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

This module provides:
- Database fixtures with test isolation
- Mock S3 storage using moto
- Test data factories for common scenarios
"""

import os
import pytest
import hashlib
from typing import Generator, BinaryIO
from unittest.mock import MagicMock, patch
import io

# 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")


# =============================================================================
# Test Data Factories
# =============================================================================


def create_test_file(content: bytes = None, size: int = 1024) -> io.BytesIO:
    """
    Create a test file with known content.

    Args:
        content: Specific content to use, or None to generate random-ish content
        size: Size of generated content if content is None

    Returns:
        BytesIO object with the content
    """
    if content is None:
        content = os.urandom(size)
    return io.BytesIO(content)


def compute_sha256(content: bytes) -> str:
    """Compute SHA256 hash of content as lowercase hex string."""
    return hashlib.sha256(content).hexdigest()


def compute_md5(content: bytes) -> str:
    """Compute MD5 hash of content as lowercase hex string."""
    return hashlib.md5(content).hexdigest()


def compute_sha1(content: bytes) -> str:
    """Compute SHA1 hash of content as lowercase hex string."""
    return hashlib.sha1(content).hexdigest()


# Known test data with pre-computed hashes
TEST_CONTENT_HELLO = b"Hello, World!"
TEST_HASH_HELLO = "dffd6021bb2bd5b0af676290809ec3a53191dd81c7f70a4b28688a362182986f"
TEST_MD5_HELLO = "65a8e27d8879283831b664bd8b7f0ad4"
TEST_SHA1_HELLO = "0a0a9f2a6772942557ab5355d76af442f8f65e01"

TEST_CONTENT_EMPTY = b""
# Note: Empty content should be rejected by the storage layer

TEST_CONTENT_BINARY = bytes(range(256))
TEST_HASH_BINARY = compute_sha256(TEST_CONTENT_BINARY)


# =============================================================================
# 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
def integration_client():
    """
    Create a test client for integration tests.

    Uses the real database and MinIO from docker-compose.local.yml.
    """
    from httpx import Client

    # Connect to the running orchard-server container
    base_url = os.environ.get("ORCHARD_TEST_URL", "http://localhost:8080")

    with Client(base_url=base_url, timeout=30.0) as client:
        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)


def upload_test_file(
    client,
    project: str,
    package: str,
    content: bytes,
    filename: str = "test.bin",
    tag: str = None,
) -> dict:
    """
    Helper function to upload a test file.

    Returns the upload response as a dict.
    """
    files = {"file": (filename, io.BytesIO(content), "application/octet-stream")}
    data = {}
    if tag:
        data["tag"] = tag

    response = client.post(
        f"/api/v1/project/{project}/{package}/upload",
        files=files,
        data=data if data else None,
    )
    assert response.status_code == 200, f"Upload failed: {response.text}"
    return response.json()


# =============================================================================
# S3 Direct Access Helpers (for integration tests)
# =============================================================================


def get_s3_client():
    """
    Create a boto3 S3 client for direct S3 access in integration tests.

    Uses environment variables for configuration (same as the app).
    Note: When running in container, S3 endpoint should be 'minio:9000' not 'localhost:9000'.
    """
    import boto3
    from botocore.config import Config

    config = Config(s3={"addressing_style": "path"})

    # Use the same endpoint as the app (minio:9000 in container, localhost:9000 locally)
    endpoint = os.environ.get("ORCHARD_S3_ENDPOINT", "http://minio:9000")

    return boto3.client(
        "s3",
        endpoint_url=endpoint,
        region_name=os.environ.get("ORCHARD_S3_REGION", "us-east-1"),
        aws_access_key_id=os.environ.get("ORCHARD_S3_ACCESS_KEY_ID", "minioadmin"),
        aws_secret_access_key=os.environ.get(
            "ORCHARD_S3_SECRET_ACCESS_KEY", "minioadmin"
        ),
        config=config,
    )


def get_s3_bucket():
    """Get the S3 bucket name from environment."""
    return os.environ.get("ORCHARD_S3_BUCKET", "orchard-artifacts")


def list_s3_objects_by_hash(sha256_hash: str) -> list:
    """
    List S3 objects that match a specific SHA256 hash.

    Uses the fruits/{hash[:2]}/{hash[2:4]}/{hash} key pattern.
    Returns list of matching object keys.
    """
    client = get_s3_client()
    bucket = get_s3_bucket()
    prefix = f"fruits/{sha256_hash[:2]}/{sha256_hash[2:4]}/{sha256_hash}"

    response = client.list_objects_v2(Bucket=bucket, Prefix=prefix)

    if "Contents" not in response:
        return []

    return [obj["Key"] for obj in response["Contents"]]


def count_s3_objects_by_prefix(prefix: str) -> int:
    """
    Count S3 objects with a given prefix.

    Useful for checking if duplicate uploads created multiple objects.
    """
    client = get_s3_client()
    bucket = get_s3_bucket()

    response = client.list_objects_v2(Bucket=bucket, Prefix=prefix)

    if "Contents" not in response:
        return 0

    return len(response["Contents"])


def s3_object_exists(sha256_hash: str) -> bool:
    """
    Check if an S3 object exists for a given SHA256 hash.
    """
    objects = list_s3_objects_by_hash(sha256_hash)
    return len(objects) > 0


def delete_s3_object_by_hash(sha256_hash: str) -> bool:
    """
    Delete an S3 object by its SHA256 hash (for test cleanup).
    """
    client = get_s3_client()
    bucket = get_s3_bucket()
    s3_key = f"fruits/{sha256_hash[:2]}/{sha256_hash[2:4]}/{sha256_hash}"

    try:
        client.delete_object(Bucket=bucket, Key=s3_key)
        return True
    except Exception:
        return False