using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using Tango.Core.IO;

namespace Tango.SQLExaminer
{
    public class ExaminerProcess
    {
        public String ConfigurationFile { get; private set; }

        public ExaminerProcessType ProcessType { get; set; }

        public event EventHandler<String> Progress;

        public ExaminerProcess(String configurationFile, ExaminerProcessType type)
        {
            ConfigurationFile = configurationFile;
            ProcessType = type;
        }

        public ExaminerProcess(ExaminerConfiguration configuration, ExaminerProcessType type)
        {
            ConfigurationFile = TemporaryManager.Default.CreateFile();
            configuration.ToFile(ConfigurationFile);
            ProcessType = type;
        }

        public Task<ExaminerProcessResult> Execute()
        {
            return Task.Factory.StartNew<ExaminerProcessResult>(() =>
            {
                Process p = new Process();
                p.StartInfo.WindowStyle = ProcessWindowStyle.Hidden;
                p.StartInfo.CreateNoWindow = true;

                if (ProcessType == ExaminerProcessType.Schema)
                {
                    p.StartInfo.FileName = Helper.SQL_EXAMINER_FOLDER + "\\SQLECmd.exe";
                }
                else
                {
                    p.StartInfo.FileName = Helper.SQL_EXAMINER_FOLDER + "\\SQLDECmd.exe";
                }

                var sb = new StringBuilder();

                p.StartInfo.RedirectStandardOutput = true;
                p.StartInfo.RedirectStandardError = true;

                p.OutputDataReceived += (sender, args) =>
                {
                    sb.AppendLine(args.Data);
                    Progress?.Invoke(this, args.Data);
                };
                p.ErrorDataReceived += (sender, args) =>
                {
                    sb.AppendLine(args.Data);
                    Progress?.Invoke(this, args.Data);
                };

                p.StartInfo.UseShellExecute = false;

                p.StartInfo.Arguments = String.Format("/CONFIG:\"{0}\"", ConfigurationFile);

                p.Start();

                p.BeginOutputReadLine();
                p.BeginErrorReadLine();

                p.WaitForExit();

                return new ExaminerProcessResult()
                {
                    ExitCode = (ExaminerProcessExitCode)p.ExitCode,
                    Output = sb.ToString()
                };
            });
        }
    }
}