LukasandClaude Opus 5
be3778a0c9
A D&D stat block opened for a combatant now offers a Min/Avg/Max toggle below the Hit Points line, deriving both ends from the Hit Dice formula (3d6 + 6 -> 9 / 16 / 24). The switch is applied as a delta, so manual HP edits and damage already taken survive it. Unlike the PF2e weak/elite adjustment this is a convenience tool, not a rules mechanic: nothing but HP changes and the combatant is not renamed. The toggle is hidden when the HP field carries prose instead of a dice pool. Also extracts a SegmentedControl primitive. Game system, theme and the PF2e weak/elite toggle were three hand-rolled copies of the same markup, which is why the D&D toggle first came out chunkier and in the wrong accent color. All four now share one definition, and segments expose aria-pressed instead of signalling the active state by color alone. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
74 lines
1.7 KiB
TypeScript
74 lines
1.7 KiB
TypeScript
import type { DomainEvent } from "./events.js";
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import { type HpRange, type HpVariant, hpForVariant } from "./hp-range.js";
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import {
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type CombatantId,
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type DomainError,
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type Encounter,
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findCombatant,
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isDomainError,
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} from "./types.js";
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export interface SetHpVariantSuccess {
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readonly encounter: Encounter;
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readonly events: DomainEvent[];
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}
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/**
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* Switches a combatant's max HP between the minimum, average and maximum roll
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* of its Hit Dice.
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*
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* The shift is applied as a delta so manual HP edits and damage already taken
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* survive the switch: a creature missing 5 HP still misses 5 HP afterwards.
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*/
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export function setHpVariant(
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encounter: Encounter,
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combatantId: CombatantId,
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variant: HpVariant | undefined,
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range: HpRange,
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): SetHpVariantSuccess | DomainError {
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const found = findCombatant(encounter, combatantId);
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if (isDomainError(found)) return found;
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const { combatant } = found;
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if (combatant.hpVariant === variant) {
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return { encounter, events: [] };
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}
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const delta =
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hpForVariant(range, variant) - hpForVariant(range, combatant.hpVariant);
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const newMaxHp =
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combatant.maxHp === undefined
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? undefined
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: Math.max(1, combatant.maxHp + delta);
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const newCurrentHp =
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combatant.currentHp === undefined || newMaxHp === undefined
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? combatant.currentHp
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: Math.max(0, Math.min(combatant.currentHp + delta, newMaxHp));
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return {
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encounter: {
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...encounter,
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combatants: encounter.combatants.map((c) =>
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c.id === combatantId
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? {
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...c,
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maxHp: newMaxHp,
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currentHp: newCurrentHp,
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hpVariant: variant,
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}
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: c,
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),
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},
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events: [
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{
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type: "HpVariantSet",
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combatantId,
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variant,
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previousMaxHp: combatant.maxHp,
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newMaxHp,
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},
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],
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};
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}
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