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


namespace MLMStripper
{
    class Program
    {

        static string INSERT_SQL = "INSERT [dbo].[CV3MLM] ([SiteID], [RepFlags], [Build], [TouchedBy], [TouchedWhen], [CreatedBy], [CreatedWhen], [Active], [GUID], [ID], [Name], [Description], [Status], [Logic], [MSrepl_tran_version], [UsageType], [Title], [ArdenVersion], [MLMVersion], [MLMDate], [MSReplrowguid]) VALUES (";

        // # Readin and Process all Lines
        static string curTitle;
        static List<string> ReadInLines = new List<string>();
        static bool LinesInBuffer { get { return ReadInLines.Count > 0; } }

        #region Simple Getters
        static string GetTitle(string line)
        {
            string s = line.Substring(INSERT_SQL.Length);
            string[] split = s.Split(',');

            string title = split[11].Trim().Substring(2); // removing starting 'N and last '
            return title.Substring(0, title.Length - 1);
        }

        static int GetStatus(string line)
        {
            string s = line.Substring(INSERT_SQL.Length);
            string[] split = s.Split(',');

            int status = int.Parse(split[13].Trim());
            return status;
        }

        static int GetActive(string line)
        {
            string s = line.Substring(INSERT_SQL.Length);
            string[] split = s.Split(',');

            int active = int.Parse(split[7].Trim());
            return active;
        }
        #endregion

        static int nPosFindIn(string startswithToLower, List<string> contents)
        {
            for (int i = contents.Count - 1; i >= 0; i--)
            {
                string s = contents[i].Trim();
                if (s.ToLower().StartsWith(startswithToLower.ToLower()))
                {
                    return i;
                }
            }
            return -1;
        }

        static void CleanupEndOfFile(List<string> contents)
        {
            bool bAddEnd = false;

            int nPos = nPosFindIn("end:", contents);
            if (nPos == -1)
            {
                nPos = nPosFindIn("urgency:", contents);
                bAddEnd = true;
            }

            if (nPos == -1)
            {
                for (int i = contents.Count - 1; i >= 0; i--)
                {
                    string s = contents[i].Trim();
                    if (string.IsNullOrEmpty(s))
                    {
                        contents.RemoveAt(i);
                    }
                    else
                    {
                        break;
                    }
                }
            }
            else
            {
                contents.RemoveRange(nPos + 1, (contents.Count - nPos - 1));
            }
                                
            if (bAddEnd)
                contents.Add("end:");
        }

        static void WriteOutFile()
        {

            // write out contents - remove last line and cleanup end            
            ReadInLines.RemoveAt(ReadInLines.Count - 1);

            CleanupEndOfFile(ReadInLines);

            // Now do the actual work
            string dirpath = IO.Directory.GetCurrentDirectory() + "\\" + curTitle.Split('_')[0];
            if (!IO.Directory.Exists(dirpath))
                 IO.Directory.CreateDirectory(dirpath);

            string FileNameNPath = dirpath + "\\" + curTitle + ".mlm";
            if(IO.File.Exists(FileNameNPath))
            {
                int i = 44;
            }
            using (IO.FileStream fs = new IO.FileStream(FileNameNPath, IO.FileMode.Create))
            using (IO.StreamWriter sw = new IO.StreamWriter(fs, Encoding.UTF8))
            {
                foreach (string line in ReadInLines)
                         sw.WriteLine(line);
                sw.Flush();
            }

            // done
            ReadInLines.Clear();
            curTitle = String.Empty;            
        }

        static void Main(string[] args)
        {
            if (args == null || string.IsNullOrEmpty(args[0]))
            {
                Console.WriteLine("Provide Filename");
                return;
            }

            string Filename = args[0];
            if (!IO.File.Exists(Filename))
            {
                Console.WriteLine("File does not exist");
                return;
            }

            // # Readin and Process all Lines
            using (IO.FileStream fs = new IO.FileStream(Filename, IO.FileMode.Open))
            using (IO.StreamReader reader = new IO.StreamReader(fs, Encoding.UTF8))
            {
                // Ignore the first two lines
                reader.ReadLine();
                reader.ReadLine();

                int filecount = 0;
                // # Iterate thru all the rest of the lines in the File
                for (string Line = reader.ReadLine(); Line != null; Line = reader.ReadLine())
                {

                    if (Line.StartsWith(INSERT_SQL))
                    {

                        if (LinesInBuffer)
                        {
                            WriteOutFile();
                        }

                        // we need active and status of 4
                        int active = GetActive(Line);
                        int status = GetStatus(Line);
                        //Trace.WriteLine(String.Format("Active:{0} - Status:{1} - FileCount:{2}", active, status, ++filecount));
                        if (active != 1 || status != 4)
                            continue;

                        // Begin Parsing this file
                        curTitle = GetTitle(Line);
                        //if (curTitle == "SCH_OUTPATIENT_STATUS_BOARD_COLUMN_UPDATE_2")
                        //{
                        //    int i = 44;
                        //}
                        Trace.WriteLine(String.Format("{0} - FileCount:{1}", curTitle, ++filecount));

                        // clear buffer
                        ReadInLines.Clear();
                        ReadInLines.Add("maintenance:\n"); // begining new file
                        continue;
                    }
                    else if (!String.IsNullOrEmpty(curTitle))
                    {
                        ReadInLines.Add(Line);
                    }

                }

                if (LinesInBuffer)
                {
                    WriteOutFile();
                }

            }

        }
    }
}