"""
Unit tests for schema_naming.py - Schema filename validation.

Tests the schema naming convention enforcement including:
- Valid filename validation
- Invalid filename detection
- Metadata extraction
- Filename suggestion
- Error message generation
"""

import pytest
from markitect.schema_naming import (
    validate_schema_filename,
    suggest_schema_filename,
    extract_schema_metadata,
    get_validation_errors,
    is_valid_schema_filename,
    format_validation_message,
    SchemaFilenameError,
    SCHEMA_FILENAME_PATTERN
)


class TestValidateSchemaFilename:
    """Tests for validate_schema_filename function."""

    def test_valid_simple_schema(self):
        """Test validation of simple valid schema filename."""
        is_valid, metadata = validate_schema_filename("manpage-schema-v1.0.md")

        assert is_valid is True
        assert metadata is not None
        assert metadata['domain'] == 'manpage'
        assert metadata['version'] == '1.0'
        assert metadata['major'] == 1
        assert metadata['minor'] == 0
        assert metadata['filename'] == 'manpage-schema-v1.0.md'

    def test_valid_hyphenated_domain(self):
        """Test validation with multi-word hyphenated domain."""
        is_valid, metadata = validate_schema_filename("api-documentation-schema-v1.0.md")

        assert is_valid is True
        assert metadata['domain'] == 'api-documentation'
        assert metadata['version'] == '1.0'

    def test_valid_with_numbers_in_domain(self):
        """Test validation with numbers in domain name."""
        is_valid, metadata = validate_schema_filename("arc42-schema-v1.0.md")

        assert is_valid is True
        assert metadata['domain'] == 'arc42'

    def test_valid_higher_version(self):
        """Test validation with version > 1.0."""
        is_valid, metadata = validate_schema_filename("manpage-schema-v2.5.md")

        assert is_valid is True
        assert metadata['version'] == '2.5'
        assert metadata['major'] == 2
        assert metadata['minor'] == 5

    def test_valid_double_digit_version(self):
        """Test validation with double-digit version numbers."""
        is_valid, metadata = validate_schema_filename("manpage-schema-v10.25.md")

        assert is_valid is True
        assert metadata['major'] == 10
        assert metadata['minor'] == 25

    def test_invalid_wrong_extension(self):
        """Test that .json extension is invalid."""
        is_valid, metadata = validate_schema_filename("manpage-schema-v1.0.json")

        assert is_valid is False
        assert metadata is None

    def test_invalid_no_extension(self):
        """Test that filename without extension is invalid."""
        is_valid, metadata = validate_schema_filename("manpage-schema-v1.0")

        assert is_valid is False
        assert metadata is None

    def test_invalid_missing_schema_keyword(self):
        """Test that filename without 'schema' keyword is invalid."""
        is_valid, metadata = validate_schema_filename("manpage-v1.0.md")

        assert is_valid is False
        assert metadata is None

    def test_invalid_missing_version(self):
        """Test that filename without version is invalid."""
        is_valid, metadata = validate_schema_filename("manpage-schema.md")

        assert is_valid is False
        assert metadata is None

    def test_invalid_wrong_version_format(self):
        """Test that version without 'v' prefix is invalid."""
        is_valid, metadata = validate_schema_filename("manpage-schema-1.0.md")

        assert is_valid is False
        assert metadata is None

    def test_invalid_missing_minor_version(self):
        """Test that version without minor number is invalid."""
        is_valid, metadata = validate_schema_filename("manpage-schema-v1.md")

        assert is_valid is False
        assert metadata is None

    def test_invalid_uppercase_letters(self):
        """Test that uppercase letters make filename invalid."""
        is_valid, metadata = validate_schema_filename("ManPage-Schema-v1.0.md")

        assert is_valid is False
        assert metadata is None

    def test_invalid_starting_with_number(self):
        """Test that domain starting with number is invalid."""
        is_valid, metadata = validate_schema_filename("42answers-schema-v1.0.md")

        assert is_valid is False
        assert metadata is None

    def test_invalid_starting_with_hyphen(self):
        """Test that domain starting with hyphen is invalid."""
        is_valid, metadata = validate_schema_filename("-manpage-schema-v1.0.md")

        assert is_valid is False
        assert metadata is None

    def test_invalid_special_characters(self):
        """Test that special characters in domain are invalid."""
        is_valid, metadata = validate_schema_filename("man_page-schema-v1.0.md")

        assert is_valid is False
        assert metadata is None


class TestSuggestSchemaFilename:
    """Tests for suggest_schema_filename function."""

    def test_suggest_simple_domain(self):
        """Test suggestion for simple domain."""
        filename = suggest_schema_filename("manpage", "1.0")
        assert filename == "manpage-schema-v1.0.md"

    def test_suggest_with_spaces(self):
        """Test suggestion normalizes spaces to hyphens."""
        filename = suggest_schema_filename("API Documentation", "1.0")
        assert filename == "api-documentation-schema-v1.0.md"

    def test_suggest_with_underscores(self):
        """Test suggestion normalizes underscores to hyphens."""
        filename = suggest_schema_filename("my_custom_type", "1.0")
        assert filename == "my-custom-type-schema-v1.0.md"

    def test_suggest_with_uppercase(self):
        """Test suggestion converts to lowercase."""
        filename = suggest_schema_filename("MyCustomType", "1.0")
        assert filename == "mycustomtype-schema-v1.0.md"

    def test_suggest_mixed_normalization(self):
        """Test suggestion with mixed case and separators."""
        filename = suggest_schema_filename("My_Custom Type", "1.0")
        assert filename == "my-custom-type-schema-v1.0.md"

    def test_suggest_higher_version(self):
        """Test suggestion with version > 1.0."""
        filename = suggest_schema_filename("manpage", "2.5")
        assert filename == "manpage-schema-v2.5.md"

    def test_suggest_double_digit_version(self):
        """Test suggestion with double-digit version."""
        filename = suggest_schema_filename("manpage", "10.25")
        assert filename == "manpage-schema-v10.25.md"

    def test_suggest_consecutive_hyphens(self):
        """Test suggestion removes consecutive hyphens."""
        filename = suggest_schema_filename("my--custom---type", "1.0")
        assert filename == "my-custom-type-schema-v1.0.md"

    def test_suggest_leading_trailing_hyphens(self):
        """Test suggestion removes leading/trailing hyphens."""
        filename = suggest_schema_filename("-my-type-", "1.0")
        assert filename == "my-type-schema-v1.0.md"

    def test_suggest_default_version(self):
        """Test suggestion uses default version 1.0."""
        filename = suggest_schema_filename("manpage")
        assert filename == "manpage-schema-v1.0.md"

    def test_suggest_empty_domain_raises_error(self):
        """Test that empty domain raises ValueError."""
        with pytest.raises(ValueError, match="Domain cannot be empty"):
            suggest_schema_filename("", "1.0")

    def test_suggest_invalid_version_format_raises_error(self):
        """Test that invalid version format raises ValueError."""
        with pytest.raises(ValueError, match="must be in format 'major.minor'"):
            suggest_schema_filename("manpage", "1")

    def test_suggest_invalid_version_parts_raises_error(self):
        """Test that non-integer version parts raise ValueError."""
        with pytest.raises(ValueError, match="major and minor must be integers"):
            suggest_schema_filename("manpage", "1.x")

    def test_suggest_negative_version_raises_error(self):
        """Test that negative version numbers raise ValueError."""
        with pytest.raises(ValueError, match="must be non-negative"):
            suggest_schema_filename("manpage", "-1.0")

    def test_suggest_without_normalization(self):
        """Test suggestion without normalization (must already be valid)."""
        filename = suggest_schema_filename("manpage", "1.0", normalize=False)
        assert filename == "manpage-schema-v1.0.md"

    def test_suggest_without_normalization_invalid_raises_error(self):
        """Test that invalid domain without normalization raises ValueError."""
        with pytest.raises(ValueError, match="Invalid domain"):
            suggest_schema_filename("My Custom Type", "1.0", normalize=False)


class TestExtractSchemaMetadata:
    """Tests for extract_schema_metadata function."""

    def test_extract_valid_metadata(self):
        """Test metadata extraction from valid filename."""
        metadata = extract_schema_metadata("manpage-schema-v1.0.md")

        assert metadata['domain'] == 'manpage'
        assert metadata['version'] == '1.0'
        assert metadata['major'] == 1
        assert metadata['minor'] == 0

    def test_extract_invalid_raises_error(self):
        """Test that invalid filename raises SchemaFilenameError."""
        with pytest.raises(SchemaFilenameError, match="Invalid schema filename"):
            extract_schema_metadata("invalid.json")


class TestGetValidationErrors:
    """Tests for get_validation_errors function."""

    def test_valid_filename_no_errors(self):
        """Test that valid filename returns empty error list."""
        errors = get_validation_errors("manpage-schema-v1.0.md")
        assert errors == []

    def test_wrong_extension_error(self):
        """Test error for wrong file extension."""
        errors = get_validation_errors("manpage-schema-v1.0.json")

        assert len(errors) > 0
        assert any("Extension must be '.md'" in e for e in errors)

    def test_missing_version_error(self):
        """Test error for missing version."""
        errors = get_validation_errors("manpage-schema.md")

        assert len(errors) > 0
        assert any("Missing version" in e for e in errors)

    def test_missing_schema_keyword_error(self):
        """Test error for missing schema keyword."""
        errors = get_validation_errors("manpage-v1.0.md")

        assert len(errors) > 0
        assert any("Missing '-schema-'" in e for e in errors)

    def test_uppercase_letters_error(self):
        """Test error for uppercase letters."""
        errors = get_validation_errors("ManPage-schema-v1.0.md")

        assert len(errors) > 0
        assert any("must be lowercase" in e for e in errors)

    def test_invalid_domain_error(self):
        """Test error for invalid domain format."""
        errors = get_validation_errors("42answer-schema-v1.0.md")

        assert len(errors) > 0
        # Should detect that domain doesn't start with letter


class TestIsValidSchemaFilename:
    """Tests for is_valid_schema_filename convenience function."""

    def test_is_valid_returns_true(self):
        """Test that valid filename returns True."""
        assert is_valid_schema_filename("manpage-schema-v1.0.md") is True

    def test_is_valid_returns_false(self):
        """Test that invalid filename returns False."""
        assert is_valid_schema_filename("invalid.json") is False


class TestFormatValidationMessage:
    """Tests for format_validation_message function."""

    def test_format_message_valid_filename(self):
        """Test formatting message for valid filename."""
        message = format_validation_message("manpage-schema-v1.0.md")

        assert "✅ Valid" in message
        assert "manpage-schema-v1.0.md" in message

    def test_format_message_invalid_filename(self):
        """Test formatting message for invalid filename."""
        message = format_validation_message("invalid.json")

        assert "❌ Invalid" in message
        assert "Errors:" in message
        assert "Expected format:" in message
        assert "Example:" in message

    def test_format_message_includes_suggestion(self):
        """Test that message includes filename suggestion."""
        message = format_validation_message("manpage.json")

        assert "Suggested filename:" in message
        # Should suggest something like manpage-schema-v1.0.md


class TestSchemaFilenamePattern:
    """Tests for the regex pattern itself."""

    def test_pattern_matches_valid_filenames(self):
        """Test that pattern matches all valid filename variations."""
        valid_filenames = [
            "manpage-schema-v1.0.md",
            "api-documentation-schema-v1.0.md",
            "arc42-schema-v1.0.md",
            "a-schema-v1.0.md",  # Single letter domain
            "my-long-domain-name-schema-v1.0.md",
            "manpage-schema-v10.25.md",  # Double digit versions
        ]

        for filename in valid_filenames:
            match = SCHEMA_FILENAME_PATTERN.match(filename)
            assert match is not None, f"Pattern should match {filename}"

    def test_pattern_rejects_invalid_filenames(self):
        """Test that pattern rejects invalid filenames."""
        invalid_filenames = [
            "manpage-schema-v1.0.json",  # Wrong extension
            "manpage-v1.0.md",  # Missing schema keyword
            "manpage-schema.md",  # Missing version
            "ManPage-schema-v1.0.md",  # Uppercase
            "42answer-schema-v1.0.md",  # Starts with number
            "-manpage-schema-v1.0.md",  # Starts with hyphen
            "man_page-schema-v1.0.md",  # Underscore in domain
            "manpage-schema-1.0.md",  # Missing 'v' prefix
            "manpage-schema-v1.md",  # Missing minor version
        ]

        for filename in invalid_filenames:
            match = SCHEMA_FILENAME_PATTERN.match(filename)
            assert match is None, f"Pattern should not match {filename}"


class TestEdgeCases:
    """Tests for edge cases and boundary conditions."""

    def test_very_long_domain_name(self):
        """Test with very long domain name."""
        long_domain = "a" * 100
        filename = suggest_schema_filename(long_domain, "1.0")
        assert is_valid_schema_filename(filename)

    def test_domain_with_many_hyphens(self):
        """Test domain with multiple hyphens."""
        filename = suggest_schema_filename("my-very-long-domain-name", "1.0")
        assert filename == "my-very-long-domain-name-schema-v1.0.md"
        assert is_valid_schema_filename(filename)

    def test_version_zero_zero(self):
        """Test with version 0.0."""
        filename = suggest_schema_filename("manpage", "0.0")
        assert filename == "manpage-schema-v0.0.md"
        assert is_valid_schema_filename(filename)

    def test_large_version_numbers(self):
        """Test with large version numbers."""
        filename = suggest_schema_filename("manpage", "999.999")
        assert filename == "manpage-schema-v999.999.md"
        assert is_valid_schema_filename(filename)
