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// ==============================================================================

// BatteryMonitor.cs - Battery status monitoring service

// Uses SystemInformation.PowerStatus to get battery percentage and time remaining.

// ==============================================================================

// CHANGE LOG:

// [2026-01-05] - Claude - Removed JustReachedFullCharge property. Uptime tracking

// now handled in MainWindow based on unplug detection.

// ==============================================================================

using System.Windows.Forms;

namespace PowerSwitchOverlay;

/// <summary>

/// Monitors battery status including charge percentage, time remaining, and charging state.

/// Uses Windows Forms SystemInformation.PowerStatus API.

/// </summary>

public class BatteryMonitor

{

/// <summary>Current battery charge percentage (0-100).</summary>

public int Percentage { get; private set; }

/// <summary>Estimated time remaining on battery. Zero if unknown or charging.</summary>

public TimeSpan TimeRemaining { get; private set; }

/// <summary>True if the system is plugged in and charging.</summary>

public bool IsCharging { get; private set; }

/// <summary>True if the system has a battery. False for desktops.</summary>

public bool HasBattery { get; private set; }

public BatteryMonitor()

{

Refresh();

}

/// <summary>

/// Refreshes battery status from system.

/// </summary>

public void Refresh()

{

try

{

var status = SystemInformation.PowerStatus;

// Check if system has a battery

HasBattery = status.BatteryChargeStatus != BatteryChargeStatus.NoSystemBattery;

if (!HasBattery)

{

Percentage = 100;

TimeRemaining = TimeSpan.Zero;

IsCharging = true;

return;

}

// Get battery percentage (0.0 to 1.0)

Percentage = (int)(status.BatteryLifePercent * 100);

// Clamp to valid range

Percentage = Math.Clamp(Percentage, 0, 100);

// Check charging status

IsCharging = status.PowerLineStatus == PowerLineStatus.Online;

// Get time remaining (in seconds, -1 if unknown)

int secondsRemaining = status.BatteryLifeRemaining;

if (secondsRemaining > 0)

{

TimeRemaining = TimeSpan.FromSeconds(secondsRemaining);

}

else

{

TimeRemaining = TimeSpan.Zero;

}

}

catch

{

// Default values on error

Percentage = 0;

TimeRemaining = TimeSpan.Zero;

IsCharging = false;

HasBattery = false;

}

}

}