customer_usecase.go

package usecase

import (
    "challenge-goapi/model"
    "challenge-goapi/repository"
    "fmt"
)

type CustomerUseCase interface {
    CreateNewCustomer(customer model.Customer) (model.Customer, error)
    FindAllCustomer() ([]model.Customer, error)
    FindCustomerById(id string) (model.Customer, error)
    UpdateCustomer(customer model.Customer) (model.Customer, error)
    DeleteCustomer(id string) error
}

type customerUseCase struct {
    repo repository.CustomerRepository
}

func (c *customerUseCase) CreateNewCustomer(customer model.Customer) (model.Customer, error) {
    return c.repo.Create(customer)
}

func (c *customerUseCase) FindAllCustomer() ([]model.Customer, error) {
    return c.repo.List()
}

func (c *customerUseCase) FindCustomerById(id string) (model.Customer, error) {
    return c.repo.Get(id)
}

func (c *customerUseCase) UpdateCustomer(customer model.Customer) (model.Customer, error) {
    _, err := c.repo.Get(customer.Id)
    if err != nil {
        return model.Customer{}, fmt.Errorf("customer with ID %d not found", customer.Id)
    }
    return c.repo.Update(customer)
}

func (c *customerUseCase) DeleteCustomer(id string) error {
    _, err := c.repo.Get(id)
    if err != nil {
        return fmt.Errorf("customer with ID %d not found", id)
    }
    return c.repo.Delete(id)
}

func NewCustomerUseCase(repo repository.CustomerRepository) CustomerUseCase {
    return &customerUseCase{repo: repo}
}