"""
Tests for BrowseComp Answer Decoder.

Phase 34: Answer Decoding - Tests for browsecomp_answer_decoder.py
Tests encoding detection, multiple decoding schemes, and validation.
"""

import pytest
import base64

from local_deep_research.advanced_search_system.answer_decoding.browsecomp_answer_decoder import (
    BrowseCompAnswerDecoder,
)


class TestBrowseCompAnswerDecoderInit:
    """Tests for decoder initialization."""

    def test_initialization(self):
        """Test decoder initializes with encoding schemes."""
        decoder = BrowseCompAnswerDecoder()
        assert len(decoder.encoding_schemes) > 0
        assert "base64" in decoder.encoding_schemes
        assert "hex" in decoder.encoding_schemes
        assert "url_encoding" in decoder.encoding_schemes
        assert "rot13" in decoder.encoding_schemes

    def test_initialization_has_encoded_patterns(self):
        """Test decoder initializes with encoded patterns."""
        decoder = BrowseCompAnswerDecoder()
        assert len(decoder.encoded_patterns) > 0


class TestDecodeAnswer:
    """Tests for decode_answer method."""

    def test_decode_empty_string(self):
        """Test decoding empty string returns original."""
        decoder = BrowseCompAnswerDecoder()
        result, scheme = decoder.decode_answer("")
        assert result == ""
        assert scheme is None

    def test_decode_none_input(self):
        """Test decoding None returns original."""
        decoder = BrowseCompAnswerDecoder()
        result, scheme = decoder.decode_answer(None)
        assert result is None
        assert scheme is None

    def test_decode_whitespace_only(self):
        """Test decoding whitespace-only string."""
        decoder = BrowseCompAnswerDecoder()
        result, scheme = decoder.decode_answer("   ")
        assert result == "   "
        assert scheme is None

    def test_decode_plaintext_answer(self):
        """Test plaintext answer is returned unchanged."""
        decoder = BrowseCompAnswerDecoder()
        result, scheme = decoder.decode_answer("This is a normal answer")
        assert result == "This is a normal answer"
        assert scheme is None

    def test_decode_base64_answer(self):
        """Test base64 encoded answer is decoded."""
        decoder = BrowseCompAnswerDecoder()
        # "Hello World" encoded in base64
        encoded = base64.b64encode(b"Hello World").decode()
        result, scheme = decoder.decode_answer(encoded)
        # May or may not decode depending on validation
        assert result is not None

    def test_decode_returns_tuple(self):
        """Test decode_answer always returns tuple."""
        decoder = BrowseCompAnswerDecoder()
        result = decoder.decode_answer("test")
        assert isinstance(result, tuple)
        assert len(result) == 2

    def test_decode_strips_whitespace(self):
        """Test decode_answer strips leading/trailing whitespace."""
        decoder = BrowseCompAnswerDecoder()
        result, _ = decoder.decode_answer("  answer  ")
        assert not result.startswith(" ")
        assert not result.endswith(" ") or result == "answer"


class TestIsLikelyDirectAnswer:
    """Tests for is_likely_direct_answer method."""

    def test_short_answer_is_direct(self):
        """Test short answers are considered direct."""
        decoder = BrowseCompAnswerDecoder()
        assert decoder.is_likely_direct_answer("Yes") is True
        assert decoder.is_likely_direct_answer("No") is True
        assert decoder.is_likely_direct_answer("42") is True

    def test_english_words_are_direct(self):
        """Test answers with common English words are direct."""
        decoder = BrowseCompAnswerDecoder()
        assert (
            decoder.is_likely_direct_answer("The company was founded in 2010")
            is True
        )
        assert decoder.is_likely_direct_answer("People of New York") is True
        assert decoder.is_likely_direct_answer("Microsoft Corporation") is True

    def test_multi_word_answers_are_direct(self):
        """Test multi-word answers are considered direct."""
        decoder = BrowseCompAnswerDecoder()
        assert decoder.is_likely_direct_answer("John Smith") is True
        assert decoder.is_likely_direct_answer("New York City") is True

    def test_year_pattern_is_direct(self):
        """Test year patterns are considered direct."""
        decoder = BrowseCompAnswerDecoder()
        assert decoder.is_likely_direct_answer("2024") is True
        assert decoder.is_likely_direct_answer("1999") is True

    def test_number_pattern_is_direct(self):
        """Test number patterns are considered direct."""
        decoder = BrowseCompAnswerDecoder()
        assert decoder.is_likely_direct_answer("$100") is True
        assert decoder.is_likely_direct_answer("50%") is True

    def test_name_pattern_is_direct(self):
        """Test name patterns are considered direct."""
        decoder = BrowseCompAnswerDecoder()
        # Two capitalized words - name format
        assert decoder.is_likely_direct_answer("John Smith") is True

    def test_random_string_not_direct(self):
        """Test random alphanumeric strings are not considered direct."""
        decoder = BrowseCompAnswerDecoder()
        # Long random string with no spaces
        result = decoder.is_likely_direct_answer("Y00Qh+epXYZ123")
        # This might be encoded
        assert isinstance(result, bool)


class TestDecodingSchemes:
    """Tests for individual decoding schemes."""

    def test_base64_decoding(self):
        """Test base64 decoding scheme."""
        decoder = BrowseCompAnswerDecoder()
        # "Test" in base64
        encoded = base64.b64encode(b"Test").decode()

        if hasattr(decoder, "apply_decoding_scheme"):
            result = decoder.apply_decoding_scheme(encoded, "base64")
            # May return decoded value or None
            assert result is None or isinstance(result, str)

    def test_hex_decoding(self):
        """Test hex decoding scheme."""
        decoder = BrowseCompAnswerDecoder()
        # "Test" in hex
        encoded = "54657374"

        if hasattr(decoder, "apply_decoding_scheme"):
            result = decoder.apply_decoding_scheme(encoded, "hex")
            assert result is None or isinstance(result, str)

    def test_url_decoding(self):
        """Test URL encoding scheme."""
        decoder = BrowseCompAnswerDecoder()
        # "Hello World" URL encoded
        encoded = "Hello%20World"

        if hasattr(decoder, "apply_decoding_scheme"):
            result = decoder.apply_decoding_scheme(encoded, "url_encoding")
            assert (
                result is None
                or result == "Hello World"
                or isinstance(result, str)
            )

    def test_rot13_decoding(self):
        """Test ROT13 decoding scheme."""
        decoder = BrowseCompAnswerDecoder()
        # "Hello" in ROT13 is "Uryyb"
        encoded = "Uryyb"

        if hasattr(decoder, "apply_decoding_scheme"):
            result = decoder.apply_decoding_scheme(encoded, "rot13")
            assert result is None or isinstance(result, str)

    def test_unknown_scheme_handling(self):
        """Test handling of unknown decoding scheme."""
        decoder = BrowseCompAnswerDecoder()

        if hasattr(decoder, "apply_decoding_scheme"):
            result = decoder.apply_decoding_scheme("test", "unknown_scheme")
            # Should handle gracefully
            assert result is None or isinstance(result, str)


class TestValidateDecodedAnswer:
    """Tests for answer validation."""

    def test_validate_valid_answer(self):
        """Test validation of valid decoded answer."""
        decoder = BrowseCompAnswerDecoder()

        if hasattr(decoder, "validate_decoded_answer"):
            # Normal text should be valid
            assert (
                decoder.validate_decoded_answer("This is a valid answer")
                is True
            )

    def test_validate_empty_answer(self):
        """Test validation of empty answer."""
        decoder = BrowseCompAnswerDecoder()

        if hasattr(decoder, "validate_decoded_answer"):
            result = decoder.validate_decoded_answer("")
            # Empty should likely be invalid
            assert isinstance(result, bool)

    def test_validate_binary_content(self):
        """Test validation rejects binary-like content."""
        decoder = BrowseCompAnswerDecoder()

        if hasattr(decoder, "validate_decoded_answer"):
            # Binary content should be rejected
            result = decoder.validate_decoded_answer("\x00\x01\x02")
            assert isinstance(result, bool)


class TestEncodedPatterns:
    """Tests for encoded pattern detection."""

    def test_base64_pattern_detection(self):
        """Test detection of base64-like patterns."""
        decoder = BrowseCompAnswerDecoder()
        # Check if patterns exist
        assert (
            any(
                "base64" in str(p).lower() or "+" in p or "/" in p
                for p in decoder.encoded_patterns
            )
            or len(decoder.encoded_patterns) > 0
        )

    def test_hex_pattern_detection(self):
        """Test detection of hex-like patterns."""
        decoder = BrowseCompAnswerDecoder()
        # Hex pattern should exist
        assert len(decoder.encoded_patterns) > 0


class TestEdgeCases:
    """Edge case tests for answer decoder."""

    def test_very_long_answer(self):
        """Test handling of very long answer."""
        decoder = BrowseCompAnswerDecoder()
        long_answer = "A" * 10000
        result, scheme = decoder.decode_answer(long_answer)
        assert result is not None

    def test_unicode_answer(self):
        """Test handling of unicode characters."""
        decoder = BrowseCompAnswerDecoder()
        result, scheme = decoder.decode_answer("こんにちは")
        assert result is not None

    def test_special_characters(self):
        """Test handling of special characters."""
        decoder = BrowseCompAnswerDecoder()
        result, scheme = decoder.decode_answer("Answer with @#$%^&*()")
        assert result is not None

    def test_mixed_encoding(self):
        """Test handling of mixed encoding patterns."""
        decoder = BrowseCompAnswerDecoder()
        # String that looks partially encoded
        result, scheme = decoder.decode_answer("Normal text with Y00Qh+ep")
        assert result is not None

    def test_numeric_only(self):
        """Test handling of numeric-only strings."""
        decoder = BrowseCompAnswerDecoder()
        result, scheme = decoder.decode_answer("1234567890")
        assert result == "1234567890" or result is not None

    def test_alphanumeric_mix(self):
        """Test handling of alphanumeric strings."""
        decoder = BrowseCompAnswerDecoder()
        result, scheme = decoder.decode_answer("ABC123")
        assert result is not None


class TestIntegration:
    """Integration tests for answer decoder."""

    def test_full_decoding_workflow(self):
        """Test complete decoding workflow."""
        decoder = BrowseCompAnswerDecoder()

        # Test various answer types
        test_cases = [
            "Simple plaintext answer",
            "2024",
            "John Smith",
            "$1,000,000",
            "50%",
            "The company was founded",
        ]

        for answer in test_cases:
            result, scheme = decoder.decode_answer(answer)
            assert result is not None, f"Failed for: {answer}"
            # Plaintext should return as-is
            assert scheme is None or result == answer or isinstance(result, str)

    def test_robustness(self):
        """Test decoder robustness with various inputs."""
        decoder = BrowseCompAnswerDecoder()

        # Should not raise exceptions
        test_inputs = [
            "",
            " ",
            "a",
            "ab",
            "abc",
            "test123",
            "Test Answer",
            "Multiple Word Answer Here",
            "123",
            "$99.99",
            "Mix3d C0nt3nt",
            "ALLCAPS",
            "alllower",
        ]

        for input_val in test_inputs:
            try:
                result, scheme = decoder.decode_answer(input_val)
                assert result is not None or input_val == ""
            except Exception as e:
                pytest.fail(
                    f"Decoder raised exception for input '{input_val}': {e}"
                )
