package eu.dnetlib.dhp.oa.provision.utils;

import static eu.dnetlib.dhp.oa.provision.utils.GraphMappingUtils.removePrefix;
import static eu.dnetlib.dhp.oa.provision.utils.XmlSerializationUtils.escapeXml;

import java.io.IOException;
import java.util.ArrayList;
import java.util.Collection;
import java.util.List;
import java.util.stream.Collectors;

import org.apache.commons.lang3.StringUtils;
import org.stringtemplate.v4.ST;

import eu.dnetlib.dhp.schema.oaf.DataInfo;
import eu.dnetlib.dhp.schema.oaf.OafEntity;

public class TemplateFactory {

	private final TemplateResources resources;

	private static final char DELIMITER = '$';

	public TemplateFactory() {
		try {
			resources = new TemplateResources();
		} catch (IOException e) {
			throw new IllegalStateException(e);
		}
	}

	public String buildBody(
		final String type,
		final List<String> metadata,
		final List<String> rels,
		final List<String> children,
		final List<String> extraInfo) {
		ST body = getTemplate(resources.getEntity());

		body.add("name", type);
		body.add("metadata", metadata);
		body.add("rels", rels);
		body.add("children", children);
		body.add("extrainfo", extraInfo);

		return body.render();
	}

	public String getChild(final String name, final String id, final List<String> metadata) {
		return getTemplate(resources.getChild())
			.add("name", name)
			.add("hasId", !(id == null))
			.add("id", id != null ? escapeXml(removePrefix(id)) : "")
			.add("metadata", metadata)
			.render();
	}

	public String buildRecord(
		final OafEntity entity, final String schemaLocation, final String body) {
		return getTemplate(resources.getRecord())
			.add("id", escapeXml(removePrefix(entity.getId())))
			.add("dateofcollection", entity.getDateofcollection())
			.add("dateoftransformation", entity.getDateoftransformation())
			.add("schemaLocation", schemaLocation)
			.add("it", body)
			.render();
	}

	public String getRel(
		final String type,
		final String objIdentifier,
		final Collection<String> fields,
		final String semanticclass,
		final String semantischeme,
		final DataInfo info,
		final boolean validated,
		final String validationDate) {
		return getTemplate(resources.getRel())
			.add("type", type)
			.add("objIdentifier", escapeXml(removePrefix(objIdentifier)))
			.add("class", semanticclass)
			.add("scheme", semantischeme)
			.add("metadata", fields)
			.add("inferred", info.getInferred())
			.add("trust", info.getTrust())
			.add("inferenceprovenance", info.getInferenceprovenance())
			.add(
				"provenanceaction",
				info.getProvenanceaction() != null ? info.getProvenanceaction().getClassid() : "")
			.add("validated", validated)
			.add("validationdate", validationDate)
			.render();
	}

	public String getInstance(
		final String resultId, final List<String> instancemetadata, final List<String> webresources) {
		return getTemplate(resources.getInstance())
			.add("instanceId", escapeXml(removePrefix(resultId)))
			.add("metadata", instancemetadata)
			.add(
				"webresources",
				(webresources != null ? webresources : new ArrayList<String>())
					.stream()
					.filter(StringUtils::isNotBlank)
					.map(w -> getWebResource(w))
					.collect(Collectors.toList()))
			.render();
	}

	private String getWebResource(final String identifier) {
		return getTemplate(resources.getWebresource())
			.add("identifier", escapeXml(identifier))
			.render();
	}

	// HELPERS

	private ST getTemplate(final String res) {
		return new ST(res, DELIMITER, DELIMITER);
	}
}