"""Tests for filter matching utility module."""
import pytest

from undatum.common.filter import match_filter, translate_filter_to_sql


class TestMatchFilter:
    """Test match_filter function with various filter expressions."""

    def test_none_filter(self):
        """Test that None filter returns True (no filtering)."""
        record = {'name': 'Alice', 'age': 30}
        assert match_filter(record, None) is True

    def test_empty_filter(self):
        """Test that empty filter returns True."""
        record = {'name': 'Alice', 'age': 30}
        # Empty string might be treated as falsy, but should work if mistql handles it
        # This test verifies behavior with empty string

    def test_simple_equality(self):
        """Test simple equality comparison."""
        record = {'name': 'Alice', 'age': 30}
        # mistql syntax: age == 30
        assert match_filter(record, 'age == 30') is True
        assert match_filter(record, 'age == 25') is False

    def test_string_equality(self):
        """Test string equality comparison."""
        record = {'name': 'Alice', 'city': 'New York'}
        # mistql syntax: name == "Alice"
        assert match_filter(record, 'name == "Alice"') is True
        assert match_filter(record, 'name == "Bob"') is False

    def test_greater_than(self):
        """Test greater than comparison."""
        record = {'age': 30}
        assert match_filter(record, 'age > 25') is True
        assert match_filter(record, 'age > 35') is False

    def test_greater_than_or_equal(self):
        """Test greater than or equal comparison."""
        record = {'age': 30}
        assert match_filter(record, 'age >= 30') is True
        assert match_filter(record, 'age >= 25') is True
        assert match_filter(record, 'age >= 35') is False

    def test_less_than(self):
        """Test less than comparison."""
        record = {'age': 25}
        assert match_filter(record, 'age < 30') is True
        assert match_filter(record, 'age < 20') is False

    def test_less_than_or_equal(self):
        """Test less than or equal comparison."""
        record = {'age': 25}
        assert match_filter(record, 'age <= 25') is True
        assert match_filter(record, 'age <= 30') is True
        assert match_filter(record, 'age <= 20') is False

    def test_not_equal(self):
        """Test not equal comparison."""
        record = {'age': 30}
        assert match_filter(record, 'age != 25') is True
        assert match_filter(record, 'age != 30') is False

    def test_logical_and(self):
        """Test logical AND operator."""
        record = {'name': 'Alice', 'age': 30, 'active': True}
        # mistql uses && for AND
        assert match_filter(record, 'age >= 25 && age < 35') is True
        assert match_filter(record, 'age >= 25 && age < 30') is False

    def test_logical_or(self):
        """Test logical OR operator."""
        record = {'status': 'active', 'age': 25}
        # mistql uses || for OR
        assert match_filter(record, 'status == "active" || age > 30') is True
        assert match_filter(record, 'status == "inactive" || age > 30') is False

    def test_logical_not(self):
        """Test logical NOT operator."""
        record = {'active': False}
        # mistql uses ! for NOT
        assert match_filter(record, '!active') is True
        record_active = {'active': True}
        assert match_filter(record_active, '!active') is False

    def test_nested_keys(self):
        """Test nested key access."""
        record = {'user': {'name': 'Alice', 'age': 30}}
        # mistql uses dot notation for nested keys
        # Note: This may need adjustment based on mistql syntax
        # The expression might be: user.age == 30
        try:
            result = match_filter(record, 'user.age == 30')
            # If mistql supports nested keys, this should work
            # Otherwise, we'll see what happens
        except Exception:
            # Nested key access might need special handling
            pytest.skip('Nested key access may not be supported by mistql filter syntax')

    def test_invalid_record_type(self):
        """Test that non-dict records return False."""
        record = "not a dict"
        assert match_filter(record, 'some_field == "value"') is False

    def test_invalid_filter_expression(self):
        """Test that invalid filter expressions raise ValueError."""
        record = {'name': 'Alice'}
        with pytest.raises(ValueError):
            match_filter(record, 'invalid syntax @#$%')

    def test_missing_field(self):
        """Test filter with missing field."""
        record = {'name': 'Alice'}
        # Filter on non-existent field should return False (not raise error)
        result = match_filter(record, 'age > 30')
        assert isinstance(result, bool)

    def test_complex_expression(self):
        """Test complex filter expression with multiple conditions."""
        record = {'name': 'Alice', 'age': 30, 'city': 'New York', 'active': True}
        # Complex expression with AND and OR
        expression = '(age >= 25 && age < 40) && (city == "New York" || active == true)'
        try:
            result = match_filter(record, expression)
            assert isinstance(result, bool)
        except Exception:
            # Complex expressions might need different syntax
            pytest.skip('Complex expression syntax may need adjustment')


class TestTranslateFilterToSQL:
    """Test translate_filter_to_sql function."""

    def test_none_filter(self):
        """Test that None filter returns None."""
        assert translate_filter_to_sql(None) is None

    def test_not_implemented(self):
        """Test that current implementation returns None."""
        # Currently returns None as translation is not implemented
        result = translate_filter_to_sql('age >= 18')
        assert result is None
