import { describe, expect, it } from "vitest";
import { detectGoProject } from "./detect-go-project.ts";
import type { ProjectProbe } from "../ports/project-probe.ts";

function probeWithExistingPaths(existingPaths: string[]): ProjectProbe {
	const existing = new Set(existingPaths);

	return {
		async exists(path: string): Promise<boolean> {
			return existing.has(path);
		},
	};
}

describe("detectGoProject", () => {
	const cwd = "/workspace/service";

	it("detects a Go module from go.mod", async () => {
		const candidate = await detectGoProject({
			cwd,
			probe: probeWithExistingPaths(["/workspace/service/go.mod"]),
		});

		expect(candidate).toMatchObject({
			language: "go",
			root: cwd,
			confidence: "high",
		});
		expect(candidate?.reason).toContain("go.mod");
	});

	it("detects a Go workspace from go.work", async () => {
		const candidate = await detectGoProject({
			cwd,
			probe: probeWithExistingPaths(["/workspace/service/go.work"]),
		});

		expect(candidate).toMatchObject({
			language: "go",
			root: cwd,
			confidence: "high",
		});
		expect(candidate?.reason).toContain("go.work");
	});

	it("does not detect Go when neither go.mod nor go.work is present", async () => {
		const candidate = await detectGoProject({
			cwd,
			probe: probeWithExistingPaths([]),
		});

		expect(candidate).toBeUndefined();
	});
});