ItemService.java

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package com.student_loan.service;
 
import java.util.ArrayList;
import java.util.List;
import java.util.Optional;
import java.util.stream.Collectors;
 
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
 
import com.student_loan.model.Item;
import com.student_loan.model.Item.ItemStatus;
import com.student_loan.model.Loan;
import com.student_loan.repository.ItemRepository;
import com.student_loan.repository.LoanRepository;
import com.student_loan.repository.UserRepository;
import com.student_loan.dtos.LoanAndItemDto;
 
@Service
public class ItemService {
    @Autowired
    private ItemRepository itemRepository;
    @Autowired
    private UserRepository userRepository;
    @Autowired
    private LoanRepository loanRepository;
    
    public List<Item> getAllItems() {
        return itemRepository.findAll();
    }
 
    public List<Item> getAvailableItems() {
        return itemRepository.findByStatus(ItemStatus.AVAILABLE);
    }
 
    public Optional<Item> getItemById(Long id) {
        return itemRepository.findById(id);
    }
 
    public List<Item> getItemsById(List<Long> itemsId) {
        List<Item> items = new ArrayList<>();
        for (Long id : itemsId) {
            Optional<Item> optionalItem = getItemById(id);
            optionalItem.ifPresent(items::add);
        }
        return items;
    }
    
    public List<Item> getItemsByUser(Long id){
        if(userRepository.findById(id).isPresent()) {
            return itemRepository.findByOwner(id);
        }else {
            throw new RuntimeException("Failed to get items! User not found with id: " + id);
        }
    }
    
    public List<Item> getItemsByAvailability(ItemStatus status) {
        return itemRepository.findByStatus(status);
    }
    public Item saveItem(Item item) {
        if(!userRepository.findById(item.getOwner()).isPresent()) {
            throw new RuntimeException("Failed to save item with id "+ item.getId()+": Owner not found with id: " + item.getOwner());
        }else {
            return itemRepository.save(item);
        }
    }
 
    public List<LoanAndItemDto> getItemsLentByUserWithActiveLoans(Long userId) {
        List<Loan> loans = loanRepository.findByLenderAndLoanStatus(userId, Loan.Status.IN_USE);
        
        return loans.stream()
            .map(loan -> {
                Item item = itemRepository.findById(loan.getItem())
                                        .orElseThrow(() -> new RuntimeException("Item no encontrado"));
                LoanAndItemDto loanItemDto = new LoanAndItemDto();
                loanItemDto.setLoanId(loan.getId());
                loanItemDto.setBorrowerId(loan.getBorrower());
                loanItemDto.setLenderId(loan.getLender());
                loanItemDto.setStartDate(loan.getLoanDate());
                loanItemDto.setEndDate(loan.getEstimatedReturnDate());
                loanItemDto.setItemId(item.getId());
                loanItemDto.setItemName(item.getName());
                loanItemDto.setItemDescription(item.getDescription());
                return loanItemDto;
            })
            .collect(Collectors.toList());
    }
 
    public List<LoanAndItemDto> getItemsBorrowedByUserWithActiveLoans(Long userId) {
        List<Loan> loans = loanRepository.findByBorrowerAndLoanStatus(userId, Loan.Status.IN_USE);
        
        return loans.stream()
            .map(loan -> {
                Item item = itemRepository.findById(loan.getItem())
                                        .orElseThrow(() -> new RuntimeException("Item no encontrado"));
                LoanAndItemDto loanItemDto = new LoanAndItemDto();
                loanItemDto.setLoanId(loan.getId());
                loanItemDto.setBorrowerId(loan.getBorrower());
                loanItemDto.setLenderId(loan.getLender());
                loanItemDto.setStartDate(loan.getLoanDate());
                loanItemDto.setEndDate(loan.getEstimatedReturnDate());
                loanItemDto.setItemId(item.getId());
                loanItemDto.setItemName(item.getName());
                loanItemDto.setItemDescription(item.getDescription());
                return loanItemDto;
            })
            .collect(Collectors.toList());
    }
    
    public Item createItem(Item item) {
        Optional<Item> optionalItem = itemRepository.findById(item.getId());
        if (optionalItem.isPresent()) {
            throw new RuntimeException(
                    "Failed to create item with id " + item.getId() + ": Item already exists with id: " + item.getId());
        }else if(!userRepository.findById(item.getOwner()).isPresent()) {
            throw new RuntimeException("Failed to save item with id "+ item.getId()+": Owner not found with id: " + item.getOwner());
        }
        return itemRepository.save(item);
    }
        
    
    public void deleteItem(Long id) {
        itemRepository.deleteById(id);
    }
}