// Copyright (c) 2017- schick Informatik
// Description:
//

using Microsoft.Office.Interop.Excel;
using System;
using System.Collections.Generic;
using System.Data;
using System.Linq;
using System.Reflection;

using bsmd.database;

namespace ENI2.Excel
{
    internal class ExcelWriter : ExcelBase
    {

        #region Fields

        private readonly string _saveFilePath;

        #endregion

        #region Construction

        public ExcelWriter(string filePath) : base(filePath)
        {
            string refFilePath = @"Excel\Reference_Sheet_DE.xlsx";
            this._workBook = _excelWorkbooks.Open(refFilePath, 0, true, 5, "", "", false, XlPlatform.xlWindows, "", false, false, 0, false, false, false);

            this.InitNameFields();
            _saveFilePath = filePath;
        }

        #endregion

        #region public methods

        public void WriteData(List<Message> messages, MessageCore core, out string resultMessage)
        {
            resultMessage = "";

            foreach (Message message in messages)
            {
                try
                {
                    this.WriteMessage(message);
                }
                catch (Exception ex)
                {
                    resultMessage += string.Format("{2}:{0}{1}", ex.Message, Environment.NewLine, message.MessageNotificationClassDisplay);
                }
            }

            WriteCore(core);

        }

        public void Save()
        {
            this._workBook.SaveAs(_saveFilePath, XlFileFormat.xlOpenXMLWorkbook, Type.Missing, Type.Missing, Type.Missing, Type.Missing, XlSaveAsAccessMode.xlNoChange,
                Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing);
            this._workBook.Saved = true;
            this._workBook.Close();
        }

        #endregion

        #region private excel field writing

        private void WriteMessage(DatabaseEntity dbEntity)
        {
            Type objType = dbEntity.GetType();
            List<PropertyInfo> props = new List<PropertyInfo>();

            // add lookup properties to scan list
            props.AddRange(objType.GetProperties().Where(prop => Attribute.IsDefined(prop, typeof(LookupNameAttribute))));

            foreach (PropertyInfo property in props)
            {
                object propValue = property.GetValue(dbEntity, null);
                string value = (propValue == null) ? string.Empty : propValue.ToString();
                LookupNameAttribute lookupNameAttribute = Attribute.GetCustomAttribute(property, typeof(LookupNameAttribute)) as LookupNameAttribute;
                bool success = true;

                if (property.PropertyType == typeof(DateTime?))
                {
                    success = this.WriteDate(lookupNameAttribute.LookupName, property.GetValue(dbEntity));                    
                }
                else if (property.PropertyType == typeof(double?))
                {
                    success = this.WriteNumber(lookupNameAttribute.LookupName, property.GetValue(dbEntity));
                }
                else if (property.PropertyType == typeof(string))
                {
                    success = this.WriteText(lookupNameAttribute.LookupName, property.GetValue(dbEntity));
                }
                else if (property.PropertyType == typeof(int?))
                {
                    success = this.WriteNumber(lookupNameAttribute.LookupName, property.GetValue(dbEntity));
                }
                else if (property.PropertyType == typeof(byte?))
                {
                    success = this.WriteNumber(lookupNameAttribute.LookupName, property.GetValue(dbEntity));
                }
                else if (property.PropertyType == typeof(Boolean?))
                {
                    success = this.WriteBoolean(lookupNameAttribute.LookupName, property.GetValue(dbEntity));
                }
                else
                {
                    string message = string.Format("unhandled property type: {0} for lookup {1}", property.PropertyType, lookupNameAttribute.LookupName);
                    _log.Warn(message);
                }

                if(!success)
                {
                    string message = string.Format("Sheet does not contain lookup field {0}", lookupNameAttribute.LookupName);
                    _log.Error(message);
                    throw new FormatException(message);
                }
            }          
        }

        private void WriteCore(MessageCore core)
        {

        }

        private bool WriteBoolean(string lookupName, object v)
        {
            throw new NotImplementedException();
        }

        private bool WriteText(string lookupName, object v)
        {
            throw new NotImplementedException();
        }

        private bool WriteNumber(string lookupName, object v)
        {
            throw new NotImplementedException();
        }

        private bool WriteDate(string lookupName, object v)
        {
            throw new NotImplementedException();
        }

        #endregion

    }
}