using System.Globalization;

namespace Kit.Helpers
{
    using System;
    using System.Xml;
    using System.Linq;
    using System.Collections.Generic;

    public static class SystemXmlNodeExtensionMethods
    {
        private static readonly CultureInfo ci = new CultureInfo("en-US");

        public static void RemoveAttribute(this XmlDocument input, string name)
        {
            foreach (XmlNode item in input.SelectNodes("//*[@{0}]".ApplyFormat(name)))
            {
                item.Attributes.Remove(item.Attributes[name]);
            }
        }

        public static XmlNode SetElementValue(this XmlNode input,string name,string value)
        {
            var element = input.SelectSingleNode(name);
            if (element == null)
            {
                element = input.OwnerDocument.CreateElement(name);
                input.AppendChild(element);
            }
            element.InnerText = value;
            return element;
        }

        public static XmlNode SetElement(this XmlNode input, string name, Object value)
        {
            var element = input.SelectSingleNode(name);
            if (element == null)
            {
                element = input.OwnerDocument.CreateElement(name);
                input.AppendChild(element);
            }
            element.InnerText = value.ToString();
            return element;
        }


        public static XmlNode SetElementCDataValue(this XmlNode input, string name, string value)
        {
            var element = input.SelectSingleNode(name);
            if (element == null)
            {
                var root = input.OwnerDocument.CreateElement(name);
                element = input.OwnerDocument.CreateNode(XmlNodeType.CDATA, name, null);
                root.AppendChild(element);
                input.AppendChild(root);
            }
            element.InnerText = value;
            return element;
        }


        public static XmlNode SetElementValue(this XmlNode input, string name, decimal value)
        {
            return input.SetElementValue(name, value.ToString(System.Globalization.CultureInfo.InvariantCulture));
        }

        public static XmlNode SetElementValue(this XmlNode input, string name, decimal? value, string elementsAfterPostion)
        {
            if (value.HasValue)
            {
                return input.SetElementNullableValue(name, elementsAfterPostion, value.Value.ToString(System.Globalization.CultureInfo.InvariantCulture));
            }
            else
            {
                return input.SetElementNullableValue(name, null);
            }
        }

        public static XmlNode SetElementValue(this XmlNode input, string name, int? value, string elementsAfterPostion)
        {
            if (value.HasValue && value != 0)
            {
                return input.SetElementNullableValue(name, elementsAfterPostion, value.Value.ToString(System.Globalization.CultureInfo.InvariantCulture));
            }
            else
            {
                return input.SetElementNullableValue(name, null);
            }
        }

        private static XmlNode GetElementAfterInsert(XmlNode root, string elementsAfterPostion)
        {
            if (!elementsAfterPostion.IsNullOrEmpty())
            {
                var elements = root.SelectNodes(elementsAfterPostion);
                return elements.Cast<XmlNode>().LastOrDefault();
            }
            return null;
        }

        public static XmlNode SetElementNullableValue(this XmlNode input, string name,  string value)
        {
            return input.SetElementNullableValue(name, "", value);
        }

        public static XmlNode SetElementNullableValue(this XmlNode input, string name, string elementsAfterPostion, string value)
        {
            if (!value.IsNullOrEmpty())
            {
                var element = input.SelectSingleNode(name);
                if (element != null)
                {
                    input.RemoveChild(element);
                }

                    element = input.OwnerDocument.CreateElement(name);
                    var after = GetElementAfterInsert(input, elementsAfterPostion);
                    if (after == null) 
                        input.InsertBefore(element, input.FirstChild);
                    else
                        input.InsertAfter(element, after);

                element.InnerText = value;

                return element;
            }
            else
            {
                var child = input.SelectSingleNode(name);
                if (child != null)
                    input.RemoveChild(child);
                return null;
            }
        }

        public static XmlNode CreateElement(this XmlNode input, string name)
        {
            //var element = input.SelectSingleNode(name);
            //if (element == null)
            //{
                var element = input.OwnerDocument.CreateElement(name);
                input.AppendChild(element);
            //}
            return element;
        }

        public static XmlAttribute CreateAttributeValue(this XmlNode input, string name, string value)
        {
            XmlAttribute element;
            //try
            {
                element = input.Attributes[name];
            }
            //catch
            {

                if (element == null)
                {
                    element = input.OwnerDocument.CreateAttribute(name);
                    input.Attributes.Append(element);
                }
                element.InnerText = value;
            }
            return element;
        }

        public static void SetAttribute(this XmlNode input, string name, Object value)
        {
            XmlAttribute element = null;
            //try
            {
                element = input.Attributes[name];
            }
            //catch { }
            if (element == null)
            {
                element = input.OwnerDocument.CreateAttribute(name);
                input.Attributes.Append(element);
            }
            element.InnerText = value.ToString();
        }


        public static void SetAttributeValue(this XmlNode input, string name, string value)
        {
            XmlAttribute element = null;
            //try
            {
                element = input.Attributes[name];
            }
            //catch { }
            if (element == null)
            {
                element = input.OwnerDocument.CreateAttribute(name);
                input.Attributes.Append(element);
            }
            element.InnerText = value;
        }

         public static void SetAttributeValue(this XmlNode input, string name, Guid? value)
        {
            XmlAttribute element = null;
            //try
            {
                element = input.Attributes[name];
            }
            //catch { }
            if (element == null)
            {
                element = input.OwnerDocument.CreateAttribute(name);
                input.Attributes.Append(element);
            }
            element.InnerText = value.ToStringOrEmpty();
        }
        public static string GetValueAttribute(this XmlNode input, string name)
        {
            return input.GetValueAttribute(name, string.Empty);
        }

        public static string GetValueAttribute(this XmlNode input, string name, string empty)
        {
            XmlAttribute element = null;
            //try
            {
                if (input == null) return empty;
                element = input.Attributes[name];
                
                if (element != null)
                    return element.InnerText;
                else
                    return empty;
            }
            //catch
            //{
            //    return empty;
            //}
        }
        public static string GetValueAttribute(this XmlNode input, string name, string empty, XmlNamespaceManager namespaces)
        {
            XmlNode element = null;
            //try
            {
                if (input == null) return empty;
                element = input.SelectSingleNode(name, namespaces);
                
                if (element != null)
                    return element.InnerText;
                else
                    return empty;
            }
            //catch
            //{
            //    return empty;
            //}
        }
        public static string GetValue(this XmlNode input, string name)
        {
            return input.GetValue(name,String.Empty);
        }

        public static string GetValue(this XmlNode input, string name, string empty)
        {
            var element = input.SelectSingleNode(name);
            if (element == null) return empty;
            return element.InnerText;
        }

        public static string GetValue(this XmlNode input, string name, XmlNamespaceManager namespaces)
        {
            return input.GetValue(name, String.Empty, namespaces);
        }

        public static string GetValue(this XmlNode input, string name, string empty, XmlNamespaceManager namespaces)
        {
            var element = input.SelectSingleNode(name, namespaces);
            if (element == null) return empty;
            return element.InnerText;
        }

        public static string GetValueCData(this XmlNode input, string name)
        {
            return input.GetValueCData(name, string.Empty);
        }

        public static string GetValueCData(this XmlNode input, string name, string empty)
        {
            var element = input.SelectSingleNode(name);
            if (element == null) return empty;
            if (element.FirstChild == null) return element.InnerText;
            return element.FirstChild.InnerText;
        }

        public static DateTime? GetValueDate(this XmlNode input, string name)
        {
            return input.GetValue(name, String.Empty).TryParseToDateXMLNullable();
        }

        public static DateTime GetValueDate(this XmlNode input, string name,DateTime empty)
        {
            return input.GetValue(name, String.Empty).TryParseToDateXMLNullable(empty);
        }

        public static short GetValueShort(this XmlNode input, string name)
        {
            return input.GetValue(name, String.Empty).TryParseToShort();
        }

        public static bool GetValueBool(this XmlNode input, string name)
        {
            return input.GetValue(name, String.Empty).TryParseToBool(false);
        }
        public static bool GetValueBool(this XmlNode input, string name, bool empty)
        {
            return input.GetValue(name, String.Empty).TryParseToBool(empty);
        }
        public static Int32? GetValueInt32Nulable(this XmlNode input, string name)
        {
            return input.GetValue(name, String.Empty).TryParseToInt32Nulable();
        }

        public static Int32 GetValueInt32(this XmlNode input, string name)
        {
            return input.GetValue(name, String.Empty).TryParseToInt32();
        }
        public static Int32 GetValueInt32(this XmlNode input, string name, int empty)
        {
            return input.GetValue(name, String.Empty).TryParseToInt32(empty);
        }
        public static byte GetValueByte(this XmlNode input, string name, byte empty)
        {
            return input.GetValue(name, String.Empty).TryParseToByte(empty);
        }
        public static decimal? GetValueDecimal(this XmlNode input, string name)
        {
            return input.GetValue(name, String.Empty).TryParseToDecimalNulable();
        }
        public static decimal GetValueDecimal(this XmlNode input, string name, decimal empty)
        {
            return input.GetValue(name, String.Empty).TryParseToDecimal(empty);
        }
        public static Guid GetValueGuid(this XmlNode input, string name, Guid empty)
        {
            return input.GetValue(name, String.Empty).TryParseToGuid(empty);
        }

        public static Guid GetValueGuid(this XmlNode input, string name)
        {
            return input.GetValue(name, String.Empty).TryParseToGuid(Guid.Empty);
        }
        public static Guid? GetValueGuidNullable(this XmlNode input, string name)
        {
            return input.GetValue(name, String.Empty).TryParseToGuidNulable(null);
        }

        public static Guid GetValueAttributeGuid(this XmlNode input, string name)
        {
            return input.GetValueAttributeGuid(name,null) ?? Guid.Empty;
        }

        public static Guid? GetValueAttributeGuid(this XmlNode input, string name, Guid? empty)
        {
            return input.GetValueAttribute(name, String.Empty).TryParseToGuidNulable(empty);
        }

        public static Guid? GetValueAttributeGuid(this XmlNode input, string name, XmlNamespaceManager namespaces, Guid? empty )
        {
            return input.GetValueAttribute(name, String.Empty).TryParseToGuidNulable(empty);
        }


        public static int GetValueAttributeInt32(this XmlNode input, string name)
        {
            return input.GetValueAttribute(name, String.Empty).TryParseToInt32(0);
        }

        public static int? GetValueAttributeInt32Nullable(this XmlNode input, string name)
        {
            return input.GetValueAttribute(name, String.Empty).TryParseToInt32Nulable();
        }

        public static bool GetValueAttributeBool(this XmlNode input, string name)
        {
            return input.GetValueAttribute(name, String.Empty).TryParseToBool(false);
        }
        public static bool GetValueAttributeBool(this XmlNode input, string name, bool empty)
        {
            return input.GetValueAttribute(name, String.Empty).TryParseToBool(empty);
        }


        public static string ToStringXMLShema(this DateTime dt)
        {
            if (dt == null) return String.Empty;
            return dt.ToString("yyyy-MM-ddTHH:mm:ss");
        }

        public static string ToStringXMLShema(this DateTime? dt)
        {
            if (dt == null) return String.Empty;
            return (dt ?? DateTime.UtcNow).ToString("yyyy-MM-ddTHH:mm:ss");
        }

        public static string ToStringSoutXML(this DateTime dt)
        {
            if (dt == null) return String.Empty;
            return dt.ToString("yyyy-MM-dd");
        }

        public static string ToStringSoutXML(this DateTime? dt)
        {
            if (dt == null) return String.Empty;
            return (dt??DateTime.UtcNow).ToString("yyyy-MM-dd");
        }

        public static double GetValueDouble_(this XmlNode input, string name)
        {
            double value;
            if (double.TryParse(input.GetValue(name), NumberStyles.Any, ci.NumberFormat, out value))
                return value;
            return double.MinValue;
        }
        public static double GetValueDouble_(this XmlNode input)
        {
            double value;
            if (double.TryParse(input.InnerText, NumberStyles.Any, ci.NumberFormat, out value))
                return value;
            return double.MinValue;
        }
        public static void ForEach(this XmlNodeList nodeList, Action<XmlNode> action)
        {
            foreach(XmlNode node in nodeList)
            {
                action(node);
            }
        }
        public static IEnumerable<XmlNode> ToList<TResult>(this XmlNodeList nodeList)
        {
            var resultList = new List<XmlNode>();
            foreach (XmlNode node in nodeList)
            {
                resultList.Add(node);
            }
            return resultList;
        }
        public static IEnumerable<TResult> Select<TResult>(this XmlNodeList nodeList, Func<XmlNode, TResult> action)
        {
            var resultList = new List<TResult>();
            foreach (XmlNode node in nodeList)
            {
                resultList.Add(action(node));
            }
            return resultList;
        }
    }
}