using Microsoft.Extensions.Logging;
using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace CAUtilLib
{
    public class ExecShellCmdResult
    {
        public string StdOutPut { get; set; } = string.Empty;
        public string StdErrOutPut { get; set; } = string.Empty;
        public int? ExitCode { get; set; } = null;
        public bool IsSuccess => ExitCode == 0;

        public static implicit operator bool(ExecShellCmdResult result) => result.IsSuccess;
    }

    public partial class CaUtil_openssl
    {
        public async Task<bool> MergeFile(string outFile, string inFile1, string inFile2)
        {
            outFile = Path.Combine(path, outFile);
            inFile1 = Path.Combine(path, inFile1);
            inFile2 = Path.Combine(path, inFile2);
            try
            {
                if (!File.Exists(inFile1) ||
                    !File.Exists(inFile2))
                {
                    return false;
                }

                var oStream = File.OpenWrite(outFile);
                await File.OpenRead(inFile1).CopyToAsync(oStream);
                await File.OpenRead(inFile2).CopyToAsync(oStream);
                oStream.Close();
                return true;
            }
            catch (Exception e)
            {
                logger.LogCritical(e.Message);
            }
            return false;
        }

        private async Task<string> GetOpenSSLRandSn()
        {
            var result = await ExecShellCmd("openssl", "rand -hex 8");
            return result ? result.StdOutPut.Trim() : "" ;
        }

        public async Task<ExecShellCmdResult> ExecShellCmd(string fileName, string arguments)
        {
            var toReturn = new ExecShellCmdResult();

            Process process = new Process();
            process.EnableRaisingEvents = true;
            //process.OutputDataReceived += Process_OutputDataReceived;
            //process.ErrorDataReceived += Process_ErrorDataReceived;
            // set the process start info
            process.StartInfo.FileName = fileName; // specify the command to run
            process.StartInfo.Arguments = arguments; // specify the arguments

            // set additional process start info as necessary
            process.StartInfo.WorkingDirectory = this.path;
            process.StartInfo.UseShellExecute = false;
            process.StartInfo.RedirectStandardInput = true;
            process.StartInfo.RedirectStandardOutput = true;
            process.StartInfo.RedirectStandardError = true;

            // start the process
            var startResult = process.Start();

            // wait for the process to exit
            await process.WaitForExitAsync();
            //process.BeginOutputReadLine();
            //process.BeginErrorReadLine();

            toReturn.StdOutPut = await process.StandardOutput.ReadToEndAsync();
            toReturn.StdErrOutPut = await process.StandardError.ReadToEndAsync();
            toReturn.ExitCode = process.ExitCode;

            Console.WriteLine(toReturn.StdOutPut);
            Console.WriteLine(toReturn.StdErrOutPut);

            return toReturn;
            //return process.ExitCode == 0;

            //void Process_OutputDataReceived(object sender, DataReceivedEventArgs e)
            //{
            //    toReturn.StdOutPut += e.Data;
            //    logger.LogTrace(e.Data);
            //    Console.WriteLine(e.Data);
            //}

            //void Process_ErrorDataReceived(object sender, DataReceivedEventArgs e)
            //{
            //    toReturn.StdErrOutPut += e.Data;
            //    logger.LogTrace(e.Data);
            //    Console.WriteLine(e.Data);
            //}
        }
    }
}