using Sarand.Net.Standard.Base.App;
using Sarand.Net.Standard.Base.Bus;
using Sarand.Net.Standard.Base.Core;
using Sarand.Net.Standard.Base.Utils;
using Saxonite.Net.Standard.Base.App;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Xml.Linq;

namespace Saxonite.Net.Standard.Base.Bus
{
	//=======================================================================
	// Contact data - associated with Organisations, Users etc.
	//=======================================================================
	public class SaxContactData
	{
		//-------------------------------------------------------------------
		// Definitions.
		private static readonly String ElementName_ContactMethods = "contactMethods";
		private static readonly String ElementName_ContactMethod = "contactMethod";
		private static readonly String AttributeName_Method = "method";

		//-------------------------------------------------------------------
		// Data members.
		private class ContactMethodData
		{
			public Sax.ContactMethod Method { get; set; }
			public String Value { get; set; }
		}
		private Dictionary<Sax.ContactMethod, ContactMethodData> contactMethods { get; } = new Dictionary<Sax.ContactMethod, ContactMethodData>();

		//-------------------------------------------------------------------
		// Construction - from serialised data.
		public SaxContactData(String contactData = "")
		{
			ExtractContactData(contactData);
		}

		//-------------------------------------------------------------------
		// Properties.
		public List<Sax.ContactMethod> Methods { get { return contactMethods.Keys.ToList(); } }

		//-------------------------------------------------------------------
		// Contact Methods.
		//-------------------------------------------------------------------
		/// <summary>Extract the value associated with the specified method.</summary>
		public String GetContactMethodValue(Sax.ContactMethod method)
		{
			return contactMethods.GetValueOrDefault(method, new ContactMethodData()).Value;
		}

		/// <summary>Set the value associated with the specified method.</summary>
		public bool SetContactMethodValue(Sax.ContactMethod method, String value)
		{
			if ((int)method < 1 || value.IsEmpty()) return false;
			ContactMethodData contactMethod = contactMethods.GetValueOrDefault(method, null);
			if (contactMethod == null)
				contactMethods.Add(method, contactMethod = new ContactMethodData() { Method = method });
			contactMethod.Value = value;
			return true;
		}

		/// <summary>Clear the value associated with the specified method.</summary>
		public bool ClearContactMethod(Sax.ContactMethod method)
		{
			return contactMethods.Remove(method);
		}

		/// <summary>Clear all contact methods.</summary>
		public void ClearContactMethods()
		{
			contactMethods.Clear();
		}

		//-------------------------------------------------------------------
		// Serialisation.
		//-------------------------------------------------------------------
		/// <summary>
		/// Extract contact methods from serialised data.
		/// </summary>
		private void ExtractContactData(String contactData)
		{
			contactMethods.Clear();
			if (StringUtil.IsEmpty(contactData)) return;

			try
			{
				// Load XML data.
				XDocument doc = XDocument.Parse(contactData);
				XElement rootElement = doc.Root;
				foreach (XElement rootChildElement in rootElement.GetChildElements())
				{
					String rootChildElementName = rootChildElement.GetLocalName();
					if (rootChildElementName.EqualsCI(ElementName_ContactMethod))
					{
						// Contact Method.
						String methodValue = rootChildElement.GetAttributeValue(AttributeName_Method);
						Sax.ContactMethod method = EnumUtil.ParseEnum(methodValue, Sax.ContactMethod.Unknown);
						if (method != Sax.ContactMethod.Unknown)
						{
							ContactMethodData contactMethod = new ContactMethodData()
							{
								Method = method,
								Value = rootChildElement.Value
							};
							contactMethods.Add(method, contactMethod);
						}
						else SaLogger.Warn($"{SysUtil.Fn} Unrecognised contact method: " + methodValue);
					}
					else SaLogger.Warn($"{SysUtil.Fn} Unexpected 'Root' child element: " + rootChildElementName);
				}
			}
			catch (Exception exc)
			{
				SaLogger.Warn($"{SysUtil.Fn} " + ExceptionUtil.GetLogMessage(exc));
			}
		}

		//-------------------------------------------------------------------
		/// <summary>
		/// Convert to serialised data.
		/// </summary>
		public String GetContactData()
		{
			try
			{
				XDocument doc = new XDocument();
				XElement contactMethodsElement = doc.AppendElement(ElementName_ContactMethods);
				foreach (ContactMethodData contactMethod in contactMethods.Values)
				{
					if ((int)contactMethod.Method < 1 || contactMethod.Value.IsEmpty()) continue;
					XElement contactMethodElement = contactMethodsElement.AppendElement(ElementName_ContactMethod, contactMethod.Value);
					contactMethodElement.SetAttribute(AttributeName_Method, contactMethod.Method.ToString());
				}
				return doc.GetXml();
			}
			catch (Exception exc)
			{
				SaLogger.Warn($"{SysUtil.Fn} " + ExceptionUtil.GetLogMessage(exc));
			}
			return "";
		}

		//-------------------------------------------------------------------
	}
	//=======================================================================
}