// Copyright (C) Stichting Deltares 2017. All rights reserved.
//
// This file is part of Ringtoets.
//
// Ringtoets 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.Collections.Generic;
using System.Linq;
using Core.Common.Base;
using Ringtoets.Common.Data;
using Ringtoets.Common.Data.Exceptions;
using Ringtoets.Common.Data.Structures;
using Ringtoets.Common.Data.UpdateDataStrategies;
using Ringtoets.Common.IO.Exceptions;
using Ringtoets.Common.IO.Properties;
using Ringtoets.Common.IO.Structures;
using Ringtoets.Common.Service;
using Ringtoets.Common.Utils;
using Ringtoets.HeightStructures.Data;
using Ringtoets.HeightStructures.Service;

namespace Ringtoets.HeightStructures.Plugin.FileImporters
{
    /// <summary>
    /// An <see cref="UpdateDataStrategyBase{TTargetData,TFailureMechanism}"/> implementation for 
    /// updating height structures based on imported data.
    /// </summary>
    public class HeightStructureUpdateDataStrategy : UpdateDataStrategyBase<HeightStructure, HeightStructuresFailureMechanism>,
                                                     IStructureUpdateStrategy<HeightStructure>
    {
        /// <summary>
        /// Creates a new instance of <see cref="HeightStructureUpdateDataStrategy"/>.
        /// </summary>
        /// <param name="failureMechanism">The failure mechanism in which the structures are updated.</param>
        /// <exception cref="ArgumentNullException">Thrown when <paramref name="failureMechanism"/> is <c>null</c>.</exception>
        public HeightStructureUpdateDataStrategy(HeightStructuresFailureMechanism failureMechanism)
            : base(failureMechanism, new StructureIdEqualityComparer()) {}

        public IEnumerable<IObservable> UpdateStructuresWithImportedData(StructureCollection<HeightStructure> targetDataCollection,
                                                                         IEnumerable<HeightStructure> readStructures,
                                                                         string sourceFilePath)
        {
            try
            {
                return UpdateTargetCollectionData(targetDataCollection, readStructures, sourceFilePath);
            }
            catch (UpdateDataException e)
            {
                string message =
                    string.Format(Resources.IStructureUpdateStrategy_UpdateStructuresWithImportedData_Update_Structures_failed_Reason_0,
                                  e.Message);
                throw new StructureUpdateException(message, e);
            }
        }

        #region Removing Data Functions

        protected override IEnumerable<IObservable> RemoveObjectAndDependentData(HeightStructure removedObject)
        {
            return HeightStructuresDataSynchronizationService.RemoveStructure(FailureMechanism, removedObject);
        }

        #endregion

        /// <summary>
        /// Class for comparing <see cref="HeightStructure"/> by only the id.
        /// </summary>
        private class StructureIdEqualityComparer : IEqualityComparer<HeightStructure>
        {
            public bool Equals(HeightStructure x, HeightStructure y)
            {
                return x.Id.Equals(y.Id);
            }

            public int GetHashCode(HeightStructure obj)
            {
                return obj.Id.GetHashCode();
            }
        }

        #region Updating Data Functions

        protected override IEnumerable<IObservable> UpdateObjectAndDependentData(HeightStructure objectToUpdate,
                                                                                 HeightStructure objectToUpdateFrom)
        {
            var affectedObjects = new List<IObservable>();

            if (!objectToUpdate.Equals(objectToUpdateFrom))
            {
                objectToUpdate.CopyProperties(objectToUpdateFrom);

                affectedObjects.AddRange(UpdateHeightStructureDependentData(objectToUpdate));
            }

            return affectedObjects;
        }

        private IEnumerable<IObservable> UpdateHeightStructureDependentData(HeightStructure structure)
        {
            var affectedObjects = new List<IObservable>();

            foreach (StructuresCalculation<HeightStructuresInput> affectedCalculation in GetAffectedCalculationsWithHeightStructure(structure))
            {
                affectedObjects.Add(affectedCalculation.InputParameters);
                if (affectedCalculation.HasOutput)
                {
                    affectedObjects.Add(affectedCalculation);
                    affectedObjects.AddRange(RingtoetsCommonDataSynchronizationService.ClearCalculationOutput(affectedCalculation));
                }
            }

            affectedObjects.AddRange(StructuresHelper.UpdateCalculationToSectionResultAssignments(
                                         FailureMechanism.SectionResults,
                                         FailureMechanism.Calculations.Cast<StructuresCalculation<HeightStructuresInput>>()));

            return affectedObjects;
        }

        private IEnumerable<StructuresCalculation<HeightStructuresInput>> GetAffectedCalculationsWithHeightStructure(HeightStructure structure)
        {
            IEnumerable<StructuresCalculation<HeightStructuresInput>> affectedCalculations =
                FailureMechanism.Calculations
                                .Cast<StructuresCalculation<HeightStructuresInput>>()
                                .Where(calc => ReferenceEquals(calc.InputParameters.Structure, structure));
            return affectedCalculations;
        }

        #endregion
    }
}