// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.

using System;
using System.Collections;
using System.ComponentModel;
using System.IO;
using System.Xml;

namespace System.Xml.Serialization
{
    public delegate void XmlAttributeEventHandler(object? sender, XmlAttributeEventArgs e);

    public class XmlAttributeEventArgs : EventArgs
    {
        private readonly object? _o;
        private readonly XmlAttribute _attr;
        private readonly string? _qnames;
        private readonly int _lineNumber;
        private readonly int _linePosition;


        internal XmlAttributeEventArgs(XmlAttribute attr, int lineNumber, int linePosition, object? o, string? qnames)
        {
            _attr = attr;
            _o = o;
            _qnames = qnames;
            _lineNumber = lineNumber;
            _linePosition = linePosition;
        }

        public object? ObjectBeingDeserialized
        {
            get { return _o; }
        }

        public XmlAttribute Attr
        {
            get { return _attr; }
        }

        /// <summary>
        /// Gets the current line number.
        /// </summary>
        public int LineNumber
        {
            get { return _lineNumber; }
        }

        /// <summary>
        /// Gets the current line position.
        /// </summary>
        public int LinePosition
        {
            get { return _linePosition; }
        }

        /// <summary>
        /// List the qnames of attributes expected in the current context.
        /// </summary>
        public string ExpectedAttributes
        {
            get { return _qnames ?? string.Empty; }
        }
    }

    public delegate void XmlElementEventHandler(object? sender, XmlElementEventArgs e);

    public class XmlElementEventArgs : EventArgs
    {
        private readonly object? _o;
        private readonly XmlElement _elem;
        private readonly string? _qnames;
        private readonly int _lineNumber;
        private readonly int _linePosition;

        internal XmlElementEventArgs(XmlElement elem, int lineNumber, int linePosition, object? o, string? qnames)
        {
            _elem = elem;
            _o = o;
            _qnames = qnames;
            _lineNumber = lineNumber;
            _linePosition = linePosition;
        }

        public object? ObjectBeingDeserialized
        {
            get { return _o; }
        }

        public XmlElement Element
        {
            get { return _elem; }
        }

        public int LineNumber
        {
            get { return _lineNumber; }
        }

        public int LinePosition
        {
            get { return _linePosition; }
        }

        /// <summary>
        /// List of qnames of elements expected in the current context.
        /// </summary>
        public string ExpectedElements
        {
            get { return _qnames ?? string.Empty; }
        }
    }

    public delegate void XmlNodeEventHandler(object? sender, XmlNodeEventArgs e);


    public class XmlNodeEventArgs : EventArgs
    {
        private readonly object? _o;
        private readonly XmlNode _xmlNode;
        private readonly int _lineNumber;
        private readonly int _linePosition;


        internal XmlNodeEventArgs(XmlNode xmlNode, int lineNumber, int linePosition, object? o)
        {
            _o = o;
            _xmlNode = xmlNode;
            _lineNumber = lineNumber;
            _linePosition = linePosition;
        }

        public object? ObjectBeingDeserialized
        {
            get { return _o; }
        }

        public XmlNodeType NodeType
        {
            get { return _xmlNode.NodeType; }
        }

        public string Name
        {
            get { return _xmlNode.Name; }
        }

        public string LocalName
        {
            get { return _xmlNode.LocalName; }
        }

        public string NamespaceURI
        {
            get { return _xmlNode.NamespaceURI; }
        }

        public string? Text
        {
            get { return _xmlNode.Value; }
        }

        /// <summary>
        /// Gets the current line number.
        /// </summary>
        public int LineNumber
        {
            get { return _lineNumber; }
        }

        /// <summary>
        /// Gets the current line position.
        /// </summary>
        public int LinePosition
        {
            get { return _linePosition; }
        }
    }

    public delegate void UnreferencedObjectEventHandler(object? sender, UnreferencedObjectEventArgs e);

    public class UnreferencedObjectEventArgs : EventArgs
    {
        private readonly object? _o;
        private readonly string? _id;

        public UnreferencedObjectEventArgs(object? o, string? id)
        {
            _o = o;
            _id = id;
        }

        public object? UnreferencedObject
        {
            get { return _o; }
        }

        public string? UnreferencedId
        {
            get { return _id; }
        }
    }
}