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[int]*item.Item
}

// NewItem returns the item service implementation.
func NewItem(logger *log.Logger) item.Service {
	itemsMap := make(map[int]*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.ID]
	if itemToGet == nil {
		s.logger.Printf("itemToGet with id %d not found", p.ID)
		return nil, errors.New("item not found")
	}
	res = s.items[*p.ID]

	return
}

// CreateItem implements createItem.
func (s *itemsrvc) CreateItem(ctx context.Context, p *item.Item) (res *item.Item, err error) {
	s.logger.Print("item.createItem")
	id := -1

	// Using this method of assigning IDs means they will
	// potentially be non-sequential if ids are deleted
	if p.ID != nil {
		id = *p.ID
	} else {
		id = len(s.items)
	}

	p.ID = &id

	s.items[id] = p
	res = p

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

	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.ID]
	if itemToDelete == nil {
		s.logger.Printf("itemToGet with id %d not found", p.ID)
		return errors.New("item not found")
	}

	delete(s.items, *p.ID)

	return
}