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

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

import net.thisptr.jackson.jq.exception.JsonQueryException;
import net.thisptr.jackson.jq.path.ArrayIndexOfPath;
import net.thisptr.jackson.jq.path.ArrayIndexPath;
import net.thisptr.jackson.jq.path.ArrayRangeIndexPath;
import net.thisptr.jackson.jq.path.InvalidPath;
import net.thisptr.jackson.jq.path.ObjectFieldPath;
import net.thisptr.jackson.jq.path.Path;
import net.thisptr.jackson.jq.path.RootPath;

public class PathUtils {
	private static JsonNode parseArraySliceIndices(final JsonNode startOrEnd) throws JsonQueryException {
		if (startOrEnd == null)
			return NullNode.getInstance();
		if (startOrEnd.isNumber())
			return startOrEnd;
		if (startOrEnd.isNull())
			return startOrEnd;
		throw new JsonQueryException("Start and end indices of an array slice must be numbers");
	}

	public static Path toPath(final JsonNode pathObj) throws JsonQueryException {
		if (!pathObj.isArray())
			throw new JsonQueryException("Path must be specified as an array");
		Path path = RootPath.getInstance();
		for (final JsonNode segObj : pathObj) {
			if (segObj.isObject()) {
				final JsonNode start = parseArraySliceIndices(segObj.get("start"));
				final JsonNode end = parseArraySliceIndices(segObj.get("end"));
				path = new ArrayRangeIndexPath(path, start, end);
			} else if (segObj.isNumber()) {
				path = new ArrayIndexPath(path, segObj);
			} else if (segObj.isTextual()) {
				path = new ObjectFieldPath(path, segObj.asText());
			} else if (segObj.isArray()) {
				path = new ArrayIndexOfPath(path, segObj);
			} else {
				path = new InvalidPath(path, segObj);
			}
		}
		return path;
	}
}