package org.biojava.bio.structure.domain;

import java.io.InputStream;
import java.net.URL;
import java.util.List;
import java.util.Map;
import java.util.SortedSet;
import java.util.TreeSet;


import org.biojava.bio.structure.align.client.JFatCatClient;
import org.biojava.bio.structure.align.client.StructureName;
import org.biojava.bio.structure.align.util.HTTPConnectionTools;


import org.biojava.bio.structure.scop.ScopDatabase;
import org.biojava.bio.structure.scop.ScopDomain;
import org.biojava.bio.structure.scop.ScopFactory;
import org.biojava.bio.structure.scop.server.XMLUtil;


public class RemoteDomainProvider extends SerializableCache<String,SortedSet<String>> implements DomainProvider{

	public String url = RemotePDPProvider.DEFAULT_SERVER;

	ScopDatabase scop;
	PDPProvider pdp;

	private static String CACHE_FILE_NAME = "remotedomaincache.ser";


	public RemoteDomainProvider(){
		this(false);
	}

	/** initialize this provider with caching enabled
	 * 
	 * @param cache
	 */
	public RemoteDomainProvider(boolean cache){
		super(CACHE_FILE_NAME);

		if( ! cache) {
			disableCache();
			//} else if ( serializedCache.keySet().size() < 20000){
		} else {
			// always load the representaitve assignments from server...
			// this makes sure we always have the latest assignments
			loadRepresentativeDomainAssignments();

		}

		scop = ScopFactory.getSCOP();
		pdp = new RemotePDPProvider(true);


	}

	/** Requests the domain assignments for the current PDB IDs from the PDB.
	 * 
	 */
	private void loadRepresentativeDomainAssignments() {
		AssignmentXMLSerializer results = null;
		try {
			URL u = new URL(url + "getRepresentativeDomains");
			System.out.println(u);
			InputStream response = HTTPConnectionTools.getInputStream(u);
			String xml = JFatCatClient.convertStreamToString(response);			
			//System.out.println(xml);
			results  = AssignmentXMLSerializer.fromXML(xml);

			Map<String,String> data = results.getAssignments();
			System.out.println("got " + data.size() + " ranges from server.");
			for (String key: data.keySet()){
				String range = data.get(key);

				// work around list in results;

				String[] spl = range.split(",");
				SortedSet<String> value = new TreeSet<String>();

				for (String s : spl){
					value.add(s);

				}
				serializedCache.put(key, value);
			}

		} catch (Exception e){
			e.printStackTrace();
		}
		return ;

	}

	@Override
	public SortedSet<String> getDomainNames(String name) {


		if ( name.length() < 4)
			throw new IllegalArgumentException("Can't interpret IDs that are shorter than 4 residues!");

		if ( serializedCache != null){
			if ( serializedCache.containsKey(name)){
				return serializedCache.get(name);
			}
		}

		StructureName n = new StructureName(name);

		List<ScopDomain>scopDomains = scop.getDomainsForPDB(n.getPdbId());

		String chainID = n.getChainId();

		if ( scopDomains == null || scopDomains.size() == 0){
			SortedSet<String> data= getPDPDomains(n);
			cache(name,data);
			return data;
		} else {
			SortedSet<String> r = new TreeSet<String>();
			for ( ScopDomain d: scopDomains){
				StructureName s = new StructureName(d.getScopId());

				if( chainID == null){
					r.add(s.getName());

				} else if( s.getChainId().equalsIgnoreCase(n.getChainId())) {
					// SCOP IDS are case insensitive...
					r.add(s.getName());
				}
			}
			cache(name,r);
			return r;
		}



	}




	private SortedSet<String> getPDPDomains(StructureName n) {
		SortedSet<String> pdpDomains = pdp.getPDPDomainNamesForPDB(n.getPdbId());

		SortedSet<String> r = new TreeSet<String>();
		String chainID = n.getChainId();
		for ( String s : pdpDomains){
			StructureName d = new StructureName(s);
			if ( chainID == null)
				r.add(s);
			else if ( d.getChainId().equals(n.getChainId())){
				r.add(s);
			}
		}
		System.out.println(n + " got PDP domains: "+ r);
		return r;
	}

	public static void main(String[] args){
		String name ="3KIH.A";
		try {
			RemoteDomainProvider me = new RemoteDomainProvider(true);
			System.out.println(me.getDomainNames(name));
			StructureName n = new StructureName(name);
			System.out.println(n);
			//System.out.println(new  AtomCache().getStructure(name));
			me.flushCache();
		} catch (Exception e){
			e.printStackTrace();
		}


	}

	@Override
	public void flushCache() {
		super.flushCache();
		if ( pdp instanceof RemotePDPProvider){
			RemotePDPProvider remotePDP = (RemotePDPProvider)pdp;
			remotePDP.flushCache();
		}
	}

	@Override
	public SortedSet<String> getRepresentativeDomains() {

		String url = "http://source.rcsb.org/jfatcatserver/domains/getRepresentativeDomainNames";
		SortedSet<String> domainRanges = null;
		try {
			URL u = new URL(url);

			InputStream response = HTTPConnectionTools.getInputStream(u);
			String xml = JFatCatClient.convertStreamToString(response);
			//System.out.println(xml);
			domainRanges = XMLUtil.getDomainRangesFromXML(xml);
		} catch (Exception e){
			e.printStackTrace();
		}
		return domainRanges;
	}




}
