///
/// Copyright (c) 2013-2020 Sensus Slovensko a.s.
///
using System;
using System.Text;
using System.Xml.Serialization;

namespace Common
{
    /// <summary>
    /// Test bench database settings, contains bench name and settings od several databases
    /// </summary>
    public class DatabaseSettings : ICloneable, IComparable
    {
        // Public fields
        public string BenchName;
        public bool IsRealBench;
        public DBSettings ProceduresDBSettings;	    /// Configuration database settings
        public DBSettings WaterMetersDBSettings;	/// Results database settings
        public DBSettings EventsDBSettings;	        /// Events database settings
        public DBSettings UsersDBSettings;		    /// Shared configuration database settings

        // Constructor
        public DatabaseSettings()
        {
            BenchName = String.Empty;               /// Empty string (avoid null)
            IsRealBench = false;
			ProceduresDBSettings  = new DBSettings(DBType.MySql, string.Empty);
			WaterMetersDBSettings = new DBSettings(DBType.MySql, string.Empty);
            EventsDBSettings      = new DBSettings(DBType.MySql, string.Empty);
			UsersDBSettings       = new DBSettings(DBType.MySql, string.Empty);
        }

        public object Clone()
        {
            DatabaseSettings result = new DatabaseSettings();

            result.BenchName    = BenchName;
            result.IsRealBench  = IsRealBench;
            result.ProceduresDBSettings = (DBSettings)ProceduresDBSettings.Clone();
            result.WaterMetersDBSettings = (DBSettings)WaterMetersDBSettings.Clone();
            result.EventsDBSettings = (DBSettings)EventsDBSettings.Clone();
            result.UsersDBSettings = (DBSettings)UsersDBSettings.Clone();

            return result;
        }

        public int CompareTo(object dbs2)
        {
            if (!(dbs2 is DatabaseSettings)) return 0;
            return String.Compare(BenchName, (dbs2 as DatabaseSettings).BenchName);
        }


        /// <summary>
        /// Extract and return a DB server from a MySQL connection string.
        /// </summary>
        public static string GetDBServer(string connectionString)
        {
            return GetFromConnectionString(connectionString, new string[] { "SERVER=" });
        }

        /// <summary>
        /// Extract and return a DB name from a MySQL connection string.
        /// </summary>
        public static string GetDBName(string connectionString)
        {
            return GetFromConnectionString(connectionString, new string[] { "DATABASE=" });
        }

        /// <summary>
        /// Extract and return a username from a MySQL connection string
        /// </summary>
        public static string GetDBUser(string connectionString)
        {
            return GetFromConnectionString(connectionString, new string[] { "USER=", "UID=" });
        }

        /// <summary>
        /// Extract and return a password from a MySQL connection string
        /// </summary>
        public static string GetDBPassword(string connectionString)
        {
            return GetFromConnectionString(connectionString, new string[] { "PASSWORD=", "PWD=" });
        }

        /// <summary>
        /// Extract and return an element of a MySQL connection string
        /// (a host, a database, a user name or a password).
        /// Return an empty string on any error.
        /// </summary>
        public static string GetFromConnectionString(string connectionString, string[] patterns)
        {
            foreach (var pattern in patterns)
            {
                int startIx = connectionString.IndexOf(pattern);
                if (startIx >= 0)
                {
                    /// pattern found, extract the subsequent element
                    startIx += pattern.Length;
                    int endIx = connectionString.IndexOf(';', startIx);
                    return (endIx > 0) ? connectionString.Substring(startIx, endIx - startIx) : string.Empty;
                }
            }

            /// pattern NOT found
            return string.Empty;
        }


		public override string ToString()
		{
            return string.Format("{0} config={1} results={2} events={3} users={4}",
                                 BenchName,
                                 ProceduresDBSettings.ConnectionString,
                                 WaterMetersDBSettings.ConnectionString,
                                 EventsDBSettings.ConnectionString,
                                 UsersDBSettings.ConnectionString);
		}
    }
}