// Copyright (C) Stichting Deltares 2018. All rights reserved.
//
// This file is part of the application DAM - Live.
//
// DAM - UI is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
// 
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
//
// All names, logos, and references to "Deltares" are registered trademarks of
// Stichting Deltares and remain full property of Stichting Deltares at all times.
// All rights reserved.

using System;
using System.IO;
using CommandLine;
using Deltares.Authorization;
using Deltares.Dam.Data;
using Deltares.Standard.Application;
using log4net.Config;

namespace Deltares.Dam.Application.Live
{
    internal class Program
    {
        internal readonly static LogHelper Logger = LogHelper.Create("DamLive");

        private static DAuthClient dAuthClient;
        private const string dAuthFeature = "DGS_27_00";
        private const string dAuthVersion = "17.0";
        
        static void Main(string[] args)
        {
            var damLicenseType = DamLicenseType.None;

            // new authorization client ?
            dAuthClient = new DAuthClient(false, true);
            if (dAuthClient.CheckOut(dAuthFeature, dAuthVersion))
            {
                damLicenseType = DamLicenseType.LFM;
            }
            
            XmlConfigurator.Configure();
            try
            {
                if (damLicenseType == DamLicenseType.None)
                {
                    throw new Exception("No license found for DamLive");
                }
                Run(args);
            }
            catch (Exception e)
            {
                Console.WriteLine();
                Logger.LogFatal("There was an unexpected error. Program terminated", e);
            }
            
            // check in license
            if (dAuthClient != null)
            {
                dAuthClient.CheckIn(dAuthFeature);
                dAuthClient.Dispose();
                dAuthClient = null;
            }
            
            //Console.ReadKey();
        }

        static void Run(string[] args)
        {
            var commandLineArguments = new CommandOptions();
            ICommandLineParser parser = new CommandLineParser();
            bool success = parser.ParseArguments(args, commandLineArguments);
            if (success)
            {
                var program = new Program();

                CreateOutputTimeSeriesFileIfNeeded(
                    commandLineArguments.TimeSeriesOutputFileName,
                    Path.GetDirectoryName(commandLineArguments.TimeSeriesOutputFileName));

                Logger.LogInfo("v18.1 - Deltares 2018");
                Logger.LogInfo("Model runner started");
                Console.WriteLine();
                program.StartCalculations(
                    commandLineArguments.DamXFileName,
                    commandLineArguments.TimeSeriesInputFileName,
                    commandLineArguments.TimeSeriesOutputFileName,
                    commandLineArguments.ParameterFileName,
                    commandLineArguments.Filter);
                Console.WriteLine();
                Logger.LogInfo("Model runner ended");
            }
            else
            {
                Console.WriteLine();
                Console.WriteLine(commandLineArguments.GetUsage());
            }
        }

        private static void CreateOutputTimeSeriesFileIfNeeded(string fileName, string path)
        {
            var filePath = Path.Combine(path, Path.GetFileName(fileName));
            if (!File.Exists(filePath))
            {                                
                using (var stream = File.CreateText(filePath))
                {

                    var xml =
                        "<?xml version=\"1.0\" encoding=\"UTF-8\" standalone=\"true\"?>" + Environment.NewLine +
                        "<TimeSeries xmlns=\"http://www.wldelft.nl/fews/PI\" xmlns:xsi=\"http://www.w3.org/2001/XMLSchema-instance\" version=\"1.2\">" +
                        Environment.NewLine +
                        "\t<timeZone>0</timeZone> " + Environment.NewLine +
                        "</TimeSeries>";

                    stream.Write(xml);

                }
            }
        }

        /// <summary>
        /// Starts the calculations.
        /// </summary>
        /// <param name="damXFile">The path of the .damx file</param>
        /// <param name="fewsInputFile">The FEWS input file.</param>
        /// <param name="fewsOutputFile">The FEWS output file.</param>
        /// <param name="calculationParametersFile">Settings of calculation parameters</param>
        /// <param name="filter">Filter to specify locations to handle</param>        
        internal void StartCalculations(string damXFile, string fewsInputFile, string fewsOutputFile, string calculationParametersFile="", string filter="")
        {
            if (string.IsNullOrWhiteSpace(damXFile)) throw new ArgumentException("damXFile");
            if (string.IsNullOrWhiteSpace(fewsInputFile)) throw new ArgumentException("fewsOutputFile");
            if (string.IsNullOrWhiteSpace(fewsOutputFile)) throw new ArgumentException("fewsExportFile");
            
            if (!File.Exists(damXFile)) throw new FileNotFoundException(damXFile);

            var workDir = Path.GetDirectoryName(damXFile) ?? ".\\";
            if (!File.Exists(fewsInputFile))
            {
                fewsInputFile = Path.Combine(workDir, fewsInputFile);
                if (!File.Exists(fewsInputFile)) throw new FileNotFoundException(fewsInputFile);
            }
            
            if (!File.Exists(fewsOutputFile))
            {
                fewsOutputFile = Path.Combine(workDir, fewsOutputFile);
                if (!File.Exists(fewsOutputFile)) throw new FileNotFoundException(fewsOutputFile);
            }
            
            if (!File.Exists(calculationParametersFile))
            {
                calculationParametersFile = Path.Combine(workDir, calculationParametersFile);
                if (!File.Exists(calculationParametersFile)) throw new FileNotFoundException(calculationParametersFile);
            }
            
            var damEngineRunner = new DamEngineRunner()
            {
                ParametersFile = new FileInfo(calculationParametersFile),
                FewsInputFile = new FileInfo(fewsInputFile),
                FewsOutputFile = new FileInfo(fewsOutputFile),
                DamXFile = new FileInfo(damXFile),
                Filter = filter,
            };

            damEngineRunner.Run();
        }
    }
}