using System;
using System.IO;
using Impexpdata.Core;
using log4net;

namespace Impexpdata
{
    class Program
    {
        private static readonly ILog Log = LogManager.GetLogger(System.Reflection.MethodBase.GetCurrentMethod().DeclaringType);
        private static readonly DataExchangeService DataExchangeService = new DataExchangeService();

        static void Main(string[] args)
        {
            log4net.Config.XmlConfigurator.Configure();

            if (args.Length == 0)
            {
                Log.Error("Application arguments not found.");
                MarkMessageAsError();
                Console.WriteLine("Application arguments not found.");
                Console.ResetColor();

                Console.WriteLine("Arguments: impexpdata -import <file name>.");
                Console.WriteLine("Arguments: impexpdata -export <file name>.");
                Console.WriteLine(@"<file name> can be absolute or relative. Like C:\impexpdata\export.cvs or just export.cvs.");
                Console.WriteLine("Example: impexpdata -import import.csv");
                Console.WriteLine("Press any key to exit...");
                Console.ReadKey();

                return;
            }
            if (args.Length < 2)
            {
                Log.Error("Application arguments count is invalid.");
                MarkMessageAsError();
                Console.WriteLine("Arguments count is invalid.");
                Console.ResetColor();

                Console.WriteLine("Press any key to exit...");
                Console.ReadKey();

                return;
            }

            var filePath = Path.IsPathRooted(args[1]) ? args[1] : Path.Combine(Properties.AppPath, args[1]);
            if (!Path.GetExtension(filePath).EndsWith("csv"))
            {
                Log.Error("Application works only with CSV files.");
                MarkMessageAsError();
                Console.WriteLine("Application works only with CSV files.");
                Console.ResetColor();

                Console.WriteLine("Press any key to exit...");
                Console.ReadKey();

                return;
            }

            var itemsProcessedCount = 0;
            var processResultMsg = string.Empty;
            switch (args[0])
            {
                case "-import":
                    Log.Info("Start import data...");
                    itemsProcessedCount = ImportData(filePath);
                    if (itemsProcessedCount == -1)
                    {
                        processResultMsg = "Import data file not found.";
                    }
                    else
                    {
                        processResultMsg = string.Format("Import process completed. {0} item(s) was processed.", itemsProcessedCount);
                        Log.Info("Import process completed.");
                    }
                    break;

                case "-export":
                    Log.Info("Start export data...");
                    itemsProcessedCount = ExportData(filePath);
                    processResultMsg = string.Format("Export process completed. {0} item(s) was processed.", itemsProcessedCount);
                    Log.Info("Export process completed.");
                    break;

                default:
                    processResultMsg = "Wrong process type argument value.";
                    Log.Error(processResultMsg);
                    break;
            }

            Console.WriteLine(processResultMsg);
            Console.WriteLine("Press any key to exit...");
            Console.ReadKey();
        }

        private static int ImportData(string filePath)
        {
            return DataExchangeService.ImportData(filePath);
        }

        private static int ExportData(string filePath)
        {
            return DataExchangeService.ExportData(filePath);
        }

        private static void MarkMessageAsError()
        {
            Console.ForegroundColor = ConsoleColor.Red;
        }
    }
}

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