//
// ShellCommand.cs
//
// Author:
//       Carsten Sonne Larsen <cs@innolan.dk>
//
// Copyright (c) 2016 Carsten Sonne Larsen
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
using System;
using System.Diagnostics;
using System.IO;
using Ntp.Analyzer.Log;

namespace Ntp.System
{
    public sealed class ShellCommand
    {
        public ShellCommand (string command, string arguments, LogBase log)
        {
            this.command = command;
            this.arguments = arguments;
            this.log = log;
            ErrorMessage = String.Empty;
        }

        public static string WorkingDirectory {
            get;
            set;
        }

        public string ErrorMessage {
            get;
            set;
        }

        private readonly string command;

        private readonly string arguments;

        private readonly LogBase log;

        public StreamReader Execute()
        {
            Process proc = new Process ();
            proc.EnableRaisingEvents = false;
            proc.StartInfo.UseShellExecute = false;
            proc.StartInfo.RedirectStandardOutput = true;
            proc.StartInfo.RedirectStandardError = true;
            proc.StartInfo.WorkingDirectory = WorkingDirectory;
            proc.StartInfo.FileName = command;
            proc.StartInfo.Arguments = " " + arguments;

            log.WriteLine ("Executing: " + command + " " + arguments, Severity.Debug);
            proc.Start ();

            string error = proc.StandardError.ReadToEnd ();
            proc.WaitForExit ();

            if (error != String.Empty) {
                log.WriteLine (ErrorMessage + ": " + error, Severity.Error);
                return null;
            }

            return proc.StandardOutput;
        }
    }
}
