using Microsoft.EntityFrameworkCore;
using RouteGuideContracts.BindingModels;
using RouteGuideContracts.SearchModels;
using RouteGuideContracts.StoragesContracts;
using RouteGuideContracts.ViewModels;
using RouteGuideDatabaseImplement.Models;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace RouteGuideDatabaseImplement.Implements
{
    /// <summary>
    /// Хранилище для сущности "Расписание"
    /// </summary>
    public class ScheduleStorage : IScheduleStorage
    {
        /// <summary>
        /// Получение полного списка
        /// </summary>
        /// <returns></returns>
        public List<ScheduleViewModel> GetFullList()
        {
            using var context = new RouteGuideDatabase();
            return context.Schedules
                .Include(x => x.Route)
                .Select(x => x.GetViewModel)
                .ToList();
        }

        /// <summary>
        /// Получение фильтрованного списка
        /// </summary>
        /// <param name="model"></param>
        /// <returns></returns>
        public List<ScheduleViewModel> GetFilteredList(ScheduleSearchModel model)
        {
            if (model.Id == null)
            {
                return new();
            }

            using var context = new RouteGuideDatabase();
            return context.Schedules
                .Include(x => x.Route)
                .Where(x => x.Id.Equals(model.Id))
                .Select(x => x.GetViewModel)
                .ToList();
        }

        /// <summary>
        /// Получить список из заданного количества элементов
        /// </summary>
        /// <param name="count"></param>
        /// <returns></returns>
        public List<ScheduleViewModel> GetList(int count)
        {
            if (count <= 0)
            {
                return new();
            }

            using var context = new RouteGuideDatabase();
            return context.Schedules
                .Include(x => x.Route)
                .Take(count)
                .Select(x => x.GetViewModel)
                .ToList();
        }

        /// <summary>
        /// Получение элемента
        /// </summary>
        /// <param name="model"></param>
        /// <returns></returns>
        public ScheduleViewModel? GetElement(ScheduleSearchModel model)
        {
            if (model.Id == null)
            {
                return null;
            }

            using var context = new RouteGuideDatabase();
            return context.Schedules
                .Include(x => x.Route)
                .FirstOrDefault(x => (model.Id != null && x.Id.Equals(model.Id)))
                ?.GetViewModel;
        }

        /// <summary>
        /// Добавление элемента
        /// </summary>
        /// <param name="model"></param>
        /// <returns></returns>
        public ScheduleViewModel? Insert(ScheduleBindingModel model)
        {
            using var context = new RouteGuideDatabase();
            var newSchedule = Schedule.Create(context, model);
            if (newSchedule == null)
            {
                return null;
            }

            context.Schedules.Add(newSchedule);
            context.SaveChanges();
            return newSchedule.GetViewModel;
        }

        /// <summary>
        /// Редактирование элемента
        /// </summary>
        /// <param name="model"></param>
        /// <returns></returns>
        public ScheduleViewModel? Update(ScheduleBindingModel model)
        {
            using var context = new RouteGuideDatabase();
            var schedule = context.Schedules.FirstOrDefault(x => x.Id.Equals(model.Id));
            if (schedule == null)
            {
                return null;
            }

            schedule.Update(model);
            context.SaveChanges();
            return schedule.GetViewModel;
        }

        /// <summary>
        /// Удаление элемента
        /// </summary>
        /// <param name="model"></param>
        /// <returns></returns>
        public ScheduleViewModel? Delete(ScheduleBindingModel model)
        {
            using var context = new RouteGuideDatabase();
            var schedule = context.Schedules.FirstOrDefault(x => x.Id.Equals(model.Id));
            if (schedule == null)
            {
                return null;
            }

            context.Schedules.Remove(schedule);
            context.SaveChanges();
            return schedule.GetViewModel;
        }

        /// <summary>
        /// Удаление записи
        /// </summary>
        /// <returns></returns>
        public ScheduleViewModel? Delete()
        {
            using var context = new RouteGuideDatabase();
            if (!context.Schedules.Any())
            {
                return null;
            }

            var element = context.Schedules.First();
            context.Schedules.Remove(element);
            context.SaveChanges();
            return element.GetViewModel;
        }

        /// <summary>
        /// Удаление всех элементов
        /// </summary>
        /// <returns></returns>
        public int Clear()
        {
            using var context = new RouteGuideDatabase();
            int count = context.Schedules.Count();
            if (count <= 0)
            {
                return 0;
            }

            context.Schedules.RemoveRange(context.Schedules);
            context.SaveChanges();
            return count;
        }
    }
}