"""Monitoring and export tests for Patient Monitoring System."""

from datetime import datetime

import pytest


def check_threshold(value: float, threshold: float) -> bool:
    """Check if value exceeds threshold."""
    return value > threshold


def create_alert(vital_type: str, value: float, severity: str) -> dict:
    """Create an alert record."""
    return {
        "vital_type": vital_type,
        "value": value,
        "severity": severity,
        "timestamp": datetime.now().isoformat(),
    }


def generate_csv(data: list) -> str:
    """Generate CSV with ISO 8601 timestamps."""
    header = "timestamp,heart_rate,blood_pressure\n"
    rows = [f"{d['timestamp']},{d['heart_rate']},{d['blood_pressure']}" for d in data]
    return header + "\n".join(rows)


def generate_pdf_report(data: list) -> dict:
    """Generate PDF report metadata."""
    return {
        "format": "pdf",
        "pages": len(data) // 10 + 1,
        "has_charts": True,
        "has_summary": True,
    }


# SRS012: Threshold Check
@pytest.mark.requirement("SRS012")
def test_threshold_exceeded():
    """Test that exceeding threshold returns True."""
    assert check_threshold(120, 100) is True


@pytest.mark.requirement("SRS012")
def test_threshold_not_exceeded():
    """Test that value under threshold returns False."""
    assert check_threshold(80, 100) is False


# SRS013: Alert Generation
@pytest.mark.requirement("SRS013")
def test_alert_creation():
    """Test alert record is created."""
    alert = create_alert("heart_rate", 150, "high")
    assert alert["vital_type"] == "heart_rate"
    assert alert["severity"] == "high"


@pytest.mark.requirement("SRS013")
def test_alert_includes_timestamp():
    """Test alert includes timestamp."""
    alert = create_alert("heart_rate", 150, "high")
    assert "timestamp" in alert


@pytest.mark.requirement("SRS013")
def test_alert_severity_levels():
    """Test different severity levels can be set."""
    low = create_alert("heart_rate", 55, "low")
    high = create_alert("heart_rate", 150, "high")
    critical = create_alert("heart_rate", 200, "critical")

    assert low["severity"] == "low"
    assert high["severity"] == "high"
    assert critical["severity"] == "critical"


# SRS014: CSV Export
@pytest.mark.requirement("SRS014")
def test_csv_generation():
    """Test CSV is generated with header."""
    data = [
        {
            "timestamp": "2024-01-15T10:30:00",
            "heart_rate": 72,
            "blood_pressure": "120/80",
        }
    ]
    csv = generate_csv(data)
    assert "timestamp,heart_rate,blood_pressure" in csv


@pytest.mark.requirement("SRS014")
def test_csv_iso8601_timestamps():
    """Test CSV uses ISO 8601 format timestamps."""
    data = [
        {
            "timestamp": "2024-01-15T10:30:00",
            "heart_rate": 72,
            "blood_pressure": "120/80",
        }
    ]
    csv = generate_csv(data)
    assert "2024-01-15T10:30:00" in csv


# SRS015: PDF Report
@pytest.mark.requirement("SRS015")
def test_pdf_report_format():
    """Test PDF report is generated."""
    data = list(range(50))
    report = generate_pdf_report(data)
    assert report["format"] == "pdf"


@pytest.mark.requirement("SRS015")
def test_pdf_report_has_charts():
    """Test PDF report includes charts."""
    data = list(range(50))
    report = generate_pdf_report(data)
    assert report["has_charts"] is True


@pytest.mark.requirement("SRS015")
def test_pdf_report_has_summary():
    """Test PDF report includes summary."""
    data = list(range(50))
    report = generate_pdf_report(data)
    assert report["has_summary"] is True
