"""Tests for fan curve logic."""
import pytest
from backend.fan_control import FanCurveManager, FanCurvePoint


def test_parse_curve():
    """Test parsing fan curve from JSON."""
    json_data = '[{"temp": 30, "speed": 20}, {"temp": 50, "speed": 50}, {"temp": 70, "speed": 100}]'
    curve = FanCurveManager.parse_curve(json_data)
    
    assert len(curve) == 3
    assert curve[0].temp == 30
    assert curve[0].speed == 20


def test_parse_invalid_curve():
    """Test parsing invalid curve returns default."""
    curve = FanCurveManager.parse_curve("invalid json")
    
    assert len(curve) == 6  # Default curve has 6 points
    assert curve[0].temp == 30
    assert curve[0].speed == 10


def test_calculate_speed_below_min():
    """Test speed calculation below minimum temperature."""
    curve = [
        FanCurvePoint(30, 10),
        FanCurvePoint(50, 50),
        FanCurvePoint(70, 100),
    ]
    
    speed = FanCurveManager.calculate_speed(curve, 20)
    assert speed == 10


def test_calculate_speed_above_max():
    """Test speed calculation above maximum temperature."""
    curve = [
        FanCurvePoint(30, 10),
        FanCurvePoint(50, 50),
        FanCurvePoint(70, 100),
    ]
    
    speed = FanCurveManager.calculate_speed(curve, 80)
    assert speed == 100


def test_calculate_speed_interpolation():
    """Test speed calculation with interpolation."""
    curve = [
        FanCurvePoint(30, 10),
        FanCurvePoint(50, 50),
        FanCurvePoint(70, 100),
    ]
    
    # At 40°C, should be halfway between 10% and 50%
    speed = FanCurveManager.calculate_speed(curve, 40)
    assert speed == 30


def test_calculate_speed_exact_point():
    """Test speed calculation at exact curve point."""
    curve = [
        FanCurvePoint(30, 10),
        FanCurvePoint(50, 50),
    ]
    
    speed = FanCurveManager.calculate_speed(curve, 50)
    assert speed == 50


def test_serialize_curve():
    """Test serializing curve to JSON."""
    points = [
        FanCurvePoint(30, 10),
        FanCurvePoint(50, 50),
    ]
    
    json_data = FanCurveManager.serialize_curve(points)
    assert "30" in json_data
    assert "10" in json_data
    assert "50" in json_data