import { describe, test, expect } from "vitest";
import { generatePostSynthBarrel, type BarrelEntry } from "./generate-post-synth-barrel";

describe("generatePostSynthBarrel", () => {
  test("emits a DO NOT EDIT banner, static imports, and an id-sorted array", () => {
    const entries: BarrelEntry[] = [
      { module: "./gha021", exportName: "gha021", id: "GHA021" },
      { module: "./apt-no-recommends", exportName: "dkrd010", id: "DKRD010" },
      { module: "./gha006", exportName: "gha006", id: "GHA006" },
    ];
    const out = generatePostSynthBarrel(entries);

    expect(out).toContain("// Code generated by chant generate. DO NOT EDIT.");
    expect(out).toContain('import type { PostSynthCheck } from "@intentius/chant/lint/post-synth";');
    // Export name may differ from the module name (docker/helm/temporal).
    expect(out).toContain('import { dkrd010 } from "./apt-no-recommends";');
    // Array is ordered by id, not insertion order.
    const arrayBody = out.slice(out.indexOf("postSynthChecks: PostSynthCheck[] = ["));
    expect(arrayBody.indexOf("dkrd010")).toBeLessThan(arrayBody.indexOf("gha006"));
    expect(arrayBody.indexOf("gha006")).toBeLessThan(arrayBody.indexOf("gha021"));
  });

  test("is deterministic regardless of input order", () => {
    const a: BarrelEntry[] = [
      { module: "./b", exportName: "b", id: "X2" },
      { module: "./a", exportName: "a", id: "X1" },
    ];
    const b = [...a].reverse();
    expect(generatePostSynthBarrel(a)).toBe(generatePostSynthBarrel(b));
  });

  test("empty input yields an empty array, still valid", () => {
    const out = generatePostSynthBarrel([]);
    expect(out).toContain("export const postSynthChecks: PostSynthCheck[] = [");
    expect(out).toContain("];");
  });
});