import pytest
import io
import rwl

# Define a set of problematic encodings and unicode strings
ENCODINGS = [
    'utf-8',
    'utf-16',
    'utf-32',
    'latin-1',
    'ascii',
    'gbk',  # Chinese encoding
    'big5', # Traditional Chinese encoding
    'shift_jis', # Japanese encoding
    'iso-8859-1',
    'iso-8859-15',
    'koi8-r', # Cyrillic encoding
    'cp1252', # Windows encoding
    'utf-7', # Discouraged, can be problematic
]

UNICODE_STRINGS = [
    "Hello, world!",
    "你好，世界！",  # Chinese
    "こんにちは世界",  # Japanese
    "Привет, мир!",  # Russian
    "வணக்கம் உலகம்",  # Tamil
    "नमस्ते दुनिया",  # Hindi
    "🌎🌍🌏", # Emoji
    "Mixed English and 中文",
    "Mixed English and 日本語",
    "Mixed English and русский",
    "\u202EThis is RTL text", # Right-to-left override
    "\u2069This is PDF text" # Pop directional formatting
]

def test_encoding_attack_resilience():
    """
    Tests that RWL gracefully handles various encodings and unicode strings
    without crashing or corrupting data.
    """

    for encoding in ENCODINGS:
        for unicode_string in UNICODE_STRINGS:
            # Encode the unicode string to bytes using the current encoding
            try:
                encoded_bytes = unicode_string.encode(encoding, errors='ignore')  # Use errors='ignore' to prevent crashing on unsupported characters
            except LookupError:
                # Skip if the encoding is not supported on the system
                continue

            # Decode the bytes back to unicode using the same encoding
            try:
                decoded_string = encoded_bytes.decode(encoding, errors='ignore')  # Same as above
            except UnicodeDecodeError:
                # If decoding fails, consider it a potential issue, log it, but don't crash.
                print(f"Warning: UnicodeDecodeError with encoding {encoding} and string '{unicode_string}'")
                assert False, f"UnicodeDecodeError with encoding {encoding} and string '{unicode_string}'"
                continue

            # Process the decoded string through a simplified RWL-like function
            # This is a placeholder to simulate RWL's operations
            processed_string = rwl_process(decoded_string)  #Replace this dummy implementation with actual RWL

            # Assert that no exceptions were raised, and the processed string is not empty (indicates some processing happened)
            assert processed_string is not None, f"RWL processing failed for encoding {encoding} and string '{unicode_string}'"
            assert len(processed_string) > 0, f"RWL produced empty string for encoding {encoding} and string '{unicode_string}'"


def rwl_process(input_string):
  """
  A dummy placeholder for an RWL processing function.  Replace with actual RWL integration.
  This function simply reverses the string and returns it.  The important thing is that
  it simulates *some* form of processing on the input string.
  """
  return input_string[::-1]