"""
Test configuration and fixtures for Orchard backend tests.

This module provides:
- Database fixtures with test isolation
- Mock S3 storage using moto
- Shared pytest fixtures
"""

import os
import pytest


# =============================================================================
# Pytest Markers
# =============================================================================


def pytest_configure(config):
    """Register custom pytest markers."""
    config.addinivalue_line(
        "markers",
        "auth_intensive: marks tests that make many login requests (excluded from CI integration tests due to rate limiting)",
    )
    config.addinivalue_line(
        "markers",
        "integration: marks tests as integration tests",
    )
    config.addinivalue_line(
        "markers",
        "large: marks tests that handle large files (slow)",
    )
    config.addinivalue_line(
        "markers",
        "slow: marks tests as slow running",
    )


import io
from typing import Generator
from unittest.mock import MagicMock

# Set test environment defaults before importing app modules
# Use setdefault to NOT override existing env vars (from docker-compose)
os.environ.setdefault("ORCHARD_DATABASE_HOST", "localhost")
os.environ.setdefault("ORCHARD_DATABASE_PORT", "5432")
os.environ.setdefault("ORCHARD_DATABASE_USER", "test")
os.environ.setdefault("ORCHARD_DATABASE_PASSWORD", "test")
os.environ.setdefault("ORCHARD_DATABASE_DBNAME", "orchard_test")
os.environ.setdefault("ORCHARD_S3_ENDPOINT", "http://localhost:9000")
os.environ.setdefault("ORCHARD_S3_BUCKET", "test-bucket")
os.environ.setdefault("ORCHARD_S3_ACCESS_KEY_ID", "test")
os.environ.setdefault("ORCHARD_S3_SECRET_ACCESS_KEY", "test")

# Re-export factory functions for backward compatibility
from tests.factories import (
    create_test_file,
    compute_sha256,
    compute_md5,
    compute_sha1,
    upload_test_file,
    generate_content,
    generate_content_with_hash,
    TEST_CONTENT_HELLO,
    TEST_HASH_HELLO,
    TEST_MD5_HELLO,
    TEST_SHA1_HELLO,
    TEST_CONTENT_EMPTY,
    TEST_CONTENT_BINARY,
    TEST_HASH_BINARY,
    get_s3_client,
    get_s3_bucket,
    list_s3_objects_by_hash,
    count_s3_objects_by_prefix,
    s3_object_exists,
    delete_s3_object_by_hash,
)


# =============================================================================
# Mock Storage Fixtures
# =============================================================================


class MockS3Client:
    """Mock S3 client for unit testing without actual S3/MinIO."""

    def __init__(self):
        self.objects = {}  # key -> content
        self.bucket = "test-bucket"

    def put_object(self, Bucket: str, Key: str, Body: bytes) -> dict:
        self.objects[Key] = Body
        return {"ETag": f'"{compute_md5(Body)}"'}

    def get_object(self, Bucket: str, Key: str, **kwargs) -> dict:
        if Key not in self.objects:
            raise Exception("NoSuchKey")
        content = self.objects[Key]
        return {
            "Body": io.BytesIO(content),
            "ContentLength": len(content),
        }

    def head_object(self, Bucket: str, Key: str) -> dict:
        if Key not in self.objects:
            from botocore.exceptions import ClientError

            error_response = {"Error": {"Code": "404", "Message": "Not Found"}}
            raise ClientError(error_response, "HeadObject")
        content = self.objects[Key]
        return {
            "ContentLength": len(content),
            "ETag": f'"{compute_md5(content)}"',
        }

    def delete_object(self, Bucket: str, Key: str) -> dict:
        if Key in self.objects:
            del self.objects[Key]
        return {}

    def head_bucket(self, Bucket: str) -> dict:
        return {}

    def create_multipart_upload(self, Bucket: str, Key: str) -> dict:
        return {"UploadId": "test-upload-id"}

    def upload_part(
        self, Bucket: str, Key: str, UploadId: str, PartNumber: int, Body: bytes
    ) -> dict:
        return {"ETag": f'"{compute_md5(Body)}"'}

    def complete_multipart_upload(
        self, Bucket: str, Key: str, UploadId: str, MultipartUpload: dict
    ) -> dict:
        return {"ETag": '"test-etag"'}

    def abort_multipart_upload(self, Bucket: str, Key: str, UploadId: str) -> dict:
        return {}

    def generate_presigned_url(
        self, ClientMethod: str, Params: dict, ExpiresIn: int
    ) -> str:
        return f"https://test-bucket.s3.amazonaws.com/{Params['Key']}?presigned=true"


@pytest.fixture
def mock_s3_client() -> MockS3Client:
    """Provide a mock S3 client for unit tests."""
    return MockS3Client()


@pytest.fixture
def mock_storage(mock_s3_client):
    """
    Provide a mock storage instance for unit tests.

    Uses the MockS3Client to avoid actual S3/MinIO calls.
    """
    from app.storage import S3Storage

    storage = S3Storage.__new__(S3Storage)
    storage.client = mock_s3_client
    storage.bucket = "test-bucket"
    storage._active_uploads = {}

    return storage


# =============================================================================
# Database Fixtures (for integration tests)
# =============================================================================


@pytest.fixture(scope="session")
def test_db_url():
    """Get the test database URL."""
    return (
        f"postgresql://{os.environ['ORCHARD_DATABASE_USER']}:"
        f"{os.environ['ORCHARD_DATABASE_PASSWORD']}@"
        f"{os.environ['ORCHARD_DATABASE_HOST']}:"
        f"{os.environ['ORCHARD_DATABASE_PORT']}/"
        f"{os.environ['ORCHARD_DATABASE_DBNAME']}"
    )


# =============================================================================
# HTTP Client Fixtures (for API tests)
# =============================================================================


@pytest.fixture
def test_app():
    """
    Create a test FastAPI application.

    Note: This requires the database to be available for integration tests.
    For unit tests, use mock_storage fixture instead.
    """
    from fastapi.testclient import TestClient
    from app.main import app

    return TestClient(app)


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


@pytest.fixture(scope="session")
def integration_client():
    """
    Create an authenticated test client for integration tests.

    Uses the real database and MinIO from docker-compose.local.yml or deployed environment.
    Authenticates as admin for write operations. Session-scoped to reuse login across tests.

    Environment variables:
        ORCHARD_TEST_URL: Base URL of the Orchard server (default: http://localhost:8080)
        ORCHARD_TEST_USERNAME: Admin username for authentication (default: admin)
        ORCHARD_TEST_PASSWORD: Admin password for authentication (default: changeme123)
    """
    import httpx

    # Connect to the running orchard-server container or deployed environment
    base_url = os.environ.get("ORCHARD_TEST_URL", "http://localhost:8080")
    username = os.environ.get("ORCHARD_TEST_USERNAME", "admin")
    password = os.environ.get("ORCHARD_TEST_PASSWORD", "changeme123")

    with httpx.Client(base_url=base_url, timeout=30.0) as client:
        # Login as admin to enable write operations
        login_response = client.post(
            "/api/v1/auth/login",
            json={"username": username, "password": password},
        )
        if login_response.status_code != 200:
            pytest.fail(
                f"Authentication failed against {base_url}: {login_response.status_code} - {login_response.text}. "
                f"Set ORCHARD_TEST_USERNAME and ORCHARD_TEST_PASSWORD environment variables if using non-default credentials."
            )

        # Verify cookie was set
        if not client.cookies:
            pytest.fail(
                f"Login succeeded but no session cookie was set. Response headers: {login_response.headers}"
            )

        yield client


@pytest.fixture
def unique_test_id():
    """Generate a unique ID for test isolation."""
    import uuid

    return f"test-{uuid.uuid4().hex[:8]}"


@pytest.fixture
def test_project(integration_client, unique_test_id):
    """
    Create a test project and clean it up after the test.

    Yields the project name.
    """
    project_name = f"test-project-{unique_test_id}"

    # Create project
    response = integration_client.post(
        "/api/v1/projects",
        json={"name": project_name, "description": "Test project", "is_public": True},
    )
    assert response.status_code == 200, f"Failed to create project: {response.text}"

    yield project_name

    # Cleanup: delete project
    try:
        integration_client.delete(f"/api/v1/projects/{project_name}")
    except Exception:
        pass  # Ignore cleanup errors


@pytest.fixture
def test_package(integration_client, test_project, unique_test_id):
    """
    Create a test package within a test project.

    Yields (project_name, package_name) tuple.
    """
    package_name = f"test-package-{unique_test_id}"

    # Create package
    response = integration_client.post(
        f"/api/v1/project/{test_project}/packages",
        json={"name": package_name, "description": "Test package"},
    )
    assert response.status_code == 200, f"Failed to create package: {response.text}"

    yield (test_project, package_name)

    # Cleanup handled by test_project fixture (cascade delete)


@pytest.fixture
def test_content():
    """
    Generate unique test content for each test.

    Returns (content_bytes, expected_sha256) tuple.
    """
    import uuid

    content = f"test-content-{uuid.uuid4().hex}".encode()
    sha256 = compute_sha256(content)
    return (content, sha256)


@pytest.fixture
def sized_content():
    """
    Factory fixture for generating content of specific sizes.

    Usage:
        def test_example(sized_content):
            content, hash = sized_content(1024)  # 1KB
            content, hash = sized_content(1024 * 1024)  # 1MB
    """
    def _generate(size: int, seed: int = None):
        return generate_content_with_hash(size, seed)
    return _generate


# =============================================================================
# Size Constants for Tests
# =============================================================================

# Common file sizes for boundary testing
SIZE_1B = 1
SIZE_1KB = 1024
SIZE_10KB = 10 * 1024
SIZE_100KB = 100 * 1024
SIZE_1MB = 1024 * 1024
SIZE_5MB = 5 * 1024 * 1024
SIZE_10MB = 10 * 1024 * 1024
SIZE_50MB = 50 * 1024 * 1024
SIZE_100MB = 100 * 1024 * 1024
SIZE_250MB = 250 * 1024 * 1024
SIZE_500MB = 500 * 1024 * 1024
SIZE_1GB = 1024 * 1024 * 1024

# Chunk size boundaries (based on typical S3 multipart chunk sizes)
CHUNK_SIZE = 64 * 1024  # 64KB typical chunk
MULTIPART_THRESHOLD = 100 * 1024 * 1024  # 100MB multipart threshold