Release v0.1.2 2026-07-11
This commit is contained in:
Warren H
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import { BOSS_DEFINITIONS } from "../bossCatalog";
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import { angleTo, moveToward, pointToSegmentDistance } from "../geometry";
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import type { BossMotionState, BossState, MemberId, SlashLane, WorldPosition } from "../types";
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import { applyMelee, chooseLivingTarget, cloneMotion, createBaseMotion, memberName } from "./shared";
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import type { BossMechanicContext, BossMechanicResult, UpcomingMechanic } from "./types";
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export const EMBER_MANTIS_SLASH = {
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firstAt: 5,
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repeatDelay: 3.4,
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sidestepDuration: 0.55,
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sidestepDistance: 3.8,
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sidestepSpeed: 7.2,
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telegraphDuration: 0.9,
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recoverDuration: 0.7,
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laneLength: 18,
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lineWidth: 1.65,
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crossWidth: 1.45,
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lineDamage: 32,
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crossDamage: 25,
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crossAngle: Math.PI * 0.18,
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staggerDuration: 0.35,
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aiClearance: 1.35,
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aiEvadeSpeed: 4.8,
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} as const;
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const TARGET_ORDER: readonly MemberId[] = ["nia", "orin", "aelia", "vale", "brann"];
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const MIN_BOSS_X = -5.8;
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const MAX_BOSS_X = 5.8;
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export function createEmberMantisState(): BossState {
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const definition = BOSS_DEFINITIONS["ember-mantis-duelist"];
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return {
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id: definition.id,
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name: definition.name,
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maxHp: definition.maxHp,
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hp: definition.maxHp,
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nextMeleeAt: 2.2,
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nextNovaAt: Number.POSITIVE_INFINITY,
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nextBrandAt: Number.POSITIVE_INFINITY,
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brandCount: 0,
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};
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}
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export function createEmberMantisMotion(): BossMotionState {
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return {
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...createBaseMotion("ember-mantis-duelist"),
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position: [0, -6.6],
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nextMechanicAt: EMBER_MANTIS_SLASH.firstAt,
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};
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}
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function clampBossX(value: number) {
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return Math.max(MIN_BOSS_X, Math.min(MAX_BOSS_X, value));
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}
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function createLane(
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id: string,
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center: WorldPosition,
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angle: number,
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width: number,
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damage: number,
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): SlashLane {
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const halfLength = EMBER_MANTIS_SLASH.laneLength * 0.5;
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const dx = Math.sin(angle) * halfLength;
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const dz = Math.cos(angle) * halfLength;
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return {
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id,
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start: [center[0] - dx, center[1] - dz],
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end: [center[0] + dx, center[1] + dz],
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width,
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damage,
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};
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}
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function beginSidestep(
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motion: BossMotionState,
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party: BossMechanicContext["party"],
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partyPositions: BossMechanicContext["partyPositions"],
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time: number,
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) {
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const targetId = chooseLivingTarget(party, TARGET_ORDER, motion.mechanicCount);
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const direction = motion.mechanicCount % 2 === 0 ? 1 : -1;
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let targetX = clampBossX(motion.position[0] + direction * EMBER_MANTIS_SLASH.sidestepDistance);
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if (Math.abs(targetX - motion.position[0]) < 1) {
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targetX = clampBossX(motion.position[0] - direction * EMBER_MANTIS_SLASH.sidestepDistance);
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}
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return {
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...motion,
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mode: "mantis_sidestep" as const,
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chargeTargetId: targetId,
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chargeEnd: [targetX, motion.position[1]] as WorldPosition,
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phaseStartedAt: time,
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phaseEndsAt: time + EMBER_MANTIS_SLASH.sidestepDuration,
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nextMechanicAt: Number.POSITIVE_INFINITY,
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slashLanes: [],
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mechanicHitIds: [],
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pounceCenter: [partyPositions[targetId][0], partyPositions[targetId][1]] as WorldPosition,
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};
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}
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function beginSlashTelegraph(
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motion: BossMotionState,
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partyPositions: BossMechanicContext["partyPositions"],
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time: number,
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) {
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const target = partyPositions[motion.chargeTargetId];
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const aimedAngle = angleTo(motion.position, target);
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const isCrossSlash = motion.mechanicCount % 2 === 1;
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const slashNumber = motion.mechanicCount + 1;
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const lanes = isCrossSlash
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? [
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createLane(`cross-${slashNumber}-left`, target, aimedAngle - EMBER_MANTIS_SLASH.crossAngle, EMBER_MANTIS_SLASH.crossWidth, EMBER_MANTIS_SLASH.crossDamage),
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createLane(`cross-${slashNumber}-right`, target, aimedAngle + EMBER_MANTIS_SLASH.crossAngle, EMBER_MANTIS_SLASH.crossWidth, EMBER_MANTIS_SLASH.crossDamage),
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]
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: [createLane(`line-${slashNumber}`, target, aimedAngle, EMBER_MANTIS_SLASH.lineWidth, EMBER_MANTIS_SLASH.lineDamage)];
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return {
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...motion,
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mode: isCrossSlash ? "mantis_cross_telegraph" as const : "mantis_line_telegraph" as const,
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phaseStartedAt: time,
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phaseEndsAt: time + EMBER_MANTIS_SLASH.telegraphDuration,
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mechanicCount: slashNumber,
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slashLanes: lanes,
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mechanicHitIds: [],
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};
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}
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function resolveSlash(
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motion: BossMotionState,
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context: BossMechanicContext,
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events: BossMechanicResult["events"],
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) {
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const isCrossSlash = motion.mode === "mantis_cross_telegraph";
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const hitIds: MemberId[] = [];
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const party = context.party.map((member) => {
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if (member.hp <= 0) return member;
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const lane = motion.slashLanes.find((candidate) =>
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pointToSegmentDistance(context.partyPositions[member.id], candidate.start, candidate.end) <= candidate.width * 0.5,
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);
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if (!lane) return member;
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hitIds.push(member.id);
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events.push({
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at: context.time,
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message: `${member.name} is caught by ${isCrossSlash ? "Cross Slash" : "Line Slash"}.`,
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tone: "danger",
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pulseKind: "slash",
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targetId: member.id,
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});
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return {
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...context.damageMember(member, lane.damage, context.partyPositions[member.id], context.time),
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knockedUntil: Math.max(member.knockedUntil, context.time + EMBER_MANTIS_SLASH.staggerDuration),
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};
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});
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return { party, hitIds };
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}
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export function advanceEmberMantisMechanics(context: BossMechanicContext): BossMechanicResult {
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const boss = { ...context.boss };
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let motion = cloneMotion(context.motion);
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let party = context.party;
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const events: BossMechanicResult["events"] = [];
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if (motion.mode === "holding") {
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const tank = context.partyPositions.brann;
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motion.position = moveToward(
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motion.position,
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[tank[0] + motion.formationOffsetX, tank[1] - 4.25],
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2.5 * context.delta,
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);
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if (context.time >= motion.nextMechanicAt) {
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motion = beginSidestep(motion, party, context.partyPositions, context.time);
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events.push({
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at: context.time,
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message: `Ember Mantis sidesteps toward ${memberName(party, motion.chargeTargetId)}. Track the blades.`,
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tone: "danger",
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pulseKind: "slash",
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targetId: motion.chargeTargetId,
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});
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}
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} else if (motion.mode === "mantis_sidestep") {
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motion.position = moveToward(motion.position, motion.chargeEnd, EMBER_MANTIS_SLASH.sidestepSpeed * context.delta);
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if (context.time >= motion.phaseEndsAt) {
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motion = beginSlashTelegraph(motion, context.partyPositions, context.time);
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const cross = motion.mode === "mantis_cross_telegraph";
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events.push({
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at: context.time,
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message: cross ? "Cross Slash! Find a safe quadrant." : "Line Slash! Clear the glowing lane.",
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tone: "danger",
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pulseKind: "slash",
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targetId: motion.chargeTargetId,
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});
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}
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} else if (motion.mode === "mantis_line_telegraph" || motion.mode === "mantis_cross_telegraph") {
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if (context.time >= motion.phaseEndsAt) {
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const resolved = resolveSlash(motion, context, events);
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party = resolved.party;
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motion = {
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...motion,
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mode: "mantis_recover",
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phaseStartedAt: context.time,
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phaseEndsAt: context.time + EMBER_MANTIS_SLASH.recoverDuration,
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mechanicHitIds: resolved.hitIds,
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};
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}
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} else if (motion.mode === "mantis_recover" && context.time >= motion.phaseEndsAt) {
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motion = {
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...motion,
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mode: "holding",
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phaseStartedAt: context.time,
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phaseEndsAt: 0,
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nextMechanicAt: context.time + EMBER_MANTIS_SLASH.repeatDelay,
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slashLanes: [],
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mechanicHitIds: [],
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};
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}
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applyMelee(boss, motion, party, context.partyPositions, context.time, 1.9, 14, context.damageMember);
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return { boss, motion, party, events };
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}
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export function upcomingEmberMantisMechanic(
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boss: BossState,
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motion: BossMotionState,
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time: number,
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): UpcomingMechanic {
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void boss;
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if (motion.mode === "mantis_sidestep") {
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return { name: "Duelist repositioning", remaining: Math.max(0, motion.phaseEndsAt - time), cycle: EMBER_MANTIS_SLASH.sidestepDuration, urgent: true };
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}
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if (motion.mode === "mantis_line_telegraph") {
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return { name: "Line Slash — clear lane", remaining: Math.max(0, motion.phaseEndsAt - time), cycle: EMBER_MANTIS_SLASH.telegraphDuration, urgent: true };
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}
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if (motion.mode === "mantis_cross_telegraph") {
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return { name: "Cross Slash — safe quadrant", remaining: Math.max(0, motion.phaseEndsAt - time), cycle: EMBER_MANTIS_SLASH.telegraphDuration, urgent: true };
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}
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if (motion.mode === "mantis_recover") {
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return { name: "Cinderblade exposed", remaining: Math.max(0, motion.phaseEndsAt - time), cycle: EMBER_MANTIS_SLASH.recoverDuration, urgent: false };
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}
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const nextIsCross = motion.mechanicCount % 2 === 1;
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const remaining = Math.max(0, motion.nextMechanicAt - time);
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return {
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name: nextIsCross ? "Cross Slash" : "Line Slash",
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remaining,
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cycle: EMBER_MANTIS_SLASH.repeatDelay + EMBER_MANTIS_SLASH.telegraphDuration,
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urgent: remaining < 2.5,
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};
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}
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