using System;
using System.Collections.Generic;
using System.Net;
using System.Xml;
using S22.Xmpp;

namespace RhinoReminds
{

	public class Reminder : IEquatable<Reminder>
	{
		public int Id { get; }
		public string Jid => JidObj.ToString();
		public Jid JidObj { get; }
		public DateTime Time { get; private set; }
		public string Message { get; }

		public Reminder(int inId, Jid inJid, DateTime inTime, string inMessage)
		{
			Id = inId;
			JidObj = inJid.GetBareJid();
			Time = inTime;
			Message = inMessage;
		}

		public void TweakTime() {
			Time = Time.AddMilliseconds(1);
		}


		#region Overrides

		public override bool Equals(object obj) {
			if (!(obj is Reminder)) return false;
			Reminder otherReminder = obj as Reminder;
			return otherReminder.Id == Id &&
				otherReminder.JidObj == JidObj && // Will *always* be a bare Jid
				otherReminder.Time == Time &&
				otherReminder.Message == Message;
		}
		// For IEquatable<Reminder> implementation
		public bool Equals(Reminder otherReminder) => Equals((object)otherReminder);

		public override int GetHashCode() {
			int hashCode = -81903051;
			hashCode = (hashCode * -1521134295) + Id.GetHashCode();
			hashCode = (hashCode * -1521134295) + EqualityComparer<Jid>.Default.GetHashCode(JidObj);
			hashCode = (hashCode * -1521134295) + Time.GetHashCode();
			hashCode = (hashCode * -1521134295) + EqualityComparer<string>.Default.GetHashCode(Message);
			return hashCode;
		}
		public static bool operator ==(Reminder reminder1, Reminder reminder2) => EqualityComparer<Reminder>.Default.Equals(reminder1, reminder2);
		public static bool operator !=(Reminder reminder1, Reminder reminder2) => !(reminder1 == reminder2);

		public override string ToString() {
			return $"[Reminder Id={Id}, Jid={Jid}, Time={Time}, Message=\"{Message}\"]";
		}

		#endregion


		#region XML

		public void WriteToXml(XmlWriter xml)
		{
			xml.WriteStartElement("Reminder");

			xml.WriteElementString("Id", Id.ToString());
			xml.WriteElementString("Jid", Jid);
			xml.WriteElementString("Time", Time.ToString());
			xml.WriteElementString("Message", WebUtility.HtmlEncode(Message));

			xml.WriteEndElement();
		}

		public static Reminder FromXml(XmlNode xml)
		{
			int id = -1; string jid = string.Empty, message = string.Empty; DateTime dateTime = DateTime.Now;

			foreach (XmlNode subNode in xml.ChildNodes) {
				switch (subNode.Name) {
					case "Id":
						id = int.Parse(subNode.InnerText);
						break;
					case "Jid":
						jid = subNode.InnerText;
						break;
					case "Time":
						dateTime = DateTime.Parse(subNode.InnerText);
						break;
					case "Message":
						message = WebUtility.HtmlDecode(subNode.InnerText);
						break;
				}
			}

			return new Reminder(id, jid, dateTime, message);
		}

		#endregion


	}
}