import { describe, it, expect } from "bun:test";
import {
  hashPassword,
  verifyPassword,
  validatePasswordStrength,
  isPasswordInHistory,
  addPasswordToHistory,
} from "../lib/password";

describe("password utils", () => {
  it("hashes and verifies password correctly", async () => {
    const hash = await hashPassword("Str0ng!Pass");
    expect(await verifyPassword("Str0ng!Pass", hash)).toBe(true);
    expect(await verifyPassword("WrongPass", hash)).toBe(false);
  });

  it("validates password strength", () => {
    const result = validatePasswordStrength("Str0ng!Pass");
    expect(result.valid).toBe(true);
    expect(validatePasswordStrength("weak").valid).toBe(false);
    expect(validatePasswordStrength("nodigits!").valid).toBe(false);
    expect(validatePasswordStrength("NOLOWER1!").valid).toBe(false);
    expect(validatePasswordStrength("noupper1!").valid).toBe(false);
    expect(validatePasswordStrength("NoSpecial123").valid).toBe(false);
  });

  it("detects password reuse", async () => {
    const hash1 = await hashPassword("ReusedPass1!");
    const hash2 = await hashPassword("Different2!");
    const history = [hash1, hash2];
    expect(await isPasswordInHistory("ReusedPass1!", history)).toBe(true);
    expect(await isPasswordInHistory("NewPass!", history)).toBe(false);
  });

  it("manages password history size", async () => {
    const hashes: string[] = [];
    for (let i = 0; i < 7; i++) {
      const h = await hashPassword(`Pass${i}!`);
      hashes.push(h);
    }
    const updated = addPasswordToHistory(hashes[6], hashes.slice(0, 6));
    expect(updated.length).toBe(5);
  });
});