66 lines
1.9 KiB
TypeScript
66 lines
1.9 KiB
TypeScript
import type { ConditionId } from "./conditions.js";
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import { CONDITION_DEFINITIONS, VALID_CONDITION_IDS } from "./conditions.js";
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import type { DomainEvent } from "./events.js";
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import type { CombatantId, DomainError, Encounter } from "./types.js";
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export interface ToggleConditionSuccess {
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readonly encounter: Encounter;
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readonly events: DomainEvent[];
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}
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export function toggleCondition(
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encounter: Encounter,
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combatantId: CombatantId,
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conditionId: ConditionId,
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): ToggleConditionSuccess | DomainError {
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if (!VALID_CONDITION_IDS.has(conditionId)) {
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return {
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kind: "domain-error",
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code: "unknown-condition",
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message: `Unknown condition "${conditionId}"`,
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};
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}
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const targetIdx = encounter.combatants.findIndex((c) => c.id === combatantId);
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if (targetIdx === -1) {
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return {
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kind: "domain-error",
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code: "combatant-not-found",
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message: `No combatant found with ID "${combatantId}"`,
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};
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}
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const target = encounter.combatants[targetIdx];
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const current = target.conditions ?? [];
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const isActive = current.includes(conditionId);
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let newConditions: readonly ConditionId[] | undefined;
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let event: DomainEvent;
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if (isActive) {
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const filtered = current.filter((c) => c !== conditionId);
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newConditions = filtered.length > 0 ? filtered : undefined;
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event = { type: "ConditionRemoved", combatantId, condition: conditionId };
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} else {
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const added = [...current, conditionId];
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const order = CONDITION_DEFINITIONS.map((d) => d.id);
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added.sort((a, b) => order.indexOf(a) - order.indexOf(b));
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newConditions = added;
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event = { type: "ConditionAdded", combatantId, condition: conditionId };
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}
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const updatedCombatants = encounter.combatants.map((c) =>
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c.id === combatantId ? { ...c, conditions: newConditions } : c,
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);
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return {
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encounter: {
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combatants: updatedCombatants,
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activeIndex: encounter.activeIndex,
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roundNumber: encounter.roundNumber,
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},
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events: [event],
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};
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}
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