feat: model specialization combat effects
This commit is contained in:
JB
@@ -0,0 +1,111 @@
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import { describe, expect, it } from 'vitest';
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import { calculateCombat, type CombatCalculationInput } from './combat.js';
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const base = (overrides: Partial<CombatCalculationInput> = {}): CombatCalculationInput => ({
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weapon: { baseDamage: 100, rpm: 600, magazine: 10, reloadSeconds: 2, headshotMultiplier: 2 },
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attributes: { weapon: 20, critChance: 25, critDamage: 50, headshotChance: 0, final: 10 },
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bindings: [
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{ attributeId: 'weapon', stage: 'weapon_damage', operator: 'add' },
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{ attributeId: 'critChance', stage: 'critical_chance', operator: 'add' },
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{ attributeId: 'critDamage', stage: 'critical_damage', operator: 'add' },
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{ attributeId: 'headshotChance', stage: 'headshot_chance', operator: 'add' },
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{ attributeId: 'final', stage: 'final_damage', operator: 'add' }
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],
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assumptions: { mode: 'off', hitRate: 100, headshotRate: 0, firingActivity: 100, encounterSeconds: 20 },
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...overrides
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});
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describe('calculateCombat', () => {
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it('calculates four hit values and reload-aware DPS', () => {
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const result = calculateCombat(base());
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expect(result.status).toBe('OK');
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expect(result.hitValues).toEqual({ normal: 132, critical: 198, headshot: 264, criticalHeadshot: 396 });
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expect(result.burstDps).toBe(1485);
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expect(result.sustainedDps).toBeCloseTo(495);
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});
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it('applies weights, hard caps, and a configured curve safely', () => {
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const result = calculateCombat(base({
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attributes: { weapon: 100 },
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bindings: [{
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attributeId: 'weapon',
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stage: 'weapon_damage',
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operator: 'add',
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weight: 2,
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softCap: 50,
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hardCap: 80,
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curveType: 'power',
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curveParameter: 1
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}]
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}));
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expect(result.hitValues?.normal).toBe(180);
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});
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it('keeps effects off, applies peak stacks, and honors per-effect overrides', () => {
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const stackingEffects = [{
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id: 'relentless',
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trigger: { hitsRequired: 9, windowSeconds: 3 },
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lifecycle: { maxStacks: 10, durationSeconds: 10, stacksPerTrigger: 1 },
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attributes: { weapon: 3, critDamage: 1 }
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}];
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const off = calculateCombat(base({ stackingEffects }));
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const peak = calculateCombat(base({
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stackingEffects,
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assumptions: { mode: 'off', perEffect: { relentless: { mode: 'peak' } } }
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}));
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expect(off.hitValues?.normal).toBe(132);
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expect(peak.hitValues?.normal).toBeCloseTo(165);
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expect(peak.stackSummaries[0].stacksAtEnd).toBe(10);
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});
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it('models encounter stack ramp and refresh with the weapon firing cycle', () => {
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const result = calculateCombat(base({
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stackingEffects: [{
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id: 'relentless',
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trigger: { hitsRequired: 9, windowSeconds: 3 },
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lifecycle: { maxStacks: 10, durationSeconds: 10, stacksPerTrigger: 1 },
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attributes: { weapon: 3 }
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}],
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assumptions: { mode: 'encounter', hitRate: 100, firingActivity: 100, encounterSeconds: 30 }
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}));
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expect(result.encounterDps).not.toBeNull();
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expect(result.encounterDps!).toBeGreaterThan(495);
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expect(result.stackSummaries[0].maxStacksReached).toBe(10);
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expect(result.stackSummaries[0].maintained).toBe(true);
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});
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it('does not trigger when expected hits cannot meet the trigger window', () => {
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const result = calculateCombat(base({
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stackingEffects: [{
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id: 'slow',
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trigger: { hitsRequired: 9, windowSeconds: 0.5 },
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lifecycle: { maxStacks: 10, durationSeconds: 10 },
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attributes: { weapon: 3 }
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}],
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assumptions: { mode: 'encounter', hitRate: 10, firingActivity: 50, encounterSeconds: 20 }
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}));
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expect(result.stackSummaries[0]).toMatchObject({ maxStacksReached: 0, averageStacks: 0, maintained: false });
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});
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it('returns explicit requirements instead of partial results', () => {
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const result = calculateCombat(base({
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weapon: { baseDamage: 100, rpm: 0, magazine: 0, reloadSeconds: -1 },
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assumptions: { mode: 'encounter' },
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stackingEffects: [{
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id: 'need-profile',
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trigger: { hitsRequired: 1, windowSeconds: 1 },
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lifecycle: { maxStacks: 1, durationSeconds: 1 },
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attributes: {}
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}]
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}));
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expect(result).toMatchObject({ status: 'INSUFFICIENT_DATA', hitValues: null, burstDps: null });
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expect(result.missing).toEqual(expect.arrayContaining([
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'weapon.rpm',
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'weapon.magazine',
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'weapon.reloadSeconds',
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'assumptions.hitRate',
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'assumptions.firingActivity',
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'assumptions.encounterSeconds'
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]));
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});
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});
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@@ -0,0 +1,405 @@
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export type CalculationStage =
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| 'flat_damage'
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| 'weapon_damage'
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| 'critical_chance'
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| 'critical_damage'
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| 'headshot_chance'
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| 'headshot_damage'
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| 'final_damage';
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export type CalculationOperator = 'add' | 'multiply';
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export type CurveType = 'none' | 'power' | 'smoothstep';
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export type AttributeBinding = {
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attributeId: string;
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stage: CalculationStage;
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operator: CalculationOperator;
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weight?: number;
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softCap?: number | null;
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hardCap?: number | null;
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curveType?: CurveType;
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curveParameter?: number | null;
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};
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export type StatValues = Record<string, number>;
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export type WeaponCombatInput = {
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baseDamage?: number;
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rpm?: number;
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magazine?: number;
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reloadSeconds?: number;
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headshotMultiplier?: number;
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};
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export type StackingMode = 'off' | 'peak' | 'encounter';
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export type TriggerRule = { hitsRequired: number; windowSeconds: number };
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export type StackLifecycle = { maxStacks: number; durationSeconds: number; stacksPerTrigger?: number };
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export type StackingEffect = {
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id: string;
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trigger: TriggerRule;
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lifecycle: StackLifecycle;
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attributes: StatValues;
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};
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export type CombatAssumptions = {
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mode: StackingMode;
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hitRate?: number;
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headshotRate?: number;
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firingActivity?: number;
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encounterSeconds?: number;
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perEffect?: Record<string, Partial<Omit<CombatAssumptions, 'perEffect'>>>;
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};
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export type MissingRequirement =
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| 'weapon.baseDamage'
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| 'weapon.rpm'
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| 'weapon.magazine'
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| 'weapon.reloadSeconds'
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| 'assumptions.hitRate'
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| 'assumptions.firingActivity'
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| 'assumptions.encounterSeconds'
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| `binding:${string}`;
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export type DamageValues = {
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normal: number;
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critical: number;
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headshot: number;
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criticalHeadshot: number;
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};
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export type StackSummary = {
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effectId: string;
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mode: StackingMode;
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stacksAtEnd: number;
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maxStacksReached: number;
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buildUpSeconds: number | null;
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averageStacks: number;
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maintained: boolean;
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};
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export type CombatCalculation = {
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status: 'OK' | 'INSUFFICIENT_DATA';
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missing: MissingRequirement[];
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hitValues: DamageValues | null;
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burstDps: number | null;
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sustainedDps: number | null;
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encounterDps: number | null;
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stackSummaries: StackSummary[];
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};
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export type CombatCalculationInput = {
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weapon: WeaponCombatInput;
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attributes: StatValues;
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bindings: AttributeBinding[];
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stageOrder?: CalculationStage[];
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stackingEffects?: StackingEffect[];
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assumptions: CombatAssumptions;
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};
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type ResolvedAssumptions = {
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mode: StackingMode;
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hitRate: number;
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headshotRate: number;
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firingActivity: number;
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encounterSeconds: number;
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};
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type StackState = {
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stacks: number;
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expiresAt: number;
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maxStacksReached: number;
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buildUpSeconds: number | null;
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};
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type TimedStackEffect = {
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effect: StackingEffect;
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assumptions: ResolvedAssumptions;
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events: number[];
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};
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const EPSILON = 0.000_001;
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const finitePositive = (value: unknown) => Number.isFinite(Number(value)) && Number(value) > 0;
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const finiteNonNegative = (value: unknown) => Number.isFinite(Number(value)) && Number(value) >= 0;
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const clamp = (value: number, low: number, high: number) => Math.min(high, Math.max(low, value));
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const percent = (value: unknown, fallback = 0) => clamp(Number.isFinite(Number(value)) ? Number(value) : fallback, 0, 100) / 100;
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function resolveAssumptions(base: CombatAssumptions, effectId: string): ResolvedAssumptions {
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const override = base.perEffect?.[effectId] ?? {};
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return {
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mode: override.mode ?? base.mode,
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hitRate: percent(override.hitRate ?? base.hitRate, 100),
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headshotRate: percent(override.headshotRate ?? base.headshotRate, 0),
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firingActivity: percent(override.firingActivity ?? base.firingActivity, 100),
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encounterSeconds: Number(override.encounterSeconds ?? base.encounterSeconds ?? 0)
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};
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}
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function transformedValue(raw: number, binding: AttributeBinding) {
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const weight = Number.isFinite(binding.weight) ? Number(binding.weight) : 1;
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const sign = raw < 0 ? -1 : 1;
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let value = Math.abs(raw * weight);
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const softCap = finiteNonNegative(binding.softCap) ? Number(binding.softCap) : null;
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const hardCap = finiteNonNegative(binding.hardCap) ? Number(binding.hardCap) : null;
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if (softCap !== null && value > softCap && binding.curveType && binding.curveType !== 'none') {
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const parameter = Math.max(0.01, Number(binding.curveParameter ?? 1));
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const overflow = value - softCap;
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if (binding.curveType === 'power') {
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value = softCap + overflow * Math.pow(softCap / Math.max(softCap + overflow, EPSILON), parameter);
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} else {
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const ceiling = hardCap ?? Math.max(softCap * 2, softCap + 1);
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const t = clamp(overflow / Math.max(ceiling - softCap, EPSILON), 0, 1);
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value = softCap + (ceiling - softCap) * (t * t * (3 - 2 * t));
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}
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}
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if (hardCap !== null) value = Math.min(value, hardCap);
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return value * sign;
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}
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function addAttributes(target: StatValues, incoming: StatValues, multiplier = 1) {
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for (const [id, value] of Object.entries(incoming)) {
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if (Number.isFinite(value)) target[id] = (target[id] ?? 0) + value * multiplier;
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}
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}
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function requiredData(input: CombatCalculationInput): MissingRequirement[] {
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const missing: MissingRequirement[] = [];
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if (!finitePositive(input.weapon.baseDamage)) missing.push('weapon.baseDamage');
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if (!finitePositive(input.weapon.rpm)) missing.push('weapon.rpm');
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if (!Number.isInteger(input.weapon.magazine) || Number(input.weapon.magazine) < 1) missing.push('weapon.magazine');
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if (!finiteNonNegative(input.weapon.reloadSeconds)) missing.push('weapon.reloadSeconds');
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const boundIds = new Set(input.bindings.map((binding) => binding.attributeId));
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for (const binding of input.bindings) {
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if (!Number.isFinite(input.attributes[binding.attributeId] ?? 0)) missing.push(`binding:${binding.attributeId}`);
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}
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if (input.assumptions.mode === 'encounter') {
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if (!finitePositive(input.assumptions.hitRate)) missing.push('assumptions.hitRate');
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if (!finitePositive(input.assumptions.firingActivity)) missing.push('assumptions.firingActivity');
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if (!finitePositive(input.assumptions.encounterSeconds)) missing.push('assumptions.encounterSeconds');
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}
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for (const effect of input.stackingEffects ?? []) {
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const assumptions = resolveAssumptions(input.assumptions, effect.id);
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if (assumptions.mode === 'encounter') {
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const override = input.assumptions.perEffect?.[effect.id];
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if (!finitePositive(override?.hitRate ?? input.assumptions.hitRate)) missing.push('assumptions.hitRate');
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if (!finitePositive(override?.firingActivity ?? input.assumptions.firingActivity)) missing.push('assumptions.firingActivity');
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if (!finitePositive(override?.encounterSeconds ?? input.assumptions.encounterSeconds)) missing.push('assumptions.encounterSeconds');
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}
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if (assumptions.mode !== 'off') for (const id of Object.keys(effect.attributes)) {
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if (!boundIds.has(id)) missing.push(`binding:${id}`);
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}
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}
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return [...new Set(missing)];
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}
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function stageValues(attributes: StatValues, bindings: AttributeBinding[], stage: CalculationStage) {
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let additive = 0;
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let multiplicative = 1;
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for (const binding of bindings.filter((item) => item.stage === stage)) {
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const value = transformedValue(Number(attributes[binding.attributeId] ?? 0), binding);
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if (binding.operator === 'add') additive += value;
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else multiplicative *= value;
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}
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return { additive, multiplicative };
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}
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function damageBase(
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weapon: Required<WeaponCombatInput>,
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attributes: StatValues,
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bindings: AttributeBinding[],
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stageOrder?: CalculationStage[]
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) {
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let damage = weapon.baseDamage;
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const order = stageOrder?.length
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? stageOrder
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: ['flat_damage', 'weapon_damage', 'final_damage'] satisfies CalculationStage[];
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for (const stage of order) {
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if (!['flat_damage', 'weapon_damage', 'final_damage'].includes(stage)) continue;
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const values = stageValues(attributes, bindings, stage);
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if (stage === 'flat_damage') damage = (damage + values.additive) * values.multiplicative;
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else damage *= (1 + values.additive / 100) * values.multiplicative;
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}
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return damage;
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}
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function hitValues(
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weapon: Required<WeaponCombatInput>,
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attributes: StatValues,
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bindings: AttributeBinding[],
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stageOrder?: CalculationStage[]
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): DamageValues {
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const normal = damageBase(weapon, attributes, bindings, stageOrder);
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const critical = stageValues(attributes, bindings, 'critical_damage');
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const headshot = stageValues(attributes, bindings, 'headshot_damage');
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const criticalFactor = (1 + critical.additive / 100) * critical.multiplicative;
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const headshotFactor = weapon.headshotMultiplier * (1 + headshot.additive / 100) * headshot.multiplicative;
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return {
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normal,
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critical: normal * criticalFactor,
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headshot: normal * headshotFactor,
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criticalHeadshot: normal * criticalFactor * headshotFactor
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};
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}
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function dpsFor(
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weapon: Required<WeaponCombatInput>,
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attributes: StatValues,
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bindings: AttributeBinding[],
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assumptions: ResolvedAssumptions,
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stageOrder?: CalculationStage[]
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) {
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const values = hitValues(weapon, attributes, bindings, stageOrder);
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const critical = stageValues(attributes, bindings, 'critical_chance');
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const boundCriticalChance = clamp(critical.additive / 100, 0, 1);
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const configuredHeadshot = stageValues(attributes, bindings, 'headshot_chance');
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const boundHeadshotChance = clamp(configuredHeadshot.additive / 100, 0, 1);
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const headshotChance = assumptions.headshotRate || boundHeadshotChance;
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const average = values.normal * (1 - boundCriticalChance) * (1 - headshotChance)
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+ values.critical * boundCriticalChance * (1 - headshotChance)
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+ values.headshot * (1 - boundCriticalChance) * headshotChance
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+ values.criticalHeadshot * boundCriticalChance * headshotChance;
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const shotsPerSecond = weapon.rpm / 60;
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return {
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values,
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burst: average * shotsPerSecond,
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sustained: average * weapon.magazine / (weapon.magazine / shotsPerSecond + weapon.reloadSeconds)
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};
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}
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function triggerEvents(weapon: Required<WeaponCombatInput>, effect: StackingEffect, assumptions: ResolvedAssumptions) {
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if (assumptions.mode !== 'encounter' || effect.trigger.hitsRequired < 1 || effect.trigger.windowSeconds <= 0) return [];
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const shotInterval = (60 / weapon.rpm) / Math.max(assumptions.firingActivity, EPSILON);
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let magazineRemaining = weapon.magazine;
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let expectedHits = 0;
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let counterStartedAt = 0;
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const events: number[] = [];
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for (let time = 0; time <= assumptions.encounterSeconds + EPSILON;) {
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if (magazineRemaining === 0) {
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time += weapon.reloadSeconds;
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magazineRemaining = weapon.magazine;
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if (time - counterStartedAt > effect.trigger.windowSeconds) {
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expectedHits = 0;
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counterStartedAt = time;
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}
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continue;
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}
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if (expectedHits === 0) counterStartedAt = time;
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expectedHits += assumptions.hitRate;
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magazineRemaining -= 1;
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if (time - counterStartedAt > effect.trigger.windowSeconds) {
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expectedHits = assumptions.hitRate;
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counterStartedAt = time;
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}
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if (expectedHits + EPSILON >= effect.trigger.hitsRequired) {
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events.push(time);
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expectedHits = 0;
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counterStartedAt = time;
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}
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time += shotInterval;
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}
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return events;
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}
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function stateAt(effect: TimedStackEffect, time: number): StackState {
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if (effect.assumptions.mode === 'off') {
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return { stacks: 0, expiresAt: 0, maxStacksReached: 0, buildUpSeconds: null };
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}
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if (effect.assumptions.mode === 'peak') {
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return {
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stacks: effect.effect.lifecycle.maxStacks,
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expiresAt: Infinity,
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maxStacksReached: effect.effect.lifecycle.maxStacks,
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buildUpSeconds: 0
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};
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}
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const state: StackState = { stacks: 0, expiresAt: 0, maxStacksReached: 0, buildUpSeconds: null };
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for (const eventTime of effect.events) {
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if (eventTime - time > EPSILON) break;
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if (eventTime - state.expiresAt > EPSILON) state.stacks = 0;
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state.stacks = Math.min(
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effect.effect.lifecycle.maxStacks,
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state.stacks + Math.max(1, effect.effect.lifecycle.stacksPerTrigger ?? 1)
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);
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state.expiresAt = eventTime + effect.effect.lifecycle.durationSeconds;
|
||||
state.maxStacksReached = Math.max(state.maxStacksReached, state.stacks);
|
||||
if (state.stacks === effect.effect.lifecycle.maxStacks && state.buildUpSeconds === null) {
|
||||
state.buildUpSeconds = eventTime;
|
||||
}
|
||||
}
|
||||
if (time - state.expiresAt > EPSILON) state.stacks = 0;
|
||||
return state;
|
||||
}
|
||||
|
||||
function stackAttributes(base: StatValues, effects: TimedStackEffect[], time: number) {
|
||||
const result = { ...base };
|
||||
for (const effect of effects) addAttributes(result, effect.effect.attributes, stateAt(effect, time).stacks);
|
||||
return result;
|
||||
}
|
||||
|
||||
export function calculateCombat(input: CombatCalculationInput): CombatCalculation {
|
||||
const missing = requiredData(input);
|
||||
if (missing.length) {
|
||||
return {
|
||||
status: 'INSUFFICIENT_DATA',
|
||||
missing,
|
||||
hitValues: null,
|
||||
burstDps: null,
|
||||
sustainedDps: null,
|
||||
encounterDps: null,
|
||||
stackSummaries: []
|
||||
};
|
||||
}
|
||||
const weapon: Required<WeaponCombatInput> = {
|
||||
baseDamage: Number(input.weapon.baseDamage),
|
||||
rpm: Number(input.weapon.rpm),
|
||||
magazine: Number(input.weapon.magazine),
|
||||
reloadSeconds: Number(input.weapon.reloadSeconds),
|
||||
headshotMultiplier: Number(input.weapon.headshotMultiplier ?? 2)
|
||||
};
|
||||
const effects: TimedStackEffect[] = (input.stackingEffects ?? []).map((effect) => {
|
||||
const assumptions = resolveAssumptions(input.assumptions, effect.id);
|
||||
return { effect, assumptions, events: triggerEvents(weapon, effect, assumptions) };
|
||||
});
|
||||
const globalAssumptions = resolveAssumptions(input.assumptions, '');
|
||||
const finalTime = Math.max(
|
||||
globalAssumptions.encounterSeconds,
|
||||
...effects.filter((effect) => effect.assumptions.mode === 'encounter').map((effect) => effect.assumptions.encounterSeconds)
|
||||
);
|
||||
const current = dpsFor(
|
||||
weapon,
|
||||
stackAttributes(input.attributes, effects, finalTime),
|
||||
input.bindings,
|
||||
globalAssumptions,
|
||||
input.stageOrder
|
||||
);
|
||||
let encounterDps: number | null = null;
|
||||
if (effects.some((effect) => effect.assumptions.mode === 'encounter') && finalTime > 0) {
|
||||
const steps = Math.max(30, Math.min(600, Math.ceil(finalTime * 4)));
|
||||
let total = 0;
|
||||
for (let index = 0; index < steps; index += 1) {
|
||||
const time = finalTime * (index + 0.5) / steps;
|
||||
const result = dpsFor(
|
||||
weapon,
|
||||
stackAttributes(input.attributes, effects, time),
|
||||
input.bindings,
|
||||
globalAssumptions,
|
||||
input.stageOrder
|
||||
);
|
||||
total += result.sustained * globalAssumptions.firingActivity;
|
||||
}
|
||||
encounterDps = total / steps;
|
||||
}
|
||||
return {
|
||||
status: 'OK',
|
||||
missing: [],
|
||||
hitValues: current.values,
|
||||
burstDps: current.burst,
|
||||
sustainedDps: current.sustained,
|
||||
encounterDps,
|
||||
stackSummaries: effects.map((item) => {
|
||||
const end = stateAt(item, finalTime);
|
||||
const duration = item.assumptions.mode === 'encounter' ? item.assumptions.encounterSeconds : 0;
|
||||
const samples = item.assumptions.mode === 'encounter' && duration > 0 ? 100 : 1;
|
||||
let sum = 0;
|
||||
for (let index = 0; index < samples; index += 1) {
|
||||
sum += stateAt(item, duration * (index + 0.5) / samples).stacks;
|
||||
}
|
||||
return {
|
||||
effectId: item.effect.id,
|
||||
mode: item.assumptions.mode,
|
||||
stacksAtEnd: end.stacks,
|
||||
maxStacksReached: end.maxStacksReached,
|
||||
buildUpSeconds: end.buildUpSeconds,
|
||||
averageStacks: sum / samples,
|
||||
maintained: end.maxStacksReached === item.effect.lifecycle.maxStacks
|
||||
&& (item.assumptions.mode === 'peak' || end.stacks > 0)
|
||||
};
|
||||
})
|
||||
};
|
||||
}
|
||||
Reference in New Issue
Block a user