/*
    *    Copyright 2009-2023 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.apache.ibatis.submitted.language;
  
  import java.util.ArrayList;
  import java.util.List;
  import java.util.Map;
  
  import org.apache.ibatis.builder.BaseBuilder;
  import org.apache.ibatis.builder.BuilderException;
  import org.apache.ibatis.builder.ParameterExpression;
  import org.apache.ibatis.builder.StaticSqlSource;
  import org.apache.ibatis.mapping.ParameterMapping;
  import org.apache.ibatis.mapping.SqlSource;
  import org.apache.ibatis.parsing.GenericTokenParser;
  import org.apache.ibatis.parsing.TokenHandler;
  import org.apache.ibatis.reflection.MetaClass;
  import org.apache.ibatis.session.Configuration;
  import org.apache.ibatis.type.JdbcType;
  
  /**
   * Just a test case. Not a real Velocity implementation.
   */
  public class VelocitySqlSourceBuilder extends BaseBuilder {
  
    private static final String parameterProperties = "javaType,jdbcType,mode,numericScale,resultMap,typeHandler,jdbcTypeName";
  
    public VelocitySqlSourceBuilder(Configuration configuration) {
      super(configuration);
    }
  
    public SqlSource parse(String originalSql, Class<?> parameterType) {
      ParameterMappingTokenHandler handler = new ParameterMappingTokenHandler(configuration, parameterType);
      GenericTokenParser parser = new GenericTokenParser("@{", "}", handler);
      String sql = parser.parse(originalSql);
      return new StaticSqlSource(configuration, sql, handler.getParameterMappings());
    }
  
    private static class ParameterMappingTokenHandler extends BaseBuilder implements TokenHandler {
  
      private final List<ParameterMapping> parameterMappings = new ArrayList<>();
      private final Class<?> parameterType;
  
      public ParameterMappingTokenHandler(Configuration configuration, Class<?> parameterType) {
        super(configuration);
        this.parameterType = parameterType;
      }
  
      public List<ParameterMapping> getParameterMappings() {
        return parameterMappings;
      }
  
      @Override
      public String handleToken(String content) {
        parameterMappings.add(buildParameterMapping(content));
        return "?";
      }
  
      private ParameterMapping buildParameterMapping(String content) {
        Map<String, String> propertiesMap = parseParameterMapping(content);
        String property = propertiesMap.get("property");
        String jdbcType = propertiesMap.get("jdbcType");
        Class<?> propertyType;
        if (typeHandlerRegistry.hasTypeHandler(parameterType)) {
          propertyType = parameterType;
        } else if (JdbcType.CURSOR.name().equals(jdbcType)) {
          propertyType = java.sql.ResultSet.class;
        } else if (property != null) {
          MetaClass metaClass = MetaClass.forClass(parameterType, configuration.getReflectorFactory());
          if (metaClass.hasGetter(property)) {
            propertyType = metaClass.getGetterType(property);
          } else {
            propertyType = Object.class;
          }
        } else {
          propertyType = Object.class;
        }
        ParameterMapping.Builder builder = new ParameterMapping.Builder(configuration, property, propertyType);
        if (jdbcType != null) {
          builder.jdbcType(resolveJdbcType(jdbcType));
        }
        Class<?> javaType = null;
        String typeHandlerAlias = null;
        for (Map.Entry<String, String> entry : propertiesMap.entrySet()) {
          String name = entry.getKey();
          String value = entry.getValue();
         if ("javaType".equals(name)) {
           javaType = resolveClass(value);
           builder.javaType(javaType);
         } else if ("jdbcType".equals(name)) {
           builder.jdbcType(resolveJdbcType(value));
         } else if ("mode".equals(name)) {
           builder.mode(resolveParameterMode(value));
         } else if ("numericScale".equals(name)) {
           builder.numericScale(Integer.valueOf(value));
         } else if ("resultMap".equals(name)) {
           builder.resultMapId(value);
         } else if ("typeHandler".equals(name)) {
           typeHandlerAlias = value;
         } else if ("jdbcTypeName".equals(name)) {
           builder.jdbcTypeName(value);
         } else if ("property".equals(name)) {
           // Do Nothing
         } else if ("expression".equals(name)) {
           builder.expression(value);
         } else {
           throw new BuilderException("An invalid property '" + name + "' was found in mapping @{" + content
               + "}.  Valid properties are " + parameterProperties);
         }
       }
       if (typeHandlerAlias != null) {
         builder.typeHandler(resolveTypeHandler(javaType, typeHandlerAlias));
       }
       return builder.build();
     }
 
     private Map<String, String> parseParameterMapping(String content) {
       try {
         return new ParameterExpression(content);
       } catch (BuilderException ex) {
         throw ex;
       } catch (Exception ex) {
         throw new BuilderException("Parsing error was found in mapping @{" + content
             + "}.  Check syntax #{property|(expression), var1=value1, var2=value2, ...} ", ex);
       }
     }
   }
 
 }