package map_service

import (
	"context"
	"errors"

	"evening_detective_server/internal/repos/game_map_repo"
)

// ErrItemNotFound indicates that a map item was not found.
var ErrItemNotFound = errors.New("объект карты не найден")

// MapService handles game map items.
type MapService struct {
	repo *game_map_repo.Repo
}

// NewMapService creates a map service.
func NewMapService(repo *game_map_repo.Repo) *MapService {
	return &MapService{repo: repo}
}

// Ensure creates a map item if it does not exist.
func (s *MapService) Ensure(ctx context.Context, gameID int, kind string, itemID string) error {
	return s.repo.Ensure(ctx, gameID, kind, itemID)
}

// List returns map items for a game.
func (s *MapService) List(ctx context.Context, gameID int) ([]*MapItem, error) {
	items, err := s.repo.List(ctx, gameID)
	if err != nil {
		return nil, err
	}
	result := make([]*MapItem, 0, len(items))
	for _, item := range items {
		result = append(result, mapItem(item))
	}
	return result, nil
}

// Update changes a map item's position and visibility.
func (s *MapService) Update(ctx context.Context, item *MapItem) error {
	if err := s.repo.Update(ctx, toRepoItem(item)); err != nil {
		if errors.Is(err, game_map_repo.ErrItemNotFound) {
			return ErrItemNotFound
		}
		return err
	}
	return nil
}

// Delete removes a map item.
func (s *MapService) Delete(ctx context.Context, item *MapItem) error {
	return s.repo.Delete(ctx, toRepoItem(item))
}