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/*******************************************************************
 * © 2019 SAP SE or an SAP affiliate company. All rights reserved. *
 *******************************************************************/
package com.sap.cds.impl.parser;

import java.util.List;
import java.util.Map;

import com.jayway.jsonpath.DocumentContext;
import com.jayway.jsonpath.TypeRef;
import com.sap.cds.ql.Insert;
import com.sap.cds.ql.Upsert;
import com.sap.cds.ql.cqn.CqnStructuredTypeRef;
import com.sap.cds.ql.cqn.CqnSyntaxException;
import com.sap.cds.ql.cqn.CqnXsert;
import com.sap.cds.ql.impl.XsertBuilder;

public class XsertParser extends CqnParser {

	private final CqnXsert.Kind kind;

	private static final TypeRef>> LIST_OF_MAPS = new TypeRef>>() {
	};

	private XsertParser(CqnXsert.Kind kind, DocumentContext cqn) {
		super(cqn);
		this.kind = kind;
	}

	public static Insert parseInsert(String cqn) {
		XsertParser parser = new XsertParser(CqnXsert.Kind.INSERT, getDocumentContext(cqn));
		return XsertBuilder.insert(parser.ref()).entries(parser.entries());
	}

	public static Upsert parseUpsert(String cqn) {
		XsertParser parser = new XsertParser(CqnXsert.Kind.UPSERT, getDocumentContext(cqn));
		return XsertBuilder.upsert(parser.ref()).entries(parser.entries());
	}

	private CqnStructuredTypeRef ref() {
		return TokenParser.ref(cqn.read("$." + kind + ".into"));
	}

	private List> entries() {
		List> entries = cqn.read("$." + kind + ".entries", LIST_OF_MAPS);
		if (entries == null) {
			throw new CqnSyntaxException(kind + " without entries is not supported");
		}
		return entries;
	}

}