/**
 * The contents of this file are subject to the license and copyright
 * detailed in the LICENSE and NOTICE files at the root of the source
 * tree and available online at
 *
 * http://www.dspace.org/license/
 */
package org.dspace.sword2;

import org.dspace.content.Bitstream;
import org.dspace.content.Bundle;
import org.dspace.content.Item;
import org.dspace.core.ConfigurationManager;
import org.dspace.core.Context;
import org.swordapp.server.OriginalDeposit;
import org.swordapp.server.ResourcePart;
import org.swordapp.server.Statement;

import java.sql.SQLException;
import java.util.ArrayList;
import java.util.Date;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

public abstract class GenericStatementDisseminator implements SwordStatementDisseminator
{
	protected SwordUrlManager urlManager;

	protected void populateStatement(Context context, Item item, Statement statement)
			throws DSpaceSwordException
	{
		this.urlManager = new SwordUrlManager(new SwordConfigurationDSpace(), context);
        List<String> includeBundles = this.getIncludeBundles();
        String originalDepositBundle = this.getOriginalDepositsBundle();

        // we only list the original deposits in full if the sword bundle is in the includeBundles
        if (includeBundles.contains(originalDepositBundle))
        {
            List<OriginalDeposit> originalDeposits = this.getOriginalDeposits(context, item, originalDepositBundle);
            statement.setOriginalDeposits(originalDeposits);
        }

		Map<String, String> states = this.getStates(context, item);
        statement.setStates(states);

        // remove the original deposit bundle from the include bundles
        includeBundles.remove(originalDepositBundle);
		List<ResourcePart> resources = this.getResourceParts(context, item, includeBundles);
        statement.setResources(resources);

        Date lastModified = this.getLastModified(context, item);
        statement.setLastModified(lastModified);
	}

	protected List<OriginalDeposit> getOriginalDeposits(Context context, Item item, String swordBundle)
			throws DSpaceSwordException
	{
		try
		{
            // NOTE: DSpace does not store file metadata, so we can't access the information
            // about who deposited what, when, on behalf of whoever.

			List<OriginalDeposit> originalDeposits = new ArrayList<OriginalDeposit>();

            // an original deposit is everything in the SWORD bundle
			Bundle[] swords = item.getBundles(swordBundle);
			for (Bundle sword : swords)
			{
				for (Bitstream bitstream : sword.getBitstreams())
				{
					// note that original deposits don't have actionable urls
					OriginalDeposit deposit = new OriginalDeposit(this.urlManager.getBitstreamUrl(bitstream));
					deposit.setMediaType(bitstream.getFormat().getMIMEType());
					originalDeposits.add(deposit);
				}
			}
			return originalDeposits;
		}
		catch (SQLException e)
		{
			throw new DSpaceSwordException(e);
		}
	}

	protected Map<String, String> getStates(Context context, Item item)
			throws DSpaceSwordException
	{
		SwordConfigurationDSpace config = new SwordConfigurationDSpace();
		WorkflowTools wft = new WorkflowTools();
		Map<String, String> states = new HashMap<String, String>();
		if (item.isWithdrawn())
		{
			String uri = config.getStateUri("withdrawn");
			String desc = config.getStateDescription("withdrawn");
			states.put(uri, desc);
		}
		else if (item.isArchived())
		{
			String uri = config.getStateUri("archive");
			String desc = config.getStateDescription("archive");
			states.put(uri, desc);
		}
		else if (wft.isItemInWorkflow(context, item))
		{
			String uri = config.getStateUri("workflow");
			String desc = config.getStateDescription("workflow");
			states.put(uri, desc);
		}
		else if (wft.isItemInWorkspace(context, item))
		{
			String uri = config.getStateUri("workspace");
			String desc = config.getStateDescription("workspace");
			states.put(uri, desc);
		}
		return states;
	}

	protected List<ResourcePart> getResourceParts(Context context, Item item, List<String> includeBundles)
			throws DSpaceSwordException
	{
		try
		{
			// the list of resource parts is everything in the bundles to be included
			List<ResourcePart> resources = new ArrayList<ResourcePart>();

            for (String bundleName : includeBundles)
            {
                Bundle[] bundles = item.getBundles(bundleName);
                for (Bundle bundle : bundles)
                {
                    for (Bitstream bitstream : bundle.getBitstreams())
                    {
                        // note that individual bitstreams have actionable urls
                        ResourcePart part = new ResourcePart(this.urlManager.getActionableBitstreamUrl(bitstream));
                        part.setMediaType(bitstream.getFormat().getMIMEType());
                        resources.add(part);
                    }
                }
            }

			return resources;
		}
		catch (SQLException e)
		{
			throw new DSpaceSwordException(e);
		}
	}

    protected Date getLastModified(Context context, Item item)
    {
        return item.getLastModified();
    }

    private List<String> getIncludeBundles()
    {
        String cfg = ConfigurationManager.getProperty("swordv2-server", "statement.bundles");
        if (cfg == null || "".equals(cfg))
        {
            cfg = "ORIGINAL, SWORD";
        }
        String[] bits = cfg.split(",");
        List<String> include = new ArrayList<String>();
        for (String bit : bits)
        {
            String bundleName = bit.trim().toUpperCase();
            if (!include.contains(bundleName))
            {
                include.add(bundleName);
            }
        }
        return include;
    }

    private String getOriginalDepositsBundle()
    {
        String swordBundle = ConfigurationManager.getProperty("swordv2-server", "bundle.name");
        if (swordBundle == null)
        {
            swordBundle = "SWORD";
        }
        return swordBundle;
    }
}