/*
    *    Copyright 2012-2022 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 org.mybatis.scripting.velocity;
  
  import java.util.HashMap;
  import java.util.Map;
  
  import org.apache.ibatis.mapping.BoundSql;
  import org.apache.ibatis.mapping.ParameterMapping;
  import org.apache.ibatis.mapping.SqlSource;
  import org.apache.ibatis.session.Configuration;
  
  public class SQLScriptSource implements SqlSource {
  
    protected static final String PARAMETER_OBJECT_KEY = "_parameter";
    protected static final String DATABASE_ID_KEY = "_databaseId";
    protected static final String MAPPING_COLLECTOR_KEY = "_pmc";
    protected static final String VARIABLES_KEY = "_vars";
  
    private static int templateIndex = 0;
  
    private final ParameterMapping[] parameterMappingSources;
    private final Object compiledScript;
    private final Configuration configuration;
  
    public SQLScriptSource(Configuration newConfiguration, String script, Class<?> parameterTypeClass) {
      this.configuration = newConfiguration;
      ParameterMappingSourceParser mappingParser = new ParameterMappingSourceParser(newConfiguration, script,
          parameterTypeClass);
      this.parameterMappingSources = mappingParser.getParameterMappingSources();
      this.compiledScript = VelocityFacade.compile(mappingParser.getSql(), "velocity-template-" + (++templateIndex));
    }
  
    @Override
    public BoundSql getBoundSql(Object parameterObject) {
  
      final Map<String, Object> context = new HashMap<>();
      final ParameterMappingCollector pmc = new ParameterMappingCollector(this.parameterMappingSources, context,
          this.configuration);
  
      context.put(DATABASE_ID_KEY, this.configuration.getDatabaseId());
      context.put(PARAMETER_OBJECT_KEY, parameterObject);
      context.put(MAPPING_COLLECTOR_KEY, pmc);
      context.put(VARIABLES_KEY, this.configuration.getVariables());
  
      final String sql = VelocityFacade.apply(this.compiledScript, context);
      BoundSql boundSql = new BoundSql(this.configuration, sql, pmc.getParameterMappings(), parameterObject);
      for (Map.Entry<String, Object> entry : context.entrySet()) {
        boundSql.setAdditionalParameter(entry.getKey(), entry.getValue());
      }
  
      return boundSql;
  
    }
  
  }