/**
    *    Copyright 2015-2019 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
    *
    *       http://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 org.mybatis.spring.boot.autoconfigure;
  
  import java.beans.PropertyDescriptor;
  import java.util.List;
  import java.util.Set;
  import java.util.stream.Collectors;
  import java.util.stream.Stream;
  
  import javax.sql.DataSource;
  
  import org.apache.ibatis.annotations.Mapper;
  import org.apache.ibatis.mapping.DatabaseIdProvider;
  import org.apache.ibatis.plugin.Interceptor;
  import org.apache.ibatis.scripting.LanguageDriver;
  import org.apache.ibatis.session.Configuration;
  import org.apache.ibatis.session.ExecutorType;
  import org.apache.ibatis.session.SqlSessionFactory;
  import org.apache.ibatis.type.TypeHandler;
  import org.mybatis.spring.SqlSessionFactoryBean;
  import org.mybatis.spring.SqlSessionTemplate;
  import org.mybatis.spring.mapper.MapperFactoryBean;
  import org.mybatis.spring.mapper.MapperScannerConfigurer;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  import org.springframework.beans.BeanWrapper;
  import org.springframework.beans.BeanWrapperImpl;
  import org.springframework.beans.factory.BeanFactory;
  import org.springframework.beans.factory.BeanFactoryAware;
  import org.springframework.beans.factory.InitializingBean;
  import org.springframework.beans.factory.ObjectProvider;
  import org.springframework.beans.factory.support.BeanDefinitionBuilder;
  import org.springframework.beans.factory.support.BeanDefinitionRegistry;
  import org.springframework.boot.autoconfigure.AutoConfigurationPackages;
  import org.springframework.boot.autoconfigure.AutoConfigureAfter;
  import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
  import org.springframework.boot.autoconfigure.condition.ConditionalOnClass;
  import org.springframework.boot.autoconfigure.condition.ConditionalOnMissingBean;
  import org.springframework.boot.autoconfigure.condition.ConditionalOnSingleCandidate;
  import org.springframework.boot.autoconfigure.jdbc.DataSourceAutoConfiguration;
  import org.springframework.boot.context.properties.EnableConfigurationProperties;
  import org.springframework.context.annotation.Bean;
  import org.springframework.context.annotation.Import;
  import org.springframework.context.annotation.ImportBeanDefinitionRegistrar;
  import org.springframework.core.io.Resource;
  import org.springframework.core.io.ResourceLoader;
  import org.springframework.core.type.AnnotationMetadata;
  import org.springframework.util.Assert;
  import org.springframework.util.CollectionUtils;
  import org.springframework.util.ObjectUtils;
  import org.springframework.util.StringUtils;
  
  /**
   * {@link EnableAutoConfiguration Auto-Configuration} for Mybatis. Contributes a {@link SqlSessionFactory} and a
   * {@link SqlSessionTemplate}.
   *
   * If {@link org.mybatis.spring.annotation.MapperScan} is used, or a configuration file is specified as a property,
   * those will be considered, otherwise this auto-configuration will attempt to register mappers based on the interface
   * definitions in or under the root auto-configuration package.
   *
   * @author Eddú Meléndez
   * @author Josh Long
   * @author Kazuki Shimizu
   * @author Eduardo Macarrón
   */
  @org.springframework.context.annotation.Configuration
  @ConditionalOnClass({ SqlSessionFactory.class, SqlSessionFactoryBean.class })
  @ConditionalOnSingleCandidate(DataSource.class)
  @EnableConfigurationProperties(MybatisProperties.class)
  @AutoConfigureAfter({ DataSourceAutoConfiguration.class, MybatisLanguageDriverAutoConfiguration.class })
  public class MybatisAutoConfiguration implements InitializingBean {
  
    private static final Logger logger = LoggerFactory.getLogger(MybatisAutoConfiguration.class);
  
    private final MybatisProperties properties;
  
    private final Interceptor[] interceptors;
  
    private final TypeHandler[] typeHandlers;
  
    private final LanguageDriver[] languageDrivers;
  
    private final ResourceLoader resourceLoader;
  
   private final DatabaseIdProvider databaseIdProvider;
 
   private final List<ConfigurationCustomizer> configurationCustomizers;
 
   public MybatisAutoConfiguration(MybatisProperties properties, ObjectProvider<Interceptor[]> interceptorsProvider,
       ObjectProvider<TypeHandler[]> typeHandlersProvider, ObjectProvider<LanguageDriver[]> languageDriversProvider,
       ResourceLoader resourceLoader, ObjectProvider<DatabaseIdProvider> databaseIdProvider,
       ObjectProvider<List<ConfigurationCustomizer>> configurationCustomizersProvider) {
     this.properties = properties;
     this.interceptors = interceptorsProvider.getIfAvailable();
     this.typeHandlers = typeHandlersProvider.getIfAvailable();
     this.languageDrivers = languageDriversProvider.getIfAvailable();
     this.resourceLoader = resourceLoader;
     this.databaseIdProvider = databaseIdProvider.getIfAvailable();
     this.configurationCustomizers = configurationCustomizersProvider.getIfAvailable();
   }
 
   @Override
   public void afterPropertiesSet() {
     checkConfigFileExists();
   }
 
   private void checkConfigFileExists() {
     if (this.properties.isCheckConfigLocation() && StringUtils.hasText(this.properties.getConfigLocation())) {
       Resource resource = this.resourceLoader.getResource(this.properties.getConfigLocation());
       Assert.state(resource.exists(),
           "Cannot find config location: " + resource + " (please add config file or check your Mybatis configuration)");
     }
   }
 
   @Bean
   @ConditionalOnMissingBean
   public SqlSessionFactory sqlSessionFactory(DataSource dataSource) throws Exception {
     SqlSessionFactoryBean factory = new SqlSessionFactoryBean();
     factory.setDataSource(dataSource);
     factory.setVfs(SpringBootVFS.class);
     if (StringUtils.hasText(this.properties.getConfigLocation())) {
       factory.setConfigLocation(this.resourceLoader.getResource(this.properties.getConfigLocation()));
     }
     applyConfiguration(factory);
     if (this.properties.getConfigurationProperties() != null) {
       factory.setConfigurationProperties(this.properties.getConfigurationProperties());
     }
     if (!ObjectUtils.isEmpty(this.interceptors)) {
       factory.setPlugins(this.interceptors);
     }
     if (this.databaseIdProvider != null) {
       factory.setDatabaseIdProvider(this.databaseIdProvider);
     }
     if (StringUtils.hasLength(this.properties.getTypeAliasesPackage())) {
       factory.setTypeAliasesPackage(this.properties.getTypeAliasesPackage());
     }
     if (this.properties.getTypeAliasesSuperType() != null) {
       factory.setTypeAliasesSuperType(this.properties.getTypeAliasesSuperType());
     }
     if (StringUtils.hasLength(this.properties.getTypeHandlersPackage())) {
       factory.setTypeHandlersPackage(this.properties.getTypeHandlersPackage());
     }
     if (!ObjectUtils.isEmpty(this.typeHandlers)) {
       factory.setTypeHandlers(this.typeHandlers);
     }
     if (!ObjectUtils.isEmpty(this.properties.resolveMapperLocations())) {
       factory.setMapperLocations(this.properties.resolveMapperLocations());
     }
     Set<String> factoryPropertyNames = Stream
         .of(new BeanWrapperImpl(SqlSessionFactoryBean.class).getPropertyDescriptors()).map(PropertyDescriptor::getName)
         .collect(Collectors.toSet());
     Class<? extends LanguageDriver> defaultLanguageDriver = this.properties.getDefaultScriptingLanguageDriver();
     if (factoryPropertyNames.contains("scriptingLanguageDrivers") && !ObjectUtils.isEmpty(this.languageDrivers)) {
       // Need to mybatis-spring 2.0.2+
       factory.setScriptingLanguageDrivers(this.languageDrivers);
       if (defaultLanguageDriver == null && this.languageDrivers.length == 1) {
         defaultLanguageDriver = this.languageDrivers[0].getClass();
       }
     }
     if (factoryPropertyNames.contains("defaultScriptingLanguageDriver")) {
       // Need to mybatis-spring 2.0.2+
       factory.setDefaultScriptingLanguageDriver(defaultLanguageDriver);
     }
 
     return factory.getObject();
   }
 
   private void applyConfiguration(SqlSessionFactoryBean factory) {
     Configuration configuration = this.properties.getConfiguration();
     if (configuration == null && !StringUtils.hasText(this.properties.getConfigLocation())) {
       configuration = new Configuration();
     }
     if (configuration != null && !CollectionUtils.isEmpty(this.configurationCustomizers)) {
       for (ConfigurationCustomizer customizer : this.configurationCustomizers) {
         customizer.customize(configuration);
       }
     }
     factory.setConfiguration(configuration);
   }
 
   @Bean
   @ConditionalOnMissingBean
   public SqlSessionTemplate sqlSessionTemplate(SqlSessionFactory sqlSessionFactory) {
     ExecutorType executorType = this.properties.getExecutorType();
     if (executorType != null) {
       return new SqlSessionTemplate(sqlSessionFactory, executorType);
     } else {
       return new SqlSessionTemplate(sqlSessionFactory);
     }
   }
 
   /**
    * This will just scan the same base package as Spring Boot does. If you want more power, you can explicitly use
    * {@link org.mybatis.spring.annotation.MapperScan} but this will get typed mappers working correctly, out-of-the-box,
    * similar to using Spring Data JPA repositories.
    */
   public static class AutoConfiguredMapperScannerRegistrar implements BeanFactoryAware, ImportBeanDefinitionRegistrar {
 
     private BeanFactory beanFactory;
 
     @Override
     public void registerBeanDefinitions(AnnotationMetadata importingClassMetadata, BeanDefinitionRegistry registry) {
 
       if (!AutoConfigurationPackages.has(this.beanFactory)) {
         logger.debug("Could not determine auto-configuration package, automatic mapper scanning disabled.");
         return;
       }
 
       logger.debug("Searching for mappers annotated with @Mapper");
 
       List<String> packages = AutoConfigurationPackages.get(this.beanFactory);
       if (logger.isDebugEnabled()) {
         packages.forEach(pkg -> logger.debug("Using auto-configuration base package '{}'", pkg));
       }
 
       BeanDefinitionBuilder builder = BeanDefinitionBuilder.genericBeanDefinition(MapperScannerConfigurer.class);
       builder.addPropertyValue("processPropertyPlaceHolders", true);
       builder.addPropertyValue("annotationClass", Mapper.class);
       builder.addPropertyValue("basePackage", StringUtils.collectionToCommaDelimitedString(packages));
       BeanWrapper beanWrapper = new BeanWrapperImpl(MapperScannerConfigurer.class);
       Stream.of(beanWrapper.getPropertyDescriptors())
           // Need to mybatis-spring 2.0.2+
           .filter(x -> x.getName().equals("lazyInitialization")).findAny()
           .ifPresent(x -> builder.addPropertyValue("lazyInitialization", "${mybatis.lazy-initialization:false}"));
       registry.registerBeanDefinition(MapperScannerConfigurer.class.getName(), builder.getBeanDefinition());
     }
 
     @Override
     public void setBeanFactory(BeanFactory beanFactory) {
       this.beanFactory = beanFactory;
     }
 
   }
 
   /**
    * If mapper registering configuration or mapper scanning configuration not present, this configuration allow to scan
    * mappers based on the same component-scanning path as Spring Boot itself.
    */
   @org.springframework.context.annotation.Configuration
   @Import(AutoConfiguredMapperScannerRegistrar.class)
   @ConditionalOnMissingBean({ MapperFactoryBean.class, MapperScannerConfigurer.class })
   public static class MapperScannerRegistrarNotFoundConfiguration implements InitializingBean {
 
     @Override
     public void afterPropertiesSet() {
       logger.debug(
           "Not found configuration for registering mapper bean using @MapperScan, MapperFactoryBean and MapperScannerConfigurer.");
     }
 
   }
 
 }