using System;
using System.Data;
using System.Data.SqlClient;
using System.Globalization;
using SDA.DataProvider.Core;

namespace SDA.DataProvider.MSSQLWrappers
{
    class MSSQLCommandParameterWrapper : SDACommandParameterWrapper
    {
        internal SqlParameter Parameter;

        internal MSSQLCommandParameterWrapper(SqlParameter parameter)
        {
            Parameter = parameter;
        }

        protected override IDbDataParameter WrappedParameter
        {
            get
            {
                return Parameter;
            }
        }

        public override object Value
        {
            get
            {
                return Parameter.Value;
            }
            set
            {
                if (value is bool boolean)
                {
                    Parameter.Value = boolean ? 'T' : 'F';
                }
                else
                {
                    Parameter.Value = value;
                }
            }
        }

        public override SDADBType DBType
        {
            get
            {
                return MSSQLParameterTypeConverter.ConvertSqlDbTypeToSDADBType(Parameter.SqlDbType);
            }
            set
            {
                Parameter.SqlDbType = MSSQLParameterTypeConverter.ConvertSDADBTypeToSqlDbType(value);
            }
        }
    }

    class MSSQLParameterTypeConverter
    {
        public static SqlDbType ConvertSDADBTypeToSqlDbType(SDADBType type)
        {
            switch (type)
            {
                case SDADBType.Int:
                    return SqlDbType.Int;
                case SDADBType.String:
                    return SqlDbType.NVarChar;
                case SDADBType.Binary:
                    return SqlDbType.Image;
                case SDADBType.Char:
                    return SqlDbType.NChar;
                case SDADBType.DateTime:
                    return SqlDbType.DateTime;
                case SDADBType.Double:
                    return SqlDbType.Float;
                case SDADBType.Boolean:
                    return SqlDbType.Char;
                case SDADBType.LongString:
                    return SqlDbType.NText;
                case SDADBType.LongInt:
                    return SqlDbType.BigInt;
                case SDADBType.NonUnicodeString:
                    return SqlDbType.VarChar;
                case SDADBType.Guid:
                    return SqlDbType.UniqueIdentifier;
                default:
                    throw new NotImplementedException(type.ToString());
            }
        }

        public static SDADBType ConvertSqlDbTypeToSDADBType(SqlDbType type)
        {
            switch (type)
            {
                case SqlDbType.BigInt:
                    return SDADBType.LongInt;
                case SqlDbType.Binary:
                    return SDADBType.Binary;
                case SqlDbType.Bit:
                    return SDADBType.Boolean;
                case SqlDbType.Char:
                    return SDADBType.Char;
                case SqlDbType.DateTime:
                    return SDADBType.DateTime;
                case SqlDbType.Decimal:
                    throw new NotSupportedException(string.Format(CultureInfo.InvariantCulture, "Conversion from '{0}' is not supported.", type));
                case SqlDbType.Float:
                    return SDADBType.Double;
                case SqlDbType.Image:
                    return SDADBType.Binary;
                case SqlDbType.Int:
                    return SDADBType.Int;
                case SqlDbType.Money:
                    throw new NotSupportedException(string.Format(CultureInfo.InvariantCulture, "Conversion from '{0}' is not supported.", type));
                case SqlDbType.NChar:
                    return SDADBType.Char;
                case SqlDbType.NText:
                    return SDADBType.LongString;
                case SqlDbType.NVarChar:
                    return SDADBType.String;
                case SqlDbType.Real:
                    return SDADBType.Double;
                case SqlDbType.SmallDateTime:
                    return SDADBType.DateTime;
                case SqlDbType.SmallInt:
                    return SDADBType.Int;
                case SqlDbType.SmallMoney:
                    throw new NotSupportedException(string.Format(CultureInfo.InvariantCulture, "Conversion from '{0}' is not supported.", type));
                case SqlDbType.Text:
                    return SDADBType.LongString;
                case SqlDbType.Timestamp:
                    throw new NotSupportedException(string.Format(CultureInfo.InvariantCulture, "Conversion from '{0}' is not supported.", type));
                case SqlDbType.TinyInt:
                    throw new NotSupportedException(string.Format(CultureInfo.InvariantCulture, "Conversion from '{0}' is not supported.", type));
                case SqlDbType.UniqueIdentifier:
                    return SDADBType.Guid;
                case SqlDbType.VarBinary:
                    throw new NotSupportedException(string.Format(CultureInfo.InvariantCulture, "Conversion from '{0}' is not supported.", type));
                case SqlDbType.VarChar:
                    return SDADBType.NonUnicodeString;
                case SqlDbType.Variant:
                    throw new NotSupportedException(string.Format(CultureInfo.InvariantCulture, "Conversion from '{0}' is not supported.", type));
                default:
                    throw new NotImplementedException(type.ToString());
            }
        }
    }
}