126 lines
4.6 KiB
TypeScript
126 lines
4.6 KiB
TypeScript
import {
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upgradeMaxLevel,
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upgradePercentPerLevel,
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type GameConfig,
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type ShipModel,
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type Upgrade,
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} from "@deadhead/content";
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import { MS_PER_MINUTE, type RealTime } from "./clock";
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import type { ShipState } from "./dispatch";
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/** Installed upgrade levels by upgrade id; a missing upgrade is level 0. */
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export type UpgradeLevels = Readonly<Record<string, number>>;
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/**
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* A ship's stats after upgrades (decision 0.5.63): its model with the four
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* upgradable model stats adjusted, plus its own handling time per tonne.
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*/
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export interface EffectiveStats extends ShipModel {
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handlingGameHoursPerTonne: number;
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}
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/**
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* Applies installed upgrades to a model's base stats: each level adds the
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* upgrade's percent (after model overrides) of the base stat, linearly.
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* Levels above the model's max for an upgrade are clamped.
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*/
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export function effectiveStats(
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model: ShipModel,
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levels: UpgradeLevels,
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content: { upgrades: readonly Upgrade[]; config: GameConfig },
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): EffectiveStats {
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const stats: EffectiveStats = {
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...model,
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handlingGameHoursPerTonne: content.config.handlingGameHoursPerTonne,
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};
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for (const upgrade of content.upgrades) {
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const level = Math.min(levels[upgrade.id] ?? 0, upgradeMaxLevel(upgrade, model.id));
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if (level <= 0) continue;
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const base = stats[upgrade.stat];
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stats[upgrade.stat] = base * (1 + (upgradePercentPerLevel(upgrade, model.id) * level) / 100);
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}
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return stats;
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}
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/** Whether a ship is in the upgrade shop at real time `now` (until, not at, in-shop-until). */
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export function isInShop(ship: Pick<ShipState, "inShopUntil">, now: RealTime): boolean {
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return ship.inShopUntil != null && now < ship.inShopUntil;
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}
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/** The next level an upgrade would reach on a ship, or null when it is maxed. */
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export function nextUpgradeLevel(
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upgrade: Upgrade,
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modelId: string,
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levels: UpgradeLevels,
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): number | null {
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const next = (levels[upgrade.id] ?? 0) + 1;
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return next > upgradeMaxLevel(upgrade, modelId) ? null : next;
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}
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/** Cost of an upgrade level: a percent of the ship model's price, in whole credits. */
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export function upgradeCost(model: ShipModel, level: number, config: GameConfig): number {
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const entry = config.upgradeLevels[level - 1];
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if (!entry) throw new Error(`No upgrade level ${level}`);
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return Math.round((model.price * entry.costPercentOfPrice) / 100);
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}
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/** Real milliseconds a ship spends in the shop for an upgrade level. */
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export function upgradeShopMs(level: number, config: GameConfig): number {
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const entry = config.upgradeLevels[level - 1];
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if (!entry) throw new Error(`No upgrade level ${level}`);
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return entry.shopRealMinutes * MS_PER_MINUTE;
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}
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/** Every reason `validateUpgrade` can fail, in check order (decisions 0.5.64, 0.5.65). */
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export const UPGRADE_FAILURES = [
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"tutorial-active",
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"not-upgradable",
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"ship-not-idle",
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"ship-in-shop",
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"not-at-hq",
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"upgrade-maxed",
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"insufficient-funds",
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] as const;
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export type UpgradeFailure = (typeof UPGRADE_FAILURES)[number];
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export interface UpgradeProposal {
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ship: ShipState;
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upgrade: Upgrade;
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/** Whether the player has a bay where the ship is. */
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atHq: boolean;
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tutorialActive: boolean;
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credits: number;
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now: RealTime;
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}
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export type UpgradeCheck =
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| { ok: true; level: number; cost: number; shopUntil: RealTime }
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| { ok: false; reason: UpgradeFailure };
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/**
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* Validates starting one level of an upgrade (decisions 0.5.64–0.5.66): tutorial
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* over, a purchasable model (not the loaner), idle and out of the shop, at an HQ,
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* not maxed, affordable. On success, gives the new level, its cost and when the
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* ship leaves the shop.
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*/
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export function validateUpgrade(
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proposal: UpgradeProposal,
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content: { shipModels: readonly ShipModel[]; config: GameConfig },
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): UpgradeCheck {
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const { ship, upgrade, atHq, tutorialActive, credits, now } = proposal;
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const fail = (reason: UpgradeFailure): UpgradeCheck => ({ ok: false, reason });
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const model = content.shipModels.find((m) => m.id === ship.modelId);
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if (!model) throw new Error(`Unknown ship model ${ship.modelId}`);
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if (tutorialActive) return fail("tutorial-active");
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if (!model.purchasable) return fail("not-upgradable");
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if (ship.inFlight) return fail("ship-not-idle");
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if (isInShop(ship, now)) return fail("ship-in-shop");
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if (!atHq) return fail("not-at-hq");
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const level = nextUpgradeLevel(upgrade, model.id, ship.upgrades ?? {});
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if (level === null) return fail("upgrade-maxed");
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const cost = upgradeCost(model, level, content.config);
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if (credits < cost) return fail("insufficient-funds");
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return { ok: true, level, cost, shopUntil: now + upgradeShopMs(level, content.config) };
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}
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