using System;
using System.IO;
using System.Text;
using System.Diagnostics;
using System.Collections.Generic;

namespace AniNIX.Shared {

    public static class ExecuteCommand {

        // Allow anyone using this class to modify the timeout at will.
        public static int TimeOut = 5000;
        
        /// <summary>
        /// This method allows a CSharp app to execute a command on the OS.
        /// </summary>
        /// <param name=command>The command string to run as the string argument to "bash -c 'command'"</param>
        /// <param name=input>The effective replacement for the command's stdin</param
        /// <return>The stdout of the command</return>
        /// </summary>
        public static String Run(String command, String input) {
            //Sanitize inputs.

            command = command.Replace("\\'","'").Replace("'","\\'");

            //Create process.
            Process proc = new Process();
            proc.StartInfo.CreateNoWindow = true;
            proc.StartInfo.FileName = "/bin/bash";
            proc.StartInfo.Arguments = String.Format("-c \'{0}\'",command);
            proc.StartInfo.UseShellExecute=false;
            ReportMessage.Log(Verbosity.VeryVerbose,String.Format("{0} {1}",proc.StartInfo.FileName,proc.StartInfo.Arguments));
            
            //Redirect input
            proc.StartInfo.RedirectStandardOutput=true;
            proc.StartInfo.RedirectStandardInput=true;

            //Start process
            proc.Start();

            //Add input and read output.
            proc.StandardInput.Write(input);
            proc.StandardInput.Close();
            proc.WaitForExit(TimeOut);
            if (!proc.HasExited) {
                proc.Kill();
            }
            if (proc.ExitCode != 0) {
                throw new Exception(String.Format("Failed to exit command with return code {0}",proc.ExitCode));
            }
            String stdoutString = proc.StandardOutput.ReadToEnd();

            //Close up and return
            proc.Close();
            return stdoutString;
        }

        //Add polymorphism to allow no stdin
        public static String Run(String command) {
            return Run(command,null);
        }

    }
}