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

namespace ForumMongoDataBase.Implements
{
	public class CategoryStorage : ICategoryStorage
	{
		private readonly IMongoCollection<Category> _collection;
		public MongoClient context;

		public CategoryStorage()
		{
			context = ForumMongoDataBase.getInstance().client;
			_collection = context.GetDatabase("forum").GetCollection<Category>("categories");
		}

		public CategoryViewModel? Delete(CategoryBindingModel model)
		{
			var filter = Builders<Category>.Filter.Eq(c => c.Id, model.Id);
			var category = _collection.FindOneAndDelete(filter);

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

			return category.GetViewModel();
		}

		public CategoryViewModel? GetElement(CategorySearchModel model)
		{
			if (!model.Id.HasValue)
			{
				return null;
			}

			var category = _collection.Find(c => c.Id == model.Id.Value)
									   .FirstOrDefault();

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

			return category.GetViewModel();
		}

		public List<CategoryViewModel> GetFilteredList(CategorySearchModel model)
		{
			var filter = Builders<Category>.Filter.Empty;

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

			if (model.Name != null)
			{
				filter &= Builders<Category>.Filter.Eq(c => c.Name, model.Name);
			}

			var categories = _collection.Find(filter)
										 .ToList()
										 .Select(c => c.GetViewModel())
										 .ToList();

			return categories;
		}

		public List<CategoryViewModel> GetFullList()
		{
			var categories = _collection.Find(_ => true)
										 .ToList()
										 .Select(c => c.GetViewModel())
										 .ToList();

			return categories;
		}

		public CategoryViewModel? Insert(CategoryBindingModel model)
		{
			var category = Category.Create(model);

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

			_collection.InsertOne(category);

			return category.GetViewModel();
		}

		public CategoryViewModel? Update(CategoryBindingModel model)
		{
			var filter = Builders<Category>.Filter.Eq(c => c.Id, model.Id);
			var category = _collection.Find(filter).FirstOrDefault();

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

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

			return category.GetViewModel();
		}
	}
}