package orderService

import (
	"strconv"

	"git.ma-al.com/goc_daniel/b2b/app/delivery/middleware/perms"
	"git.ma-al.com/goc_daniel/b2b/app/model"
	"git.ma-al.com/goc_daniel/b2b/app/repos/cartsRepo"
	"git.ma-al.com/goc_daniel/b2b/app/repos/ordersRepo"
	"git.ma-al.com/goc_daniel/b2b/app/repos/productsRepo"
	"git.ma-al.com/goc_daniel/b2b/app/service/addressesService"
	"git.ma-al.com/goc_daniel/b2b/app/service/emailService"
	constdata "git.ma-al.com/goc_daniel/b2b/app/utils/const_data"
	"git.ma-al.com/goc_daniel/b2b/app/utils/logger"
	"git.ma-al.com/goc_daniel/b2b/app/utils/query/filters"
	"git.ma-al.com/goc_daniel/b2b/app/utils/query/find"
	"git.ma-al.com/goc_daniel/b2b/app/utils/responseErrors"
)

type OrderService struct {
	ordersRepo       ordersRepo.UIOrdersRepo
	cartsRepo        cartsRepo.UICartsRepo
	productsRepo     productsRepo.UIProductsRepo
	addressesService *addressesService.AddressesService
	emailService     *emailService.EmailService
}

func New() *OrderService {
	return &OrderService{
		ordersRepo:       ordersRepo.New(),
		cartsRepo:        cartsRepo.New(),
		productsRepo:     productsRepo.New(),
		addressesService: addressesService.New(),
		emailService:     emailService.NewEmailService(),
	}
}

func (s *OrderService) Find(user *model.Customer, p find.Paging, filt *filters.FiltersList) (*find.Found[model.CustomerOrder], error) {
	if !user.HasPermission(perms.OrdersViewAll) {
		// append filter to view only this user's orders
		idStr := strconv.FormatUint(uint64(user.ID), 10)
		filt.Append(filters.Where("b2b_customer_orders.user_id = " + idStr))
	}

	list, err := s.ordersRepo.Find(user.ID, p, filt)
	if err != nil {
		return nil, err
	}

	for i := 0; i < len(list.Items); i++ {
		address_unparsed, err := s.addressesService.ValidateAddressJson(list.Items[i].AddressString, list.Items[i].CountryID)
		if err != nil {
			logger.Warn("failed to validate address",
				"service", "orderService",
				"order_id", list.Items[i].OrderID,
				"error", err.Error(),
			)
		}

		list.Items[i].AddressUnparsed = &address_unparsed
	}

	return list, nil
}

func (s *OrderService) PlaceNewOrder(user_id uint, cart_id uint, name string, country_id uint, address_info string) error {
	_, err := s.addressesService.ValidateAddressJson(address_info, country_id)
	if err != nil {
		return err
	}

	exists, err := s.cartsRepo.UserHasCart(user_id, cart_id)
	if err != nil {
		return err
	}
	if !exists {
		return responseErrors.ErrUserHasNoSuchCart
	}

	cart, err := s.cartsRepo.RetrieveCart(user_id, cart_id)
	if err != nil {
		return err
	}
	if len(cart.Products) == 0 {
		return responseErrors.ErrEmptyCart
	}

	if name == "" && cart.Name != nil {
		name = *cart.Name
	}

	base_price, tax_incl, tax_excl, err := s.getOrderTotalPrice(user_id, cart_id, country_id)

	// all checks passed
	err = s.ordersRepo.PlaceNewOrder(cart, name, country_id, address_info, base_price, tax_incl, tax_excl)
	if err != nil {
		return err
	}
	// from this point onward we do not cancel this order.

	// if no error is returned, remove the cart. This should be smooth
	err = s.cartsRepo.RemoveCart(user_id, cart_id)
	if err != nil {
		logger.Warn("failed to remove cart after order placement",
			"service", "orderService",
			"user_id", user_id,
			"cart_id", cart_id,
			"error", err.Error(),
		)
	}

	// send email to admin
	go func(user_id uint) {
		err := s.emailService.SendNewOrderPlacedNotification(user_id)
		if err != nil {
			logger.Warn("failed to send new order notification",
				"service", "orderService",
				"user_id", user_id,
				"error", err.Error(),
			)
		}
	}(user_id)

	return nil
}

func (s *OrderService) ChangeOrderAddress(user *model.Customer, order_id uint, country_id uint, address_info string) error {
	_, err := s.addressesService.ValidateAddressJson(address_info, country_id)
	if err != nil {
		return err
	}

	if !user.HasPermission(perms.OrdersModifyAll) {
		exists, err := s.ordersRepo.UserHasOrder(user.ID, order_id)
		if err != nil {
			return err
		}

		if !exists {
			return responseErrors.ErrUserHasNoSuchOrder
		}
	}

	return s.ordersRepo.ChangeOrderAddress(order_id, country_id, address_info)
}

// This is obiously just an initial version of this function
func (s *OrderService) ChangeOrderStatus(user *model.Customer, order_id uint, status string) error {
	if !user.HasPermission(perms.OrdersModifyAll) {
		exists, err := s.ordersRepo.UserHasOrder(user.ID, order_id)
		if err != nil {
			return err
		}

		if !exists {
			return responseErrors.ErrUserHasNoSuchOrder
		}
	}

	return s.ordersRepo.ChangeOrderStatus(order_id, status)
}

func (s *OrderService) getOrderTotalPrice(user_id uint, cart_id uint, country_id uint) (float64, float64, float64, error) {
	cart, err := s.cartsRepo.RetrieveCart(user_id, cart_id)
	if err != nil {
		return 0.0, 0.0, 0.0, err
	}

	base_price := 0.0
	tax_incl := 0.0
	tax_excl := 0.0

	for _, product := range cart.Products {
		prices, err := s.productsRepo.GetPrice(product.ProductID, product.ProductAttributeID, constdata.SHOP_ID, user_id, country_id, product.Amount)
		if err != nil {
			return 0.0, 0.0, 0.0, err
		}

		base_price += prices.Base
		tax_incl += prices.FinalTaxIncl
		tax_excl += prices.FinalTaxExcl
	}

	return base_price, tax_incl, tax_excl, nil
}