using DTS.Common.Import.ImportOptions;
using System;
using System.IO;
using System.Linq;

namespace DTS.Common.Import
{
    public class CSVFile
    {
        private readonly string _filename;
        public CSVFile(string filename)
        {
            _filename = filename;
        }
        public static bool IsInUse(string filename)
        {
            if (!string.IsNullOrEmpty(filename))
            {
                try
                {
                    _ = File.ReadAllLines(filename);
                    return false;
                }
                catch (IOException)
                {
                    return true;
                }
                catch (Exception)
                {
                    //We can supress this exception since we are interested in IOException only
                }
            }
            return true;
        }
        //FB 40598 check the format of csv and determine if is test setup or not
        public static bool IsCSVFileForTestSetupImport(string filename, CsvImportOptions csvImportOptions)
        {
            try
            {
                using (var csvReader = CsvUtil.CreateCsvReader(filename))
                {
                    var tokens = CsvUtil.ReadFields(csvReader);

                    if (tokens != null && tokens[0] == "Version")
                    {
                        return true;
                    }
                }
            }
            catch
            {
                // return false later
            }
            return false;
        }

        //FB 43815 Get the CSV file version 
        public static int GetCsvVersion(string filename)
        {
            try
            {
                using (var csvReader = CsvUtil.CreateCsvReader(filename))
                {
                    var tokens = CsvUtil.ReadFields(csvReader);

                    if (tokens != null && tokens[0] == "Version")
                    {
                        var tokens2 = CsvUtil.ReadFields(csvReader);
                        if (tokens2 != null)
                        {
                            var version = Convert.ToInt32(tokens2[0]);
                            return version;
                        }
                    }
                    return 0;
                }
            }
            catch
            {
                return 0;
            }
        }

        public int LineCount
        {
            get
            {
                var count = 0;
                if (!string.IsNullOrEmpty(_filename))
                {
                    string[] lines;
                    try
                    {
                        lines = File.ReadAllLines(_filename);
                        return lines.Count();
                    }

                    catch (Exception)
                    {
                        return count;
                    }
                }
                return count;
            }
        }
    }
}