package com.interplug.qcast.batch.master;

import com.fasterxml.jackson.core.type.TypeReference;
import com.interplug.qcast.biz.displayItem.DisplayItemService;
import com.interplug.qcast.biz.displayItem.dto.BomSyncResponse;
import com.interplug.qcast.util.InterfaceQsp;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
import java.util.List;
import org.springframework.batch.core.Job;
import org.springframework.batch.core.JobExecutionListener;
import org.springframework.batch.core.Step;
import org.springframework.batch.core.configuration.annotation.StepScope;
import org.springframework.batch.core.job.builder.JobBuilder;
import org.springframework.batch.core.repository.JobRepository;
import org.springframework.batch.core.step.builder.StepBuilder;
import org.springframework.batch.item.ItemProcessor;
import org.springframework.batch.item.ItemWriter;
import org.springframework.batch.item.support.ListItemReader;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.http.HttpMethod;
import org.springframework.transaction.PlatformTransactionManager;

/** Bom Item 마스터 동기화 배치 */
@Configuration
public class BomConfiguration implements JobExecutionListener {
  private final DisplayItemService displayItemService;

  private final InterfaceQsp interfaceQsp;

  List<BomSyncResponse> bomSyncList;

  @Value("${qsp.master-bom-batch-url}")
  private String qspInterfaceUrl;

  public BomConfiguration(DisplayItemService displayItemService, InterfaceQsp interfaceQsp) {
    this.displayItemService = displayItemService;
    this.interfaceQsp = interfaceQsp;
  }

  @Bean
  public Job bomJob(JobRepository jobRepository, Step bomStep) {
    return new JobBuilder("bomJob", jobRepository).start(bomStep).build();
  }

  @Bean
  public Step bomStep(JobRepository jobRepository, PlatformTransactionManager transactionManager)
      throws Exception {
    return new StepBuilder("bomStep", jobRepository)
        .<BomSyncResponse, BomSyncResponse>chunk(100, transactionManager)
        .reader(bomReader())
        .processor(bomProcessor())
        .writer(bomWriter())
        .build();
  }

  @Bean
  @StepScope
  public ListItemReader<BomSyncResponse> bomReader() throws Exception {
    this.bomSyncList =
        interfaceQsp.callApiData(
            HttpMethod.GET, qspInterfaceUrl, null, new TypeReference<List<BomSyncResponse>>() {});
    if (bomSyncList == null) {
      return new ListItemReader<>(Collections.emptyList());
    }
    // 2026-05-20 청크 경계에서 같은 키 A/D 가 분리되어 A 가 먼저 MERGE 된 뒤
    // 다음 청크의 D 가 그것을 삭제해버리는 리스크를 차단하기 위해,
    // 전체 리스트를 statCd='D' 우선으로 정렬한다. (Spring Batch 는 청크를 순차 처리하므로
    // 모든 D 청크가 끝난 뒤에 A/U 청크가 시작되어 전역적으로 'A 가 이김' 이 보장됨)
    bomSyncList.sort(
        Comparator.comparingInt((BomSyncResponse b) -> "D".equals(b.getStatCd()) ? 0 : 1));
    return new ListItemReader<>(bomSyncList);
  }

  @Bean
  public ItemProcessor<BomSyncResponse, BomSyncResponse> bomProcessor() {
    return item -> item;
  }

  @Bean
  public ItemWriter<BomSyncResponse> bomWriter() {
    return items -> {
      displayItemService.setBomSyncSave(new ArrayList<>(items.getItems()));
    };
  }
}