using System;
using Deltares.DamEngine.Data.Standard;
using Deltares.DamEngine.Data.Standard.Logging;

namespace Deltares.DamEngine.Interface
{
    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">The model input.</param>
        public EngineInterface(string modelInput)
        {
            if (String.IsNullOrEmpty(modelInput))
            {
                throw new EngineInterfaceException("Error: empty input string");
            }
            SendMessage(new LogMessage() { MessageType = LogMessageType.Info, Message = "Model accepted" });
        }

        /// <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;
            }
        }

        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 = "Start validation"});
            SendMessage(new LogMessage() { MessageType = LogMessageType.Info, Message = "End validation" });
            return null;
        }

        /// <summary>
        /// Runs this instance.
        /// </summary>
        /// <returns>Errors and warnings in an XML string</returns>
        public string Run()
        {
            SendMessage(new LogMessage() { MessageType = LogMessageType.Info, Message = "Start calcualtion" });
            SendMessage(new LogMessage() { MessageType = LogMessageType.Info, Message = "End calcualtion" });
            return null;
        }

    }
}