import { describe, expect, test } from "bun:test";
import {
	dedupeKey,
	parseTitle,
	pickBestRelease,
} from "../src/engine/titles.js";

describe("parseTitle", () => {
	test("strips No-Intro tags and keeps region + revision metadata", () => {
		const p = parseTitle("Chrono Trigger (USA) (Rev 1) [!]");
		expect(p.displayTitle).toBe("Chrono Trigger");
		expect(p.noIntroName).toBe("Chrono Trigger (USA) (Rev 1) [!]");
		expect(p.region).toBe("USA");
		expect(p.revision).toBe("Rev 1");
	});

	test("normalises a trailing article", () => {
		expect(parseTitle("Legend of Zelda, The (USA)").displayTitle).toBe(
			"The Legend of Zelda",
		);
	});

	test("recognises multi-region tags", () => {
		const p = parseTitle("Sonic (USA, Europe)");
		expect(p.regions).toEqual(["USA", "Europe"]);
		expect(p.region).toBe("USA");
	});

	test("converts underscores and collapses whitespace", () => {
		expect(parseTitle("Super_Mario__World").displayTitle).toBe(
			"Super Mario World",
		);
	});

	test("a tagless name is its own title", () => {
		const p = parseTitle("Tetris");
		expect(p.displayTitle).toBe("Tetris");
		expect(p.region).toBeUndefined();
	});
});

describe("region dedupe", () => {
	test("groups by base title", () => {
		expect(dedupeKey(parseTitle("Sonic (USA)"))).toBe(
			dedupeKey(parseTitle("Sonic (Europe)")),
		);
	});

	test("pickBestRelease honors region priority, then shortest name", () => {
		const items = [
			{ parsed: parseTitle("Sonic (Europe)") },
			{ parsed: parseTitle("Sonic (USA)") },
			{ parsed: parseTitle("Sonic (Japan)") },
		];
		const best = pickBestRelease(items, ["USA", "World", "Europe", "Japan"]);
		expect(best.parsed.region).toBe("USA");
	});

	test("falls back to shortest name when no region matches priority", () => {
		const items = [
			{ parsed: parseTitle("Game (Korea) (Beta)") },
			{ parsed: parseTitle("Game (Korea)") },
		];
		const best = pickBestRelease(items, ["USA"]);
		expect(best.parsed.noIntroName).toBe("Game (Korea)");
	});
});