// Copyright (c) 2004, 2016, Oracle and/or its affiliates. All rights reserved.
//
// This program is free software; you can redistribute it and/or modify
// it under the terms of the GNU General Public License, version 2.0, as
// published by the Free Software Foundation.
//
// This program is also distributed with certain software (including
// but not limited to OpenSSL) that is licensed under separate terms,
// as designated in a particular file or component or in included license
// documentation.  The authors of MySQL hereby grant you an
// additional permission to link the program and your derivative works
// with the separately licensed software that they have included with
// MySQL.
//
// Without limiting anything contained in the foregoing, this file,
// which is part of MySQL Connector/NET, is also subject to the
// Universal FOSS Exception, version 1.0, a copy of which can be found at
// http://oss.oracle.com/licenses/universal-foss-exception.
//
// 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 General Public License, version 2.0, for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software Foundation, Inc.,
// 51 Franklin St, Fifth Floor, Boston, MA 02110-1301  USA

using System;
using MySql.Data.MySqlClient;
using Sog.Properties;

namespace MySql.Data.Common
{
    /// <summary>
    /// Summary description for Version.
    /// </summary>
    internal struct DBVersion
    {
        private readonly string _srcString;

        public DBVersion(string s, int major, int minor, int build)
        {
            this.Major = major;
            this.Minor = minor;
            this.Build = build;
            this._srcString = s;
            this.IsEnterprise = s.ToLowerInvariant().Contains("-enterprise-");
        }

        public int Major { get; }

        public int Minor { get; }

        public int Build { get; }

        public bool IsEnterprise
        {
            get; private set;
        }

        public static DBVersion Parse(string versionString)
        {
            int start = 0;
            int index = versionString.IndexOf('.', start);
            if (index == -1)
            {
                throw new MySqlException(Resources.BadVersionFormat);
            }

            string val = versionString.Substring(start, index - start).Trim();
            int major = Convert.ToInt32(val, System.Globalization.NumberFormatInfo.InvariantInfo);

            start = index + 1;
            index = versionString.IndexOf('.', start);
            if (index == -1)
            {
                throw new MySqlException(Resources.BadVersionFormat);
            }

            val = versionString.Substring(start, index - start).Trim();
            int minor = Convert.ToInt32(val, System.Globalization.NumberFormatInfo.InvariantInfo);

            start = index + 1;
            int i = start;
            while (i < versionString.Length && Char.IsDigit(versionString, i))
            {
                i++;
            }

            val = versionString.Substring(start, i - start).Trim();
            int build = Convert.ToInt32(val, System.Globalization.NumberFormatInfo.InvariantInfo);

            return new DBVersion(versionString, major, minor, build);
        }

        public bool isAtLeast(int majorNum, int minorNum, int buildNum)
        {
            if (this.Major > majorNum)
            {
                return true;
            }

            if (this.Major == majorNum && this.Minor > minorNum)
            {
                return true;
            }

            if (this.Major == majorNum && this.Minor == minorNum && this.Build >= buildNum)
            {
                return true;
            }

            return false;
        }

        public override string ToString()
        {
            return this._srcString;
        }

    }
}