using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Xml.Linq;
using FLocal.Core;
using FLocal.Core.DB;
using FLocal.Common;
using FLocal.Common.actions;

namespace FLocal.Common.dataobjects {
	public class Post : SqlObject<Post> {

		public class TableSpec : ISqlObjectTableSpec {
			public const string TABLE = "Posts";
			public const string FIELD_ID = "Id";
			public const string FIELD_POSTERID = "PosterId";
			public const string FIELD_POSTDATE = "PostDate";
			public const string FIELD_LASTCHANGEDATE = "LastChangeDate";
			public const string FIELD_REVISION = "Revision";
			public const string FIELD_LAYERID = "LayerId";
			public const string FIELD_TITLE = "Title";
			public const string FIELD_BODY = "Body";
			public const string FIELD_THREADID = "ThreadId";
			public const string FIELD_PARENTPOSTID = "ParentPostId";
			public static readonly TableSpec instance = new TableSpec();
			public string name { get { return TABLE; } }
			public string idName { get { return FIELD_ID; } }
			public void refreshSqlObject(int id) { Refresh(id); }
		}

		public class RevisionTableSpec : ISqlObjectTableSpec {
			public const string TABLE = "Revisions";
			public const string FIELD_ID = "Id";
			public const string FIELD_POSTID = "PostId";
			public const string FIELD_CHANGEDATE = "ChangeDate";
			public const string FIELD_TITLE = "Title";
			public const string FIELD_BODY = "Body";
			public const string FIELD_NUMBER = "Number";
			public static readonly RevisionTableSpec instance = new RevisionTableSpec();
			public string name { get { return TABLE; } }
			public string idName { get { return FIELD_ID; } }
			public void refreshSqlObject(int id) { }
		}

		protected override ISqlObjectTableSpec table { get { return TableSpec.instance; } }

		private int _posterId;
		public int posterId {
			get {
				this.LoadIfNotLoaded();
				return this._posterId;
			}
		}
		public User poster {
			get {
				this.LoadIfNotLoaded();
				return User.LoadById(this.posterId);
			}
		}

		private DateTime _postDate;
		public DateTime postDate {
			get {
				this.LoadIfNotLoaded();
				return this._postDate;
			}
		}

		private DateTime? _lastChangeDate;
		public DateTime? lastChangeDate {
			get {
				this.LoadIfNotLoaded();
				return this._lastChangeDate;
			}
		}

		private int _revision;
		public int revision {
			get {
				this.LoadIfNotLoaded();
				return this._revision;
			}
		}
		
		private int _layerId;
		public int layerId {
			get {
				this.LoadIfNotLoaded();
				return this._layerId;
			}
		}

		private string _title;
		public string title {
			get {
				this.LoadIfNotLoaded();
				return this._title;
			}
		}

		private string _body;
		public string body {
			get {
				this.LoadIfNotLoaded();
				return this._body;
			}
		}
		public string bodyShort {
			get {
				return this.body.Replace("<br />", Util.EOL).Substring(0, Math.Min(1000, this.body.IndexOf("<")));
			}
		}

		private int _threadId;
		public int threadId {
			get {
				this.LoadIfNotLoaded();
				return this._threadId;
			}
		}
		public Thread thread {
			get {
				return Thread.LoadById(this.threadId);
			}
		}

		private int? _parentPostId;
		public int? parentPostId {
			get {
				this.LoadIfNotLoaded();
				return this._parentPostId;
			}
		}
		public Post parentPost {
			get {
				return Post.LoadById(this.parentPostId.Value);
			}
		}

		protected override void doFromHash(Dictionary<string, string> data) {
			this._posterId = int.Parse(data[TableSpec.FIELD_POSTERID]);
			this._postDate = new DateTime(long.Parse(data[TableSpec.FIELD_POSTDATE]));
			this._lastChangeDate = Util.ParseDateTimeFromTimestamp(data[TableSpec.FIELD_LASTCHANGEDATE]);
			this._revision = int.Parse(data[TableSpec.FIELD_REVISION]);
			this._layerId = int.Parse(data[TableSpec.FIELD_LAYERID]);
			this._title = data[TableSpec.FIELD_TITLE];
			this._body = data[TableSpec.FIELD_BODY];
			this._threadId = int.Parse(data[TableSpec.FIELD_THREADID]);
			this._parentPostId = Util.ParseInt(data[TableSpec.FIELD_PARENTPOSTID]);
		}

		public XElement exportToXmlSimpleWithParent(UserContext context) {
			return new XElement("post",
				new XElement("id", this.id),
				new XElement("name", this.title),
				new XElement("parent", this.thread.exportToXmlSimpleWithParent(context))
			);
		}

		public XElement exportToXmlWithoutThread(UserContext context, bool includeParentPost, params XElement[] additional) {
			XElement result = new XElement("post",
				new XElement("id", this.id),
				new XElement("poster", this.poster.exportToXmlForViewing(context)),
				new XElement("postDate", this.postDate.ToXml()),
				new XElement("lastChangeDate", this.postDate.ToXml()),
				new XElement("revision", this.revision),
				new XElement("layerId", this.layerId),
				new XElement("title", this.title),
				new XElement("body", context.outputParams.preprocessBodyIntermediate(this.body)),
				new XElement("bodyShort", this.bodyShort),
				new XElement("threadId", this.threadId)
			);
			if(includeParentPost) {
				if(this.parentPostId.HasValue) {
					result.Add(new XElement("parentPost", this.parentPost.exportToXmlWithoutThread(context, false)));
				}
			}
			if(additional.Length > 0) {
				result.Add(additional);
			}
			return result;
		}

		public Post Reply(User poster, string title, string body, int desiredLayerId) {

			if(this.thread.isLocked) {
				throw new FLocalException("thread locked");
			}

			int actualLayerId = Math.Max(poster.getMinAllowedLayer(this.thread.board), desiredLayerId);
			AbstractChange postInsert = new InsertChange(
				TableSpec.instance,
				new Dictionary<string,AbstractFieldValue> {
					{ TableSpec.FIELD_THREADID, new ScalarFieldValue(this.thread.id.ToString()) },
					{ TableSpec.FIELD_PARENTPOSTID, new ScalarFieldValue(this.id.ToString()) },
					{ TableSpec.FIELD_POSTERID, new ScalarFieldValue(poster.id.ToString()) },
					{ TableSpec.FIELD_POSTDATE, new ScalarFieldValue(DateTime.Now.ToUTCString()) },
					{ TableSpec.FIELD_REVISION, new ScalarFieldValue("0") },
					{ TableSpec.FIELD_LASTCHANGEDATE, new ScalarFieldValue(DateTime.Now.ToUTCString()) },
					{ TableSpec.FIELD_LAYERID, new ScalarFieldValue(layerId.ToString()) },
					{ TableSpec.FIELD_TITLE, new ScalarFieldValue(title) },
					{ TableSpec.FIELD_BODY, new ScalarFieldValue(UBBParser.UBBToIntermediate(body)) },
				}
			);
			AbstractChange revisionInsert = new InsertChange(
				RevisionTableSpec.instance,
				new Dictionary<string,AbstractFieldValue> {
					{ RevisionTableSpec.FIELD_POSTID, new ReferenceFieldValue(postInsert) },
					{ RevisionTableSpec.FIELD_NUMBER, new ScalarFieldValue("0") },
					{ RevisionTableSpec.FIELD_CHANGEDATE, new ScalarFieldValue(DateTime.Now.ToUTCString()) },
					{ RevisionTableSpec.FIELD_TITLE, new ScalarFieldValue(title) },
					{ RevisionTableSpec.FIELD_BODY, new ScalarFieldValue(body) },
				}
			);
			AbstractChange threadUpdate = new UpdateChange(
				Thread.TableSpec.instance,
				new Dictionary<string,AbstractFieldValue> {
					{ Thread.TableSpec.FIELD_LASTPOSTDATE, new ScalarFieldValue(DateTime.Now.ToUTCString()) },
					{ Thread.TableSpec.FIELD_TOTALPOSTS, new IncrementFieldValue() },
					{
						Thread.TableSpec.FIELD_LASTPOSTID,
						new TwoWayReferenceFieldValue(
							postInsert,
							(oldStringId, newStringId) => {
								int oldId = int.Parse(oldStringId);
								int newId = int.Parse(newStringId);
								return Math.Max(oldId, newId).ToString();
							}
						)
					}
				},
				this.thread.id
			);
			AbstractChange userUpdate = new UpdateChange(
				User.TableSpec.instance,
				new Dictionary<string,AbstractFieldValue> {
					{ User.TableSpec.FIELD_TOTALPOSTS, new IncrementFieldValue() },
				},
				poster.id
			);
			List<AbstractChange> changes = new List<AbstractChange> {
				postInsert,
				revisionInsert,
				threadUpdate,
				userUpdate,
			};

			int? boardId = thread.boardId;
			do {
				Board board = Board.LoadById(boardId.Value);
				changes.Add(
					new UpdateChange(
						Board.TableSpec.instance,
						new Dictionary<string,AbstractFieldValue> {
							{ Board.TableSpec.FIELD_TOTALPOSTS, new IncrementFieldValue() },
							{
								Board.TableSpec.FIELD_LASTPOSTID,
								new TwoWayReferenceFieldValue(
									postInsert,
									(oldStringId, newStringId) => {
										int oldId = int.Parse(oldStringId);
										int newId = int.Parse(newStringId);
										return Math.Max(oldId, newId).ToString();
									}
								)
							}
						},
						board.id
					)
				);
				boardId = board.parentBoardId;
			} while(boardId.HasValue);

			ChangeSetUtil.ApplyChanges(changes.ToArray());
			
			return Post.LoadById(postInsert.getId().Value);
		}

	}
}