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

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

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

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 net.thisptr.jackson.jq.internal.misc.JsonNodeUtils;
import net.thisptr.jackson.jq.internal.misc.UnicodeUtils;

@BuiltinFunction("length/0")
public class LengthFunction implements Function {
	@Override
	public List apply(Scope scope, List args, JsonNode in) throws JsonQueryException {
		final List out = new ArrayList();
		out.add(length(in));
		return out;
	}

	public JsonNode length(final JsonNode in) throws JsonQueryException {
		if (in.isTextual()) {
			return IntNode.valueOf(UnicodeUtils.lengthUtf32(in.asText()));
		} else if (in.isArray() || in.isObject()) {
			return new IntNode(in.size());
		} else if (in.isNull()) {
			return new IntNode(0);
		} else if (in.isNumber()) {
			return JsonNodeUtils.asNumericNode(Math.abs(in.asDouble()));
		} else {
			throw JsonQueryException.format("%s has no length", in.getNodeType());
		}
	}
}