import { describe, expect, it } from "vitest";
import { chunkUnits, loadTypeScript, splitSourceUnits } from "./jev-find-source.ts";

describe("TS7 source parser", () => {
	it("keeps UTF-16 names and CRLF line positions", async () => {
		const parser = await loadTypeScript();
		expect(parser).toBeDefined();
		const text = '// 😀 header\r\nexport const café = "😀";\r\n\r\nexport function retry() { return café; }\r\n';
		expect(splitSourceUnits("sample.ts", text, parser)).toEqual([
			{ name: "café", start: 1, end: 2 },
			{ name: "retry", start: 4, end: 4 },
		]);
	});

	it("parses TSX from the supplied text without needing a physical file", async () => {
		const parser = await loadTypeScript();
		const text = "export function View() { return <div>ready</div>; }\n";
		expect(splitSourceUnits("not-on-disk.tsx", text, parser)).toEqual([{ name: "View", start: 1, end: 1 }]);
	});

	it("retains deterministic chunks if the optional native parser fails", () => {
		const text = "const x = 1;\n\nconst y = 2;\n";
		expect(splitSourceUnits("sample.ts", text, { sourceUnits() { throw new Error("parser unavailable"); } })).toEqual(chunkUnits(text));
		expect(splitSourceUnits("sample.ts", text, undefined)).toEqual(chunkUnits(text));
	});
});