"""Unit tests for PyPI proxy functionality."""

import pytest
from app.pypi_proxy import _parse_requires_dist


class TestParseRequiresDist:
    """Tests for _parse_requires_dist function."""

    def test_simple_package(self):
        """Test parsing a simple package name."""
        name, version = _parse_requires_dist("numpy")
        assert name == "numpy"
        assert version is None

    def test_package_with_version(self):
        """Test parsing package with version constraint."""
        name, version = _parse_requires_dist("numpy>=1.21.0")
        assert name == "numpy"
        assert version == ">=1.21.0"

    def test_package_with_parenthesized_version(self):
        """Test parsing package with parenthesized version."""
        name, version = _parse_requires_dist("requests (>=2.25.0)")
        assert name == "requests"
        assert version == ">=2.25.0"

    def test_package_with_python_version_marker(self):
        """Test that python_version markers are preserved but marker stripped."""
        name, version = _parse_requires_dist("typing-extensions; python_version < '3.8'")
        assert name == "typing-extensions"
        assert version is None

    def test_filters_extra_dependencies(self):
        """Test that extra dependencies are filtered out."""
        # Extra dependencies should return (None, None)
        name, version = _parse_requires_dist("pytest; extra == 'test'")
        assert name is None
        assert version is None

        name, version = _parse_requires_dist("sphinx; extra == 'docs'")
        assert name is None
        assert version is None

    def test_filters_platform_specific_darwin(self):
        """Test that macOS-specific dependencies are filtered out."""
        name, version = _parse_requires_dist("pyobjc; sys_platform == 'darwin'")
        assert name is None
        assert version is None

    def test_filters_platform_specific_win32(self):
        """Test that Windows-specific dependencies are filtered out."""
        name, version = _parse_requires_dist("pywin32; sys_platform == 'win32'")
        assert name is None
        assert version is None

    def test_filters_platform_system_marker(self):
        """Test that platform_system markers are filtered out."""
        name, version = _parse_requires_dist("jaraco-windows; platform_system == 'Windows'")
        assert name is None
        assert version is None

    def test_normalizes_package_name(self):
        """Test that package names are normalized (PEP 503)."""
        name, version = _parse_requires_dist("Typing_Extensions>=3.7.4")
        assert name == "typing-extensions"
        assert version == ">=3.7.4"

    def test_complex_version_constraint(self):
        """Test parsing complex version constraints."""
        name, version = _parse_requires_dist("gast!=0.5.0,!=0.5.1,!=0.5.2,>=0.2.1")
        assert name == "gast"
        assert version == "!=0.5.0,!=0.5.1,!=0.5.2,>=0.2.1"

    def test_version_range(self):
        """Test parsing version range constraints."""
        name, version = _parse_requires_dist("grpcio<2.0,>=1.24.3")
        assert name == "grpcio"
        assert version == "<2.0,>=1.24.3"

    def test_tilde_version(self):
        """Test parsing tilde version constraints."""
        name, version = _parse_requires_dist("tensorboard~=2.20.0")
        assert name == "tensorboard"
        assert version == "~=2.20.0"