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package net.thisptr.jackson.jq.internal.functions;

import java.util.ArrayList;
import java.util.List;

import net.thisptr.jackson.jq.Function;
import net.thisptr.jackson.jq.JsonQuery;
import net.thisptr.jackson.jq.Scope;
import net.thisptr.jackson.jq.exception.JsonQueryException;
import net.thisptr.jackson.jq.internal.BuiltinFunction;

import com.fasterxml.jackson.databind.JsonNode;
import com.fasterxml.jackson.databind.node.IntNode;
import com.fasterxml.jackson.databind.node.NullNode;

@BuiltinFunction("index/1")
public class IndexFunction implements Function {
	@Override
	public List apply(Scope scope, List args, JsonNode in) throws JsonQueryException {
		final List out = new ArrayList<>();
		for (final JsonNode needle : args.get(0).apply(scope, in)) {
			final List tmp = IndicesFunction.indices(needle, in);
			if (tmp.isEmpty()) {
				out.add(NullNode.getInstance());
			} else {
				out.add(new IntNode(tmp.get(0)));
			}
		}
		return out;
	}
}