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/*
 * Copyright 2013 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.io;

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

import java.util.List;

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

/**
 * @author [email protected] (Marcio Endo)
 */
class TableHeader {

  final int maxSize;

  final List columns;

  private TableHeader(int maxSize, List columns) {
    this.maxSize = maxSize;
    this.columns = columns;
  }

  public static TableHeader headerOf(List cols) {
    ToHeader func;
    func = new ToHeader();

    List _columns;
    _columns = transform(cols, func);

    List columns;
    columns = ImmutableList.copyOf(_columns);

    return new TableHeader(func.maxSize, columns);
  }

  public void apachePOI(POISheet sheet) {
    List rows = newArrayListWithExpectedSize(maxSize);

    for (int i = 0; i < maxSize; i++) {
      POIRow row = sheet.createRow(i);
      rows.add(row);
    }

    for (TableColumnHeader header : columns) {
      header.apachePOI(rows);
    }
  }

  private static class ToHeader implements Function {

    int maxSize = 0;

    @Override
    public TableColumnHeader apply(TableColumn input) {
      TableColumnHeader header = input.getHeader();
      maxSize = Math.max(maxSize, header.size());
      return header;
    }

  }

}