using CanteenContracts.BindingModels;
using CanteenContracts.BusinessLogicsContracts;
using CanteenContracts.SearchModel;
using CanteenContracts.SearchModels;
using CanteenContracts.StoragesContracts;
using CanteenContracts.View;
using CanteenDataModels.Enums;
using CanteenDataModels.Models;
using Microsoft.Extensions.Logging;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace CanteenBusinessLogic.BusinessLogics
{
    public class LunchLogic : ILunchLogic
    {
        private readonly ILogger _logger;
        private readonly ILunchStorage _lunchStorage;

        public LunchLogic(ILogger<LunchLogic> logger, ILunchStorage lunchStorage)
        {
            _logger = logger;
            _lunchStorage = lunchStorage;
        }

        public List<LunchViewModel>? ReadList(LunchSearchModel? model)
        {
            _logger.LogInformation("ReadList. Id: {Id}", model?.Id);

            var list = model == null ? _lunchStorage.GetFullList() : _lunchStorage.GetFilteredList(model);
            if (list == null)
            {
                _logger.LogWarning("ReadList return null list");
                return null;
            }

            _logger.LogInformation("ReadList. Count: {Count}", list.Count);
            return list;
        }

        public LunchViewModel? ReadElement(LunchSearchModel model)
        {
            if (model == null)
            {
                throw new ArgumentNullException(nameof(model));
            }

            _logger.LogInformation("ReadElement. Id: {Id}", model.Id);

            var element = _lunchStorage.GetElement(model);
            if (element == null)
            {
                _logger.LogWarning("ReadElement element not found");
                return null;
            }

            _logger.LogInformation("ReadElement find. Id: {Id}", element.Id);
            return element;
        }

        public bool Create(LunchBindingModel model)
        {
            CheckModel(model);

            if (_lunchStorage.Insert(model) == null)
            {
                _logger.LogWarning("Insert operation failed");
                return false;
            }

            return true;
        }

        public bool Update(LunchBindingModel model)
        {
            CheckModel(model);

            if (_lunchStorage.Update(model) == null)
            {
                _logger.LogWarning("Update operation failed");
                return false;
            }

            return true;
        }

        public bool Delete(LunchBindingModel model)
        {
            CheckModel(model, false);

            _logger.LogInformation("Delete. Id: {Id}", model.Id);
            if (_lunchStorage.Delete(model) == null)
            {
                _logger.LogWarning("Delete operation failed");
                return false;
            }

            return true;
        }

        private void CheckModel(LunchBindingModel model, bool withParams = true)
        {
            if (model == null)
            {
                throw new ArgumentNullException(nameof(model));
            }

            if (!withParams)
            {
                return;
            }

            if (string.IsNullOrEmpty(model.LunchName))
            {
                throw new ArgumentNullException("Нет названия обеда", nameof(model.LunchName));
            }

            if (model.VisitorId <= 0)
            {
                throw new ArgumentNullException("id посетителя должен быть больше 0", nameof(model.VisitorId));
            }

            _logger.LogInformation("Lunch. LunchName: {LunchName}. Sum: {Sum}. VisitorId: {VisitorId}. Id: {Id}", model.LunchName, model.Sum, model.VisitorId, model.Id);

            var element = _lunchStorage.GetElement(new LunchSearchModel { Id = model.Id });
            if (element != null && element.Id != model.Id)
            {
                throw new InvalidOperationException("Обед с таким id уже есть");
            }
        }

        public bool Finish(LunchBindingModel model)
        {
            CheckModel(model, false);

            if (_lunchStorage.GetElement(new LunchSearchModel { Id = model.Id })?.Status != LunchStatus.Создан)
            {
                _logger.LogWarning("Invalid lunch status");
                return false;
            }

            model.Status = LunchStatus.Окончен;
            model.DateImplement = DateTime.Now;

            if (_lunchStorage.Update(model) == null)
            {
                _logger.LogWarning("Update operation failed");
            }

            return true;
        }

        public bool UpdateOrders(LunchBindingModel lunch, OrderBindingModel order)
        {
            var _lunch = _lunchStorage.GetElement(new LunchSearchModel { Id = lunch.Id});
            _lunch.LunchOrders[order.Id] = order as IOrderModel;
            if (_lunchStorage.Update(new()
            {
                Id = _lunch.Id,
                LunchName = _lunch.LunchName,
                Sum = _lunch.Sum,
                VisitorId = _lunch.VisitorId,
                DateImplement = _lunch.DateImplement,
                LunchOrders = _lunch.LunchOrders,
                Status = _lunch.Status,

            }) == null)
            {
                _logger.LogWarning("Update operation failed");
                return false;
            }

            return true;
        }

        public bool UpdateProducts(LunchBindingModel lunch, ProductBindingModel product, int count)
        {
            var _lunch = _lunchStorage.GetElement(new LunchSearchModel { Id = lunch.Id });
            double allSum = 0;
            foreach (var lunchProducts in _lunch.LunchProducts)
            {
                IProductModel _product = lunchProducts.Value.Item1;
                int _count = lunchProducts.Value.Item2;
                allSum += _product.Price * _count;
            }
            if (count == -1)
            {
                if (_lunch.LunchProducts.ContainsKey(product.Id))
                {
                    _lunch.LunchProducts.Remove(product.Id);
                    allSum -= product.Price * _lunch.LunchProducts[product.Id].Item2;
                }
            }
            else if (count > 0)
            {
                _lunch.LunchProducts[product.Id] = (product, count);
                allSum += product.Price * count;
            }

            if (_lunchStorage.Update(new()
            {
                Id = _lunch.Id,
                LunchName = _lunch.LunchName,
                VisitorId = _lunch.VisitorId,
                LunchProducts = _lunch.LunchProducts,
                DateCreate = _lunch.DateCreate,
                Status = _lunch.Status,
                DateImplement = _lunch.DateImplement,
                Sum = allSum
            }) == null)
            {
                _logger.LogWarning("Update operation failed");
                return false;
            }

            return true;
        }
    }
}