/*
    *    Copyright 2016-2026 the original author or authors.
    *
    *    Licensed under the Apache License, Version 2.0 (the "License");
    *    you may not use this file except in compliance with the License.
    *    You may obtain a copy of the License at
    *
    *       https://www.apache.org/licenses/LICENSE-2.0
    *
   *    Unless required by applicable law or agreed to in writing, software
   *    distributed under the License is distributed on an "AS IS" BASIS,
   *    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   *    See the License for the specific language governing permissions and
   *    limitations under the License.
   */
  package examples.springbatch.paging;
  
  import static examples.springbatch.mapper.PersonDynamicSqlSupport.*;
  import static org.mybatis.dynamic.sql.SqlBuilder.isEqualTo;
  import static org.mybatis.dynamic.sql.SqlBuilder.select;
  
  import javax.sql.DataSource;
  
  import org.apache.ibatis.session.SqlSessionFactory;
  import org.mybatis.dynamic.sql.select.render.SelectStatementProvider;
  import org.mybatis.dynamic.sql.update.render.UpdateStatementProvider;
  import org.mybatis.dynamic.sql.util.springbatch.SpringBatchUtility;
  import org.mybatis.spring.SqlSessionFactoryBean;
  import org.mybatis.spring.annotation.MapperScan;
  import org.mybatis.spring.batch.MyBatisBatchItemWriter;
  import org.mybatis.spring.batch.MyBatisPagingItemReader;
  import org.springframework.batch.core.configuration.annotation.EnableBatchProcessing;
  import org.springframework.batch.core.job.Job;
  import org.springframework.batch.core.job.builder.JobBuilder;
  import org.springframework.batch.core.job.parameters.RunIdIncrementer;
  import org.springframework.batch.core.repository.JobRepository;
  import org.springframework.batch.core.step.Step;
  import org.springframework.batch.core.step.builder.StepBuilder;
  import org.springframework.batch.infrastructure.item.ItemProcessor;
  import org.springframework.batch.infrastructure.item.ItemReader;
  import org.springframework.batch.infrastructure.item.ItemWriter;
  import org.springframework.beans.factory.annotation.Autowired;
  import org.springframework.context.annotation.Bean;
  import org.springframework.context.annotation.ComponentScan;
  import org.springframework.context.annotation.Configuration;
  import org.springframework.core.convert.converter.Converter;
  import org.springframework.jdbc.datasource.DataSourceTransactionManager;
  import org.springframework.jdbc.datasource.embedded.EmbeddedDatabaseBuilder;
  import org.springframework.jdbc.datasource.embedded.EmbeddedDatabaseType;
  import org.springframework.transaction.PlatformTransactionManager;
  
  import java.util.Objects;
  
  import examples.springbatch.common.PersonRecord;
  import examples.springbatch.mapper.PersonMapper;
  
  @EnableBatchProcessing
  @Configuration
  @ComponentScan("examples.springbatch.common")
  @MapperScan("examples.springbatch.mapper")
  public class PagingReaderBatchConfiguration {
  
      @Autowired
      private JobRepository jobRepository;
  
      @Bean
      public DataSource dataSource() {
          return new EmbeddedDatabaseBuilder()
                  .setType(EmbeddedDatabaseType.HSQL)
                  .addScript("classpath:/org/springframework/batch/core/schema-drop-hsqldb.sql")
                  .addScript("classpath:/org/springframework/batch/core/schema-hsqldb.sql")
                  .addScript("classpath:/examples/springbatch/schema.sql")
                  .addScript("classpath:/examples/springbatch/data.sql")
                  .build();
      }
  
      @Bean
      public SqlSessionFactory sqlSessionFactory(DataSource dataSource) throws Exception {
          SqlSessionFactoryBean sessionFactory = new SqlSessionFactoryBean();
          sessionFactory.setDataSource(dataSource);
          return Objects.requireNonNull(sessionFactory.getObject());
      }
  
      @Bean
      public PlatformTransactionManager transactionManager(DataSource dataSource) {
          return new DataSourceTransactionManager(dataSource);
      }
  
      @Bean
      public MyBatisPagingItemReader<PersonRecord> reader(SqlSessionFactory sqlSessionFactory) {
          SelectStatementProvider selectStatement =  select(person.allColumns())
                  .from(person)
                  .where(forPagingTest, isEqualTo(true))
                  .orderBy(id)
                  .limit(SpringBatchUtility.MYBATIS_SPRING_BATCH_PAGESIZE)
                  .offset(SpringBatchUtility.MYBATIS_SPRING_BATCH_SKIPROWS)
                  .build()
                  .render(SpringBatchUtility.SPRING_BATCH_PAGING_ITEM_READER_RENDERING_STRATEGY);
  
         MyBatisPagingItemReader<PersonRecord> reader = new MyBatisPagingItemReader<>();
         reader.setQueryId(PersonMapper.class.getName() + ".selectMany");
         reader.setSqlSessionFactory(sqlSessionFactory);
         reader.setParameterValues(SpringBatchUtility.toParameterValues(selectStatement));
         reader.setPageSize(7);
         return reader;
     }
 
     @Bean
     public MyBatisBatchItemWriter<PersonRecord> writer(SqlSessionFactory sqlSessionFactory,
             Converter<PersonRecord, UpdateStatementProvider> convertor) {
         MyBatisBatchItemWriter<PersonRecord> writer = new MyBatisBatchItemWriter<>();
         writer.setSqlSessionFactory(sqlSessionFactory);
         writer.setItemToParameterConverter(convertor);
         writer.setStatementId(PersonMapper.class.getName() + ".update");
         return writer;
     }
 
     @Bean
     public Step step1(ItemReader<PersonRecord> reader, ItemProcessor<PersonRecord, PersonRecord> processor, ItemWriter<PersonRecord> writer) {
         return new StepBuilder("step1", jobRepository)
                 .<PersonRecord, PersonRecord>chunk(7)
                 .reader(reader)
                 .processor(processor)
                 .writer(writer)
                 .build();
     }
 
     @Bean
     public Job upperCaseLastName(Step step1) {
         return new JobBuilder("upperCaseLastName", jobRepository)
                 .incrementer(new RunIdIncrementer())
                 .flow(step1)
                 .end()
                 .build();
     }
 }