/*
 * This program is part of the OpenLMIS logistics management information system platform software.
 * Copyright © 2013 VillageReach
 *
 * This program is free software: you can redistribute it and/or modify it under the terms of the GNU Affero General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.
 *  
 * This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Affero General Public License for more details.
 * You should have received a copy of the GNU Affero General Public License along with this program.  If not, see http://www.gnu.org/licenses.  For additional information contact info@OpenLMIS.org. 
 */

package org.openlmis.web.view.pdf.requisition;

import com.itextpdf.text.*;
import com.itextpdf.text.pdf.PdfPCell;
import org.apache.commons.lang.math.NumberUtils;
import org.apache.log4j.Logger;
import org.openlmis.rnr.domain.Column;
import org.openlmis.rnr.domain.ColumnType;
import org.openlmis.rnr.domain.LineItem;
import org.springframework.core.io.ClassPathResource;
import org.springframework.core.io.Resource;
import org.springframework.stereotype.Component;

import java.io.IOException;
import java.text.DecimalFormat;
import java.util.ArrayList;
import java.util.List;

/**
 * This is the class works as a factory of cells to be used in pdf report,
 * it has methods to return a PdfCell with different formatting, like a textCell, headingCell.
 */

@Component
public class RequisitionCellFactory {
  public static final float CELL_PADDING = 5f;
  public static final BaseColor HEADER_BACKGROUND = new BaseColor(210, 210, 210);
  public static final Font H2_FONT = FontFactory.getFont(FontFactory.TIMES, 20f, Font.BOLD, BaseColor.BLACK);
  public static final int WIDTH_PERCENTAGE = 100;
  private static final String OK_IMAGE = "images/ok-icon.png";

  public static final Logger logger = Logger.getLogger(RequisitionCellFactory.class);

  public static PdfPCell numberCell(String value) {
    PdfPCell cell = getPdfPCell(value);
    cell.setHorizontalAlignment(Element.ALIGN_RIGHT);
    return cell;
  }

  private static PdfPCell getPdfPCell(String value) {
    PdfPCell cell = new PdfPCell(new Phrase(value));
    cell.setPadding(CELL_PADDING);
    return cell;
  }

  public static PdfPCell textCell(String value) {
    PdfPCell cell = getPdfPCell(value);
    cell.setHorizontalAlignment(Element.ALIGN_LEFT);
    return cell;
  }

  public static PdfPCell headingCell(String value) {
    Chunk chunk = new Chunk(value, H2_FONT);
    PdfPCell cell = new PdfPCell(new Phrase(chunk));
    cell.setPadding(CELL_PADDING);
    cell.setHorizontalAlignment(Element.ALIGN_LEFT);
    return cell;
  }

  public static List<PdfPCell> getCells(List<? extends Column> visibleColumns,
                                        LineItem lineItem,
                                        String currency) throws NoSuchFieldException, IllegalAccessException, IOException, BadElementException {
    List<PdfPCell> result = new ArrayList<>();
    for (Column column : visibleColumns) {
      ColumnType columnType = column.getColumnType();
      String value = lineItem.getValue(column.getName());
      createCell(result, columnType, value, currency);
    }
    return result;
  }

  private static void createCell(List<PdfPCell> result,
                                 ColumnType columnType,
                                 String columnValue,
                                 String currency) throws IOException, BadElementException {
    DecimalFormat moneyFormatter = new DecimalFormat("#,##0.00");
    DecimalFormat formatter = new DecimalFormat("#,##0");
    switch (columnType) {
      case TEXT:
        result.add(textCell(columnValue));
        break;
      case BOOLEAN:
        PdfPCell pdfPCell = Boolean.valueOf(columnValue) ? imageCell() : textCell("");
        result.add(pdfPCell);
        break;
      case NUMERIC:
        if(!columnValue.isEmpty() && NumberUtils.isNumber(columnValue))
          result.add(numberCell(formatter.format(Double.parseDouble(columnValue))));
        else
          result.add(numberCell(columnValue));
        break;
      case CURRENCY:
        if(!columnValue.isEmpty() && NumberUtils.isNumber(columnValue))
          result.add(numberCell(currency + moneyFormatter.format(Double.parseDouble(columnValue))));
        else
          result.add(numberCell(currency));
          break;

    }
  }

  public static PdfPCell imageCell() throws BadElementException, IOException {
    Resource resource = new ClassPathResource(OK_IMAGE);
    Image image = Image.getInstance(resource.getFile().getAbsolutePath());
    PdfPCell cell = new PdfPCell(image);
    cell.setPadding(CELL_PADDING);
    cell.setVerticalAlignment(Element.ALIGN_MIDDLE);
    cell.setHorizontalAlignment(Element.ALIGN_CENTER);
    return cell;
  }

  public static PdfPCell categoryRow(Integer visibleColumnsSize, LineItem lineItem) {
    Chunk chunk = new Chunk(lineItem.getCategoryName(), FontFactory.getFont(FontFactory.HELVETICA_BOLD));
    PdfPCell cell = new PdfPCell(new Phrase(chunk));
    cell.setColspan(visibleColumnsSize);
    cell.setBackgroundColor(HEADER_BACKGROUND);
    cell.setPadding(CELL_PADDING);
    return cell;
  }

}