#region Disclaimer / License

// Copyright (C) 2010, Jackie Ng
// http://trac.osgeo.org/mapguide/wiki/maestro, jumpinjackie@gmail.com
//
// This library is free software; you can redistribute it and/or
// modify it under the terms of the GNU Lesser General Public
// License as published by the Free Software Foundation; either
// version 2.1 of the License, or (at your option) any later version.
//
// This library 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
// Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public
// License along with this library; if not, write to the Free Software
// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
//

#endregion Disclaimer / License

using GeoAPI.Geometries;
using OSGeo.MapGuide.MaestroAPI.Schema;
using System;
using System.Globalization;

namespace OSGeo.MapGuide.MaestroAPI.Feature
{
    /// <summary>
    /// Base class of all MapGuide property values. Functions as a nullable box type
    /// around an underlying data type
    /// </summary>
    public abstract class PropertyValue
    {
        /// <summary>
        /// Initializes a new instance of the <see cref="PropertyValue"/> class.
        /// </summary>
        protected PropertyValue()
        {
            this.IsNull = true;
        }

        /// <summary>
        /// Gets or sets a value indicating whether this instance is null.
        /// </summary>
        /// <value>
        ///   <c>true</c> if this instance is null; otherwise, <c>false</c>.
        /// </value>
        public virtual bool IsNull { get; protected set; }

        /// <summary>
        /// Sets the value to null.
        /// </summary>
        public virtual void SetNull() => this.IsNull = true;

        /// <summary>
        /// Gets the type.
        /// </summary>
        public abstract PropertyValueType Type { get; }

        /// <summary>
        /// Gets the suggsted property definition type for this value
        /// </summary>
        /// <value>
        /// The suggsted property definition type.
        /// </value>
        public abstract PropertyDefinitionType PropertyDefType { get; }

        /// <summary>
        /// Gets the value as a string
        /// </summary>
        /// <returns></returns>
        public abstract string ValueAsString();
    }

    /// <summary>
    /// Base class of all nullable value type property values.
    /// </summary>
    /// <typeparam name="T"></typeparam>
    public abstract class ValueTypePropertyValue<T> : PropertyValue where T : struct
    {
        /// <summary>
        /// Initializes a new instance of the <see cref="ValueTypePropertyValue&lt;T&gt;"/> class.
        /// </summary>
        protected ValueTypePropertyValue()
            : base()
        {
        }

        /// <summary>
        /// Initializes a new instance of the <see cref="ValueTypePropertyValue&lt;T&gt;"/> class.
        /// </summary>
        /// <param name="value">The value.</param>
        protected ValueTypePropertyValue(T value)
            : base()
        {
            _value = value;
        }

        private Nullable<T> _value;

        /// <summary>
        /// Gets or sets a value indicating whether this instance is null.
        /// </summary>
        /// <value>
        ///   <c>true</c> if this instance is null; otherwise, <c>false</c>.
        /// </value>
        public override bool IsNull => !_value.HasValue;

        /// <summary>
        /// Gets or sets the value.
        /// </summary>
        /// <value>
        /// The value.
        /// </value>
        public T Value
        {
            get
            {
                if (IsNull)
                    throw new Exception(Strings.ErrorNullValue); //LOCALIZEME

                return _value.Value;
            }
            set
            {
                _value = value;
            }
        }

        /// <summary>
        /// Sets the value to null.
        /// </summary>
        public override void SetNull() => _value = null;

        /// <summary>
        /// Gets the suggsted property definition type for this value
        /// </summary>
        /// <value>
        /// The suggsted property definition type.
        /// </value>
        public override PropertyDefinitionType PropertyDefType => PropertyDefinitionType.Data;
    }

    /// <summary>
    /// Base class of all reference type property values
    /// </summary>
    /// <typeparam name="T"></typeparam>
    public abstract class ReferenceTypePropertyValue<T> : PropertyValue where T : class
    {
        /// <summary>
        /// Initializes a new instance of the <see cref="ReferenceTypePropertyValue&lt;T&gt;"/> class.
        /// </summary>
        protected ReferenceTypePropertyValue()
            : base()
        {
        }

        /// <summary>
        /// Initializes a new instance of the <see cref="ReferenceTypePropertyValue&lt;T&gt;"/> class.
        /// </summary>
        /// <param name="value">The value.</param>
        protected ReferenceTypePropertyValue(T value)
            : base()
        {
            this.Value = value;
        }

        private T _value;

        /// <summary>
        /// Gets or sets the value.
        /// </summary>
        /// <value>
        /// The value.
        /// </value>
        public T Value
        {
            get
            {
                if (IsNull)
                    throw new Exception(Strings.ErrorNullValue);

                return _value;
            }
            set
            {
                _value = value;
                this.IsNull = (value == null);
            }
        }
    }

    /// <summary>
    /// Stores byte data
    /// </summary>
    public class ByteValue : ValueTypePropertyValue<byte>
    {
        /// <summary>
        /// Initializes this instance
        /// </summary>
        public ByteValue()
            : base()
        {
        }

        /// <summary>
        /// Initializes this instance
        /// </summary>
        public ByteValue(byte value)
            : base()
        {
        }

        /// <summary>
        /// Gets the type.
        /// </summary>
        public override PropertyValueType Type => PropertyValueType.Byte;

        /// <summary>
        /// Gets the value as a string
        /// </summary>
        /// <returns></returns>
        public override string ValueAsString()
        {
            if (IsNull)
                throw new Exception(Strings.ErrorNullValue);

            return this.Value.ToString(CultureInfo.InvariantCulture);
        }
    }

    /// <summary>
    /// Stores boolean data
    /// </summary>
    public class BooleanValue : ValueTypePropertyValue<bool>
    {
        /// <summary>
        /// Initializes a new instance
        /// </summary>
        public BooleanValue()
            : base()
        {
        }

        /// <summary>
        /// Initializes a new instance
        /// </summary>
        public BooleanValue(bool value)
            : base(value)
        {
        }

        /// <summary>
        /// Gets the type.
        /// </summary>
        public override PropertyValueType Type => PropertyValueType.Boolean;

        /// <summary>
        /// Gets the value as a string
        /// </summary>
        /// <returns></returns>
        public override string ValueAsString()
        {
            if (IsNull)
                throw new Exception(Strings.ErrorNullValue);

            return this.Value.ToString();
        }
    }

    /// <summary>
    /// Stores blob data
    /// </summary>
    public class BlobValue : ReferenceTypePropertyValue<byte[]>
    {
        /// <summary>
        /// Initializes a new instance
        /// </summary>
        public BlobValue()
            : base()
        {
        }

        /// <summary>
        /// Initializes a new instance
        /// </summary>
        public BlobValue(byte[] value)
            : base(value)
        {
        }

        /// <summary>
        /// Gets the type.
        /// </summary>
        public override PropertyValueType Type => PropertyValueType.Blob;

        /// <summary>
        /// Gets the suggsted property definition type for this value
        /// </summary>
        /// <value>
        /// The suggsted property definition type.
        /// </value>
        public override PropertyDefinitionType PropertyDefType => PropertyDefinitionType.Data;

        /// <summary>
        /// Gets the value as a string
        /// </summary>
        /// <returns></returns>
        public override string ValueAsString()
        {
            throw new NotSupportedException();
        }
    }

    /// <summary>
    /// Stores clob data
    /// </summary>
    public class ClobValue : ReferenceTypePropertyValue<char[]>
    {
        /// <summary>
        /// Initializes a new instance
        /// </summary>
        public ClobValue()
            : base()
        {
        }

        /// <summary>
        /// Initializes a new instance
        /// </summary>
        public ClobValue(char[] value)
            : base(value)
        {
        }

        /// <summary>
        /// Gets the type.
        /// </summary>
        public override PropertyValueType Type => PropertyValueType.Clob;

        /// <summary>
        /// Gets the suggsted property definition type for this value
        /// </summary>
        /// <value>
        /// The suggsted property definition type.
        /// </value>
        public override PropertyDefinitionType PropertyDefType => PropertyDefinitionType.Data;

        /// <summary>
        /// Gets the value as a string
        /// </summary>
        /// <returns></returns>
        public override string ValueAsString()
        {
            throw new NotSupportedException();
        }
    }

    /// <summary>
    /// Stores datetime data
    /// </summary>
    public class DateTimeValue : ValueTypePropertyValue<DateTime>
    {
        /// <summary>
        /// Initializes a new instance
        /// </summary>
        public DateTimeValue()
            : base()
        {
        }

        /// <summary>
        /// Initializes a new instance
        /// </summary>
        public DateTimeValue(DateTime value)
            : base(value)
        {
        }

        /// <summary>
        /// Gets the type.
        /// </summary>
        public override PropertyValueType Type => PropertyValueType.DateTime;

        private static string PadLeft(string str, char ch, int totalChars)
        {
            var value = str;
            while (value.Length < totalChars)
                value = ch + value;
            return value;
        }

        /// <summary>
        /// Gets the value as a string
        /// </summary>
        /// <returns></returns>
        public override string ValueAsString()
        {
            if (IsNull)
                throw new Exception(Strings.ErrorNullValue);

            var dt = this.Value;
            return string.Format("TIMESTAMP '{0}-{1}-{2} {3}:{4}:{5}'", //NOXLATE
                PadLeft(dt.Year.ToString(), '0', 4), //NOXLATE
                PadLeft(dt.Month.ToString(), '0', 2), //NOXLATE
                PadLeft(dt.Year.ToString(), '0', 2), //NOXLATE
                PadLeft(dt.Hour.ToString(), '0', 2), //NOXLATE
                PadLeft(dt.Minute.ToString(), '0', 2), //NOXLATE
                PadLeft(dt.Second.ToString(), '0', 2)); //NOXLATE
        }
    }

    /// <summary>
    /// Stores double data
    /// </summary>
    public class DoubleValue : ValueTypePropertyValue<double>
    {
        /// <summary>
        /// Initializes a new instance
        /// </summary>
        public DoubleValue()
            : base()
        {
        }

        /// <summary>
        /// Initializes a new instance
        /// </summary>
        public DoubleValue(double value)
            : base(value)
        {
        }

        /// <summary>
        /// Gets the type.
        /// </summary>
        public override PropertyValueType Type => PropertyValueType.Double;

        /// <summary>
        /// Gets the value as a string
        /// </summary>
        /// <returns></returns>
        public override string ValueAsString()
        {
            if (IsNull)
                throw new Exception(Strings.ErrorNullValue);

            return this.Value.ToString(CultureInfo.InvariantCulture);
        }
    }

    /// <summary>
    /// Stores feature data
    /// </summary>
    public class FeatureValue : ReferenceTypePropertyValue<IFeature[]>
    {
        /// <summary>
        /// Initializes a new instance
        /// </summary>
        public FeatureValue()
            : base()
        {
        }

        /// <summary>
        /// Initializes a new instance
        /// </summary>
        public FeatureValue(IFeature[] values)
            : base(values)
        {
        }

        /// <summary>
        /// Gets the type.
        /// </summary>
        public override PropertyValueType Type => PropertyValueType.Feature;

        /// <summary>
        /// Gets the suggsted property definition type for this value
        /// </summary>
        /// <value>
        /// The suggsted property definition type.
        /// </value>
        public override PropertyDefinitionType PropertyDefType => PropertyDefinitionType.Object;

        /// <summary>
        /// Gets the value as a string
        /// </summary>
        /// <returns></returns>
        public override string ValueAsString()
        {
            if (IsNull)
                throw new Exception(Strings.ErrorNullValue);

            throw new NotSupportedException();
        }
    }

    /// <summary>
    /// Stores geometry data
    /// </summary>
    public class GeometryValue : ReferenceTypePropertyValue<IGeometry>
    {
        /// <summary>
        /// Initializes a new instance
        /// </summary>
        public GeometryValue()
            : base()
        {
        }

        /// <summary>
        /// Initializes a new instance
        /// </summary>
        public GeometryValue(IGeometry value)
            : base(value)
        {
        }

        /// <summary>
        /// Gets the type.
        /// </summary>
        public override PropertyValueType Type => PropertyValueType.Geometry;

        /// <summary>
        /// Gets the suggsted property definition type for this value
        /// </summary>
        /// <value>
        /// The suggsted property definition type.
        /// </value>
        public override PropertyDefinitionType PropertyDefType => PropertyDefinitionType.Geometry;

        /// <summary>
        /// Gets the value as a string
        /// </summary>
        /// <returns></returns>
        public override string ValueAsString()
        {
            if (IsNull)
                throw new Exception(Strings.ErrorNullValue);

            return this.Value.AsText();
        }
    }

    /// <summary>
    /// Stores int16 data
    /// </summary>
    public class Int16Value : ValueTypePropertyValue<short>
    {
        /// <summary>
        /// Initializes a new instance
        /// </summary>
        public Int16Value()
            : base()
        {
        }

        /// <summary>
        /// Initializes a new instance
        /// </summary>
        public Int16Value(short value)
            : base(value)
        {
        }

        /// <summary>
        /// Gets the type.
        /// </summary>
        public override PropertyValueType Type => PropertyValueType.Int16;

        /// <summary>
        /// Gets the value as a string
        /// </summary>
        /// <returns></returns>
        public override string ValueAsString()
        {
            if (IsNull)
                throw new Exception(Strings.ErrorNullValue);

            return this.Value.ToString(CultureInfo.InvariantCulture);
        }
    }

    /// <summary>
    /// Stores int32 data
    /// </summary>
    public class Int32Value : ValueTypePropertyValue<int>
    {
        /// <summary>
        /// Initializes a new instance
        /// </summary>
        public Int32Value()
            : base()
        {
        }

        /// <summary>
        /// Initializes a new instance
        /// </summary>
        public Int32Value(int value)
            : base(value)
        {
        }

        /// <summary>
        /// Gets the type.
        /// </summary>
        public override PropertyValueType Type => PropertyValueType.Int32;

        /// <summary>
        /// Gets the value as a string
        /// </summary>
        /// <returns></returns>
        public override string ValueAsString()
        {
            if (IsNull)
                throw new Exception(Strings.ErrorNullValue);

            return this.Value.ToString(CultureInfo.InvariantCulture);
        }
    }

    /// <summary>
    /// Stores int64 data
    /// </summary>
    public class Int64Value : ValueTypePropertyValue<long>
    {
        /// <summary>
        /// Initializes a new instance
        /// </summary>
        public Int64Value()
            : base()
        {
        }

        /// <summary>
        /// Initializes a new instance
        /// </summary>
        public Int64Value(long value)
            : base(value)
        {
        }

        /// <summary>
        /// Gets the type.
        /// </summary>
        public override PropertyValueType Type => PropertyValueType.Int64;

        /// <summary>
        /// Gets the value as a string
        /// </summary>
        /// <returns></returns>
        public override string ValueAsString()
        {
            if (IsNull)
                throw new Exception(Strings.ErrorNullValue);

            return this.Value.ToString(CultureInfo.InvariantCulture);
        }
    }

    /// <summary>
    /// Stores raster data
    /// </summary>
    public class RasterValue : ReferenceTypePropertyValue<byte[]>
    {
        /// <summary>
        /// Initializes a new instance
        /// </summary>
        public RasterValue()
            : base()
        {
        }

        /// <summary>
        /// Initializes a new instance
        /// </summary>
        public RasterValue(byte[] value)
            : base(value)
        {
        }

        /// <summary>
        /// Gets the type.
        /// </summary>
        public override PropertyValueType Type => PropertyValueType.Raster;

        /// <summary>
        /// Gets the suggsted property definition type for this value
        /// </summary>
        /// <value>
        /// The suggsted property definition type.
        /// </value>
        public override PropertyDefinitionType PropertyDefType => PropertyDefinitionType.Raster;

        /// <summary>
        /// Gets the value as a string
        /// </summary>
        /// <returns></returns>
        public override string ValueAsString()
        {
            throw new NotSupportedException();
        }
    }

    /// <summary>
    /// Stores float data
    /// </summary>
    public class SingleValue : ValueTypePropertyValue<float>
    {
        /// <summary>
        /// Initializes a new instance
        /// </summary>
        public SingleValue()
            : base()
        {
        }

        /// <summary>
        /// Initializes a new instance
        /// </summary>
        public SingleValue(float value)
            : base(value)
        {
        }

        /// <summary>
        /// Gets the type.
        /// </summary>
        public override PropertyValueType Type => PropertyValueType.Single;

        /// <summary>
        /// Gets the value as a string
        /// </summary>
        /// <returns></returns>
        public override string ValueAsString()
        {
            if (IsNull)
                throw new Exception(Strings.ErrorNullValue);

            return this.Value.ToString(CultureInfo.InvariantCulture);
        }
    }

    /// <summary>
    /// Stores string data
    /// </summary>
    public class StringValue : ReferenceTypePropertyValue<string>
    {
        /// <summary>
        /// Initializes a new instance
        /// </summary>
        public StringValue()
            : base()
        {
        }

        /// <summary>
        /// Initializes a new instance
        /// </summary>
        public StringValue(string value)
            : base(value)
        {
        }

        /// <summary>
        /// Gets the type.
        /// </summary>
        public override PropertyValueType Type => PropertyValueType.String;

        /// <summary>
        /// Gets the suggsted property definition type for this value
        /// </summary>
        /// <value>
        /// The suggsted property definition type.
        /// </value>
        public override PropertyDefinitionType PropertyDefType => PropertyDefinitionType.Data;

        /// <summary>
        /// Gets the value as a string
        /// </summary>
        /// <returns></returns>
        public override string ValueAsString()
        {
            if (IsNull)
                throw new Exception(Strings.ErrorNullValue);

            return this.Value;
        }
    }
}