using System;
using System.Collections.Generic;
using System.Data;
using System.Data.SqlClient;
using System.Linq;
using System.Threading.Tasks;
using DigitalData.Modules.Database;
using DigitalData.Modules.Interfaces;
using Microsoft.AspNetCore.Mvc.Formatters;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.Options;

namespace ZUGFeRDRESTService
{
    public class Database: IDatabase
    {
        private DigitalData.Modules.Logging.Logger _Logger = null;
        private string _gdPictureKey = null;
        private Dictionary<string, XmlItemProperty> _propertyMap = null;

        private const string QUERY_GET_GDPICTURE_KEY = "SELECT LICENSE FROM TBDD_3RD_PARTY_MODULES WHERE NAME = 'GDPICTURE'";
        private const string QUERY_GET_PROPERTY_MAP = "SELECT * FROM TBDD_ZUGFERD_XML_ITEMS WHERE ACTIVE = 1 ORDER BY XML_PATH";

        public MSSQLServer MSSQL { get; set; }

        public Database(ILogging Logging, IConfiguration Config)
        {
            var oLogConfig = Logging.LogConfig;
            var oLogger = Logging.LogConfig.GetLogger();
            var oAppConfig = Config.GetSection("Config");

            oLogger.Debug("Establishing MSSQL Database connection..");
            MSSQL = new MSSQLServer(oLogConfig, oAppConfig["MSSQLConnectionString"]);

            oLogger.Debug("MSSQL Connection: [{0}]", MSSQL.CurrentConnectionString);

            _Logger = oLogger;
        }

        public string GetGDPictureKey()
        {
            if (_gdPictureKey == null)
                _gdPictureKey = MSSQL.GetScalarValue(QUERY_GET_GDPICTURE_KEY).ToString();

            return _gdPictureKey;
        }

        public Dictionary<string, XmlItemProperty> GetPropertyMap()
        {
            if (_propertyMap == null)
            {
                _Logger.Debug("Property map does not exist, creating.");

                _propertyMap = new Dictionary<string, XmlItemProperty>();
                var oDatatable = MSSQL.GetDatatable(QUERY_GET_PROPERTY_MAP);

                _Logger.Debug("Datatable Rows: [{0}]", oDatatable.Rows);

                foreach (DataRow oRow in oDatatable.Rows)
                {                
                    _propertyMap.Add(oRow["XML_PATH"].ToString(), new XmlItemProperty()
                    { 
                        Description = oRow["DESCRIPTION"].ToString(),
                        TableName = oRow["TABLE_NAME"].ToString(),
                        TableColumn = oRow["TABLE_COLUMN"].ToString(),
                        GroupScope = oRow["GROUP_SCOPE"].ToString(),
                        IsRequired = (bool)oRow["IS_REQUIRED"],
                        IsGrouped = (bool)oRow["IS_GROUPED"],
                        Specification = oRow["SPECIFICATION"].ToString()
                    });
                }
            } else
            {
                _Logger.Debug("Property map already exists, returning.");
            }

            _Logger.Debug("Returning Property Map with [{0}] entries.", _propertyMap.Count);

            return _propertyMap;
        }
    }
}