75 lines
2.0 KiB
TypeScript
75 lines
2.0 KiB
TypeScript
import {
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EncounterResult,
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MissionDifficulty,
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MissionState,
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ResolveEncounterInput,
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SurvivorStats
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} from '@fog-explorer/api-interfaces';
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import { applyPerkModifiers, clamp } from './perk-math';
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const DIFFICULTY_BASE: Record<MissionDifficulty, number> = {
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[MissionDifficulty.Easy]: 0.72,
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[MissionDifficulty.Normal]: 0.6,
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[MissionDifficulty.Hard]: 0.48,
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[MissionDifficulty.Nightmare]: 0.38
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};
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export function resolveEncounter(input: ResolveEncounterInput): EncounterResult {
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const baseChance = DIFFICULTY_BASE[input.difficulty];
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const perkBoost = input.perkIds.length * 0.015;
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const statBoost =
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input.stats.stealth * 0.002 + input.stats.teamwork * 0.002 + input.stats.luck * 0.002;
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const successChance = clamp(
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applyPerkModifiers(baseChance + perkBoost + statBoost, []),
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0.05,
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0.95
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);
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const roll = seededRoll(input.seed ?? input.tickIndex);
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if (roll <= successChance) {
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return {
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outcome: 'success',
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text: 'The survivor outplayed the fog and advanced.',
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successChance,
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roll,
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nextState: MissionState.InProgress,
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nextStats: { ...input.stats, health: Math.min(100, input.stats.health + 1) }
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};
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}
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const injuryThreshold = successChance + 0.25;
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if (roll <= injuryThreshold) {
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const injured = applyDamage(input.stats, 14);
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return {
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outcome: 'injury',
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text: 'A close call leaves the survivor injured.',
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successChance,
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roll,
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nextState: injured.health <= 0 ? MissionState.Failed : MissionState.InProgress,
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nextStats: injured
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};
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}
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return {
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outcome: 'sacrifice',
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text: 'The fog claims another soul.',
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successChance,
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roll,
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nextState: MissionState.Failed,
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nextStats: { ...input.stats, health: 0 }
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};
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}
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function applyDamage(stats: SurvivorStats, amount: number): SurvivorStats {
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return {
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...stats,
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health: Math.max(0, stats.health - amount)
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};
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}
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function seededRoll(seed: number): number {
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const normalized = Math.abs(Math.sin(seed * 99991)) * 10000;
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return normalized - Math.floor(normalized);
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}
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