galaxy-game/ui/frontend/tests/state-binding.test.ts

// Vitest unit coverage for `map/state-binding.ts`. The function
// translates a Phase 11 `GameReport` into a renderer-ready `World`
// containing one Point primitive per planet across all four kinds
// (local / other / uninhabited / unidentified). The tests assert
// the world dimensions match the report, the planet ids are the
// engine numbers, the kind-specific styles differ, and a zero-planet
// report still produces a well-formed empty World.

import "@testing-library/jest-dom/vitest";
import { describe, expect, test } from "vitest";

import type { GameReport } from "../src/api/game-state";
import { reportToWorld } from "../src/map/state-binding";

function makeReport(overrides: Partial<GameReport> = {}): GameReport {
	return {
		turn: 1,
		mapWidth: 4000,
		mapHeight: 4000,
		planetCount: 0,
		planets: [],
		...overrides,
	};
}

describe("reportToWorld", () => {
	test("uses report dimensions for the World", () => {
		const world = reportToWorld(makeReport({ mapWidth: 3200, mapHeight: 1600 }));
		expect(world.width).toBe(3200);
		expect(world.height).toBe(1600);
	});

	test("emits one Point primitive per planet across all four kinds", () => {
		const world = reportToWorld(
			makeReport({
				planets: [
					{ number: 1, name: "Home", x: 100, y: 100, kind: "local", owner: null, size: 12, resources: 0.5 },
					{ number: 2, name: "Alpha", x: 200, y: 100, kind: "other", owner: "Federation", size: 8, resources: 0.3 },
					{ number: 3, name: "Rock", x: 100, y: 200, kind: "uninhabited", owner: null, size: 4, resources: 0.1 },
					{ number: 4, name: "", x: 200, y: 200, kind: "unidentified", owner: null, size: null, resources: null },
				],
			}),
		);
		expect(world.primitives.length).toBe(4);
		for (const p of world.primitives) {
			expect(p.kind).toBe("point");
		}
	});

	test("propagates planet number as primitive id and coordinates verbatim", () => {
		const world = reportToWorld(
			makeReport({
				planets: [
					{ number: 42, name: "Home", x: 123.5, y: 456.25, kind: "local", owner: null, size: 10, resources: 0.5 },
				],
			}),
		);
		const [planet] = world.primitives;
		expect(planet?.id).toBe(42);
		expect(planet?.kind).toBe("point");
		if (planet?.kind === "point") {
			expect(planet.x).toBe(123.5);
			expect(planet.y).toBe(456.25);
		}
	});

	test("uses distinct styles for each planet kind", () => {
		const world = reportToWorld(
			makeReport({
				planets: [
					{ number: 1, name: "L", x: 0, y: 0, kind: "local", owner: null, size: 1, resources: 0 },
					{ number: 2, name: "O", x: 1, y: 0, kind: "other", owner: "Foe", size: 1, resources: 0 },
					{ number: 3, name: "U", x: 2, y: 0, kind: "uninhabited", owner: null, size: 1, resources: 0 },
					{ number: 4, name: "?", x: 3, y: 0, kind: "unidentified", owner: null, size: null, resources: null },
				],
			}),
		);
		const fills = world.primitives.map((p) => p.style.fillColor);
		const unique = new Set(fills);
		expect(unique.size).toBe(fills.length);
	});

	test("zero-planet report yields an empty primitive list and well-formed World", () => {
		const world = reportToWorld(makeReport({ planets: [] }));
		expect(world.primitives.length).toBe(0);
		expect(world.width).toBeGreaterThan(0);
		expect(world.height).toBeGreaterThan(0);
	});

	test("guards against zero / negative dimensions in the report", () => {
		const world = reportToWorld(
			makeReport({ mapWidth: 0, mapHeight: -1, planets: [] }),
		);
		// World's constructor rejects non-positive dimensions; the
		// binding falls back to 1×1 so a malformed report cannot crash
		// the renderer.
		expect(world.width).toBeGreaterThan(0);
		expect(world.height).toBeGreaterThan(0);
	});

	test("local planets carry higher priority than unidentified", () => {
		const world = reportToWorld(
			makeReport({
				planets: [
					{ number: 1, name: "Home", x: 0, y: 0, kind: "local", owner: null, size: 1, resources: 0 },
					{ number: 2, name: "?", x: 0, y: 0, kind: "unidentified", owner: null, size: null, resources: null },
				],
			}),
		);
		const local = world.primitives.find((p) => p.id === 1);
		const unknown = world.primitives.find((p) => p.id === 2);
		expect(local?.priority ?? 0).toBeGreaterThan(unknown?.priority ?? 0);
	});
});