71 lines
2.4 KiB
TypeScript
71 lines
2.4 KiB
TypeScript
import type { DungeonEncounterEvent } from "./dungeonEncounterTypes";
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export interface DungeonEncounterMobObservation {
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readonly engaged: boolean;
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readonly dead: boolean;
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readonly despawned: boolean;
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readonly health: number;
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readonly maxHealth: number;
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}
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export interface DungeonEncounterMobCursorEntry {
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readonly engaged: boolean;
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readonly dead: boolean;
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readonly healthPercent: number;
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}
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export type DungeonEncounterMobCursor = Readonly<Record<string, DungeonEncounterMobCursorEntry>>;
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type CombatEdgeEvent = Extract<
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DungeonEncounterEvent,
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{ readonly kind: "entity-engaged" | "entity-health" | "entity-death" }
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>;
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export interface DungeonEncounterCombatEventBatch {
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readonly cursor: DungeonEncounterMobCursor;
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readonly events: readonly CombatEdgeEvent[];
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}
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function healthPercent(mob: DungeonEncounterMobObservation): number {
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if (!Number.isFinite(mob.maxHealth) || mob.maxHealth <= 0) return 0;
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return Math.max(0, Math.min(100, (Math.max(0, mob.health) / mob.maxHealth) * 100));
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}
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/**
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* Converts mutable combat-state edges into deterministic encounter events.
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* Despawned actors are deliberately omitted so scripted cleanup never looks
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* like a kill and a later respawn of the same stable id can engage normally.
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*/
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export function deriveDungeonEncounterCombatEvents(
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previous: DungeonEncounterMobCursor,
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mobs: Readonly<Record<string, DungeonEncounterMobObservation>>,
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now: number,
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): DungeonEncounterCombatEventBatch {
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const cursor: Record<string, DungeonEncounterMobCursorEntry> = {};
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const events: CombatEdgeEvent[] = [];
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for (const entityId of Object.keys(mobs).sort()) {
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const mob = mobs[entityId];
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if (mob.despawned) continue;
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const percent = healthPercent(mob);
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const prior = previous[entityId];
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cursor[entityId] = Object.freeze({
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engaged: mob.engaged,
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dead: mob.dead,
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healthPercent: percent,
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});
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if (mob.engaged && !mob.dead && !prior?.engaged) {
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events.push(Object.freeze({ kind: "entity-engaged", entityId, now }));
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}
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if (!mob.dead && percent < (prior?.healthPercent ?? 100)) {
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events.push(Object.freeze({ kind: "entity-health", entityId, healthPercent: percent, now }));
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}
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if (mob.dead && !prior?.dead) {
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events.push(Object.freeze({ kind: "entity-death", entityId, now }));
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}
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}
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return Object.freeze({ cursor: Object.freeze(cursor), events: Object.freeze(events) });
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}
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