defmodule Odinsea.CryptoSimpleTest do
  @moduledoc """
  Simple test module for MapleStory crypto implementation.
  These tests don't require the full application to start.
  """

  use ExUnit.Case

  alias Odinsea.Net.Cipher.{IGCipher, ShandaCipher, AESCipher}

  describe "IGCipher (IV transformation)" do
    test "inno_hash transforms IV correctly" do
      iv = <<0x34, 0x9A, 0x0F, 0x0C>>
      result = IGCipher.inno_hash(iv)
      
      # Result should be 4 bytes
      assert byte_size(result) == 4
      
      # Result should be different from input (usually)
      assert result != iv
    end
    
    test "inno_hash produces deterministic results" do
      iv = <<0xA8, 0xBC, 0x0D, 0xB3>>
      result1 = IGCipher.inno_hash(iv)
      result2 = IGCipher.inno_hash(iv)
      
      assert result1 == result2
    end
  end
  
  describe "ShandaCipher" do
    test "encrypt and decrypt are inverse operations" do
      original = <<1, 0, 7, 112, 0, 4, 0>>  # CP_PermissionRequest payload
      encrypted = ShandaCipher.encrypt(original)
      decrypted = ShandaCipher.decrypt(encrypted)
      
      assert decrypted == original
    end
    
    test "encrypt produces different output" do
      original = <<1, 0, 7, 112, 0, 4, 0>>
      encrypted = ShandaCipher.encrypt(original)
      
      assert encrypted != original
    end
  end
  
  describe "AESCipher" do
    test "crypt is self-inverse (XOR property)" do
      data = <<1, 0, 7, 112, 0, 4, 0>>
      iv = <<0xA8, 0xBC, 0x0D, 0xB3>>
      
      encrypted = AESCipher.crypt(data, iv)
      decrypted = AESCipher.crypt(encrypted, iv)
      
      assert decrypted == data
    end
  end
end