/*
 * Copyright (c) 2004-2022, University of Oslo
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 * Redistributions of source code must retain the above copyright notice, this
 * list of conditions and the following disclaimer.
 *
 * Redistributions in binary form must reproduce the above copyright notice,
 * this list of conditions and the following disclaimer in the documentation
 * and/or other materials provided with the distribution.
 * Neither the name of the HISP project nor the names of its contributors may
 * be used to endorse or promote products derived from this software without
 * specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
 * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
package org.hisp.dhis.dxf2.dataset.streaming;

import java.util.function.Consumer;
import java.util.function.Supplier;
import org.hisp.dhis.dxf2.dataset.CompleteDataSetRegistration;
import org.hisp.dhis.dxf2.dataset.CompleteDataSetRegistrations;
import org.hisp.staxwax.reader.XMLReader;
import org.hisp.staxwax.writer.XMLWriter;

/**
 * @author Halvdan Hoem Grelland
 */
public class StreamingXmlCompleteDataSetRegistrations extends CompleteDataSetRegistrations {
  private static final String XMLNS = "xmlns";

  private static final String NS = "http://dhis2.org/schema/dxf/2.0";

  // --------------------------------------------------------------------------
  // Properties
  // --------------------------------------------------------------------------

  private XMLWriter writer;

  private XMLReader reader;

  // --------------------------------------------------------------------------
  // Constructor
  // --------------------------------------------------------------------------

  public StreamingXmlCompleteDataSetRegistrations(XMLWriter writer) {
    this.writer = writer;
  }

  public StreamingXmlCompleteDataSetRegistrations(XMLReader reader) {
    this.reader = reader;
  }

  // --------------------------------------------------------------------------
  // Logic
  // --------------------------------------------------------------------------

  @Override
  protected void open() {
    if (isWriteMode()) {
      writer.openDocument();
      writer.openElement(FIELD_COMPLETE_DATA_SET_REGISTRATIONS);
      writer.writeAttribute(XMLNS, NS);
    } else {
      reader.moveToStartElement(FIELD_COMPLETE_DATA_SET_REGISTRATIONS);
    }
  }

  @Override
  protected void close() {
    if (isWriteMode()) {
      writer.closeElement();
      writer.closeDocument();
    } else {
      reader.closeReader();
    }
  }

  @Override
  public CompleteDataSetRegistration getCompleteDataSetRegistrationInstance() {
    return new StreamingXmlCompleteDataSetRegistration(writer);
  }

  @Override
  protected void writeField(String fieldName, String value) {
    writer.writeAttribute(fieldName, value);
  }

  // --------------------------------------------------------------------------
  // Getters and setters
  // --------------------------------------------------------------------------

  @Override
  public String getIdScheme() {
    return get(FIELD_ID_SCHEME, super::getIdScheme, super::setIdScheme);
  }

  @Override
  public void setIdScheme(String idScheme) {
    writeField(FIELD_ID_SCHEME, idScheme);
  }

  @Override
  public String getDataSetIdScheme() {
    return get(FIELD_DATA_SET_ID_SCHEME, super::getDataSetIdScheme, super::setDataSetIdScheme);
  }

  @Override
  public void setDataSetIdScheme(String dataSetIdScheme) {
    writeField(FIELD_DATA_SET_ID_SCHEME, dataSetIdScheme);
  }

  @Override
  public String getOrgUnitIdScheme() {
    return get(FIELD_ORG_UNIT_ID_SCHEME, super::getOrgUnitIdScheme, super::setOrgUnitIdScheme);
  }

  @Override
  public void setOrgUnitIdScheme(String orgUnitIdScheme) {
    writeField(FIELD_ORG_UNIT_ID_SCHEME, orgUnitIdScheme);
  }

  @Override
  public String getAttributeOptionComboIdScheme() {
    return get(
        FIELD_ATTR_OPT_COMBO_ID_SCHEME,
        super::getAttributeOptionComboIdScheme,
        super::setAttributeOptionComboIdScheme);
  }

  @Override
  public void setAttributeOptionComboIdScheme(String attributeOptionComboIdScheme) {
    writeField(FIELD_ATTR_OPT_COMBO_ID_SCHEME, attributeOptionComboIdScheme);
  }

  @Override
  public Boolean getDryRun() {
    return get(
        FIELD_DRY_RUN,
        super::getDryRun,
        v -> super.setDryRun(Boolean.parseBoolean(v) ? Boolean.TRUE : null));
  }

  @Override
  public void setDryRun(Boolean dryRun) {
    writeField(FIELD_DRY_RUN, dryRun == null ? null : dryRun.toString());
  }

  @Override
  public String getStrategy() {
    return get(FIELD_IMPORT_STRATEGY, super::getStrategy, super::setStrategy);
  }

  @Override
  public void setStrategy(String strategy) {
    writeField(FIELD_IMPORT_STRATEGY, strategy);
  }

  @Override
  public boolean hasNextCompleteDataSetRegistration() {
    return reader.moveToStartElement(
        FIELD_COMPLETE_DATA_SET_REGISTRATION, FIELD_COMPLETE_DATA_SET_REGISTRATIONS);
  }

  @Override
  public CompleteDataSetRegistration getNextCompleteDataSetRegistration() {
    return new StreamingXmlCompleteDataSetRegistration(reader);
  }

  // --------------------------------------------------------------------------
  // Supportive methods
  // --------------------------------------------------------------------------

  private <T> T get(String fieldName, Supplier<T> getter, Consumer<String> setter) {
    T prop = getter.get();

    if (prop == null) {
      setter.accept(reader.getAttributeValue(fieldName));
    }

    return prop;
  }

  private boolean isWriteMode() {
    return writer != null;
  }
}
