using Microsoft.EntityFrameworkCore;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using TaskTrackerContracts.BindingModels;
using TaskTrackerContracts.SearchModels;
using TaskTrackerContracts.StoragesContracts;
using TaskTrackerContracts.ViewModels;
using Task = TaskTrackerDatabase.Models.Task;

namespace TaskTrackerDatabase.Implements
{
    public class TaskStorage : ITaskStorage
    {
        public List<TaskViewModel> GetFullList()
        {
            using var context = new TaskTrackerDatabase();
            return context.Tasks
                    .Include(x => x.Project)
                    .Include(x => x.User)
                    .Select(x => x.GetViewModel)
                    .ToList();
        }

        public List<TaskViewModel> GetFilteredList(TaskSearchModel model)
        {
            using var context = new TaskTrackerDatabase();
            if (model.Id.HasValue)
            {
                return context.Tasks
                    .Include(x => x.Project)
                    .Include(x => x.User)
                    .Where(x => x.Id == model.Id)
                    .Select(x => x.GetViewModel)
                    .ToList();
            }
            else if (model.UserId.HasValue)
            {
                return context.Tasks
                    .Include(x => x.Project)
                    .Include(x => x.User)
                    .Where(x => x.UserId == model.UserId)
                    .Select(x => x.GetViewModel)
                    .ToList();
            }
            return new();
        }

        public TaskViewModel? GetElement(TaskSearchModel model)
        {
            if (!model.Id.HasValue)
            {
                return null;
            }
            using var context = new TaskTrackerDatabase();
            return context.Tasks
                    .Include(x => x.Project)
                    .Include(x => x.User)
                    .FirstOrDefault(x => x.Id == model.Id)
                    ?.GetViewModel;
        }

        public TaskViewModel? Insert(TaskBindingModel model)
        {
            var newTask = Task.Create(model);
            if (newTask == null)
            {
                return null;
            }
            using var context = new TaskTrackerDatabase();
            context.Tasks.Add(newTask);
            context.SaveChanges();
            return context.Tasks
                      .Include(x => x.Project)
                      .Include(x => x.User)
                      .FirstOrDefault(x => x.Id == newTask.Id)
                      ?.GetViewModel;
        }

        public TaskViewModel? Update(TaskBindingModel model)
        {
            using var context = new TaskTrackerDatabase();
            var order = context.Tasks.FirstOrDefault(x => x.Id == model.Id);
            if (order == null)
            {
                return null;
            }
            order.Update(model);
            context.SaveChanges();
            return context.Tasks
                         .Include(x => x.Project)
                         .Include(x => x.User)
                         .FirstOrDefault(x => x.Id == model.Id)
                         ?.GetViewModel;
        }

        public TaskViewModel? Delete(TaskBindingModel model)
        {
            using var context = new TaskTrackerDatabase();
            var element = context.Tasks.FirstOrDefault(rec => rec.Id == model.Id);
            if (element != null)
            {
                var deletedElement = context.Tasks
                                           .Include(x => x.Project)
                                           .Include(x => x.User)
                                           .FirstOrDefault(x => x.Id == model.Id)
                                           ?.GetViewModel;
                context.Tasks.Remove(element);
                context.SaveChanges();
                return deletedElement;
            }
            return null;
        }
    }
}