const assert = require("assert");
const Config = require("../../../src/config/configuration");

describe("Config", () => {
  beforeEach(() => {
    this.backedUpEnvironmentVariables = { ...process.env };
    this.backedUpConfigFields = { ...Config.getInstance().fields };
  });

  afterEach(() => {
    process.env = this.backedUpEnvironmentVariables;
    Config.getInstance().fields = this.backedUpConfigFields;
  });

  it("should retrieve section and option from config file", () => {
    Config.getInstance().fields = { webserver: { port: 1337 } };
    assert.equal(Config.getInstance().get("webserver", "port"), 1337);
  });

  it("should resolve to environment variables if option is filtered with env", () => {
    Config.getInstance().fields = {
      webserver: { port: "env|SEASONED_WEBSERVER_PORT" }
    };
    process.env.SEASONED_WEBSERVER_PORT = "1338";
    assert.equal(Config.getInstance().get("webserver", "port"), 1338);
  });

  it("raises an exception if the environment variable does not exist", () => {
    Config.getInstance().fields = { webserver: { port: "env|DOES_NOT_EXIST" } };
    process.env.SEASONED_WEBSERVER_PORT = "1338";
    assert.throws(() => Config.getInstance().get("webserver", "port"), /empty/);
  });

  it("raises an exception if the environment variable is empty", () => {
    Config.getInstance().fields = {
      webserver: { port: "env|SEASONED_WEBSERVER_PORT" }
    };
    process.env.SEASONED_WEBSERVER_PORT = "";
    assert.throws(() => Config.getInstance().get("webserver", "port"), /empty/);
  });

  it("raises an exception if the section does not exist in the file", () => {
    Config.getInstance().fields = { webserver: { port: "1338" } };
    assert.throws(
      () => Config.getInstance().get("woops", "port"),
      /does not exist/
    );
  });

  it("raises an exception if the option does not exist in the file", () => {
    Config.getInstance().fields = { webserver: { port: "1338" } };
    assert.throws(
      () => Config.getInstance().get("webserver", "woops"),
      /does not exist/
    );
  });

  it("returns an array if field is an array", () => {
    Config.getInstance().fields = { bouncer: { whitelist: [1, 2, 3] } };
    assert.deepEqual(
      Config.getInstance().get("bouncer", "whitelist"),
      [1, 2, 3]
    );
  });

  it("decodes field as base64 if base64| is before the variable", () => {
    Config.getInstance().fields = { webserver: { port: "base64|MTMzOA==" } };
    assert.equal(Config.getInstance().get("webserver", "port"), 1338);
  });

  it("decodes environment variable as base64 if BASE64= is before the variable", () => {
    Config.getInstance().fields = {
      webserver: { port: "env|base64|SEASONED_WEBSERVER_PORT" }
    };
    process.env.SEASONED_WEBSERVER_PORT = "MTMzOA==";
    assert.equal(Config.getInstance().get("webserver", "port"), 1338);
  });
});