id change + required client constant migration (NEO-97).

Out of scope (from Linear + backlog):

  • Behavior tick, aggro, telegraphs (NEO-92+).
  • Godot markers / tab cycle (NEO-97).
  • docs/manual-qa/NEO-91.md — server-only; Bruno + automated tests (NEO-83/90 pattern).

Acceptance criteria checklist

  • Cast + combat-targets GET operate on three NPC ids only (alpha/beta removed).
  • Each instance references a valid frozen behaviorDefId resolvable via INpcBehaviorDefinitionRegistry.
  • Bruno defeat spine passes for prototype_npc_melee (4× pulse → defeated).

Technical approach

  1. PrototypeNpcRegistry (Game/Npc/):

    • Stable id constants: prototype_npc_melee, prototype_npc_ranged, prototype_npc_elite.

    • SharedLockRadius = 6.0 (same convention as E1.M3/E5.M1 dummies).

    • PrototypeNpcInstanceEntry: BehaviorDefId, anchor X/Y/Z, LockRadius.

    • Frozen bindings (kickoff):

      Instance id behaviorDefId Anchor (X, Y, Z)
      prototype_npc_melee prototype_melee_pressure (-3, 0.5, -3)
      prototype_npc_ranged prototype_ranged_control (3, 0, 3)
      prototype_npc_elite prototype_elite_mini_boss (0, 0.5, 0)

    • TryGet(instanceIdLowercase, out entry), GetInstanceIdsInOrder() (ordinal sort — tab cycle order for future NEO-97).

  2. Retire PrototypeTargetRegistry: Remove alpha/beta ids and the class (or leave a one-release obsolete shim only if grep shows external consumers — prefer delete and update all server references). Targeting/combat import PrototypeNpcRegistry instead.

  3. InMemoryCombatEntityHealthStore: Constructor-inject INpcBehaviorDefinitionRegistry. Gate rows on PrototypeNpcRegistry.TryGet. Lazy-init currentHp to behavior maxHp; CreateSnapshot / TryResetToFull use per-instance max from catalog. Remove dependence on PrototypeCombatConstants.MaxPrototypeTargetHp (delete constant class if unused).

  4. Targeting + cast paths: PlayerTargetStateReader, TargetingApi, AbilityCastApi — swap PrototypeTargetRegistry.TryGet → PrototypeNpcRegistry.TryGet (range math unchanged).

  5. Combat-targets GET + fixture: CombatTargetsWorldApi, CombatTargetFixtureApi — enumerate PrototypeNpcRegistry.GetInstanceIdsInOrder() (expect 3 rows).

  6. Bruno migration: Replace every prototype_target_alpha / prototype_target_beta with NPC ids. Key updates:

    • combat-targets/ — assert 3 targets; defeat spine on prototype_npc_melee (same 4× pulse / 75→50→25→0 stepping).
    • ability-cast/ — happy cast on prototype_npc_ranged (beta slot/spine replacement); lock/defeat spines on melee.
    • targeting/ — select melee/ranged ids.
    • gig-progression/Get gig progression after defeat spine.bru — melee defeat.
    • scripts/combat-targets-reset-helper.js — unchanged route; resets all registry ids server-side.

  7. Docs: server/README.md — combat targets section lists three NPC ids + per-archetype max HP; note PrototypeNpcRegistry + breaking change for client/scripts/prototype_target_constants.gd (NEO-97). Update E5_M2 instance registry bullet and E5M2-prototype-backlog.md E5M2-05 checkboxes when landed.

Expected snapshot values (fresh server, prototype_pulse = 25 damage)

Instance maxHp (from behavior def) After 4× pulse on melee only
prototype_npc_elite 200 200 / 200
prototype_npc_melee 100 0 / 100, defeated: true
prototype_npc_ranged 80 80 / 80

(GET row order: ascending targetId — elite, melee, ranged.)

Files to add

Path Purpose
server/NeonSprawl.Server/Game/Npc/PrototypeNpcRegistry.cs Frozen three-instance registry: ids, behavior bindings, anchors, lock radius, ordered enumeration.
server/NeonSprawl.Server.Tests/Game/Npc/PrototypeNpcRegistryTests.cs AAA unit tests: three ids in order, valid behavior bindings, anchor/lock radius parity, unknown id fails.
docs/plans/NEO-91-implementation-plan.md This plan.

Files to modify

Path Rationale
server/NeonSprawl.Server/Game/Combat/InMemoryCombatEntityHealthStore.cs Gate on PrototypeNpcRegistry; per-instance max HP from INpcBehaviorDefinitionRegistry.
server/NeonSprawl.Server/Game/Combat/CombatEntityHealthServiceCollectionExtensions.cs Ensure health store resolves with behavior registry dependency (singleton ctor injection).
server/NeonSprawl.Server/Game/Combat/CombatTargetsWorldApi.cs Enumerate NPC instance ids from PrototypeNpcRegistry.
server/NeonSprawl.Server/Game/Combat/CombatTargetFixtureApi.cs Reset all three NPC instance rows.
server/NeonSprawl.Server/Game/Combat/ICombatEntityHealthStore.cs XML remarks: NPC instance ids + catalog max HP (not alpha/beta / flat 100).
server/NeonSprawl.Server/Game/Combat/PrototypeCombatConstants.cs Remove or narrow — flat 100 no longer authoritative.
server/NeonSprawl.Server/Game/Targeting/PlayerTargetStateReader.cs Use PrototypeNpcRegistry.TryGet for validity/range.
server/NeonSprawl.Server/Game/Targeting/TargetingApi.cs Target select gate on NPC registry.
server/NeonSprawl.Server/Game/AbilityInput/AbilityCastApi.cs Cast target gate on NPC registry.
server/NeonSprawl.Server/Game/Targeting/PrototypeTargetRegistry.cs Delete (after references migrated).
server/README.md Document three NPC combat targets, registry, breaking id change, per-archetype HP.
server/NeonSprawl.Server.Tests/Game/Combat/CombatEntityHealthStoreTests.cs AAA tests for per-archetype max HP, melee/ranged/elite independence.
server/NeonSprawl.Server.Tests/Game/Combat/CombatTargetsWorldApiTests.cs Three targets, ordinal order, melee defeat spine, per-archetype maxHp assertions.
server/NeonSprawl.Server.Tests/Game/Combat/CombatOperationsTests.cs Replace alpha/beta ids with NPC ids.
server/NeonSprawl.Server.Tests/Game/Combat/CombatTargetFixtureApiTests.cs Three-instance reset.
server/NeonSprawl.Server.Tests/Game/Targeting/TargetingApiTests.cs NPC id select/range cases.
server/NeonSprawl.Server.Tests/Game/Targeting/PlayerTargetStateReaderTests.cs NPC anchor range checks.
server/NeonSprawl.Server.Tests/Game/AbilityInput/AbilityCastApiTests.cs Cast against NPC ids.
server/NeonSprawl.Server.Tests/Game/AbilityInput/CooldownSnapshotApiTests.cs Update target id literals if referenced.
server/NeonSprawl.Server.Tests/Game/Gigs/GigProgressionGrantPersistenceIntegrationTests.cs Melee defeat id in integration spine.
bruno/neon-sprawl-server/combat-targets/*.bru Three-target assertions; melee defeat spine.
bruno/neon-sprawl-server/ability-cast/*.bru NPC target ids in lock/cast spines.
bruno/neon-sprawl-server/targeting/*.bru NPC target ids in select requests.
bruno/neon-sprawl-server/gig-progression/Get gig progression after defeat spine.bru Melee defeat spine.
docs/decomposition/modules/E5_M2_NpcAiAndBehaviorProfiles.md Instance registry landed note (when complete).
docs/decomposition/modules/documentation_and_implementation_alignment.md E5.M2 row — NEO-91 instance registry.
docs/plans/E5M2-prototype-backlog.md E5M2-05 acceptance checkboxes + landed note when complete.

Explicitly not modified (client — NEO-97): client/scripts/prototype_target_constants.gd, Godot tests, manual QA. Plan documents the required client migration.

Tests

File Coverage
server/NeonSprawl.Server.Tests/Game/Npc/PrototypeNpcRegistryTests.cs Three ids ordinal order; each behaviorDefId resolves via host registry; anchors + SharedLockRadius; unknown id fails TryGet.
server/NeonSprawl.Server.Tests/Game/Combat/CombatEntityHealthStoreTests.cs Lazy init to catalog maxHp (100/80/200); damage/defeat/reset per instance; independence across three rows.
server/NeonSprawl.Server.Tests/Game/Combat/CombatTargetsWorldApiTests.cs GET returns 3 targets in id order with correct maxHp; one pulse on melee → 75/100; four pulses → melee defeated, others full.
server/NeonSprawl.Server.Tests/Game/Combat/CombatOperationsTests.cs Resolve against NPC ids (spot-check melee + elite maxHp paths).
server/NeonSprawl.Server.Tests/Game/Targeting/TargetingApiTests.cs Select melee in range; unknown legacy alpha id → unknown_target.
server/NeonSprawl.Server.Tests/Game/AbilityInput/AbilityCastApiTests.cs Cast accept/deny with NPC target ids.

Bruno combat-targets/Get combat targets after cast spine.bru is the AC defeat spine (melee, 4× pulse). No docs/manual-qa/NEO-91.md (server-only).

Open questions / risks

Question / risk Agent recommendation Status
Linear blockedBy NEO-89 Proceed — NEO-89 Done on main. adopted
Client breakage until NEO-97 Document in plan + README; cross-link NEO-97; Bruno-only verification is not prototype-complete per full-stack epic decomposition. adopted
Flat MaxPrototypeTargetHp removal Delete constant; tests assert catalog values per instance. adopted
Gig XP defeat grant No change — grant fires on any target defeat; melee spine still satisfies NEO-44 chain. adopted
Elite HP in future spines Defer 8× pulse Bruno until needed; melee spine satisfies AC. deferred

Decisions (kickoff)

  • PrototypeNpcRegistry in Game/Npc/ — new source of truth; retire alpha/beta (user confirmed).
  • Anchors: melee (-3, 0.5, -3), ranged (3, 0, 3), elite (0, 0.5, 0); lock radius 6.0 (user confirmed).
  • Behavior binding: 1:1 melee/ranged/elite → frozen behavior ids (adopted).
  • Bruno defeat spine: prototype_npc_melee (user confirmed).