import { readFileSync } from "node:fs";
import { describe, expect, it } from "vitest";

const dockerfile = readFileSync("Dockerfile", "utf8");

describe("Docker build cache", () => {
	it("installs frozen dependencies before copying application source", () => {
		const manifests = dockerfile.indexOf(
			"COPY package.json *lock* pnpm-workspace.yaml .npmrc ./",
		);
		const install = dockerfile.indexOf("pnpm install --frozen-lockfile");
		const source = dockerfile.indexOf("COPY . .");
		expect(manifests).toBeGreaterThan(-1);
		expect(install).toBeGreaterThan(manifests);
		expect(source).toBeGreaterThan(install);
	});
	it("retains the package store and Next compiler cache across source changes", () => {
		expect(dockerfile).toContain("id=epicnext-pnpm,target=/pnpm/store");
		expect(dockerfile).toContain("--store-dir=/pnpm/store");
		expect(dockerfile).toContain("id=epicnext-next,target=/app/.next/cache");
	});
	it("ships standalone output without a redundant dependency pruning step", () => {
		expect(dockerfile).toContain("/app/.next/standalone ./");
		expect(dockerfile).not.toContain("pnpm prune --prod");
		expect(dockerfile).not.toContain("npm prune --production");
		expect(dockerfile).not.toContain("yarn install --production");
	});
});