"""Data handling tests for Patient Monitoring System."""

from datetime import datetime, timedelta

import pytest


def establish_websocket(endpoint: str) -> dict:
    """Simulated WebSocket connection."""
    return {"connected": True, "endpoint": endpoint}


def poll_device_api() -> dict:
    """Simulated device API polling."""
    return {
        "heart_rate": 72,
        "blood_pressure": "120/80",
        "timestamp": datetime.now().isoformat(),
    }


def write_vital_signs(data: dict) -> bool:
    """Simulated database write."""
    return "timestamp" in data and "heart_rate" in data


def get_retention_policy() -> int:
    """Get data retention period in years."""
    return 7


def query_vital_signs(
    patient_id: str, start_date: datetime, end_date: datetime
) -> list:
    """Simulated indexed query for vital signs."""
    # Simulate returning paginated results
    return [{"heart_rate": 72, "timestamp": start_date.isoformat()}]


def paginate_results(results: list, page: int, page_size: int = 100) -> dict:
    """Paginate query results."""
    start = page * page_size
    end = start + page_size
    return {
        "data": results[start:end],
        "page": page,
        "page_size": page_size,
        "total": len(results),
    }


# SRS006: WebSocket Connection
@pytest.mark.requirement("SRS006")
def test_websocket_connection():
    """Test WebSocket connection for real-time data."""
    conn = establish_websocket("wss://monitor.example.com/vitals")
    assert conn["connected"] is True


@pytest.mark.requirement("SRS006")
def test_websocket_endpoint():
    """Test WebSocket connects to correct endpoint."""
    conn = establish_websocket("wss://monitor.example.com/vitals")
    assert "vitals" in conn["endpoint"]


# SRS007: Data Polling
@pytest.mark.requirement("SRS007")
def test_device_api_polling():
    """Test device API returns vital signs."""
    data = poll_device_api()
    assert "heart_rate" in data
    assert "blood_pressure" in data


@pytest.mark.requirement("SRS007")
def test_polling_includes_timestamp():
    """Test that polled data includes timestamp."""
    data = poll_device_api()
    assert "timestamp" in data


# SRS008: Database Write
@pytest.mark.requirement("SRS008")
def test_vital_signs_write():
    """Test vital signs are written to database."""
    data = {"heart_rate": 72, "timestamp": datetime.now().isoformat()}
    assert write_vital_signs(data) is True


@pytest.mark.requirement("SRS008")
def test_write_requires_timestamp():
    """Test that write requires timestamp."""
    data = {"heart_rate": 72}
    assert write_vital_signs(data) is False


# SRS009: Data Retention
@pytest.mark.requirement("SRS009")
def test_retention_policy():
    """Test data retention is 7 years."""
    assert get_retention_policy() == 7


# SRS010: Query Optimization
@pytest.mark.requirement("SRS010")
def test_indexed_query():
    """Test date range query returns results."""
    start = datetime.now() - timedelta(days=7)
    end = datetime.now()
    results = query_vital_signs("patient123", start, end)
    assert len(results) > 0


# SRS011: Pagination
@pytest.mark.requirement("SRS011")
def test_pagination_default_page_size():
    """Test pagination uses 100 records per page."""
    results = list(range(250))
    page = paginate_results(results, 0)
    assert page["page_size"] == 100


@pytest.mark.requirement("SRS011")
def test_pagination_returns_correct_page():
    """Test pagination returns correct page data."""
    results = list(range(250))
    page = paginate_results(results, 1)
    assert page["page"] == 1
    assert len(page["data"]) == 100
