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package bndtools.tasks;

import java.io.IOException;
import java.net.URI;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.LinkedList;
import java.util.List;
import java.util.Map;
import java.util.Objects;

import org.bndtools.utils.resources.ResourceUtils;
import org.osgi.resource.Capability;
import org.osgi.resource.Requirement;
import org.osgi.resource.Resource;

import aQute.bnd.service.resource.SupportingResource;
import bndtools.model.resolution.RequirementWrapper;

public class ResourceCapReqLoader implements CapReqLoader {

	private final Resource	resource;
	private final String	name;
	private final URI		uri;

	public ResourceCapReqLoader(Resource resource) {
		this.resource = resource;
		this.name = ResourceUtils.getIdentity(resource);
		URI uri = null;
		try {
			uri = ResourceUtils.getURI(ResourceUtils.getContentCapability(resource));
		} catch (Exception e) {

		}
		this.uri = uri;
	}

	@Override
	public String getShortLabel() {
		return name;
	}

	@Override
	public String getLongLabel() {
		return name + "[" + uri + "]";
	}

	@Override
	public Map> loadCapabilities() throws Exception {
		Map> result = new HashMap<>();

		List caps = new ArrayList<>(resource.getCapabilities(null));
		if (resource instanceof SupportingResource sr) {
			for (Resource r : sr.getSupportingResources()) {
				caps.addAll(r.getCapabilities(null));
			}
		}
		for (Capability cap : caps) {
			String ns = cap.getNamespace();
			List listForNamespace = result.get(ns);
			if (listForNamespace == null) {
				listForNamespace = new LinkedList<>();
				result.put(ns, listForNamespace);
			}
			listForNamespace.add(cap);
		}

		return result;
	}

	@Override
	public Map> loadRequirements() throws Exception {
		Map> result = new HashMap<>();

		List reqs = new ArrayList<>(resource.getRequirements(null));
		if (resource instanceof SupportingResource sr) {
			for (Resource r : sr.getSupportingResources()) {
				reqs.addAll(r.getRequirements(null));
			}
		}
		for (Requirement req : reqs) {
			String ns = req.getNamespace();
			List listForNamespace = result.get(ns);
			if (listForNamespace == null) {
				listForNamespace = new LinkedList<>();
				result.put(ns, listForNamespace);
			}
			RequirementWrapper wrapper = new RequirementWrapper(req);
			listForNamespace.add(wrapper);
		}

		return result;
	}

	@Override
	public void close() throws IOException {
		// no-op
	}

	@Override
	public int hashCode() {
		final int prime = 31;
		int result = 1;
		result = prime * result + ((resource == null) ? 0 : resource.hashCode());
		return result;
	}

	@Override
	public boolean equals(Object obj) {
		if (this == obj)
			return true;
		if (obj == null)
			return false;
		if (getClass() != obj.getClass())
			return false;
		ResourceCapReqLoader other = (ResourceCapReqLoader) obj;
		return Objects.equals(resource, other.resource);
	}

}