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/*
 * Copyright 2015 Objectos, Fábrica de Software LTDA.
 *
 * 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 br.com.objectos.way.sql.compiler;

import static com.google.common.collect.Lists.transform;

import java.util.List;

import br.com.objectos.way.code.AnnotationInfo;
import br.com.objectos.way.code.AnnotationInfoMap;
import br.com.objectos.way.code.AnnotationValueInfo;
import br.com.objectos.way.code.MethodInfo;
import br.com.objectos.way.code.SimpleTypeInfo;
import br.com.objectos.way.core.tmpl.mustache.IsMustacheSerializable;
import br.com.objectos.way.core.tmpl.mustache.MustacheObject;
import br.com.objectos.way.core.tmpl.mustache.Mustaches;
import br.com.objectos.way.sql.Column;
import br.com.objectos.way.sql.SortOrder;

import com.google.common.base.Function;
import com.google.common.base.Joiner;
import com.google.common.base.Optional;

/**
 * @author [email protected] (Marcio Endo)
 */
class QueryOrderBy implements IsMustacheSerializable {

  private final List columnList;

  private QueryOrderBy(List columnList) {
    this.columnList = columnList;
  }

  public static QueryOrderBy wrap(MethodInfo methodInfo) {
    AnnotationInfoMap annotationInfoMap = methodInfo.annotationInfoMap();
    List columnList = annotationInfoMap.getAnnotatedWith(Column.class);
    return new QueryOrderBy(columnList);
  }

  @Override
  public MustacheObject toMustache() {
    return Mustaches.toMustacheHelper()
        .add("declaration", declaration())
        .add("render", render())
        .toMustache();
  }

  private String declaration() {
    List declarationList = transform(columnList, new ToDeclaration());
    return Joiner.on(", ").join(declarationList);
  }

  private boolean render() {
    return columnList.size() > 0;
  }

  private class ToDeclaration implements Function {
    @Override
    public String apply(AnnotationInfo input) {
      SimpleTypeInfo table = input.getEnclosingTypeInfo().get();
      AnnotationInfo column = input.annotationInfoMap().get(Column.class).get();
      Optional maybeColumnName = column.getValue("name");
      AnnotationValueInfo columnName = maybeColumnName.get();

      Optional maybeOrderBy = input.getValue("orderBy");
      AnnotationValueInfo orderBy = maybeOrderBy.get();
      SortOrder sortOrder = orderBy.getEnumValue(SortOrder.class);

      return String.format("%s.%s().%s()",
          table.getSimpleName(), columnName.getStringValue(), sortOrder.name().toLowerCase());
    }
  }

}