// Copyright (c) 2019, 2020, 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 MySql.Data.Common;
using MySql.Data.MySqlClient;

// using MySqlX.XDevAPI;
using System;
using System.Data.Common;
using System.Globalization;
using System.Linq;
using System.Reflection;
using Sog.Properties;

namespace MySql.Data.common
{
    internal class MySqlConnectionStringOption
    {
        public MySqlConnectionStringOption(string keyword, string synonyms, Type baseType, object defaultValue, bool obsolete,
          SetterDelegate setter, GetterDelegate getter)
        {
            this.Keyword = StringUtility.ToLowerInvariant(keyword);
            if (synonyms != null)
            {
                this.Synonyms = StringUtility.ToLowerInvariant(synonyms).Split(',');
            }

            this.BaseType = baseType;
            this.Obsolete = obsolete;
            this.DefaultValue = defaultValue;
            this.Setter = setter;
            this.Getter = getter;
            this.IsCustomized = true;
        }

        public MySqlConnectionStringOption(string keyword, string synonyms, Type baseType, object defaultValue, bool obsolete,
          ClassicSetterDelegate setter, ClassicGetterDelegate getter)
        {
            this.Keyword = StringUtility.ToLowerInvariant(keyword);
            if (synonyms != null)
            {
                this.Synonyms = StringUtility.ToLowerInvariant(synonyms).Split(',');
            }

            this.BaseType = baseType;
            this.Obsolete = obsolete;
            this.DefaultValue = defaultValue;
            this.ClassicSetter = setter;
            this.ClassicGetter = getter;
            this.IsCustomized = true;
        }

        // public MySqlConnectionStringOption(string keyword, string synonyms, Type baseType, object defaultValue, bool obsolete,
        // XSetterDelegate setter, XGetterDelegate getter)
        // {
        //  Keyword = StringUtility.ToLowerInvariant(keyword);
        //  if (synonyms != null)
        //    Synonyms = StringUtility.ToLowerInvariant(synonyms).Split(',');
        //  BaseType = baseType;
        //  Obsolete = obsolete;
        //  DefaultValue = defaultValue;
        //  XSetter = setter;
        //  XGetter = getter;
        //  IsCustomized = true;
        // }

        public MySqlConnectionStringOption(string keyword, string synonyms, Type baseType, object defaultValue, bool obsolete) :
          this(keyword, synonyms, baseType, defaultValue, obsolete,
           delegate (MySqlBaseConnectionStringBuilder msb, MySqlConnectionStringOption sender, object value)
           {
               sender.ValidateValue(ref value);
               msb.SetInternalValue(sender.Keyword, Convert.ChangeType(value, sender.BaseType));
           },
           (msb, sender) => msb.values[sender.Keyword]
          )
        {
            this.IsCustomized = false;
        }

        #region Properties

        public Type BaseType { get; private set; }
        public bool IsCustomized { get; }
        public string[] Synonyms { get; private set; }
        public bool Obsolete { get; private set; }
        public string Keyword { get; private set; }
        public object DefaultValue { get; private set; }
        public SetterDelegate Setter { get; private set; }
        public GetterDelegate Getter { get; private set; }
        public ClassicSetterDelegate ClassicSetter { get; private set; }
        public ClassicGetterDelegate ClassicGetter { get; private set; }

        // public XSetterDelegate XSetter { get; private set; }
        // public XGetterDelegate XGetter { get; private set; }

        #endregion

        #region Delegates

        public delegate void SetterDelegate(MySqlBaseConnectionStringBuilder msb, MySqlConnectionStringOption sender, object value);

        public delegate object GetterDelegate(MySqlBaseConnectionStringBuilder msb, MySqlConnectionStringOption sender);

        public delegate void ClassicSetterDelegate(MySqlConnectionStringBuilder msb, MySqlConnectionStringOption sender, object value);

        public delegate object ClassicGetterDelegate(MySqlConnectionStringBuilder msb, MySqlConnectionStringOption sender);

        // public delegate void XSetterDelegate(MySqlXConnectionStringBuilder msb, MySqlConnectionStringOption sender, object value);

        // public delegate object XGetterDelegate(MySqlXConnectionStringBuilder msb, MySqlConnectionStringOption sender);

        #endregion

        public bool HasKeyword(string key)
        {
            if (this.Keyword == key)
            {
                return true;
            }

            if (this.Synonyms == null)
            {
                return false;
            }

            return this.Synonyms.Any(syn => syn == key);
        }

        public void Clean(DbConnectionStringBuilder builder)
        {
            builder.Remove(this.Keyword);
            if (this.Synonyms == null)
            {
                return;
            }

            foreach (var syn in this.Synonyms)
            {
                builder.Remove(syn);
            }
        }

        public void ValidateValue(ref object value, string keyword = null, bool isXProtocol = false)
        {
            bool b;
            if (value == null)
            {
                return;
            }

            string typeName = this.BaseType.Name;
            Type valueType = value.GetType();
            if (valueType.Name == "String")
            {
                if (this.BaseType == valueType)
                {
                    return;
                }
                else if (this.BaseType == typeof(bool))
                {
                    if (string.Compare("yes", (string)value, StringComparison.OrdinalIgnoreCase) == 0)
                    {
                        value = true;
                    }
                    else if (string.Compare("no", (string)value, StringComparison.OrdinalIgnoreCase) == 0)
                    {
                        value = false;
                    }
                    else if (Boolean.TryParse(value.ToString(), out b))
                    {
                        value = b;
                    }
                    else
                    {
                        throw new ArgumentException(String.Format(Resources.ValueNotCorrectType, value));
                    }

                    return;
                }
            }

            if (typeName == "Boolean" && Boolean.TryParse(value.ToString(), out b)) { value = b; return; }

            UInt64 uintVal;
            if (typeName.StartsWith("UInt64") && UInt64.TryParse(value.ToString(), NumberStyles.Any, CultureInfo.InvariantCulture, out uintVal)) { value = uintVal; return; }

            UInt32 uintVal32;
            if (typeName.StartsWith("UInt32") && UInt32.TryParse(value.ToString(), NumberStyles.Any, CultureInfo.InvariantCulture, out uintVal32)) { value = uintVal32; return; }

            Int64 intVal;
            if (typeName.StartsWith("Int64") && Int64.TryParse(value.ToString(), NumberStyles.Any, CultureInfo.InvariantCulture, out intVal)) { value = intVal; return; }

            Int32 intVal32;
            if (typeName.StartsWith("Int32") && Int32.TryParse(value.ToString(), NumberStyles.Any, CultureInfo.InvariantCulture, out intVal32)) { value = intVal32; return; }

            object objValue;
            Type baseType = this.BaseType.GetTypeInfo().BaseType;
            if (baseType != null && baseType.Name == "Enum" && this.ParseEnum(value.ToString(), out objValue))
            {
                value = objValue;
                return;
            }

            if (!string.IsNullOrEmpty(keyword) && isXProtocol)
            {
                switch (keyword)
                {
                    case "compression":
                        throw new ArgumentException(string.Format(ResourcesX.CompressionInvalidValue, value));
                }
            }

            throw new ArgumentException(String.Format(Resources.ValueNotCorrectType, value));
        }

        public void ValidateValue(ref object value, string keyword)
        {
            string typeName = this.BaseType.Name;
            Type valueType = value.GetType();

            switch (keyword)
            {
                case "connect-timeout":
                    if (typeName != valueType.Name && !uint.TryParse(value.ToString(), NumberStyles.Any, CultureInfo.InvariantCulture, out uint uintVal))
                    {
                        throw new FormatException(ResourcesX.InvalidConnectionTimeoutValue);
                    }

                    break;
            }
        }

        private bool ParseEnum(string requestedValue, out object value)
        {
            value = null;
            try
            {
                value = Enum.Parse(this.BaseType, requestedValue, true);
                if (value != null && Enum.IsDefined(this.BaseType, value.ToString()))
                {
                    return true;
                }
                else
                {
                    value = null;
                    return false;
                }
            }
            catch (ArgumentException)
            {
                return false;
            }
        }
    }
}