/*
 * Little Software Stats - .NET Library
 * Copyright (C) 2008-2012 Little Apps (http://www.little-apps.org)
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

using System.Collections.Generic;
using System.Linq;
using System.Text.RegularExpressions;
using SystemInfoLibrary.Hardware.CPU;
using SystemInfoLibrary.Hardware.GPU;
using SystemInfoLibrary.Hardware.RAM;

namespace SystemInfoLibrary.Hardware
{
    internal sealed class LinuxHardwareInfo : HardwareInfo
    {
        private string _cpuInfo;


        private IList<CPUInfo> _CPUs;

        private IList<GPUInfo> _GPUs;

        private RAMInfo _RAM;


        public LinuxHardwareInfo()
        {
            // -- CPU
            _cpuInfo = string.Empty;
            _CPUs = new List<CPUInfo>();
            IEnumerable<int> procIndexes;
            List<string> matches;
            try
            {
                matches = new Regex(@"^\s*$", RegexOptions.Multiline).Split(CPU_Info)
                    .Where(val => !string.IsNullOrEmpty(val)).ToList();

                procIndexes = matches.Select(match =>
                    int.Parse(new Regex(@"physical id\s*:\s*(?<pid>\d*)").Match(match).Groups["pid"].Value)).Distinct();
            }
            catch
            {
                return;
            }

            foreach (var procIndex in procIndexes)
            {
                try
                {
                    var cpuInfo = string.Join("",
                        matches.Where(match =>
                            int.Parse(new Regex(@"physical id\s*:\s*(?<pid>\d*)").Match(match).Groups["pid"].Value) ==
                            procIndex).ToArray());
                    _CPUs.Add(new LinuxCPUInfo(cpuInfo));
                }
                catch
                {
                }
            }

            // -- CPU
        }

        private string CPU_Info => string.IsNullOrEmpty(_cpuInfo)
            ? (_cpuInfo = Utils.GetCommandExecutionOutput("cat", "/proc/cpuinfo"))
            : _cpuInfo;

        public override IList<CPUInfo> CPUs => _CPUs;

        public override IList<GPUInfo> GPUs =>
            _GPUs ?? (_GPUs = new List<GPUInfo> { new LinuxGPUInfo() }); // No idea how to detect multiple GPUs

        public override RAMInfo RAM => _RAM ?? (_RAM = new LinuxRAMInfo());
    }
}