"""
Pytest configuration and fixtures.

Test categories:
- Unit tests: Run by default, no external dependencies
- Integration tests: Require Ollama, run with --run-integration
- E2E tests: Require running API server, run with --run-e2e

Usage:
    pytest tests/                           # Run unit tests only
    pytest tests/ --run-integration         # Include integration tests
    pytest tests/ --run-e2e                 # Include E2E tests
    pytest tests/ --run-integration --run-e2e  # Run all tests
"""
import os
import tempfile
from pathlib import Path

import pytest
from httpx import ASGITransport, AsyncClient

from src.main import app


# =============================================================================
# Command Line Options
# =============================================================================

def pytest_addoption(parser):
    """Add custom command line options."""
    parser.addoption(
        "--run-integration",
        action="store_true",
        default=False,
        help="Run integration tests (require Ollama to be running)",
    )
    parser.addoption(
        "--run-e2e",
        action="store_true",
        default=False,
        help="Run E2E tests (require API server to be running)",
    )
    parser.addoption(
        "--ollama-url",
        action="store",
        default="http://192.168.86.149:11434",
        help="Ollama API URL for integration tests",
    )
    parser.addoption(
        "--api-url",
        action="store",
        default="http://localhost:8095",
        help="Webber API URL for E2E tests",
    )


def pytest_collection_modifyitems(config, items):
    """Skip integration/e2e tests unless explicitly requested."""
    skip_integration = pytest.mark.skip(reason="need --run-integration option to run")
    skip_e2e = pytest.mark.skip(reason="need --run-e2e option to run")

    for item in items:
        if "integration" in item.keywords and not config.getoption("--run-integration"):
            item.add_marker(skip_integration)
        if "e2e" in item.keywords and not config.getoption("--run-e2e"):
            item.add_marker(skip_e2e)


# =============================================================================
# Basic Fixtures
# =============================================================================

@pytest.fixture
def anyio_backend():
    """Use asyncio for async tests."""
    return "asyncio"


@pytest.fixture
async def client():
    """Async HTTP client for testing (no auth)."""
    async with AsyncClient(
        transport=ASGITransport(app=app),
        base_url="http://test"
    ) as ac:
        yield ac


@pytest.fixture
async def auth_client():
    """Async HTTP client with API key for authenticated requests."""
    async with AsyncClient(
        transport=ASGITransport(app=app),
        base_url="http://test",
        headers={"X-API-Key": "test-api-key"}
    ) as ac:
        yield ac


# =============================================================================
# Integration Test Fixtures
# =============================================================================

@pytest.fixture
def ollama_url(request):
    """Get Ollama URL from command line or environment."""
    return request.config.getoption("--ollama-url") or os.environ.get(
        "OLLAMA_URL", "http://192.168.86.149:11434"
    )


@pytest.fixture
def api_url(request):
    """Get API URL from command line or environment."""
    return request.config.getoption("--api-url") or os.environ.get(
        "WEBBER_API_URL", "http://localhost:8095"
    )


@pytest.fixture
def sample_project():
    """Create a sample Python project for testing."""
    with tempfile.TemporaryDirectory() as tmpdir:
        project = Path(tmpdir)

        # Create a realistic project structure
        (project / "src").mkdir()
        (project / "tests").mkdir()

        # Main application file
        (project / "src" / "__init__.py").write_text("")
        (project / "src" / "main.py").write_text('''"""Main application module."""

def greet(name: str) -> str:
    """Greet someone by name.

    Args:
        name: The name to greet

    Returns:
        A greeting string
    """
    return f"Hello, {name}!"


def add(a: int, b: int) -> int:
    """Add two numbers.

    Args:
        a: First number
        b: Second number

    Returns:
        Sum of a and b
    """
    return a + b


def divide(a: float, b: float) -> float:
    """Divide two numbers.

    Args:
        a: Dividend
        b: Divisor

    Returns:
        Result of a / b

    Raises:
        ValueError: If b is zero
    """
    if b == 0:
        raise ValueError("Cannot divide by zero")
    return a / b


if __name__ == "__main__":
    print(greet("World"))
''')

        # Utility module
        (project / "src" / "utils.py").write_text('''"""Utility functions."""

def is_even(n: int) -> bool:
    """Check if a number is even."""
    return n % 2 == 0


def is_prime(n: int) -> bool:
    """Check if a number is prime."""
    if n < 2:
        return False
    for i in range(2, int(n ** 0.5) + 1):
        if n % i == 0:
            return False
    return True


def factorial(n: int) -> int:
    """Calculate factorial recursively."""
    if n <= 1:
        return 1
    return n * factorial(n - 1)


def fibonacci(n: int) -> list[int]:
    """Generate Fibonacci sequence up to n terms."""
    if n <= 0:
        return []
    if n == 1:
        return [0]

    fib = [0, 1]
    for _ in range(2, n):
        fib.append(fib[-1] + fib[-2])
    return fib
''')

        # Test file
        (project / "tests" / "__init__.py").write_text("")
        (project / "tests" / "test_main.py").write_text('''"""Tests for main module."""
import pytest
from src.main import greet, add, divide


def test_greet():
    assert greet("World") == "Hello, World!"


def test_add():
    assert add(2, 3) == 5


def test_divide():
    assert divide(10, 2) == 5.0


def test_divide_by_zero():
    with pytest.raises(ValueError):
        divide(1, 0)
''')

        # README
        (project / "README.md").write_text('''# Sample Project

A simple Python project for testing Webber's code exploration.

## Features

- Greeting functionality
- Math utilities
- Comprehensive test suite

## Usage

```python
from src.main import greet, add
print(greet("World"))
print(add(2, 3))
```

## Testing

```bash
pytest tests/
```
''')

        # Configuration files
        (project / "pyproject.toml").write_text('''[project]
name = "sample-project"
version = "0.1.0"

[tool.pytest.ini_options]
testpaths = ["tests"]
''')

        yield project


@pytest.fixture
def sample_project_with_bug():
    """Create a sample project with intentional bugs for testing."""
    with tempfile.TemporaryDirectory() as tmpdir:
        project = Path(tmpdir)

        (project / "buggy.py").write_text('''"""Module with intentional bugs."""

def divide_numbers(a, b):
    """Divide two numbers - BUG: no zero check."""
    return a / b  # BUG: ZeroDivisionError if b is 0


def get_item(lst, index):
    """Get item from list - BUG: no bounds check."""
    return lst[index]  # BUG: IndexError if out of bounds


def parse_int(s):
    """Parse string to int - BUG: no error handling."""
    return int(s)  # BUG: ValueError if not a valid int


# TODO: Fix the division bug
# FIXME: Add bounds checking to get_item
''')

        yield project


# =============================================================================
# E2E Test Fixtures
# =============================================================================

@pytest.fixture
async def live_client(api_url):
    """HTTP client for E2E tests against running server."""
    async with AsyncClient(base_url=api_url, timeout=30.0) as client:
        yield client


# =============================================================================
# Helper Functions
# =============================================================================

def assert_contains_any(text: str, substrings: list[str], case_sensitive: bool = False) -> bool:
    """Assert that text contains at least one of the substrings."""
    check_text = text if case_sensitive else text.lower()
    check_subs = substrings if case_sensitive else [s.lower() for s in substrings]

    found = [s for s in check_subs if s in check_text]
    assert found, f"Expected text to contain one of {substrings}, but none found in: {text[:200]}..."
    return True


def assert_contains_all(text: str, substrings: list[str], case_sensitive: bool = False) -> bool:
    """Assert that text contains all of the substrings."""
    check_text = text if case_sensitive else text.lower()
    check_subs = substrings if case_sensitive else [s.lower() for s in substrings]

    missing = [s for s in check_subs if s not in check_text]
    assert not missing, f"Expected text to contain all of {substrings}, missing: {missing}"
    return True