import { describe, expect, it } from "bun:test";
import { extractCron } from "../src/agent/cron.ts";

describe("extractCron", () => {
  it("passes through a clean 5-field expression", () => {
    expect(extractCron("*/5 * * * *")).toBe("*/5 * * * *");
  });

  it("passes through a clean 6-field expression", () => {
    expect(extractCron("*/5 * * * * *")).toBe("*/5 * * * * *");
  });

  it("strips surrounding backticks", () => {
    expect(extractCron("`*/5 * * * *`")).toBe("*/5 * * * *");
  });

  it("strips triple backticks with language tag", () => {
    expect(extractCron("```cron\n*/5 * * * *\n```")).toBe("*/5 * * * *");
  });

  it("extracts cron from verbose multiline LLM output", () => {
    const verbose = ["Here is the cron expression:", "*/5 * * * *", "This runs every 5 minutes."].join("\n");
    expect(extractCron(verbose)).toBe("*/5 * * * *");
  });

  it("extracts 6-field cron from explanation text", () => {
    const verbose = "For every 5 seconds: */5 * * * * *";
    expect(extractCron(verbose)).toBe("*/5 * * * * *");
  });

  it("handles leading/trailing whitespace", () => {
    expect(extractCron("  0 9 * * 1-5  ")).toBe("0 9 * * 1-5");
  });

  it("handles cron with commas and ranges", () => {
    expect(extractCron("0,30 9-17 * * 1-5")).toBe("0,30 9-17 * * 1-5");
  });

  it("returns cleaned input as fallback when no cron pattern matches", () => {
    expect(extractCron("not a cron")).toBe("not a cron");
  });
});