package kr.wisestone.owl.service.impl;

import kr.wisestone.owl.constant.MsgConstants;
import kr.wisestone.owl.domain.IssueNumberGenerator;
import kr.wisestone.owl.domain.Project;
import kr.wisestone.owl.exception.OwlRuntimeException;
import kr.wisestone.owl.repository.IssueNumberGeneratorRepository;
import kr.wisestone.owl.service.IssueNumberGeneratorService;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.jpa.repository.JpaRepository;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.util.Iterator;
import java.util.Map;

@Service
public class IssueNumberGeneratorServiceImpl extends AbstractServiceImpl<IssueNumberGenerator, Long, JpaRepository<IssueNumberGenerator, Long>> implements IssueNumberGeneratorService {

    private static final Logger log = LoggerFactory.getLogger(IssueNumberGeneratorServiceImpl.class);

    @Autowired
    private IssueNumberGeneratorRepository issueNumberGeneratorRepository;

    @Override
    protected JpaRepository<IssueNumberGenerator, Long> getRepository() {
        return this.issueNumberGeneratorRepository;
    }

    //  각 프로젝트의 이슈 번호를 자동으로 생성한다.
    @Override
    @Transactional(readOnly = true)
    public Long generateIssueNumber(Project project) {
        IssueNumberGenerator issueNumberGenerator = this.issueNumberGeneratorRepository.findByProjectId(project.getId());

        if (issueNumberGenerator == null) {
            issueNumberGenerator = new IssueNumberGenerator(project, 0L);
        }
        else {
            issueNumberGenerator.setNumber(issueNumberGenerator.getNumber() + 1);
        }

        this.issueNumberGeneratorRepository.saveAndFlush(issueNumberGenerator);

        return issueNumberGenerator.getNumber();
    }

    //  이슈 엑셀 import 가 완료된 후 사용된 issue number 를 업데이트해준다.
    @Override
    @Transactional
    public void updateIssueNumber(Map<Long, Long> issueNumberMaps) {
        Iterator iterator = issueNumberMaps.keySet().iterator();

        while(iterator.hasNext()) {
            Long projectId = (Long)iterator.next();
            IssueNumberGenerator issueNumberGenerator = this.issueNumberGeneratorRepository.findByProjectId(projectId);

            if (issueNumberGenerator == null) {
                throw new OwlRuntimeException(
                        this.messageAccessor.getMessage(MsgConstants.ISSUE_NUMBER_GENERATOR_NOT_EXIST));
            }

            Long issueNumber = issueNumberMaps.get(projectId);

            if (issueNumber == null) {
                throw new OwlRuntimeException(
                        this.messageAccessor.getMessage(MsgConstants.ISSUE_NUMBER_NOT_EXIST));
            }

            issueNumberGenerator.setNumber(--issueNumber);
            this.issueNumberGeneratorRepository.saveAndFlush(issueNumberGenerator);
        }
    }

}