package itemapi

import (
	"context"
	item "crossnokaye-interview-assignment/services/item/gen/item"
	"errors"
	"log"
)

// item service example implementation.
// The example methods log the requests and return zero values.
type itemsrvc struct {
	logger *log.Logger
	items  map[string]*item.Item
}

// NewItem returns the item service implementation.
func NewItem(logger *log.Logger) item.Service {
	itemsMap := make(map[string]*item.Item)
	return &itemsrvc{logger, itemsMap}
}

// GetItem implements getItem.
func (s *itemsrvc) GetItem(ctx context.Context, p *item.GetItemPayload) (res *item.Item, err error) {
	s.logger.Print("itemToGet.getItem")

	itemToGet := s.items[*p.Name]
	if itemToGet == nil {
		s.logger.Printf("item with id %d not found", &p.Name)
		return nil, errors.New("item not found")
	}
	res = s.items[*p.Name]

	return
}

func (s *itemsrvc) ListItems(ctx context.Context, payload *item.ListItemsPayload) (res []*item.Item, err error) {
	if payload.NameFilter != nil {
		for _, value := range payload.NameFilter {
			res = append(res, s.items[value])
		}
	} else {
		for _, value := range s.items {
			res = append(res, value)
		}
	}

	return
}

// CreateItem implements createItem.
func (s *itemsrvc) CreateItem(ctx context.Context, p *item.Item) (res *item.Item, err error) {
	s.logger.Print("item.createItem")
	name := p.Name

	s.items[name] = p
	res = s.items[name]

	return
}

// UpdateItem implements updateItem.
func (s *itemsrvc) UpdateItem(ctx context.Context, p *item.Item) (res *item.Item, err error) {
	s.logger.Print("itemToGet.updateItem")
	itemToUpdate := s.items[p.Name]
	if itemToUpdate == nil {
		s.logger.Printf("item with id %d not found", &p.Name)
		return nil, errors.New("item not found")
	}
	s.items[p.Name] = p
	res = s.items[p.Name]

	return
}

// DeleteItem implements deleteItem.
func (s *itemsrvc) DeleteItem(ctx context.Context, p *item.DeleteItemPayload) (err error) {
	s.logger.Print("item.deleteItem")
	itemToDelete := s.items[*p.Name]
	if itemToDelete == nil {
		s.logger.Printf("item with id %d not found", &p.Name)
		return errors.New("item not found")
	}

	delete(s.items, *p.Name)

	return
}