import { hash as bcryptHash } from "bcryptjs";
import { describe, expect, it } from "vitest";
import {
  checkLogin,
  hashPassword,
  isMd5Of,
  md5Hex,
  verifyPassword,
} from "./password";

describe("md5Hex", () => {
  it("matches PHP md5() on canonical vectors", () => {
    expect(md5Hex("")).toBe("d41d8cd98f00b204e9800998ecf8427e");
    expect(md5Hex("abc")).toBe("900150983cd24fb0d6963f7d28e17f72");
  });
});

describe("argon2id", () => {
  it("hashes with the AtomCMS params (m=65536,t=4,p=1) and round-trips", async () => {
    const h = await hashPassword("s3cret!");
    expect(h).toMatch(/^\$argon2id\$v=19\$m=65536,t=4,p=1\$/);
    expect(await verifyPassword("s3cret!", h)).toBe(true);
    expect(await verifyPassword("wrong", h)).toBe(false);
  });
});

describe("bcrypt", () => {
  it("verifies a bcrypt hash and accepts the PHP $2y$ prefix", async () => {
    const h = await bcryptHash("hunter2", 10); // bcryptjs emits $2a$
    expect(await verifyPassword("hunter2", h)).toBe(true);
    // PHP stores $2y$ — bcryptjs must accept it as equivalent.
    const phpStyle = h.replace(/^\$2[ab]\$/, "$2y$");
    expect(await verifyPassword("hunter2", phpStyle)).toBe(true);
    expect(await verifyPassword("nope", h)).toBe(false);
  });
});

describe("isMd5Of", () => {
  it("detects a legacy md5 password", () => {
    expect(isMd5Of("habbo", md5Hex("habbo"))).toBe(true);
    expect(isMd5Of("habbo", md5Hex("other"))).toBe(false);
    expect(isMd5Of("habbo", "not-a-hash")).toBe(false);
  });
});

describe("checkLogin", () => {
  it("upgrades a legacy md5 hash to argon2id when conversion is enabled", async () => {
    const stored = md5Hex("oldpass");
    const res = await checkLogin("oldpass", stored, { convertPasswords: true });
    expect(res.valid).toBe(true);
    expect(res.upgradedHash).toMatch(/^\$argon2id\$/);
    // The upgraded hash verifies the same password.
    expect(await verifyPassword("oldpass", res.upgradedHash as string)).toBe(true);
  });

  it("does NOT upgrade md5 when conversion is disabled", async () => {
    const stored = md5Hex("oldpass");
    const res = await checkLogin("oldpass", stored, { convertPasswords: false });
    expect(res.valid).toBe(false);
    expect(res.upgradedHash).toBeUndefined();
  });

  it("validates an existing argon2id hash with no upgrade", async () => {
    const stored = await hashPassword("modern");
    const res = await checkLogin("modern", stored, { convertPasswords: true });
    expect(res.valid).toBe(true);
    expect(res.upgradedHash).toBeUndefined();
  });
});