using EnVisage.Models;
using System;
using System.Collections.Generic;
using System.Data.Entity;
using System.Linq;
using System.Threading.Tasks;
using Prevu.Core.Audit.Model;
using static EnVisage.Code.AuditProxy;

namespace EnVisage.Code.BLL
{
	public class NoteManager : ManagerBase<Note, NoteModel>
	{
		public NoteManager() : base(null)
		{

		}

		public NoteManager(EnVisageEntities dbContext) : base(dbContext)
		{

		}

		protected override Note InitInstance()
		{
			return new Note { Id = Guid.NewGuid() };
		}

		protected override Note RetrieveReadOnlyById(Guid key)
		{
			return DataTable.AsNoTracking().FirstOrDefault(t => t.Id == key);
		}

		public override DbSet<Note> DataTable => DbContext.Notes;

		public override Note Save(NoteModel model)
		{
			var isNew = false;
			Note oldNote = null;
			if (model == null)
				throw new ArgumentNullException(nameof(model));

			#region Save Rate data
			Note dbObj = null;
			if (model.Id != Guid.Empty)
			{
				dbObj = DataTable.Find(model.Id);
			}
			if (dbObj == null)
			{
				isNew = true;
				dbObj = InitInstance();
			}

			if (isNew)
			{
				model.CopyTo(dbObj);
				DataTable.Add(dbObj);
			}
			else
			{
				oldNote = Load(dbObj.Id);
				model.CopyTo(dbObj);
				DbContext.Entry(dbObj).State = EntityState.Modified;
			}

			#endregion

			if (IsContextLocal)
			{
				DbContext.SaveChanges();
				LogNoteEvents(dbObj, oldNote, null, null);
			}
			return dbObj;
		}

		public void MoveNotesDomain(Guid oldDomainId, Guid newDomainId)
		{
			var notes = DataTable.Where(x => x.DomainId == oldDomainId).ToList();
			foreach (var note in notes)
			{
				note.DomainId = newDomainId;
				DbContext.Entry(note).State = EntityState.Modified;
			}
			if (IsContextLocal)
				DbContext.SaveChanges();
		}
		public void CloneNotesDomain(Guid oldDomainId, Guid newDomainId)
		{
			var notes = DbContext.Notes.Where(x => x.DomainId == oldDomainId).ToList();
			var notesForSave = new List<Note>();
			foreach (var n in notes)
			{
				var note = new Note
				{
					Id = Guid.NewGuid(),
					ParentId = n.ParentId,
					DomainId = newDomainId,
					DateAdded = DateTime.Now,
					NoteDetail = n.NoteDetail,
					NoteType = n.NoteType,
					Title = n.Title,
					SystemAttributeId = n.SystemAttributeId,
					UserId = n.UserId
				};
				notesForSave.Add(note);
			}
			DataTable.AddRange(notesForSave);
			if (IsContextLocal)
			{
				DbContext.SaveChanges();
				LogNotesCreateEvents(notesForSave, null, null);
			}

		}
		public void RemoveNotesForDomain(Guid domainId)
		{
			var notes = DataTable.Where(x => x.DomainId == domainId).ToList();
			foreach (var n in notes)
			{
				DbContext.Notes.Remove(n);
			}
			if (IsContextLocal)
			{
				DbContext.SaveChanges();
				LogNotesDeleteEvent(notes, null, null);
			}


		}
		public void RemoveNotes(Guid domainId, Guid parentId)
		{
			var notes = DataTable.Where(x => x.DomainId == domainId && x.ParentId == parentId).ToList();
			foreach (var n in notes)
			{
				DbContext.Notes.Remove(n);
			}
			if (IsContextLocal)
			{
				DbContext.SaveChanges();
				LogNotesDeleteEvent(notes, null, null);
			}

		}
		public void RemoveNotesForParent(Guid parentId)
		{
			var notes = DbContext.Notes.Where(x => x.ParentId == parentId).ToList();
			foreach (var n in notes)
			{
				DbContext.Notes.Remove(n);
			}
			if (IsContextLocal)
			{
				DbContext.SaveChanges();
				LogNotesDeleteEvent(notes, null, null);
			}
		}
		public void CloneNotesParent(Guid oldParentId, Guid newParentId)
		{
			var notes = DbContext.Notes.Where(x => x.ParentId == oldParentId).ToList();
			var notesForSave = new List<Note>();
			foreach (var n in notes)
			{
				var note = new Note
				{
					Id = Guid.NewGuid(),
					ParentId = newParentId,
					DomainId = n.DomainId,
					DateAdded = DateTime.Now,
					NoteDetail = n.NoteDetail,
					NoteType = n.NoteType,
					Title = n.Title,
					SystemAttributeId = n.SystemAttributeId,
					UserId = n.UserId
				};
				notesForSave.Add(note);
			}
			if (IsContextLocal)
			{
				DbContext.SaveChanges();
				LogNotesCreateEvents(notesForSave, null, null);
			}

		}
		public void MoveNotesParent(Guid oldParentId, Guid newParent)
		{
			var notes = DataTable.Where(x => x.ParentId == oldParentId).ToList();

			foreach (var note in notes)
			{
				note.ParentId = newParent;
				DbContext.Entry(note).State = EntityState.Modified;
			}
			if (IsContextLocal)
				DbContext.SaveChanges();
			//todo: add log event ?
		}

		public void Delete(Guid id)
		{

			Note dbObj = Load(id, false);
			if (dbObj != null)
				DbContext.Notes.Remove(dbObj);
			if (IsContextLocal)
			{
				DbContext.SaveChanges();
				LogNoteEvents(null, dbObj, null, null);
			}


		}
		public List<NoteModel> GetNotes(Guid? domainId, Guid parentId, int t, bool withChildren)
		{
			List<NoteModel> noteModelList = new List<NoteModel>();
			var notes = DataTable.Where(x => x.NoteType == t && x.ParentId == parentId &&
											 (domainId.HasValue && domainId.Value != Guid.Empty
												 ? x.DomainId == domainId
												 : !x.DomainId.HasValue));
			var authorIds = notes.Where(p => p.UserId.HasValue).Select(p => p.UserId.ToString()).Distinct().ToList();
			var authors = DbContext.AspNetUsers.Where(p => authorIds.Contains(p.Id)).ToDictionary(p => p.Id);

			foreach (var n in notes)
			{
				noteModelList.Add(new NoteModel
				{
					Id = n.Id,
					Author = n.UserId.HasValue && authors.ContainsKey(n.UserId.Value.ToString()) ? authors[n.UserId.Value.ToString()] : null,
					//child notes will tie directly to the note id of the parent and will not need domain id filled in
					ChildNotes = withChildren ? GetNotes(null, n.Id, t, true) : new List<NoteModel>(),
					DateAdded = n.DateAdded ?? DateTime.Now,
					Title = n.Title,
					ParentId = n.ParentId,
					Details = n.NoteDetail,
					DomainId = n.DomainId,
					NoteType = n.NoteType ?? -1
				});
			}
			return noteModelList;
		}

		#region Log Methods

		private readonly Func<Note, string> _noteValue = r => $"{r.Title} <br /> {r.NoteDetail}";

		public void LogNotesDeleteEvent(IEnumerable<Note> notes, string userId, string transactionId)
		{
			transactionId = Utils.GetOrCreateTransactionId(DbContext, transactionId);
			foreach (var rate in notes)
			{
				LogNoteEvents(null, rate, userId, transactionId);
			}
		}

		public void LogNotesCreateEvents(IEnumerable<Note> notes, string userId, string transactionId)
		{
			transactionId = Utils.GetOrCreateTransactionId(DbContext, transactionId);
			foreach (var rate in notes)
			{
				LogNoteEvents(rate, null, userId, transactionId);
			}
		}

		public void LogNoteEvents(Note note, Note oldNote, string userId, string transactionId)
		{
			EventRequestBaseModel eventTosave = null;
			transactionId = Utils.GetOrCreateTransactionId(DbContext, transactionId);

			if (string.IsNullOrEmpty(userId))
				userId = SecurityManager.GetUserPrincipal().ToString();

			// Note for Scenario
			if ((note != null && note.NoteType == NoteType.Scenario.GetHashCode()) ||
				(oldNote != null && oldNote.NoteType == NoteType.Scenario.GetHashCode()))
			{
				eventTosave = GetEventForScenarioNote(note, oldNote, userId);
			}

			// Note for Project
			if ((note != null && note.NoteType == NoteType.Project.GetHashCode()) ||
				(oldNote != null && oldNote.NoteType == NoteType.Project.GetHashCode()))
			{
				eventTosave = GetEventForProjectNote(note, oldNote, userId);
			}

			// Note for row in Scenario Details Grid
			if ((note != null && note.NoteType == NoteType.ExpenditureCategory.GetHashCode()) ||
				(oldNote != null && oldNote.NoteType == NoteType.ExpenditureCategory.GetHashCode()))
			{
				eventTosave = GetEventForExpenditureCategoryNote(note, oldNote, userId);
			}

			if (eventTosave != null)
			{
				LogEvent(transactionId, eventTosave);
				Task.Run(() => CommitEventChanges(transactionId));
			}
		}

		protected EventRequestBaseModel GetEventForScenarioNote(Note note, Note oldNote, string userId)
		{
			EventRequestBaseModel result = null;
			Guid? scenarioId = null;
			Guid? projectId = null;
			var parentid = note?.ParentId ?? oldNote?.ParentId;

			if (parentid != Guid.Empty)
			{
				Scenario scenario;
				using (var scenarioManager = new ScenarioManager(DbContext))
				{
					scenario = scenarioManager.Load(parentid);
				}
				if (scenario != null)
				{
					scenarioId = scenario.Id;
					projectId = scenario.ParentId;
				}
			}

			if (note != null && oldNote == null)
			{
				#region Note Created
			
				result = new EventRequestBaseModel
				{
					EntityId = note.Id,
					ProjectId = projectId,
					ScenarioId = scenarioId,
					ClassificationKey = "ScenarioNoteAdd",
					NewValue = _noteValue(note),
					UserId = userId
				};

				#endregion
			}
			if (oldNote != null)
			{
				if (note != null)
					result = new EventRequestBaseModel
					{
						EntityId = note.Id,
						ProjectId = projectId,
						ScenarioId = scenarioId,
						ClassificationKey = "ScenarioNoteEdit",
						UserId = userId,
						NewValue = _noteValue(note),
						OldValue = _noteValue(oldNote)
					};
				else
					result = new EventRequestBaseModel
					{
						EntityId = oldNote.Id,
						ProjectId = projectId,
						ScenarioId = scenarioId,
						ClassificationKey = "ScenarioNoteDelete",
						UserId = userId,
						OldValue = _noteValue(oldNote)
					};
			}

			return result;
		}

		protected EventRequestBaseModel GetEventForProjectNote(Note note, Note oldNote, string userId)
		{
			EventRequestBaseModel result = null;
			Guid? projectId = null;
			var parentid = note?.ParentId ?? oldNote?.ParentId;

			if (parentid != Guid.Empty)
				projectId = parentid;

			if (note != null && oldNote == null)
			{
				#region Note Created

				result = new EventRequestBaseModel
				{
					EntityId = note.Id,
					ProjectId = projectId,
					ClassificationKey = "ProjectNotesAdd",
					NewValue = _noteValue(note),
					UserId = userId
				};

				#endregion
			}
			if (oldNote != null)
			{
				if (note != null)
					result = new EventRequestBaseModel
					{
						EntityId = note.Id,
						ProjectId = projectId,
						ClassificationKey = "ProjectNotesChange",
						UserId = userId,
						NewValue = _noteValue(note),
						OldValue = _noteValue(oldNote)
					};
				else
					result = new EventRequestBaseModel
					{
						EntityId = oldNote.Id,
						ProjectId = projectId,
						ClassificationKey = "ProjectNotesDelete",
						UserId = userId,
						OldValue = _noteValue(oldNote)
					};
			}

			return result;
		}

		protected EventRequestBaseModel GetEventForExpenditureCategoryNote(Note note, Note oldNote, string userId)
		{
			EventRequestBaseModel result = null;
			Guid? scenarioId = null;
			Guid? projectId = null;

			var parentid = note?.DomainId ?? oldNote?.DomainId;
			var expCatId = note?.ParentId ?? oldNote?.ParentId;
			var expCatName = String.Empty;

			// Get related Scenario and Project
			if (parentid.HasValue && (parentid.Value != Guid.Empty))
			{
				Scenario scenario;
				using (var scenarioManager = new ScenarioManager(DbContext))
				{
					scenario = scenarioManager.Load(parentid);
				}
				if (scenario != null)
				{
					scenarioId = scenario.Id;
					projectId = scenario.ParentId;
				}
			}

			// Get parent EC Name
			if (expCatId.HasValue && expCatId.Value != Guid.Empty)
			{
				using (var expCatMngr = new ExpenditureCategoryManager(DbContext))
				{
					var expCatInfo = expCatMngr.GetExpenditureDetails(expCatId.Value);
					expCatName = expCatInfo != null ? expCatInfo.ExpenditureCategoryName : String.Empty;
				}
			}

			if (note != null && oldNote == null)
			{
				#region Note Created

				result = new EventRequestBaseModel
				{
					EntityId = note.Id,
					ProjectId = projectId,
					ScenarioId = scenarioId,
					ClassificationKey = "ScenarioDetailsNoteAdd",
					NewValue = _noteValue(note),
					UserId = userId,
					Comment = $"Expenditure Category: '{expCatName}'"
				};

				#endregion
			}
			if (oldNote != null)
			{

				if (note != null)
					result = new EventRequestBaseModel
					{
						EntityId = note.Id,
						ProjectId = projectId,
						ScenarioId = scenarioId,
						ClassificationKey = "ScenarioDetailsNoteEdit",
						UserId = userId,
						NewValue = _noteValue(note),
						OldValue = _noteValue(oldNote),
						Comment = $"Expenditure Category: '{expCatName}'"
					};
				else
					result = new EventRequestBaseModel
					{
						EntityId = oldNote.Id,
						ProjectId = projectId,
						ScenarioId = scenarioId,
						ClassificationKey = "ScenarioDetailsNoteDelete",
						UserId = userId,
						OldValue = _noteValue(oldNote),
						Comment = $"Expenditure Category: '{expCatName}'"
					};
			}

			return result;
		}

		#endregion

	}



}