import { describe, it, expect } from "vitest";
import { sanitizeToolName } from "../utils";

describe("sanitizeToolName", () => {
  it("should replace hyphens with underscores", () => {
    expect(sanitizeToolName("get-weather")).toBe("get_weather");
  });

  it("should replace dots with underscores", () => {
    expect(sanitizeToolName("api.v2.search")).toBe("api_v2_search");
  });

  it("should replace spaces with underscores", () => {
    expect(sanitizeToolName("my tool")).toBe("my_tool");
  });

  it("should prefix digit-leading names with underscore", () => {
    expect(sanitizeToolName("3drender")).toBe("_3drender");
  });

  it("should append underscore to reserved words", () => {
    expect(sanitizeToolName("class")).toBe("class_");
    expect(sanitizeToolName("return")).toBe("return_");
    expect(sanitizeToolName("delete")).toBe("delete_");
  });

  it("should strip special characters", () => {
    expect(sanitizeToolName("hello@world!")).toBe("helloworld");
  });

  it("should handle empty string", () => {
    expect(sanitizeToolName("")).toBe("_");
  });

  it("should handle string with only special characters", () => {
    // $ is a valid identifier character, so "@#$" → "$"
    expect(sanitizeToolName("@#$")).toBe("$");
    expect(sanitizeToolName("@#!")).toBe("_");
  });

  it("should leave valid identifiers unchanged", () => {
    expect(sanitizeToolName("getWeather")).toBe("getWeather");
    expect(sanitizeToolName("_private")).toBe("_private");
    expect(sanitizeToolName("$jquery")).toBe("$jquery");
  });
});