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//
// 此源代码遵循位于源代码树根目录中的 LICENSE 文件的许可证

namespace Admin.NET.Core;

public static class ComputerUtil
{
    /// <summary>
    /// 内存信息
    /// </summary>
    /// <returns></returns>
    public static MemoryMetrics GetComputerInfo()
    {
        MemoryMetricsClient client = new();
        MemoryMetrics memoryMetrics;
        if (IsMacOS())
        {
            memoryMetrics = client.GetMacOSMetrics();
        }
        else if (IsUnix())
        {
            memoryMetrics = client.GetUnixMetrics();
        }
        else
        {
            memoryMetrics = client.GetWindowsMetrics();
        }
        memoryMetrics.FreeRam = Math.Round(memoryMetrics.Free / 1024, 2) + "GB";
        memoryMetrics.UsedRam = Math.Round(memoryMetrics.Used / 1024, 2) + "GB";
        memoryMetrics.TotalRam = Math.Round(memoryMetrics.Total / 1024, 2) + "GB";
        memoryMetrics.RamRate = Math.Ceiling(100 * memoryMetrics.Used / memoryMetrics.Total).ToString() + "%";
        memoryMetrics.CpuRate = Math.Ceiling(GetCPURate().ParseToDouble()) + "%";
        return memoryMetrics;
    }

    /// <summary>
    /// 获取正确的操作系统版本（Linux获取发行版本）
    /// </summary>
    /// <returns></returns>
    public static String GetOSInfo()
    {
        string opeartion = string.Empty;
        if (IsMacOS())
        {
            var output = ShellHelper.Bash("sw_vers | awk 'NR<=2{printf \"%s \", $NF}'");
            if (output != null)
            {
                opeartion = output.Replace("%", string.Empty);
            }
        }
        else if (IsUnix())
        {
            var output = ShellHelper.Bash("awk -F= '/^VERSION_ID/ {print $2}' /etc/os-release | tr -d '\"'");
            opeartion = output ?? string.Empty;
        }
        else
        {
            opeartion = RuntimeInformation.OSDescription;
        }
        return opeartion;
    }

    /// <summary>
    /// 磁盘信息
    /// </summary>
    /// <returns></returns>
    public static List<DiskInfo> GetDiskInfos()
    {
        var diskInfos = new List<DiskInfo>();
        if (IsMacOS())
        {
            var output = ShellHelper.Bash(@"df -m | awk '/^\/dev\/disk/ {print $1,$2,$3,$4,$5}'");
            var disks = output.Split('\n', StringSplitOptions.RemoveEmptyEntries);
            if (disks.Length < 1) return diskInfos;
            foreach (var item in disks)
            {
                var disk = item.Split(' ', (char)StringSplitOptions.RemoveEmptyEntries);
                if (disk == null || disk.Length < 5)
                    continue;

                var diskInfo = new DiskInfo()
                {
                    DiskName = disk[0],
                    TypeName = ShellHelper.Bash("diskutil info " + disk[0] + " | awk '/File System Personality/ {print $4}'").Replace("\n", string.Empty),
                    TotalSize = long.Parse(disk[1]) / 1024,
                    Used = long.Parse(disk[2]) / 1024,
                    AvailableFreeSpace = long.Parse(disk[3]) / 1024,
                    AvailablePercent = decimal.Parse(disk[4].Replace("%", ""))
                };
                diskInfos.Add(diskInfo);
            }
        }
        else if (IsUnix())
        {
            var output = ShellHelper.Bash(@"df -mT | awk '/^\/dev\/(sd|vd|xvd|nvme|sda|vda)/ {print $1,$2,$3,$4,$5,$6}'");
            var disks = output.Split('\n', StringSplitOptions.RemoveEmptyEntries);
            if (disks.Length < 1) return diskInfos;

            //var rootDisk = disks[1].Split(' ', (char)StringSplitOptions.RemoveEmptyEntries);
            //if (rootDisk == null || rootDisk.Length < 1)
            //    return diskInfos;

            foreach (var item in disks)
            {
                var disk = item.Split(' ', (char)StringSplitOptions.RemoveEmptyEntries);
                if (disk == null || disk.Length < 6)
                    continue;

                var diskInfo = new DiskInfo()
                {
                    DiskName = disk[0],
                    TypeName = disk[1],
                    TotalSize = long.Parse(disk[2]) / 1024,
                    Used = long.Parse(disk[3]) / 1024,
                    AvailableFreeSpace = long.Parse(disk[4]) / 1024,
                    AvailablePercent = decimal.Parse(disk[5].Replace("%", ""))
                };
                diskInfos.Add(diskInfo);
            }
        }
        else
        {
            var driv = DriveInfo.GetDrives().Where(u => u.IsReady);
            foreach (var item in driv)
            {
                if (item.DriveType == DriveType.CDRom) continue;
                var obj = new DiskInfo()
                {
                    DiskName = item.Name,
                    TypeName = item.DriveType.ToString(),
                    TotalSize = item.TotalSize / 1024 / 1024 / 1024,
                    AvailableFreeSpace = item.AvailableFreeSpace / 1024 / 1024 / 1024,
                };
                obj.Used = obj.TotalSize - obj.AvailableFreeSpace;
                obj.AvailablePercent = decimal.Ceiling(obj.Used / (decimal)obj.TotalSize * 100);
                diskInfos.Add(obj);
            }
        }
        return diskInfos;
    }

    /// <summary>
    /// 获取外网IP地址
    /// </summary>
    /// <returns></returns>
    public static string GetIpFromOnline()
    {
        var url = "https://www.ip.cn/api/index?ip&type=0";
        var str = url.GetAsStringAsync().GetAwaiter().GetResult();
        var resp = JSON.Deserialize<IpCnResp>(str);
        return resp.Ip + " " + resp.Address;
    }

    public static bool IsUnix()
    {
        return RuntimeInformation.IsOSPlatform(OSPlatform.Linux);
    }

    public static bool IsMacOS()
    {
        return RuntimeInformation.IsOSPlatform(OSPlatform.OSX);
    }

    public static string GetCPURate()
    {
        string cpuRate;
        if (IsMacOS())
        {
            string output = ShellUtil.Bash("top -l 1 | grep \"CPU usage\" | awk '{print $3 + $5}'");
            cpuRate = output.Trim();
        }
        else if (IsUnix())
        {
            string output = ShellUtil.Bash("top -b -n1 | grep \"Cpu(s)\" | awk '{print $2 + $4}'");
            cpuRate = output.Trim();
        }
        else
        {
            string output = ShellUtil.Cmd("wmic", "cpu get LoadPercentage");
            cpuRate = output.Replace("LoadPercentage", string.Empty).Trim();
        }
        return cpuRate;
    }

    /// <summary>
    /// 获取系统运行时间
    /// </summary>
    /// <returns></returns>
    public static string GetRunTime()
    {
        string runTime = string.Empty;
        if (IsMacOS())
        {
            //macOS 获取系统启动时间：
            //sysctl -n kern.boottime | awk '{print $4}' | tr -d ','
            //返回：1705379131
            //使用date格式化即可
            string output = ShellUtil.Bash("date -r $(sysctl -n kern.boottime | awk '{print $4}' | tr -d ',') +\"%Y-%m-%d %H:%M:%S\"").Trim();
            runTime = DateTimeUtil.FormatTime((DateTime.Now - output.ParseToDateTime()).TotalMilliseconds.ToString().Split('.')[0].ParseToLong());
        }
        else if (IsUnix())
        {
            string output = ShellUtil.Bash("uptime -s").Trim();
            runTime = DateTimeUtil.FormatTime((DateTime.Now - output.ParseToDateTime()).TotalMilliseconds.ToString().Split('.')[0].ParseToLong());
        }
        else
        {
            string output = ShellUtil.Cmd("wmic", "OS get LastBootUpTime/Value");
            string[] outputArr = output.Split('=', (char)StringSplitOptions.RemoveEmptyEntries);
            if (outputArr.Length == 2)
                runTime = DateTimeUtil.FormatTime((DateTime.Now - outputArr[1].Split('.')[0].ParseToDateTime()).TotalMilliseconds.ToString().Split('.')[0].ParseToLong());
        }
        return runTime;
    }
}

/// <summary>
/// IP信息
/// </summary>
public class IpCnResp
{
    public string Ip { get; set; }

    public string Address { get; set; }
}

/// <summary>
/// 内存信息
/// </summary>
public class MemoryMetrics
{
    [Newtonsoft.Json.JsonIgnore]
    [System.Text.Json.Serialization.JsonIgnore]
    public double Total { get; set; }

    [Newtonsoft.Json.JsonIgnore]
    [System.Text.Json.Serialization.JsonIgnore]
    public double Used { get; set; }

    [Newtonsoft.Json.JsonIgnore]
    [System.Text.Json.Serialization.JsonIgnore]
    public double Free { get; set; }

    /// <summary>
    /// 已用内存
    /// </summary>
    public string UsedRam { get; set; }

    /// <summary>
    /// CPU使用率%
    /// </summary>
    public string CpuRate { get; set; }

    /// <summary>
    /// 总内存 GB
    /// </summary>
    public string TotalRam { get; set; }

    /// <summary>
    /// 内存使用率 %
    /// </summary>
    public string RamRate { get; set; }

    /// <summary>
    /// 空闲内存
    /// </summary>
    public string FreeRam { get; set; }
}

/// <summary>
/// 磁盘信息
/// </summary>
public class DiskInfo
{
    /// <summary>
    /// 磁盘名
    /// </summary>
    public string DiskName { get; set; }

    /// <summary>
    /// 类型名
    /// </summary>
    public string TypeName { get; set; }

    /// <summary>
    /// 总剩余
    /// </summary>
    public long TotalFree { get; set; }

    /// <summary>
    /// 总量
    /// </summary>
    public long TotalSize { get; set; }

    /// <summary>
    /// 已使用
    /// </summary>
    public long Used { get; set; }

    /// <summary>
    /// 可使用
    /// </summary>
    public long AvailableFreeSpace { get; set; }

    /// <summary>
    /// 使用百分比
    /// </summary>
    public decimal AvailablePercent { get; set; }
}

public class MemoryMetricsClient
{
    /// <summary>
    /// windows系统获取内存信息
    /// </summary>
    /// <returns></returns>
    public MemoryMetrics GetWindowsMetrics()
    {
        string output = ShellUtil.Cmd("wmic", "OS get FreePhysicalMemory,TotalVisibleMemorySize /Value");
        var metrics = new MemoryMetrics();
        var lines = output.Trim().Split('\n', (char)StringSplitOptions.RemoveEmptyEntries);
        if (lines.Length <= 0) return metrics;

        var freeMemoryParts = lines[0].Split('=', (char)StringSplitOptions.RemoveEmptyEntries);
        var totalMemoryParts = lines[1].Split('=', (char)StringSplitOptions.RemoveEmptyEntries);

        metrics.Total = Math.Round(double.Parse(totalMemoryParts[1]) / 1024, 0);
        metrics.Free = Math.Round(double.Parse(freeMemoryParts[1]) / 1024, 0);//m
        metrics.Used = metrics.Total - metrics.Free;

        return metrics;
    }

    /// <summary>
    /// Unix系统获取
    /// </summary>
    /// <returns></returns>
    public MemoryMetrics GetUnixMetrics()
    {
        string output = ShellUtil.Bash("free -m | awk '{print $2,$3,$4,$5,$6}'");
        var metrics = new MemoryMetrics();
        var lines = output.Split('\n', (char)StringSplitOptions.RemoveEmptyEntries);
        if (lines.Length <= 0) return metrics;

        if (lines != null && lines.Length > 0)
        {
            var memory = lines[1].Split(' ', (char)StringSplitOptions.RemoveEmptyEntries);
            if (memory.Length >= 3)
            {
                metrics.Total = double.Parse(memory[0]);
                metrics.Used = double.Parse(memory[1]);
                metrics.Free = double.Parse(memory[2]);//m
            }
        }
        return metrics;
    }

    /// <summary>
    /// macOS系统获取
    /// </summary>
    /// <returns></returns>
    public MemoryMetrics GetMacOSMetrics()
    {
        var metrics = new MemoryMetrics();
        //物理内存大小
        var total = ShellUtil.Bash("sysctl -n hw.memsize | awk '{printf \"%.2f\", $1/1024/1024}'");
        metrics.Total = float.Parse(total.Replace("%", string.Empty));
        //TODO:占用内存，检查效率
        var free = ShellUtil.Bash("top -l 1 -s 0 | awk '/PhysMem/ {print $6+$8}'");
        metrics.Free = float.Parse(free);
        metrics.Used = metrics.Total - metrics.Free;
        return metrics;
    }
}

public class ShellUtil
{
    /// <summary>
    /// linux 系统命令
    /// </summary>
    /// <param name="command"></param>
    /// <returns></returns>
    public static string Bash(string command)
    {
        var escapedArgs = command.Replace("\"", "\\\"");
        var process = new Process()
        {
            StartInfo = new ProcessStartInfo
            {
                FileName = "/bin/bash",
                Arguments = $"-c \"{escapedArgs}\"",
                RedirectStandardOutput = true,
                UseShellExecute = false,
                CreateNoWindow = true,
            }
        };
        process.Start();
        string result = process.StandardOutput.ReadToEnd();
        process.WaitForExit();
        process.Dispose();
        return result;
    }

    /// <summary>
    /// windows系统命令
    /// </summary>
    /// <param name="fileName"></param>
    /// <param name="args"></param>
    /// <returns></returns>
    public static string Cmd(string fileName, string args)
    {
        string output = string.Empty;

        var info = new ProcessStartInfo();
        info.FileName = fileName;
        info.Arguments = args;
        info.RedirectStandardOutput = true;

        using (var process = Process.Start(info))
        {
            output = process.StandardOutput.ReadToEnd();
        }
        return output;
    }
}

public class ShellHelper
{
    /// <summary>
    /// Linux 系统命令
    /// </summary>
    /// <param name="command"></param>
    /// <returns></returns>
    public static string Bash(string command)
    {
        var escapedArgs = command.Replace("\"", "\\\"");
        var process = new Process()
        {
            StartInfo = new ProcessStartInfo
            {
                FileName = "/bin/bash",
                Arguments = $"-c \"{escapedArgs}\"",
                RedirectStandardOutput = true,
                UseShellExecute = false,
                CreateNoWindow = true,
            }
        };
        process.Start();
        string result = process.StandardOutput.ReadToEnd();
        process.WaitForExit();
        process.Dispose();
        return result;
    }

    /// <summary>
    /// Windows 系统命令
    /// </summary>
    /// <param name="fileName"></param>
    /// <param name="args"></param>
    /// <returns></returns>
    public static string Cmd(string fileName, string args)
    {
        string output = string.Empty;

        var info = new ProcessStartInfo();
        info.FileName = fileName;
        info.Arguments = args;
        info.RedirectStandardOutput = true;

        using (var process = Process.Start(info))
        {
            output = process.StandardOutput.ReadToEnd();
        }
        return output;
    }
}