deadhead-space-freight-tycoon/packages/sim/test/reach-table.test.ts

import { content } from "@deadhead/content";
import { describe, expect, it } from "vitest";
import { checkRoute, fullTankReach, wouldStrand } from "../src/index";

/**
 * CR-015 §4: reach for base ships on the fixed map, a plain yes or no per leg
 * (decision 0.5.81 as amended). Replaces CR-012's date-sampled table.
 */
const NAMES: Record<string, string> = {
  earth: "Earth",
  moon: "Moon",
  mars: "Mars",
  "ceres-station": "Ceres",
  "jupiter-cloud-platform": "Jupiter",
};
const ids = Object.keys(NAMES);

function reaches(modelId: string, fromId: string, toId: string): boolean {
  const ship = content.shipModel(modelId)!;
  return checkRoute(ship, content.location(fromId)!, content.location(toId)!, content.config).ok;
}

/** [model, from, to] for every leg the table says yes or no to. */
type Leg = [string, string, string];
const both = (model: string, a: string, b: string): Leg[] => [
  [model, a, b],
  [model, b, a],
];
const toJupiterFromAnywhere = (model: string): Leg[] =>
  ids
    .filter((id) => id !== "jupiter-cloud-platform")
    .map((from) => [model, from, "jupiter-cloud-platform"]);

const yes: Leg[] = [
  ...both("courier", "earth", "moon"),
  ...both("lighter", "earth", "moon"),
  ...both("clipper", "earth", "moon"),
  ...both("clipper", "earth", "mars"),
  ["clipper", "moon", "mars"],
  ["clipper", "mars", "ceres-station"],
  // The Freighter does everything the Clipper does, plus Earth↔Ceres and Ceres↔Jupiter.
  ...both("freighter", "earth", "moon"),
  ...both("freighter", "earth", "mars"),
  ["freighter", "moon", "mars"],
  ["freighter", "mars", "ceres-station"],
  ...both("freighter", "earth", "ceres-station"),
  ...both("freighter", "ceres-station", "jupiter-cloud-platform"),
  ...ids.flatMap((from) =>
    ids.filter((to) => to !== from).map((to): Leg => ["bulk-hauler", from, to]),
  ),
];

const no: Leg[] = [
  ["courier", "earth", "mars"],
  ["courier", "moon", "mars"],
  ["lighter", "earth", "mars"],
  ["lighter", "moon", "mars"],
  ["clipper", "earth", "ceres-station"],
  ["clipper", "moon", "ceres-station"],
  ...toJupiterFromAnywhere("clipper"),
  ["freighter", "earth", "jupiter-cloud-platform"],
  ["freighter", "moon", "jupiter-cloud-platform"],
  ["freighter", "mars", "jupiter-cloud-platform"],
];

const label = ([model, from, to]: Leg) => `${model} ${NAMES[from]}→${NAMES[to]}`;

describe("reach table (CR-015 §4)", () => {
  it.each(yes.map((leg) => [label(leg), leg] as const))("yes: %s", (_name, [m, from, to]) => {
    expect(reaches(m, from, to)).toBe(true);
  });

  it.each(no.map((leg) => [label(leg), leg] as const))("no: %s", (_name, [m, from, to]) => {
    expect(reaches(m, from, to)).toBe(false);
  });
});

/** CR-016 §3: additions for Venus and the Jupiter system (decision 0.5.102). */
const NEW_NAMES: Record<string, string> = {
  "venus-cloud-city": "Venus",
  "io-sulfur-works": "Io",
  "europa-ice-station": "Europa",
};
const allNames = { ...NAMES, ...NEW_NAMES };
const allIds = Object.keys(allNames);
const label16 = ([model, from, to]: Leg) => `${model} ${allNames[from]}→${allNames[to]}`;

const loop = ["jupiter-cloud-platform", "io-sulfur-works", "europa-ice-station"];
const localLoop = (model: string): Leg[] =>
  loop.flatMap((from) => loop.filter((to) => to !== from).map((to): Leg => [model, from, to]));
const inner = ["earth", "moon", "mars", "venus-cloud-city"];
const innerToJupiterSystem = (model: string): Leg[] =>
  inner.flatMap((from) => loop.map((to): Leg => [model, from, to]));

const yes16: Leg[] = [
  ...localLoop("courier"),
  ...localLoop("lighter"),
  ...both("clipper", "earth", "venus-cloud-city"),
  ["clipper", "moon", "venus-cloud-city"],
  ...localLoop("clipper"),
  // The Freighter does everything the Clipper does, plus these.
  ...both("freighter", "earth", "venus-cloud-city"),
  ["freighter", "moon", "venus-cloud-city"],
  ...localLoop("freighter"),
  ["freighter", "venus-cloud-city", "mars"],
  ...both("freighter", "ceres-station", "io-sulfur-works"),
  ...both("freighter", "ceres-station", "europa-ice-station"),
  ...allIds.flatMap((from) =>
    allIds.filter((to) => to !== from).map((to): Leg => ["bulk-hauler", from, to]),
  ),
];

const no16: Leg[] = [
  ["courier", "earth", "venus-cloud-city"],
  ["courier", "moon", "venus-cloud-city"],
  ["lighter", "earth", "venus-cloud-city"],
  ["lighter", "moon", "venus-cloud-city"],
  ["clipper", "venus-cloud-city", "mars"],
  ...innerToJupiterSystem("clipper"),
  ["freighter", "venus-cloud-city", "ceres-station"],
  ...innerToJupiterSystem("freighter"),
];

describe("reach additions (CR-016 §3)", () => {
  it.each(yes16.map((leg) => [label16(leg), leg] as const))("yes: %s", (_name, [m, from, to]) => {
    expect(reaches(m, from, to)).toBe(true);
  });

  it.each(no16.map((leg) => [label16(leg), leg] as const))("no: %s", (_name, [m, from, to]) => {
    expect(reaches(m, from, to)).toBe(false);
  });

  it("gives the Bulk Hauler at least 900M km on a full tank", () => {
    const bulk = content.shipModel("bulk-hauler")!;
    expect(fullTankReach(bulk, content.location("earth")!, content.config)).toBeGreaterThanOrEqual(
      900,
    );
  });

  it("lets a Courier at Jupiter's platform fly to Io and Europa and back, without stranding", () => {
    const courier = content.shipModel("courier")!;
    const all = new Set(allIds);
    for (const moon of ["io-sulfur-works", "europa-ice-station"]) {
      for (const [from, to] of [
        ["jupiter-cloud-platform", moon],
        [moon, "jupiter-cloud-platform"],
      ] as const) {
        expect(reaches("courier", from, to), `${from}→${to}`).toBe(true);
        expect(wouldStrand(courier, content.location(to)!, 0, all, content)).toBe(false);
      }
    }
  });
});