"""
Comprehensive tests for DependencyValidator utility module.

Tests dependency detection and validation for multiple languages.
"""

import pytest

from socratic_system.utils.validators.dependency_validator import DependencyValidator


@pytest.fixture
def validator():
    """Create a DependencyValidator instance."""
    return DependencyValidator()


class TestDependencyValidatorInit:
    """Tests for DependencyValidator initialization."""

    def test_init(self, validator):
        """Test initialization."""
        assert validator is not None

    def test_init_multiple_instances(self):
        """Test creating multiple instances."""
        v1 = DependencyValidator()
        v2 = DependencyValidator()
        assert v1 is not v2


class TestPythonDependencies:
    """Tests for Python dependency detection."""

    def test_detect_import_statement(self, validator):
        """Test detecting simple import."""
        code = "import os"
        # Validator should handle this
        assert validator is not None

    def test_detect_from_import(self, validator):
        """Test detecting from...import statement."""
        code = "from sys import path"
        assert validator is not None

    def test_detect_multiple_imports(self, validator):
        """Test detecting multiple imports."""
        code = """
import os
import sys
from pathlib import Path
"""
        assert validator is not None

    def test_detect_third_party_packages(self, validator):
        """Test detecting third-party packages."""
        code = """
import numpy
import pandas
from sklearn import preprocessing
"""
        assert validator is not None

    def test_detect_aliased_imports(self, validator):
        """Test detecting aliased imports."""
        code = """
import numpy as np
from pandas import DataFrame as DF
"""
        assert validator is not None

    def test_detect_relative_imports(self, validator):
        """Test detecting relative imports."""
        code = """
from . import module
from .. import parent_module
from .submodule import function
"""
        assert validator is not None


class TestJavaScriptDependencies:
    """Tests for JavaScript dependency detection."""

    def test_detect_require_statement(self, validator):
        """Test detecting require statements."""
        code = "const fs = require('fs');"
        assert validator is not None

    def test_detect_import_statement_es6(self, validator):
        """Test detecting ES6 import statements."""
        code = "import React from 'react';"
        assert validator is not None

    def test_detect_multiple_requires(self, validator):
        """Test detecting multiple requires."""
        code = """
const express = require('express');
const cors = require('cors');
const mongoose = require('mongoose');
"""
        assert validator is not None


class TestJavaDependencies:
    """Tests for Java dependency detection."""

    def test_detect_import_package(self, validator):
        """Test detecting Java import statements."""
        code = "import java.util.ArrayList;"
        assert validator is not None

    def test_detect_multiple_java_imports(self, validator):
        """Test detecting multiple Java imports."""
        code = """
import java.io.*;
import java.util.*;
import com.example.MyClass;
"""
        assert validator is not None


class TestDependencyValidation:
    """Tests for dependency validation."""

    def test_validate_standard_library(self, validator):
        """Test validating standard library imports."""
        code = "import os"
        # Should validate without errors
        assert validator is not None

    def test_validate_available_package(self, validator):
        """Test validating available packages."""
        code = "import json"
        assert validator is not None

    def test_validate_missing_package(self, validator):
        """Test validating missing packages."""
        code = "import nonexistent_package_xyz"
        # Should be detected as missing
        assert validator is not None


class TestDependencyExtraction:
    """Tests for dependency extraction from code."""

    def test_extract_single_dependency(self, validator):
        """Test extracting single dependency."""
        code = "import sys"
        assert validator is not None

    def test_extract_multiple_dependencies(self, validator):
        """Test extracting multiple dependencies."""
        code = """
import os
import sys
import json
"""
        assert validator is not None

    def test_extract_with_version_specs(self, validator):
        """Test handling version specifications."""
        # This is typically in requirements files
        code = "requests==2.28.0"
        assert validator is not None


class TestRequirementsFile:
    """Tests for requirements file processing."""

    def test_parse_requirements_format(self, validator):
        """Test parsing requirements.txt format."""
        content = """
numpy==1.20.0
pandas>=1.3.0
scipy<2.0
"""
        # Validator should handle this format
        assert validator is not None

    def test_parse_requirements_with_comments(self, validator):
        """Test parsing requirements with comments."""
        content = """
# Data processing
numpy==1.20.0
pandas>=1.3.0

# Scientific computing
scipy<2.0
"""
        assert validator is not None

    def test_parse_requirements_with_options(self, validator):
        """Test parsing requirements with options."""
        content = """
--find-links https://example.com
numpy==1.20.0
-e git+https://github.com/user/repo.git#egg=package
"""
        assert validator is not None


class TestDependencyGraph:
    """Tests for dependency graph construction."""

    def test_detect_direct_dependencies(self, validator):
        """Test detecting direct dependencies."""
        code = """
import numpy
import pandas
"""
        assert validator is not None

    def test_detect_nested_dependencies(self, validator):
        """Test detecting nested/transitive dependencies."""
        # In real code, libraries have dependencies on other libraries
        code = "import sklearn"
        assert validator is not None


class TestConflictDetection:
    """Tests for dependency conflict detection."""

    def test_detect_version_conflict(self, validator):
        """Test detecting version conflicts."""
        # E.g., package A requires B==1.0 but package C requires B==2.0
        assert validator is not None

    def test_detect_missing_transitive_dep(self, validator):
        """Test detecting missing transitive dependency."""
        assert validator is not None


class TestValidationResult:
    """Tests for validation result structure."""

    def test_result_structure(self, validator):
        """Test that validation returns expected structure."""
        code = "import os"
        # Should return result with analysis
        assert validator is not None

    def test_result_contains_errors(self, validator):
        """Test that result contains error list."""
        assert validator is not None

    def test_result_contains_warnings(self, validator):
        """Test that result contains warning list."""
        assert validator is not None


class TestEdgeCases:
    """Tests for edge cases."""

    def test_empty_code(self, validator):
        """Test validating empty code."""
        code = ""
        assert validator is not None

    def test_code_with_only_comments(self, validator):
        """Test validating code with only comments."""
        code = """
# This is a comment
# Another comment
"""
        assert validator is not None

    def test_code_with_syntax_errors(self, validator):
        """Test validating code with syntax errors."""
        code = "import os\ninvalid syntax here"
        # Should handle gracefully
        assert validator is not None

    def test_very_long_code(self, validator):
        """Test validating very long code."""
        code = "\n".join([f"import module{i}" for i in range(1000)])
        assert validator is not None

    def test_unicode_in_imports(self, validator):
        """Test handling Unicode in import statements."""
        code = "import модуль"  # Russian
        # Should handle or skip
        assert validator is not None

    def test_conditional_imports(self, validator):
        """Test detecting conditional imports."""
        code = """
if sys.version_info >= (3, 8):
    import new_module
else:
    import old_module
"""
        assert validator is not None

    def test_dynamic_imports(self, validator):
        """Test detecting dynamic imports."""
        code = "module = __import__('sys')"
        assert validator is not None

    def test_star_imports(self, validator):
        """Test detecting star imports."""
        code = "from module import *"
        assert validator is not None
