using Microsoft.EntityFrameworkCore;
using Npgsql;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Runtime.CompilerServices;
using System.Text;
using System.Threading.Tasks;
using TaskTrackerContracts.BindingModels;
using TaskTrackerContracts.SearchModels;
using TaskTrackerContracts.StoragesContracts;
using TaskTrackerContracts.ViewModels;
using TaskTrackerModels.Models;

namespace TaskTrackerDatabaseImplement.Implements
{
	public class TaskAssigmentStorage : ITaskAssigmentStorage
	{
		public TaskAssigmentViewModel? Delete(TaskAssigmentBindingModel model)
		{
			using var context = new TasktrackerContext();
			var element = context.TaskAssigments.Include(x => x.Task).Include(x => x.Employee)
			.FirstOrDefault(rec => rec.TaskId == model.TaskId && rec.EmployeeId == model.EmployeeId);
			if (element != null)
			{
				context.TaskAssigments.Remove(element);
				context.SaveChanges();
				return element.GetViewModel;
			}
			return null;
		}

		public TaskAssigmentViewModel? GetElement(TaskAssigmentSearchModel model)
		{
			if (!model.EmployeeId.HasValue || !model.TaskId.HasValue)
			{
				return null;
			}
			using var context = new TasktrackerContext();
			return context.TaskAssigments.Include(x => x.Task).Include(x => x.Employee)
			 .FirstOrDefault(x =>
			(model.TaskId.HasValue && x.TaskId ==
			model.TaskId) && (model.EmployeeId.HasValue && x.
			EmployeeId ==
			model.EmployeeId))
			?.GetViewModel;
		}

		public List<TaskAssigmentViewModel> GetFilteredList(TaskAssigmentSearchModel model)
		{
			if (!model.TaskId.HasValue)
			{
				return new();
			}
			using var context = new TasktrackerContext();
			return context.TaskAssigments
			  .Include(x => x.Task).Include (x => x.Employee)
					.Where(x => x.TaskId == model.TaskId)
			  .Select(x => x.GetViewModel)
			  .ToList();
		}
		public List<TaskViewModel> GetFilteredAssigmentList(EmployeeSearchModel model)
		{
			NpgsqlConnection connection = new NpgsqlConnection("Host=192.168.56.101;Port=5432;Database=tasktracker;Username=postgres;Password=urogil01");
			List<TaskViewModel> tasks = new List<TaskViewModel>();


			connection.Open();
		 using (NpgsqlCommand getRecordStorage = new NpgsqlCommand("Select * from task where task.id in (Select task_assigment.task_id from task_assigment where task_assigment.employee_id in (@employeeId)) ", connection))
			{
				getRecordStorage.Parameters.AddWithValue("employeeId", model.Id);
				using (NpgsqlDataReader reader = getRecordStorage.ExecuteReader())
				{
					
					while (reader.Read())
					{
						TaskViewModel viewModel = ReadTaskView(reader);
						tasks.Add(viewModel);
					}
				}
			}
			connection.Close();
			return tasks;
		}

		public TaskViewModel ReadTaskView(NpgsqlDataReader reader)
		{
			int? id = reader["id"] as int?;
			string name = reader["name"] as string;
			DateTime? date_create = reader["start_date"] as DateTime?;
			DateTime? date_end = reader["end_date"] as DateTime?;
			DateTime? deadline = reader["deadline"] as DateTime?;
			int? project_id = reader["project_id"] as int?;
			string state = reader["state"] as string;

			using var context = new TasktrackerContext();

			TaskViewModel view = new TaskViewModel
			{
				Id = id.Value,
				Name = name,
				DateCreate = (DateTime)date_create,
				DateDone = date_end,
				Deadline = (DateTime)deadline,
				ProjectId = project_id.Value,
				Status = state,
				ProjectName = context.Projects.FirstOrDefault(x => x.Id == project_id)?.Name ?? string.Empty,
			};
			return view;
		}

		public List<TaskAssigmentViewModel> GetFullList()
		{
			using var context = new TasktrackerContext();
			return context.TaskAssigments.Include(x => x.Task).Include(x=> x.Employee)
			.ToList()
			.Select(x => x.GetViewModel)
			.ToList();
		}

		public TaskAssigmentViewModel? Insert(TaskAssigmentBindingModel model)
		{
			using var context = new TasktrackerContext();
			var newProduct = TaskAssigment.Create(model);
			if (newProduct == null)
			{
				return null;
			}
			context.TaskAssigments.Add(newProduct);
			context.SaveChanges();
			return context.TaskAssigments.Include(x => x.Task).Include(x => x.Employee).FirstOrDefault(x => x.TaskId == newProduct.TaskId && x.EmployeeId == newProduct.EmployeeId)?.GetViewModel;
		}

		public TaskAssigmentViewModel? Update(TaskAssigmentBindingModel model)
		{
			using var context = new TasktrackerContext();

			var product = context.TaskAssigments.Include(x => x.Task).Include(x => x.Employee).FirstOrDefault(x => x.TaskId == model.TaskId && x.EmployeeId == model.EmployeeId);
			if (product == null)
			{
				return null;
			}
			product.Update(model);
			context.SaveChanges();

			return product.GetViewModel;
		}

	}

}