using DressAtelierContracts.BindingModels;
using DressAtelierContracts.BusinessLogicContracts;
using DressAtelierContracts.SearchModels;
using DressAtelierContracts.StorageContracts;
using DressAtelierContracts.ViewModels;
using Microsoft.Extensions.Logging;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Transactions;
using System.Xml.Linq;

namespace DressAtelierBusinessLogic.BusinessLogic
{
    public class AtelierLogic : IAtelierLogic
    {
        private readonly ILogger _logger;
        private readonly IAtelierStorage _atelierStorage;
        private readonly IDressStorage _dressStorage;
        public AtelierLogic(ILogger<AtelierLogic> logger, IAtelierStorage atelierStorage, IDressStorage dressStorage)
        {
            _logger = logger;
            _atelierStorage = atelierStorage;
            _dressStorage = dressStorage;
        }

        public bool Create(AtelierBindingModel model)
        {
            CheckAtelier(model);
            if(_atelierStorage.Insert(model) == null)
            {
                _logger.LogWarning("Insert operation failed");
                return false;
            }
            return true;
        }

        public bool Update(AtelierBindingModel model)
        {
            CheckAtelier(model);
            if(_atelierStorage.Update(model) == null)
            {
                _logger.LogWarning("Update operation failed");
                return false;
            }
            return true;
        }

        public bool Delete(AtelierBindingModel model)
        {
            CheckAtelier(model, false);
            _logger.LogInformation("Delete. ID:{ID}", model.ID);
            if(_atelierStorage.Delete(model) == null)
            {
                _logger.LogWarning("Delete operation failed");
                return false;
            }
            return true;
        }

        public AtelierViewModel? ReadElement(AtelierSearchModel model)
        {
            if(model == null)
            {
                throw new ArgumentNullException(nameof(model));
            }
            _logger.LogInformation("ReadElement. AtelierName:{Name}.ID:{ ID}", model.Name, model.ID);
            var atelier = _atelierStorage.GetElement(model);
            if(atelier == null)
            {
                _logger.LogWarning("ReadElement atelier not found");
                return null;
            }
            _logger.LogInformation("ReadElement find. ID:{ID}", atelier.ID);
            return atelier;
        }

        public List<AtelierViewModel>? ReadList(AtelierSearchModel? model)
        {
            _logger.LogInformation("ReadList. AtelierName:{AtelierName}. ID:{ ID}", model?.Name, model?.ID);

            var list = model == null ? _atelierStorage.GetFullList() : _atelierStorage.GetFilteredList(model);

            if(list == null)
            {
                _logger.LogWarning("ReadList return null list");
                return null;
            }
            _logger.LogInformation("ReadList. Count:{Count}", list.Count);
            return list;
        }

        private void CheckAtelier(AtelierBindingModel model, bool withParams = true)
        {
            if(model == null)
            {
                throw new ArgumentNullException(nameof(model));
            }
            if(!withParams)
            {
                return;
            }
            if(string.IsNullOrEmpty(model.Name))
            {
                throw new ArgumentNullException("Invalid atelier name", nameof(model.Name));
            }
            if(string.IsNullOrEmpty(model.Address))
            {
                throw new ArgumentNullException("Invalid atelier address", nameof(model.Address));
            }
            _logger.LogInformation("Atelier. AtelierName:{Name}. Address:{Address}. ID: {ID}", model.Name, model.Address, model.ID);
            var element = _atelierStorage.GetElement(new AtelierSearchModel
            {
                Name = model.Name
            });
            if(element != null && (element.ID == model.ID))
            {
                throw new InvalidOperationException("Atelier with such name already exists");
            }
        }

        public bool CheckQuantity(int quantity)
        {
            return _atelierStorage.CheckDressesQuantity(quantity);
        }

        public (bool result,int quantity) AddDress(AtelierBindingModel? atelierModel, DressBindingModel dressModel, int quantity)
        {
            
            if(dressModel == null || quantity == 0)
            {
                return (false,-1);
            }

            var dress = _dressStorage.GetElement(new DressSearchModel
            {
                ID = dressModel.ID
            });
           
            var atelier = _atelierStorage.GetElement(new AtelierSearchModel
            {
                ID = atelierModel.ID
            });
          

            if(!atelier.DressesList.ContainsKey(dress.ID))
            {
                atelier.DressesList.Add(dress.ID, (dress, 1));
                quantity--;
            }
            
            while(atelier.DressesList.Sum(x => x.Value.Item2) < atelier.MaxTotalOfDresses && quantity != 0)
            {
                var qnt = atelier.DressesList[dressModel.ID];
                qnt.Item2++;
                atelier.DressesList[dressModel.ID] = qnt;
                quantity--;
            }

            atelierModel.Name = atelier.Name;
            atelierModel.Address = atelier.Address;
            atelierModel.DressesList = atelier.DressesList;
            atelierModel.OpeningDate = atelier.OpeningDate;
            atelierModel.MaxTotalOfDresses = atelier.MaxTotalOfDresses;
            if (_atelierStorage.Update(atelierModel) == null)
            {
                _logger.LogWarning("Restocking operation failed");
                throw new Exception("Something went wrong.");
            }
            return (true, quantity);
        }
      
        public bool SellDress(DressSearchModel model, int quantity)
        {            
            if(_atelierStorage.SellDresses(model,quantity))
            {
                return true;
            }
            return false;
        }
       
    }
}