/*
 * XmlSerializeWithDescription.cs
 * Copyright (c) 2009 kbinani
 *
 * This file is part of Boare.Lib.AppUtil.
 *
 * Boare.Lib.AppUtil is free software; you can redistribute it and/or
 * modify it under the terms of the BSD License.
 *
 * Boare.Lib.AppUtil 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.
 */
using System;
using System.Collections.Generic;
using System.Text;
using System.Xml;
using System.Reflection;
using System.IO;

namespace Boare.Lib.AppUtil {

    /// <summary>
    /// フィールド、またはプロパティの概要を格納するattribute
    /// </summary>
    [AttributeUsage( AttributeTargets.Field | AttributeTargets.Property, AllowMultiple = false )]
    public class XmlItemDescription : Attribute {
        private string m_value = "";
        private string m_attribute_name = "description";

        public XmlItemDescription( string Value ) {
            m_value = Value;
        }

        public XmlItemDescription( string AttributeName, string Value ) {
            m_value = Value;
            m_attribute_name = AttributeName;
        }

        public string AttributeName {
            get {
                return m_attribute_name;
            }
        }

        public string Value {
            get {
                return m_value;
            }
        }
    }

    /// <summary>
    /// フィールドおよびプロパティを、XmlItemDescription属性の文字列を付加しながらXmlシリアライズする
    /// </summary>
    public class XmlSerializeWithDescription {
        private XmlTextWriter m_writer;
        private Type m_type;

        public XmlSerializeWithDescription() {
        }

        public void Serialize( Stream stream, object obj ) {
            m_writer = new XmlTextWriter( stream, null );
            m_writer.Formatting = Formatting.Indented;
            m_writer.Indentation = 4;
            m_writer.IndentChar = ' ';
            m_writer.WriteStartDocument();
            m_writer.WriteStartElement( obj.GetType().Name );
            PrintItemRecurse( obj );
            m_writer.WriteEndElement();
            m_writer.WriteEndDocument();
            m_writer.Flush();
        }

        private void PrintItemRecurse( object obj ) {
            Type t = obj.GetType();
            if ( !TryWriteValueType( obj ) ){
                if ( t.IsGenericType ) {
                    List<int> f = new List<int>();
                    Type list_type = f.GetType().GetGenericTypeDefinition();
                    if ( t.GetGenericTypeDefinition().Equals( list_type ) ) {
                        Type[] gen = t.GetGenericArguments();
                        if ( gen.Length == 1 ) {
                            PropertyInfo count_property = t.GetProperty( "Count", typeof( int ) );
                            int count = (int)count_property.GetValue( obj, new object[] { } );
                            Type returntype = gen[0];
                            MethodInfo indexer = t.GetMethod( "get_Item", new Type[] { typeof( int ) } );
                            string name = "";
                            if ( returntype.Equals( typeof( Boolean ) ) ) {
                                name = "boolean";
                            } else if ( returntype.Equals( typeof( DateTime ) ) ) {
                                name = "dateTime";
                            } else if ( returntype.Equals( typeof( Decimal ) ) ) {
                                name = "decimal";
                            } else if ( returntype.Equals( typeof( Double ) ) ) {
                                name = "double";
                            } else if ( returntype.Equals( typeof( Int32 ) ) ) {
                                name = "int";
                            } else if ( returntype.Equals( typeof( Int64 ) ) ) {
                                name = "long";
                            } else if ( returntype.Equals( typeof( Single ) ) ) {
                                name = "float";
                            } else if ( returntype.Equals( typeof( String ) ) ) {
                                name = "string";
                            } else if ( returntype.IsEnum ) {
                                name = returntype.Name;
                            }
                            if ( indexer != null && name != "" ) {
                                for ( int i = 0; i < count; i++ ) {
                                    object value = indexer.Invoke( obj, new object[] { i } );
                                    m_writer.WriteStartElement( name );
                                    TryWriteValueType( value );
                                    m_writer.WriteEndElement();
                                }
                            }
                        }
                    }
                } else {
                    foreach ( FieldInfo fi in t.GetFields() ) {
                        if ( fi.IsPrivate || fi.IsStatic ) {
                            continue;
                        }
                        object[] attr = fi.GetCustomAttributes( typeof( XmlItemDescription ), false );
                        XmlItemDescription xid = null;
                        if ( attr.Length > 0 ) {
                            xid = (XmlItemDescription)attr[0];
                        }
                        WriteContents( fi.Name, fi.GetValue( obj ), xid );
                    }
                    foreach ( PropertyInfo pi in t.GetProperties() ) {
                        if ( !pi.CanRead | !pi.CanWrite ) {
                            continue;
                        }
                        if ( !pi.GetSetMethod().IsPublic | !pi.GetGetMethod().IsPublic ) {
                            continue;
                        }
                        if ( pi.GetSetMethod().IsStatic | pi.GetGetMethod().IsStatic ) {
                            continue;
                        }
                        object[] attr = pi.GetCustomAttributes( typeof( XmlItemDescription ), false );
                        XmlItemDescription xid = null;
                        if ( attr.Length > 0 ) {
                            xid = (XmlItemDescription)attr[0];
                        }
                        WriteContents( pi.Name, pi.GetValue( obj, new object[] { } ), xid );
                    }
                }
            }
        }

        private bool TryWriteValueType( object obj ) {
            Type t = obj.GetType();
            if ( t.Equals( typeof( Boolean ) ) ) {
                m_writer.WriteValue( (Boolean)obj );
                return true;
            } else if ( t.Equals( typeof( DateTime ) ) ) {
                m_writer.WriteValue( (DateTime)obj );
                return true;
            } else if ( t.Equals( typeof( Decimal ) ) ) {
                m_writer.WriteValue( (Decimal)obj );
                return true;
            } else if ( t.Equals( typeof( Double ) ) ) {
                m_writer.WriteValue( (Double)obj );
                return true;
            } else if ( t.Equals( typeof( Int32 ) ) ) {
                m_writer.WriteValue( (Int32)obj );
                return true;
            } else if ( t.Equals( typeof( Int64 ) ) ) {
                m_writer.WriteValue( (Int64)obj );
                return true;
            } else if ( t.Equals( typeof( Single ) ) ) {
                m_writer.WriteValue( (Single)obj );
                return true;
            } else if ( t.Equals( typeof( String ) ) ) {
                m_writer.WriteString( (String)obj );
                return true;
            } else if ( t.IsEnum ) {
                string val = Enum.GetName( t, obj );
                m_writer.WriteString( val );
                return true;
            } else {
                return false;
            }
        }

        private void WriteContents( string name, object next_obj, XmlItemDescription xid ) {
            m_writer.WriteStartElement( name );
            if ( xid != null ) {
                m_writer.WriteAttributeString( xid.AttributeName, xid.Value );
            }
            PrintItemRecurse( next_obj );
            m_writer.WriteEndElement();
        }

        private void test() {
            System.Xml.Serialization.XmlSerializer xs = new System.Xml.Serialization.XmlSerializer( typeof( int ) );
        }

    }

}