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"""
Tests for src/analyzer/utils/text.py

Tests cover:
- clean(): whitespace normalization
- to_number(): flexible number parsing
- extract_numbers(): finding all numbers in text
- safe_truncate_chars(): character truncation with ellipsis
- safe_truncate_tokens(): token-aware truncation
"""
import pytest
from src.analyzer.utils.text import (
    clean,
    to_number,
    extract_numbers,
    safe_truncate_chars,
    safe_truncate_tokens,
)


class TestClean:
    """Test clean() function for text normalization."""

    def test_clean_basic(self):
        assert clean("hello world") == "hello world"

    def test_clean_multiple_spaces(self):
        assert clean("hello    world") == "hello world"

    def test_clean_newlines_and_tabs(self):
        assert clean("hello\n\t  world") == "hello world"

    def test_clean_leading_trailing(self):
        assert clean("  hello world  ") == "hello world"

    def test_clean_none(self):
        assert clean(None) == ""

    def test_clean_empty_string(self):
        assert clean("") == ""

    def test_clean_only_whitespace(self):
        assert clean("   \n\t  ") == ""

    def test_clean_numbers(self):
        assert clean(123) == "123"

    def test_clean_complex_whitespace(self):
        result = clean("hello  \n\n  world\t\tfoo   bar")
        assert result == "hello world foo bar"


class TestToNumber:
    """Test to_number() function for flexible number parsing."""

    def test_to_number_int(self):
        assert to_number(42) == 42.0

    def test_to_number_float(self):
        assert to_number(3.14) == 3.14

    def test_to_number_string_int(self):
        assert to_number("42") == 42.0

    def test_to_number_string_float(self):
        assert to_number("3.14") == 3.14

    def test_to_number_with_commas(self):
        assert to_number("1,234,567") == 1234567.0

    def test_to_number_with_currency(self):
        assert to_number("£1,234.50") == 1234.50

    def test_to_number_negative(self):
        assert to_number("-42.5") == -42.5

    def test_to_number_none(self):
        assert to_number(None) is None

    def test_to_number_empty_string(self):
        assert to_number("") is None

    def test_to_number_no_numbers(self):
        assert to_number("hello") is None

    def test_to_number_mixed_text(self):
        # Should extract first number from text
        assert to_number("Project cost: £25,000.00") == 25000.0

    def test_to_number_zero(self):
        assert to_number(0) == 0.0
        assert to_number("0") == 0.0


class TestExtractNumbers:
    """Test extract_numbers() for finding all numbers in text."""

    def test_extract_numbers_single(self):
        assert extract_numbers("42") == [42.0]

    def test_extract_numbers_multiple(self):
        assert extract_numbers("10 20 30") == [10.0, 20.0, 30.0]

    def test_extract_numbers_mixed_text(self):
        result = extract_numbers("Budget: £1,234 Duration: 12 months")
        assert result == [1.0, 234.0, 12.0]

    def test_extract_numbers_floats(self):
        assert extract_numbers("3.14 2.71 1.41") == [3.14, 2.71, 1.41]

    def test_extract_numbers_negative(self):
        assert extract_numbers("-10 20 -30") == [-10.0, 20.0, -30.0]

    def test_extract_numbers_none(self):
        assert extract_numbers(None) == []

    def test_extract_numbers_empty(self):
        assert extract_numbers("") == []

    def test_extract_numbers_no_numbers(self):
        assert extract_numbers("hello world") == []


class TestSafeTruncateChars:
    """Test safe_truncate_chars() for character-based truncation."""

    def test_truncate_chars_short(self):
        assert safe_truncate_chars("hello", 10) == "hello"

    def test_truncate_chars_exact(self):
        assert safe_truncate_chars("hello", 5) == "hello"

    def test_truncate_chars_long(self):
        result = safe_truncate_chars("hello world", 8)
        assert result == "hello w…"
        assert len(result) == 8

    def test_truncate_chars_very_short(self):
        result = safe_truncate_chars("hello", 3)
        assert result == "he…"

    def test_truncate_chars_zero(self):
        result = safe_truncate_chars("hello", 0)
        assert result == "…"

    def test_truncate_chars_none(self):
        assert safe_truncate_chars(None, 10) == ""

    def test_truncate_chars_empty(self):
        assert safe_truncate_chars("", 10) == ""


class TestSafeTruncateTokens:
    """Test safe_truncate_tokens() for token-aware truncation."""

    def test_truncate_tokens_short(self):
        result = safe_truncate_tokens("hello world", 100)
        assert result == "hello world"

    def test_truncate_tokens_fallback(self):
        # Test fallback mode (when tiktoken not available or errors)
        # Should use char-based approximation (~4 chars per token)
        text = "a" * 100
        result = safe_truncate_tokens(text, 10)
        # Should truncate to ~40 chars (10 tokens * 4 chars)
        assert len(result) <= 41  # 40 + ellipsis

    def test_truncate_tokens_none(self):
        assert safe_truncate_tokens(None, 10) == ""

    def test_truncate_tokens_empty(self):
        assert safe_truncate_tokens("", 10) == ""

    def test_truncate_tokens_exact(self):
        # Simple short text should not be truncated
        result = safe_truncate_tokens("hi", 10)
        assert result == "hi"


class TestEdgeCases:
    """Test edge cases and corner scenarios."""

    def test_clean_with_unicode(self):
        assert clean("hello 世界") == "hello 世界"

    def test_to_number_with_unicode_currency(self):
        # Test with various currency symbols
        assert to_number("€100") == 100.0

    def test_extract_numbers_scientific_notation(self):
        # Should handle basic scientific notation
        result = extract_numbers("1e5")
        # Depends on implementation - might be [1.0, 5.0] or handle it
        assert len(result) >= 1

    def test_truncate_chars_unicode(self):
        result = safe_truncate_chars("hello 世界", 7)
        assert len(result) == 7
        assert result.endswith("…")

    def test_clean_converts_types(self):
        # Test that clean handles various types
        assert clean([1, 2, 3]) == "[1, 2, 3]"
        assert clean({"a": 1}) in ["{'a': 1}", "{'a':1}"]  # Dict repr may vary


if __name__ == "__main__":
    pytest.main([__file__, "-v"])