package org.gcube.datacatalogue.utillibrary.server.cms;

import static com.google.common.base.Preconditions.checkNotNull;

import java.io.IOException;
import java.io.InvalidObjectException;
import java.net.MalformedURLException;
import java.util.ArrayList;
import java.util.List;

import javax.ws.rs.WebApplicationException;

import org.gcube.datacatalogue.utillibrary.ckan.MarshUnmarshCkanObject;
import org.gcube.datacatalogue.utillibrary.ckan.MarshUnmarshCkanObject.METHOD;
import org.gcube.datacatalogue.utillibrary.shared.ItemStatus;
import org.gcube.datacatalogue.utillibrary.shared.jackan.model.CkanDataset;
import org.gcube.gcat.client.Item;
import org.json.JSONArray;
import org.json.JSONException;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * The Class DataCatalogueCMSImpl.
 *
 * @author Francesco Mangiacrapa at ISTI-CNR francesco.mangiacrapa@isti.cnr.it
 * 
 *         Jun 14, 2021
 */
public class DataCatalogueCMSImpl implements CatalogueContentModeratorSystem {

	private static final Logger LOG = LoggerFactory.getLogger(DataCatalogueCMSImpl.class);

	/**
	 * Checks if is content moderator enabled.
	 *
	 * @return true, if is content moderator enabled
	 */
	@Override
	public boolean isContentModeratorEnabled() {
		// TODO Auto-generated method stub
		return false;
	}

	/**
	 * Sets the status.
	 *
	 * @param itemId    the item id
	 * @param theStatus the the status
	 */
	@Override
	public void setStatus(String itemId, ItemStatus theStatus) {
		// TODO Auto-generated method stub

	}

	/**
	 * Gets the list items for status.
	 *
	 * @param theStatus the the status
	 * @param limit     the limit
	 * @param offset    the offset
	 * @return the list items for status
	 * @throws WebApplicationException the web application exception
	 * @throws MalformedURLException   the malformed URL exception
	 * @throws JSONException
	 */
	@Override
	public List<CkanDataset> getListItemsForStatus(ItemStatus theStatus, int limit, int offset)
			throws WebApplicationException, MalformedURLException, InvalidObjectException {
		LOG.info("called getListItemsForStatus with [status: " + theStatus + "], [limit: " + limit + "], [offset: "
				+ offset + "]");
		List<CkanDataset> listDataset = null;
		checkNotNull(theStatus);
		JSONArray jsonArray = getSourceArrayOfItemsForStatus(theStatus, limit, offset);

		if (jsonArray != null) {
			int size = jsonArray.length();
			listDataset = new ArrayList<CkanDataset>(size);
			LOG.debug("converting " + size + " dataset...");
			for (int i = 0; i < size; i++) {
				String datasetName = null;
				try {
					datasetName = jsonArray.getString(i);
					LOG.trace("reading dataset: " + datasetName);
					String jsonValueDataset = new Item().read(datasetName);
					CkanDataset toCkanDataset = MarshUnmarshCkanObject.toCkanDataset(jsonValueDataset, METHOD.TO_READ);
					LOG.trace("converted as dataset: " + toCkanDataset);
					listDataset.add(toCkanDataset);
				} catch (JSONException | IOException e) {
					LOG.warn("Error on reading/converting the dataset name: " + datasetName, e);
				}
			}
		}

		if (listDataset == null) {
			LOG.info("no dataset returned with status: " + theStatus);
			return listDataset;
		}

		LOG.info("returning listDataset with size: " + listDataset.size());
		return listDataset;
	}

	/**
	 * Gets the source array of items for status read by gCatClient.
	 *
	 * @param theStatus the the status
	 * @param limit     the limit
	 * @param offset    the offset
	 * @return the source array of items for status
	 * @throws WebApplicationException the web application exception
	 * @throws MalformedURLException   the malformed URL exception
	 * @throws JSONException           the JSON exception
	 */
	protected JSONArray getSourceArrayOfItemsForStatus(ItemStatus theStatus, int limit, int offset)
			throws WebApplicationException, MalformedURLException, InvalidObjectException {
		LOG.info("called getSourceArrayOfItemsForStatus with [status: " + theStatus + "], [limit: " + limit
				+ "], [offset: " + offset + "]");
		checkNotNull(theStatus);
		// TODO MUST BE CHANGED FOR THE STATUS
		JSONArray jsonArray = null;
		String datasetNames = new Item().list(limit, offset);
		if (datasetNames != null) {
			LOG.debug("for status " + theStatus + " found dataset: " + datasetNames);
			try {
				jsonArray = new JSONArray(datasetNames);
			} catch (JSONException e) {
				LOG.error("error occurred reading " + datasetNames + " as JSONArray",e);
				throw new InvalidObjectException(e.getMessage());
			}
		}

		return jsonArray;

	}

	/**
	 * Count list items for status.
	 *
	 * @param theStatus the the status
	 * @return the long
	 */
	@Override
	public long countListItemsForStatus(ItemStatus theStatus) {
		LOG.info("called countListItemsForStatus with [status: " + theStatus + "]");
		checkNotNull(theStatus);
		int count = 0;
		try {
			// TODO MUST BE CHANGED FOR THE STATUS
			count = new Item().count();
		} catch (Exception e) {
			LOG.error("Error on couting list items for status " + theStatus, e);
			return -1;
		}

		return count;

	}

	/**
	 * Approve item.
	 *
	 * @param itemId the item id
	 */
	@Override
	public void approveItem(String itemId) {
		// TODO Auto-generated method stub

	}

	/**
	 * Reject item.
	 *
	 * @param itemId            the item id
	 * @param permanentlyDelete the permanently delete
	 * @param reasonMsg         the reason msg
	 */
	@Override
	public void rejectItem(String itemId, boolean permanentlyDelete, String reasonMsg) {
		// TODO Auto-generated method stub

	}

	/**
	 * Permanently delete.
	 *
	 * @param itemId the item id
	 */
	@Override
	public void permanentlyDelete(String itemId) {
		// TODO Auto-generated method stub

	}

}