package service

import (
	"errors"

	"gorm.io/gorm"

	"github.com/sundynix/pets-be/internal/ai"
	"github.com/sundynix/pets-be/internal/config"
	"github.com/sundynix/pets-be/internal/model"
	"github.com/sundynix/pets-be/internal/storage"
)

// ErrNotFound 资源不存在（handler 据此返回 40400）
var ErrNotFound = errors.New("not found")

// Service 业务逻辑聚合，方法按领域分散在各文件
type Service struct {
	db      *gorm.DB
	storage *storage.Storage
	cfg     *config.Config
	ai      *ai.Engine
}

func New(db *gorm.DB, st *storage.Storage, cfg *config.Config, engine *ai.Engine) *Service {
	return &Service{db: db, storage: st, cfg: cfg, ai: engine}
}

// ownedPet 校验宠物归属当前用户并返回
func (s *Service) ownedPet(userID, petID uint) (*model.Pet, error) {
	var pet model.Pet
	err := s.db.Where("id = ? AND user_id = ?", petID, userID).First(&pet).Error
	if errors.Is(err, gorm.ErrRecordNotFound) {
		return nil, ErrNotFound
	}
	if err != nil {
		return nil, err
	}
	return &pet, nil
}