package org.simantics.modeling;

import java.util.HashMap;
import java.util.HashSet;
import java.util.Map;

import org.simantics.databoard.Bindings;
import org.simantics.db.ReadGraph;
import org.simantics.db.Resource;
import org.simantics.db.common.request.ResourceRead;
import org.simantics.db.exception.DatabaseException;
import org.simantics.db.layer0.request.PropertyInfo;
import org.simantics.db.layer0.request.UnescapedPropertyMapOfResource;
import org.simantics.layer0.Layer0;
import org.simantics.structural2.ConnectionImpl;
import org.simantics.structural2.Functions.StructuralChildMapOfResource;
import org.simantics.structural2.queries.ConnectionPointMapOfResource;

public class ImmutableComponentVariableContentRequest extends ResourceRead<ImmutableComponentVariableContent> {

	protected ImmutableComponentVariableContentRequest(Resource resource) {
		super(resource);
	}
	
	@Override
	public ImmutableComponentVariableContent perform(ReadGraph graph) throws DatabaseException {
		
		Layer0 L0 = Layer0.getInstance(graph);
		String name = graph.getRelatedValue(resource, L0.HasName, Bindings.STRING);
		ImmutableComponentVariableContent result = new ImmutableComponentVariableContent(resource, name);
		
		Map<String,PropertyInfo> pis = graph.syncRequest(new UnescapedPropertyMapOfResource(resource));
		
		for(Map.Entry<String, PropertyInfo> e : pis.entrySet()) {
			PropertyInfo pi = e.getValue();
			if(pi.isHasProperty) {
				ImmutableComponentPropertyContent pc = graph.syncRequest(new ImmutableComponentPropertyContentRequest(resource, pi));
				if(pc != null) {
					if(result.properties == null) result.properties = new HashMap<>();
					result.properties.put(pc.pi.name, pc);
				}
			}
		}

		Map<String,PropertyInfo> cps = graph.syncRequest(new ConnectionPointMapOfResource(graph, resource));
		for(Map.Entry<String, PropertyInfo> e : cps.entrySet()) {
			PropertyInfo pi = e.getValue();
			Resource conn = graph.getPossibleObject(resource, pi.predicate);
			if(conn != null) {
				if(result.properties == null) result.properties = new HashMap<>();
				result.properties.put(pi.name, new ImmutableComponentPropertyContent(pi, conn, new ConnectionImpl(pi.predicate), null));
			}
		}
		
		HashSet<Resource> childSet = null;
		for(Resource child : graph.syncRequest(new StructuralChildMapOfResource(resource)).values()) {
			if(childSet == null)
				childSet = new HashSet<>();
			childSet.add(child);
		}
		
		if(childSet != null) {
			result.children = new HashMap<>();
			for(Resource child : childSet) {
				ImmutableComponentVariableContent content = graph.syncRequest(new ImmutableComponentVariableContentRequest(child)); 
				result.children.put(content.name, content);
			}
		}
		
		return result;
		
	}

	
}