Program.cs

// Copyright (c) Microsoft Corporation. All rights reserved.

using System.Diagnostics;
using System.Text.Json;

// Step 1: Run powercfg /sleepstudy /json
Console.WriteLine("Running powercfg /sleepstudy /json...");
string sleepStudyJson = RunPowerCfgSleepStudy();

if (string.IsNullOrEmpty(sleepStudyJson))
{
    Console.Error.WriteLine("No sleep study data returned. Make sure to run as Administrator.");
    return 1;
}

// Step 2: Parse and collect all PowerSnapData entries
using var doc = JsonDocument.Parse(sleepStudyJson);
var root = doc.RootElement;
var writeOptions = new JsonSerializerOptions { WriteIndented = true };

var events = new List<JsonElement>();

if (root.TryGetProperty("ScenarioInstances", out var scenarios) && scenarios.ValueKind == JsonValueKind.Array)
{
    foreach (var scenario in scenarios.EnumerateArray())
    {
        if (scenario.TryGetProperty("PowerSnapData", out var powerSnapData) && powerSnapData.ValueKind == JsonValueKind.Array)
        {
            foreach (var powerSnapEvent in powerSnapData.EnumerateArray())
            {
                events.Add(powerSnapEvent.Clone());
            }
        }
    }
}

// Step 3: Write all events to powersnap-events.json
string outputPath = "powersnap-events.json";
string json = JsonSerializer.Serialize(events, writeOptions);
File.WriteAllText(outputPath, json);

Console.WriteLine($"Total PowerSnap events: {events.Count}");
Console.WriteLine($"Output written to: {Path.GetFullPath(outputPath)}");
return 0;

// ─── Helper methods ───

static string RunPowerCfgSleepStudy()
{
    string outputFile = Path.Combine(Path.GetTempPath(), "sleepstudy-temp.json");

    try
    {
        using var process = new Process();
        process.StartInfo = new ProcessStartInfo
        {
            FileName = "powercfg",
            Arguments = $"/sleepstudy /json /output \"{outputFile}\"",
            UseShellExecute = false,
            RedirectStandardOutput = true,
            RedirectStandardError = true,
            CreateNoWindow = true
        };

        process.Start();
        process.WaitForExit();

        if (process.ExitCode != 0)
        {
            string error = process.StandardError.ReadToEnd();
            throw new Exception($"powercfg failed with exit code {process.ExitCode}: {error}");
        }

        if (File.Exists(outputFile))
        {
            return File.ReadAllText(outputFile);
        }
        else
        {
            throw new Exception("Sleep study report was not generated. The command may have failed.");
        }
    }
    finally
    {
        if (File.Exists(outputFile))
        {
            try { File.Delete(outputFile); }
            catch { Console.Error.WriteLine($"Warning: Could not delete temp file: {outputFile}"); }
        }
    }
}