// 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 Deltares.DamEngine.Calculators.DikesAssessmentRegional;
using Deltares.DamEngine.Calculators.DikesDesign;
using Deltares.DamEngine.Data.General;
using Deltares.DamEngine.Data.Standard;
using Deltares.DamEngine.Data.Standard.Calculation;
using Deltares.DamEngine.Data.Standard.Logging;
using Deltares.DamEngine.Interface.Properties;
using Deltares.DamEngine.Io;
using Deltares.DamEngine.Io.XmlInput;
using Deltares.DamEngine.Io.XmlOutput;

namespace Deltares.DamEngine.Interface
{
    /// <summary>
    /// The main interface class for accessing the Dam Engine
    /// </summary>
    public class EngineInterface
    {
        private ProgressDelegate progressDelegate;
        private SendMessageDelegate sendMessageDelegate;
        private UserAbortDelegate userAbortDelegate;
        
        /// <summary>
        /// Initializes a new instance of the <see cref="EngineInterface"/> class.
        /// </summary>
        /// <param name="modelInput">Xml string containing the model input.</param>
        public EngineInterface(string modelInput)
        {
            if (String.IsNullOrEmpty(modelInput))
            {
                throw new EngineInterfaceException(Resources.Error_EmptyInputString);
            }

            Input input = DamXmlSerialization.LoadInputFromXmlString(modelInput);
            DamProjectData = FillDamFromXmlInput.CreateDamProjectData(input);
            SendMessage(new LogMessage() { MessageType = LogMessageType.Info, Message = Resources.ModelAccepted });
        }

        /// <summary>
        /// Gets or sets the progress delegate.
        /// </summary>
        /// <value>
        /// The progress delegate.
        /// </value>
        public ProgressDelegate ProgressDelegate
        {
            get
            {
                return progressDelegate;
            }
            set
            {
                progressDelegate = value;
            }
        }

        /// <summary>
        /// Gets or sets the send message delegate.
        /// </summary>
        /// <value>
        /// The send message delegate.
        /// </value>
        public SendMessageDelegate SendMessageDelegate
        {
            get
            {
                return sendMessageDelegate;
            }
            set
            {
                sendMessageDelegate = value;
            }
        }

        /// <summary>
        /// Gets or sets the user abort delegate.
        /// </summary>
        /// <value>
        /// The user abort delegate.
        /// </value>
        public UserAbortDelegate UserAbortDelegate
        {
            get
            {
                return userAbortDelegate;
            }
            set
            {
                userAbortDelegate = value;
            }
        }

        /// <summary>
        /// Gets or sets the dam project data.
        /// </summary>
        /// <value>
        /// The dam project data.
        /// </value>
        public DamProjectData DamProjectData { get; set; }

        private void SendMessage(LogMessage logMessage)
        {
            SendMessageDelegate?.Invoke(logMessage);
        }

        private void Progress(double progress)
        {
            ProgressDelegate?.Invoke(progress);
        }

        private bool UserAbort()
        {
            if (UserAbortDelegate != null)
            {
                return UserAbortDelegate();
            }
            else
            {
                return false;
            }
        }

        /// <summary>
        /// Validates the model.
        /// </summary>
        /// <returns>Validation messages in an XML string</returns>
        public string Validate()
        {
            SendMessage(new LogMessage() { MessageType = LogMessageType.Info, Message = Resources.StartValidation });
            SendMessage(new LogMessage() { MessageType = LogMessageType.Info, Message = Resources.EndValidation });
            return null;
        }

        /// <summary>
        /// Runs this instance.
        /// </summary>
        /// <returns>Returns the output in an XML string</returns>
        public string Run()
        {
            string outputXml;
            SendMessage(new LogMessage() { MessageType = LogMessageType.Info, Message = Resources.StartCalculation });

            List<LogMessage> calculationMessages = null;
            switch (DamProjectData.DamProjectType)
            {
                case DamProjectType.AssessmentRegional:
                    var regionalScenariosCalculator = new RegionalScenariosCalculation();
                    regionalScenariosCalculator.RegisterProgress(progressDelegate);
                    regionalScenariosCalculator.Execute(DamProjectData);
                    regionalScenariosCalculator.GetResults();
                    break;
                case DamProjectType.Operational:
                    throw new NotImplementedException();
                case DamProjectType.Design:
                    DesignCalculator designCalculator = new DesignCalculator();
                    designCalculator.RegisterProgress(progressDelegate);
                    designCalculator.Execute(DamProjectData);
                    break;
            }
            Output output = FillXmlOutputFromDam.CreateOutput(DamProjectData);
            outputXml = DamXmlSerialization.SaveOutputAsXmlString(output);
            SendMessage(new LogMessage() { MessageType = LogMessageType.Info, Message = Resources.EndCalculation });
            return outputXml;
        }
    }
}