using System;
using System.Diagnostics;
using System.Linq;
using System.Management;
using System.Threading.Tasks;

namespace WoRCP
{
    class ResourceReader
    {
        //Main
        #region Variables
        public static double CPU = 0;
        public static double Mem = 0;
        public static double DiskR = 0;
        public static double DiskW = 0;
        public static double Temprature = 0;
        private static PerformanceCounter CPUUsage;
        private static PerformanceCounter Memory;
        private static PerformanceCounter DiskRead;
        private static PerformanceCounter DiskWrite;
        private static ManagementObject Temp;
        private static ManagementObjectSearcher searcher;
        #endregion

        //Methods
        #region Defining the counters
        public static async void DefineCounters()
        {
            if (!Configuration.CountersDefined)
            {
                Program.Log("[Info] Defining resource counters... (This process might take a while)");
                await Task.Run(() =>
                {
                    CPUUsage = new PerformanceCounter("Processor", "% Processor Time", "_Total", true);
                    Memory = new PerformanceCounter("Memory", "Available MBytes", true);
                    DiskRead = new PerformanceCounter("LogicalDisk", "Disk Read Bytes/Sec", "_Total", true);
                    DiskWrite = new PerformanceCounter("LogicalDisk", "Disk Write Bytes/Sec", "_Total", true);
                    searcher = new ManagementObjectSearcher(@"root\CIMV2", "SELECT * FROM Win32_PerfFormattedData_Counters_ThermalZoneInformation");
                    Configuration.CountersDefined = true;
                    Program.Log("[Info] Resource counters defined.");
                });
            }
            else
            {
                Program.Log("[Warn] Resource counters are already defined.");
            }
        }
        #endregion

        #region Reading
        public static void Read()
        {
            try
            {
                CPU = Math.Round(CPUUsage.NextValue());
                Mem = Configuration.Totalmemory - Math.Round(Memory.NextValue() / 1024, 1);
                DiskR = Math.Round(DiskRead.NextValue() / 1024 / 1024, 1);
                DiskW = Math.Round(DiskWrite.NextValue() / 1024 / 1024, 1);
                Temp = searcher.Get().OfType<ManagementObject>().First();
                Temprature = (Convert.ToDouble(Temp.GetPropertyValue("HighPrecisionTemperature").ToString()) - 2732) / 10;
            }
            catch
            {
                Program.Log("[Error] Resource counters are undefined, Unable to read.");
            }
        }
        #endregion
    }
}