using ForumContracts.BindingModels;
using ForumContracts.SearchModels;
using ForumContracts.StorageContracts;
using ForumContracts.ViewModels;
using ForumDatabaseImplement.Models;
using MongoDB.Bson;
using MongoDB.Driver;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace ForumMongoDataBase.Implements
{
	public class UserStorage : IUserStorage
	{
		private readonly IMongoCollection<User> _collection;
		public MongoClient context;

		public UserStorage()
		{
			context = ForumMongoDataBase.getInstance().client;
			_collection = context.GetDatabase("forum").GetCollection<User>("users");
		}

		public UserViewModel? Delete(UserBindingModel model)
		{
			var filter = Builders<User>.Filter.Eq(u => u.Id, model.Id);
			var user = _collection.FindOneAndDelete(filter);

			if (user == null)
			{
				return null;
			}

			return user.GetViewModel();
		}

		public UserViewModel? GetElement(UserSearchModel model)
		{
			var filter = Builders<User>.Filter.Empty;

			if (model.Id.HasValue)
			{
				filter &= Builders<User>.Filter.Eq(u => u.Id, model.Id.Value);
			}

			if (!string.IsNullOrEmpty(model.Nickname) && !string.IsNullOrEmpty(model.Password))
			{
				filter &= Builders<User>.Filter.Eq(u => u.Nickname, model.Nickname)
					   & Builders<User>.Filter.Eq(u => u.Password, model.Password);
			}

			if (!string.IsNullOrEmpty(model.Email))
			{
				filter &= Builders<User>.Filter.Eq(u => u.Email, model.Email);
			}

			var user = _collection.Find(filter)
								   .FirstOrDefault();

			if (user == null)
			{
				return null;
			}

			return user.GetViewModel();
		}

		public List<UserViewModel> GetFilteredList(UserSearchModel model)
		{
			if (string.IsNullOrEmpty(model.Nickname))
			{
				return new List<UserViewModel>();
			}

			var filter = Builders<User>.Filter.Regex(u => u.Nickname, new BsonRegularExpression(model.Nickname, "i"));

			var users = _collection.Find(filter)
								   .ToList()
								   .Select(u => u.GetViewModel())
								   .ToList();

			return users;
		}

		public List<UserViewModel> GetFullList()
		{
			var users = _collection.Find(_ => true)
								   .ToList()
								   .Select(u => u.GetViewModel())
								   .ToList();

			return users;
		}

		public UserViewModel? Insert(UserBindingModel model)
		{
			var user = User.Create(model);

			if (user == null)
			{
				return null;
			}

			_collection.InsertOne(user);

			return user.GetViewModel();
		}

		public UserViewModel? Update(UserBindingModel model)
		{
			var filter = Builders<User>.Filter.Eq(u => u.Id, model.Id);
			var user = _collection.Find(filter).FirstOrDefault();

			if (user == null)
			{
				return null;
			}

			user.Update(model);
			_collection.ReplaceOne(filter, user);

			return user.GetViewModel();
		}
	}
}