using System;
using System.Diagnostics;
using System.Management;
using ATxCommon;
using NLog;
using NLog.Config;
using NLog.Targets;

namespace ATxDiagnostics
{
    class ATxDiagnostics
    {
        private static readonly Logger Log = LogManager.GetCurrentClassLogger();

        static void Main(string[] args) {
            var loglevel = LogLevel.Debug;
            if (args.Length > 0 && args[0] == "trace") {
                loglevel = LogLevel.Trace;
            }
            var logConfig = new LoggingConfiguration();
            var logTargetConsole = new ConsoleTarget {
                Name = "console",
                Header = "AutoTx Diagnostics",
                Layout = @"${time} [${level}] ${message}",
            };
            logConfig.AddTarget(logTargetConsole);
            var logRuleConsole = new LoggingRule("*", loglevel, logTargetConsole);
            logConfig.LoggingRules.Add(logRuleConsole);
            LogManager.Configuration = logConfig;

            Log.Debug(Conv.BytesToString(SystemChecks.GetFreeDriveSpace("C:")));
            GetCpuCounter();
            /*
            Log.Debug(SystemChecks.GetCpuUsage());
            Log.Debug(SystemChecks.GetCpuUsage());
            Log.Debug(SystemChecks.GetCpuUsage());
            Log.Debug(SystemChecks.GetCpuUsage());
            Log.Debug(SystemChecks.GetCpuUsage());
            */
            Log.Debug(SystemChecks.GetCpuUsage());
            Log.Debug(QueryCpuLoad());
        }

        private static int QueryCpuLoad() {
            Log.Trace("Querying WMI for CPU load...");
            var watch = Stopwatch.StartNew();
            var queryString = "SELECT Name, PercentProcessorTime " +
                              "FROM Win32_PerfFormattedData_PerfOS_Processor";
            var opts = new EnumerationOptions {
                Timeout = new TimeSpan(0, 0, 10),
                ReturnImmediately = false,
            };
            var searcher = new ManagementObjectSearcher("", queryString, opts);
            Int32 usageInt32 = -1;


            var managementObjects = searcher.Get();
            if (managementObjects.Count == 0) {
                Log.Error("No objects returned from WMI!");
                watch.Stop();
                Log.Debug("WMI query took {0} ms.", watch.ElapsedMilliseconds);
                return -1;
            }
            Log.Trace("WMI query returned {0} objects.", managementObjects.Count);
            foreach (var mo in managementObjects) {
                var obj = (ManagementObject)mo;
                var usage = obj["PercentProcessorTime"];
                var name = obj["Name"];
                    
                usageInt32 = Convert.ToInt32(usage);
                Log.Trace("CPU usage {1}: {0}", usageInt32, name);

            }

            managementObjects.Dispose();
            searcher.Dispose();

            watch.Stop();
            Log.Debug("WMI query took {0} ms.", watch.ElapsedMilliseconds);

            return usageInt32;
        }

        private static void GetCpuCounter() {
            var counter = new PerformanceCounter("Processor", "% Processor Time", "_Total");
            var i = 0;
            while (true) {
                i++;
                //Log.Debug("PerformanceCounter reading {1}: {0}", counter.NextValue(), i);
                var watch = Stopwatch.StartNew();
                var reading = counter.NextValue();
                watch.Stop();
                Console.WriteLine("reading {1} (took {2} ms): {0}", reading, i, watch.ElapsedMilliseconds);
                System.Threading.Thread.Sleep(250);
            }
        }
    }
}