// Copyright (C) Stichting Deltares 2018. All rights reserved.
//
// This file is part of the Dam Engine.
//
// The Dam Engine is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero 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 Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero 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.Collections.Generic;
using System.Diagnostics;
using System.Linq;
using System.Text.RegularExpressions;
using Deltares.DamEngine.Data.General;
using Deltares.DamEngine.Data.Geotechnics;
using Deltares.DamEngine.Data.RegionalAssessmentResults;
using Deltares.DamEngine.Data.Standard.Calculation;
using Deltares.DamEngine.Data.Standard.Language;
using Deltares.DamEngine.Data.Standard.Logging;

namespace Deltares.DamEngine.Calculators.DikesAssessmentRegional
{
    /// <summary>
    /// Exception for RegionalScenariosCalculation class
    /// </summary>
    public class RegionalScenariosCalculationException : ApplicationException
    {
        public RegionalScenariosCalculationException() { }
        public RegionalScenariosCalculationException(string message) : base(message) { }
    }

    public class RegionalScenariosCalculation : ICalculation
    {
        private EvaluationJob evaluationJob = null;
        private GetValuesDelegate getValuesDelegate = null;
        private ProgressDelegate progressDelegate = null;
        private SendMessageDelegate sendMessageDelegate = null;
        private string mstabExePath = @".\DGeoStability.exe";
        private int maxCalculationCores = 255;

        private Dictionary<ICalculation, RegionalResult> runningJobs = new Dictionary<ICalculation, RegionalResult>();
        private bool isSkipStabilityCalculation = false;
        
        public PipingModelType PipingModelType { get; set; }
        public MStabParameters MStabParameters { get; set; }

        public RegionalScenariosCalculation()
        {
        }

        #region ICalculation Members

        public CalculationResult GetResults(ref string results)
        {
            //            try
            //            {
            //                XmlSerializer serializer = new XmlSerializer();
            //                results = serializer.SerializeToString(this.evaluationJob);
            //                return CalculationResult.Succeeded;
            //            }
            //            catch
            //            {
            //                return CalculationResult.UnexpectedError;
            //            }##Bka
            return CalculationResult.UnexpectedError;
        }

        public CalculationResult Load(string input)
        {
            //            try
            //            {
            //                XmlDeserializer deserializer = new XmlDeserializer();
            //                this.evaluationJob = (EvaluationJob)deserializer.XmlDeserializeFromString(input, typeof(EvaluationJob), new DefaultClassFactory());
            //                return CalculationResult.Succeeded;
            //            }
            //            catch
            //            {
            //                return CalculationResult.UnexpectedError;
            //            }##Bka
            return CalculationResult.UnexpectedError;
        }

        public CalculationResult RegisterGetValues(GetValuesDelegate getValuesDelegate)
        {
            this.getValuesDelegate = getValuesDelegate;
            return CalculationResult.Succeeded;
        }

        public CalculationResult RegisterProgress(ProgressDelegate progressDelegate)
        {
            this.progressDelegate = progressDelegate;
            return CalculationResult.Succeeded;
        }

        public CalculationResult RegisterSendDebugInfo(SendDebugInfodelegate sendDebugInfoDelegate)
        {
            return CalculationResult.Succeeded;
        }

        public CalculationResult RegisterSendMessage(SendMessageDelegate sendMessageDelegate)
        {
            this.sendMessageDelegate = sendMessageDelegate;
            return CalculationResult.Succeeded;
        }

        public CalculationResult RegisterSetValues(SetValuesDelegate setValuesDelegate)
        {
            return CalculationResult.Succeeded;
        }

        public CalculationResult RegisterUserAbort(UserAbortDelegate userAbortDelegate)
        {
            return CalculationResult.Succeeded;
        }

        public CalculationResult Run()
        {
            try
            {

                List<RegionalScenarioProfileResult> tasks = this.FillQueue();

                General.Parallel.Run(tasks, this.RunTask, this.progressDelegate, this.MaxCalculationCores);
                this.FillResults(tasks);

                return CalculationResult.Succeeded;
            }
            catch(Exception exception)
            {
                sendMessageDelegate(new LogMessage(LogMessageType.Warning, null, "Unexpected error:" + exception.Message));
                throw exception;
            }
        }

        public CalculationResult Validate()
        {
            return CalculationResult.Succeeded;
        }

        #endregion

        public string Version
        {
            get { return System.Reflection.Assembly.GetExecutingAssembly().GetName().Version.ToString(); }
        }

        public string MStabExePath
        {
            get { return mstabExePath; }
            set { mstabExePath = value; }
        }

        public bool IsSkipStabilityCalculation
        {
            get { return isSkipStabilityCalculation; }
            set { isSkipStabilityCalculation = value; }
        }

        public int MaxCalculationCores
        {
            get { return maxCalculationCores; }
            set { maxCalculationCores = value; }
        }

        private List<RegionalScenarioProfileResult> FillQueue()
        {
            List<RegionalScenarioProfileResult> tasks = new List<RegionalScenarioProfileResult>();

            this.evaluationJob.FailedEvaluatedLocations = new List<Location>();
            foreach (Location location in this.evaluationJob.Locations)
            {
                if (location.Segment == null)
                {
                    // Add this location to the failed locations 
                    if (this.evaluationJob.FailedEvaluatedLocations.IndexOf(location) < 0)
                    {
                        this.evaluationJob.FailedEvaluatedLocations.Add(location);
                        var locationHasNoSegment = LocalizationManager.GetTranslatedText(this.GetType(), "LocationHasNoSegment");
                        sendMessageDelegate(new LogMessage(LogMessageType.Error, location, locationHasNoSegment));
                    }
                }
                else
                {
                    // TODO: Ask Erik Vastenburg how to handle piping and stability soilprofiles when determining RWScenarios
                    // For now we only use the stability profiles.
                    var soilGeometryProbabilities =
                        location.Segment.SoilProfileProbabilities.Where(s => (s.SegmentFailureMechanismType == null) ||
                                                                             (s.SegmentFailureMechanismType.Value ==
                                                                              FailureMechanismSystemType.StabilityInside)).ToList();
                    if (soilGeometryProbabilities.Count == 0)
                    {
                        this.evaluationJob.FailedEvaluatedLocations.Add(location);
                        sendMessageDelegate(
                            new LogMessage(LogMessageType.Warning, location, String.Format("Location has no soilprofiles: ") +
                                String.Format("Segment: {0}", location.Segment.Name)));

                    }
                    else
                    {
                        foreach (SoilGeometryProbability soilGeometryProbability in soilGeometryProbabilities)
                        {
                            if (soilGeometryProbability.SoilProfileType == SoilProfileType.ProfileType2D || soilGeometryProbability.SoilProfileType == SoilProfileType.ProfileTypeStiFile)
                            {
                                this.evaluationJob.FailedEvaluatedLocations.Add(location);
                                sendMessageDelegate(new LogMessage(LogMessageType.Warning, location, LocalizationManager.GetTranslatedText(this, "Geometry2DNotSupportedInRegionalAssessment") +
                                                    String.Format("Segment: {0}", location.Segment.Name)));
                            }
                            else
                            {

                                SoilProfile soilProfile = soilGeometryProbability.SoilProfile1D;
                                IList<RegionalScenarioProfileResult> rwScenarios = null;
                                try
                                {
                                    rwScenarios = this.GetRWScenarios(location, soilGeometryProbability);
                                }
                                catch (Exception e)
                                {
                                    rwScenarios = null;
                                    // Add this location to the failed locations 
                                    if (this.evaluationJob.FailedEvaluatedLocations.IndexOf(location) < 0)
                                    {
                                        this.evaluationJob.FailedEvaluatedLocations.Add(location);
                                        sendMessageDelegate(
                                            new LogMessage(LogMessageType.Warning, location, String.Format("Cannot generate scenarios: {0}", e.Message) +
                                                           String.Format("Soilprofile: {0}", soilProfile.Name)));
                                    }
                                }
                                if (rwScenarios != null)
                                {
                                    foreach (RegionalScenarioProfileResult job in rwScenarios)
                                    {
                                        tasks.Add(job);
                                    }
                                }
                            }
                        }
                    }
                }
            }

            return tasks;
        }

        private IList<RegionalScenarioProfileResult> GetRWScenarios(Location location, SoilGeometryProbability soilGeometryProbability)
        {
            RegionalScenarioSelector selector = new RegionalScenarioSelector();
            selector.PipingModelType = PipingModelType;
            selector.MStabParameters = MStabParameters;
            return selector.GetScenarios(location, soilGeometryProbability);
        }

        private void RunTask(object task)
        {
            var job = (RegionalScenarioProfileResult)task;

            try
            {
                if (!IsSkipStabilityCalculation)
                {
                    ProcessJob(job);
                }
                else
                {
                    job.CalculationResult = CalculationResult.NoRun;
                }
            }
            catch (Exception e)
            {
                job.CalculationResult = CalculationResult.UnexpectedError;
                sendMessageDelegate(new LogMessage(LogMessageType.Warning, job, String.Format(job.LocationName + " Error: {0}", e.Message)));
            }
        }

        /// <summary>
        /// Select which job processor to use, depending on failuremechanism
        /// </summary>
        /// <param name="job"></param>
        private void ProcessJob(RegionalScenarioProfileResult job)
        {
            Debug.WriteLine(String.Format("Job {0}, location {1}, Scenario {2}", job.FailureMechanismType.ToString(), job.LocationName, job.ScenarioType.ToString()));
            switch (job.FailureMechanismType)
            {
                case FailureMechanismSystemType.StabilityInside:
                    ProcessJobStability(job);
                    break;
                case FailureMechanismSystemType.Piping:
                    ProcessJobPiping(job);
                    break;
                default:
                    throw new RegionalScenariosCalculationException(String.Format("Failuremechanism {0} not yet implemented for scenario calculation", job.FailureMechanismType));
            }            
        }

        /// <summary>
        /// Process a job for failuremechanism Piping
        /// </summary>
        /// <param name="job"></param>
        private void ProcessJobPiping(RegionalScenarioProfileResult job)
        {
//            if (job.Location.ModelFactors.UpliftCriterionPiping.HasValue)
//            {
//                var modelParametersForPLLines = new ModelParametersForPlLines();
//                var calculator = GetCalculatorForPipingModel(job, modelParametersForPLLines);
//                double waterLevel;
//                switch (job.LoadSituation)
//                {
//                    case LoadSituation.Dry:
//                        waterLevel = job.Location.BoezemLevelLbp;
//                        break;
//                    default: // LoadSituation.Wet
//                        waterLevel = job.Location.BoezemLevelTp;
//                        break;
//                }
//                //job.SoilGeometryProbability.SoilProfile1D.EnsureUniqueLayerIds();
//                var calculationName = GetCalculationNameForPipingCalculator(job);
//                calculator.FilenameCalculation = Path.Combine(Path.Combine(DamProjectData.ProjectWorkingPath, job.FailureMechanismType.ToString()), calculationName);
//                calculator.IsHydraulicShortcut = (job.HydraulicShortcutType == HydraulicShortcutType.HydraulicShortcut);
//                double? pipingFactor = calculator.CalculatePipingFactor(job.Location, job.Location.LocalXZSurfaceLine2, job.SoilGeometryProbability.SoilProfile1D, waterLevel);
//                job.BaseFileName = calculator.FilenameCalculation;
//
//                job.RegionalResultType = RegionalResultType.SafetyFactor;
//                if (pipingFactor.HasValue)
//                {
//                    job.SafetyFactor = pipingFactor.Value;
//                    job.CalculationResult = CalculationResult.Succeeded;
//                    job.ProbabilityOfFailure = double.NaN;
//                    job.RegionalResultType = RegionalResultType.SafetyFactor;
//                }
//
//                else
//                {
//                    job.SafetyFactor = double.NaN;
//                    job.CalculationResult = CalculationResult.RunFailed;
//                }
//            }
//            else
//            {
//                throw new RegionalScenariosCalculationException(String.Format("Uplift criterion not defined for location {0}", job.Location.Name));
//            } //##Bka

        }

        private string GetCalculationNameForPipingCalculator(RegionalScenarioProfileResult job)
        {
            string calculationName;
            switch (job.PipingModelOption)
            {
                case PipingModelType.SellmeijerVnk : calculationName = String.Format("Calc(SellmeijerVnk)_Loc({0})_Pro({1}))",
                                                                                  job.LocationName, job.SoilProfileName);
                    break;
                case PipingModelType.Sellmeijer4Forces: calculationName = String.Format("Calc(Sellmeijer4Forces)_Loc({0})_Pro({1}))",
                                                                                        job.LocationName, job.SoilProfileName);
                    break;
                // Set Sellmeijer4Forces as default.
                default: calculationName = String.Format("Calc(Sellmeijer4Forces)_Loc({0})_Pro({1}))",
                                                         job.LocationName, job.SoilProfileName);
                    break;
            }
            calculationName = Regex.Replace(calculationName, @"[\\\/:\*\?""'<>|.]", "_");
            return calculationName;
        }

        /// <summary>
        /// Determines the proper calculator for pipng
        /// </summary>
        /// <param name="job"></param>
        /// <param name="modelParametersForPLLines"></param>
        /// <returns>proper piping calculator</returns>
//        private PipingCalculator GetCalculatorForPipingModel(RWScenarioProfileResult job, ModelParametersForPlLines modelParametersForPLLines)
//        {
//            PipingCalculator calculator;
//            switch (job.PipingModelOption)
//            {
//                case PipingModelType.SellmeijerVnk: calculator = new PipingCalculatorSellmeijer(modelParametersForPLLines,
//                                                                                             1.0, null, null, null, job.Location.ModelFactors.UpliftCriterionPiping.Value);
//                    break;
//                case PipingModelType.Sellmeijer2Forces: calculator = new PipingCalculatorSellmeijer2Forces(modelParametersForPLLines,
//                                                                                                           1.0, null, null, job.Location.ModelFactors.UpliftCriterionPiping.Value);
//                    break;
//                case PipingModelType.Sellmeijer4Forces: calculator = new PipingCalculatorSellmeijer4Forces(modelParametersForPLLines,
//                                                                                                           1.0, null, null, job.Location.ModelFactors.UpliftCriterionPiping.Value);
//                    break;
//                case PipingModelType.Bligh: calculator = new PipingCalculatorBligh(modelParametersForPLLines,
//                                                                                   1.0, null, null, job.Location.ModelFactors.UpliftCriterionPiping.Value);
//                    break;
//                default:
//                    throw new RegionalScenariosCalculationException(String.Format("Piping model {0} not yet implemented for scenario calculation", job.PipingModelOption));
//            }
//            return calculator;
//        }
        
        /// <summary>
        /// Process a job for failuremechanism Stability
        /// </summary>
        /// <param name="job"></param>
        private void ProcessJobStability(RegionalScenarioProfileResult job)
        {
//            StabilityCalculation calculator = new StabilityCalculation();

//            lock (runningJobs)
//            {
//                runningJobs[calculator] = job;
//            }

           // calculator.MStabExePath = this.MStabExePath;
//            calculator.RegisterSendMessage(this.SendStabilityMessage);
//
//            string soilDatabaseName = job.Location.StabilityOptions.SoilDatabaseName;
            //            DamFailureMechanismeCalculationSpecification damCalculation =
            //                calculator.GetSpecification(this.evaluationJob.DikeName, soilDatabaseName, job.Location, new SoilGeometry(job.SoilGeometryProbability.SoilProfile1D, null),
            //                (MStabModelType)job.MstabModelOption, job.LoadSituation, job.DikeDrySensitivity, job.HydraulicShortcutType, MStabParameters);
            //
            //            calculator.SaveToFile(damCalculation.FailureMechanismParametersMStab);
            //            string inputFile = damCalculation.FailureMechanismParametersMStab.MStabParameters.ProjectFileName;
            //
            //            job.BaseFileName = inputFile.Replace(DamProject.ProjectWorkingPath, @"").Replace(".sti", "");

//            calculator.Load(inputFile);
//            job.CalculationResult = calculator.Run();

            if (job.CalculationResult == CalculationResult.Succeeded)
            {
                string results = "";

//                job.CalculationResult = calculator.GetResults(ref results);
                //XmlDeserializer deserializer = new XmlDeserializer();
//                RegionalResult result = (RegionalResult)deserializer.XmlDeserializeFromString(results, typeof(RegionalResult));

//                job.SafetyFactor = result.SafetyFactor;
//                job.ProbabilityOfFailure = result.ProbabilityOfFailure;
//                job.RegionalResultType = result.RegionalResultType;
//                job.CalculationResult = result.CalculationResult;
            }
            else
            {
//                job.RegionalResultType = (damCalculation.FailureMechanismParametersMStab.MStabParameters.IsProbabilistic ? RegionalResultType.ProbabilityOfFailure : RegionalResultType.SafetyFactor);
                job.SafetyFactor = double.NaN;
                job.ProbabilityOfFailure = double.NaN;
            }

            lock (runningJobs)
            {
//                runningJobs.Remove(calculator);
            }
        }

        /// <summary>
        /// Log messages
        /// </summary>
        /// <param name="logMessage"></param>
        private void SendStabilityMessage(LogMessage logMessage)
        {
            lock (runningJobs)
            {
                if (logMessage.Subject != null)
                {
                    var job = (RegionalScenarioProfileResult)runningJobs[(ICalculation)logMessage.Subject];
                    logMessage.Subject = job.Location;                 
                }
            }

            this.sendMessageDelegate(logMessage);
        }

        /// <summary>
        /// Fill the results for the scenarios
        /// </summary>
        private void FillResults(List<RegionalScenarioProfileResult> tasks)
        {
            // Fill scenariosResult structure with jobs just run 

            foreach (Location location in this.evaluationJob.Locations)
            {
                try
                {
                    RegionalScenariosResult scenariosResult = new RegionalScenariosResult();

                    if (this.evaluationJob.FailedEvaluatedLocations.IndexOf(location) < 0)
                    {
                        // scenarios were succesfully created, so results are available
                        foreach (RegionalScenarioProfileResult job in tasks)
                        {
                            if (job.LocationName.Equals(location.Name))
                            {
                                RegionalScenarioResult scenarioResult = null;
                                foreach (var existingScenarioResult in scenariosResult.RegionalScenarioResults)
                                {
                                    if (existingScenarioResult.ScenarioType == job.ScenarioType)
                                    {
                                        scenarioResult = existingScenarioResult;
                                    }
                                }

                                if (scenarioResult == null)
                                {
                                    scenarioResult = new RegionalScenarioResult();
                                    scenarioResult.ScenarioType = job.ScenarioType;

                                    scenariosResult.RegionalScenarioResults.Add(scenarioResult);
                                }

                                scenarioResult.RegionalScenarioProfileResults.Add(job);
                            }
                        }

                        // Combine results

                        foreach (var scenarioResult in scenariosResult.RegionalScenarioResults)
                        {
                            this.CombineProfiles(scenarioResult);
                        }
                        this.CombineScenarios(scenariosResult);

                    }
                    else
                    {
                        // scenarios were not succesfully created, so results are not available
                        // no succesful calculations found
                        scenariosResult.CalculationResult = CalculationResult.RunFailed;
                        scenariosResult.SafetyFactor = double.NaN;
                    }

                    // scenariosResult are the results of all scenarios for one location.
                    this.evaluationJob.Results.Add(scenariosResult);

                }
                catch (Exception e)
                {
                    RegionalScenariosResult scenariosResult = new RegionalScenariosResult
                                                            {
                                                                CalculationResult = CalculationResult.RunFailed,
                                                                SafetyFactor = double.NaN
                                                            };
                    sendMessageDelegate(new LogMessage(LogMessageType.Warning, location, String.Format("Error in location {0}: {1}", location.Name, e.Message)));
                }
            }

        }

        private void CombineProfiles(RegionalScenarioResult scenarioResult)
        {
            // combine results of profiles

            scenarioResult.SafetyFactor = Double.MaxValue;
            foreach (var profileResult in scenarioResult.RegionalScenarioProfileResults)
            {
                if (profileResult.CalculationResult == CalculationResult.Succeeded)
                {
                    if (profileResult.SafetyFactor < scenarioResult.SafetyFactor)
                    {
                        scenarioResult.SafetyFactor = profileResult.SafetyFactor;
                    }

                    scenarioResult.CalculationResult = CalculationResult.Succeeded;
                }
            }
            if (scenarioResult.CalculationResult != CalculationResult.Succeeded)
            {
                // no succesful calculations found
                scenarioResult.CalculationResult = scenarioResult.RegionalScenarioProfileResults[0].CalculationResult;
                scenarioResult.SafetyFactor = scenarioResult.RegionalScenarioProfileResults[0].SafetyFactor;
            }
        }

        private void CombineScenarios(RegionalScenariosResult scenariosResult)
        {
            // combine results of scenarios
            scenariosResult.SafetyFactor = Double.MaxValue;
            foreach (var scenarioResult in scenariosResult.RegionalScenarioResults)
            {
                if (scenarioResult.CalculationResult == CalculationResult.Succeeded)
                {
                    if (scenarioResult.SafetyFactor < scenariosResult.SafetyFactor)
                    {
                        scenariosResult.SafetyFactor = scenarioResult.SafetyFactor;
                    }
                    scenariosResult.CalculationResult = CalculationResult.Succeeded;
                }
            }
        }
    }
}