import getVersion, { getRequiredNodeVersion } from "./version";
import fs, { PathLike } from "fs";
import path from "path";

describe("version", () => {
  describe("getVersion", () => {
    it("should read correct version from package.json", function() {
      const expectedVersion = "1.1.28";
      const expectedPath = path.resolve(__dirname, "../package.json");

      const mock = jest.spyOn(fs, "readFileSync");
      // mock only once, otherwise we break the whole test runner
      mock.mockImplementationOnce((path: PathLike | number, options?: { encoding?: string | null; flag?: string } | string | null) => {
        expect(path).toBe(expectedPath);
        expect(options).toBeDefined();
        expect(typeof options).toBe("object");
        const opt = options as {encoding: string};
        expect(opt.encoding).toBe("utf8");

        const fakeJson = {
          version: expectedVersion,
        };

        return JSON.stringify(fakeJson, null, 4); // pretty print
      });

      const version = getVersion();
      expect(version).toBe(expectedVersion);
    });
  });

  describe("getRequiredNodeVersion", () => {
    it("should read correct node version from package.json", function() {
      const expectedVersion = ">=10.17.0";
      const expectedPath = path.resolve(__dirname, "../package.json");

      const mock = jest.spyOn(fs, "readFileSync");
      // mock only once, otherwise we break the whole test runner
      mock.mockImplementationOnce((path: PathLike | number, options?: { encoding?: string | null; flag?: string } | string | null) => {
        expect(path).toBe(expectedPath);
        expect(options).toBeDefined();
        expect(typeof options).toBe("object");
        const opt = options as {encoding: string};
        expect(opt.encoding).toBe("utf8");

        const fakeJson = {
          engines: {
            node: expectedVersion,
          },
        };

        return JSON.stringify(fakeJson, null, 4); // pretty print
      });

      const version = getRequiredNodeVersion();
      expect(version).toBe(expectedVersion);
    });
  });
});