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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.ClassInfo;
import br.com.objectos.way.code.ImportInfoSet;
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.core.util.WayIterables;

import com.google.common.base.Function;
import com.google.common.base.Joiner;
import com.google.common.collect.ImmutableList;

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

  private final List columnList;

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

  public static Pk of(ClassInfo classInfo) {
    List fullList = SqlColumn.columnListOf(classInfo);
    List columnList = WayIterables.from(fullList)
        .filter(SqlColumnIsPrimaryKey.get())
        .toImmutableList();
    return new Pk(columnList);
  }

  public boolean shouldGenerate() {
    return columnList.size() == 1;
  }

  public ImportInfoSet toImportInfoSet() {
    ImportInfoSet importInfoSet = ImportInfoSet.setOf();

    for (SqlColumn column : columnList) {
      column.addTo(importInfoSet);
    }

    return importInfoSet;
  }

  @Override
  public MustacheObject toMustache() {
    List fields = fields();
    return Mustaches.toMustacheHelper()
        .add("fields", fields)
        .add("keyName", keyName())
        .add("parameters", parameters(fields))
        .add("parameterNames", parameterNames(fields))
        .toMustache();
  }

  private List fields() {
    return ImmutableList. builder()
        .add(new PkField("Transaction", "trx"))
        .addAll(transform(columnList, new ToField()))
        .build();
  }

  private String keyName() {
    String keyName = null;

    for (SqlColumn sqlColumn : columnList) {
      keyName = sqlColumn.getKeyName();
      break;
    }

    return keyName;
  }

  private String parameters(List fields) {
    List parts = transform(fields, new ToParameter());
    return Joiner.on(", ").join(parts);
  }

  private String parameterNames(List fields) {
    List parts = transform(fields, new ToParameterName());
    return Joiner.on(", ").join(parts);
  }

  private class ToField implements Function {
    @Override
    public PkField apply(SqlColumn input) {
      return input.toPkField();
    }
  }

  private class ToParameter implements Function {
    @Override
    public String apply(PkField input) {
      return input.declaration();
    }
  }

  private class ToParameterName implements Function {
    @Override
    public String apply(PkField input) {
      return input.name();
    }
  }

}