import { test, expect, describe } from "bun:test";
import { loadConfig } from "../src/config";

describe("config", () => {
  test("loadConfig env variables override config file and defaults", async () => {
    const origBase = process.env.GAI_API_BASE;
    const origModel = process.env.GAI_MODEL;

    process.env.GAI_API_BASE = "https://custom.api.com/v1";
    process.env.GAI_MODEL = "custom-model";

    const config = await loadConfig();

    expect(config.apiBase).toBe("https://custom.api.com/v1");
    expect(config.model).toBe("custom-model");

    if (origBase) process.env.GAI_API_BASE = origBase;
    else delete process.env.GAI_API_BASE;
    if (origModel) process.env.GAI_MODEL = origModel;
    else delete process.env.GAI_MODEL;
  });

  test("loadConfig reads from environment variables", async () => {
    const origBase = process.env.GAI_API_BASE;
    const origModel = process.env.GAI_MODEL;

    process.env.GAI_API_BASE = "https://api.deepseek.com/v1";
    process.env.GAI_MODEL = "deepseek-v4-flash";

    const config = await loadConfig();

    expect(config.apiBase).toBe("https://api.deepseek.com/v1");
    expect(config.model).toBe("deepseek-v4-flash");

    if (origBase) process.env.GAI_API_BASE = origBase;
    else delete process.env.GAI_API_BASE;
    if (origModel) process.env.GAI_MODEL = origModel;
    else delete process.env.GAI_MODEL;
  });
});