/**
 * @file
 *
 * Interface with the OpenStreetMap collaborative mapping database.
 */

const axios = require('axios');
const {isObject} = require('../../util');

/**
 * Submit a query to an Overpass endpoint.
 *
 * See <https://wiki.openstreetmap.org/wiki/Overpass_API/Overpass_QL> for more
 * information on the Overpass Query Language (Overpass QL).
 *
 * @async
 * @param query Query to send.
 * @param [endpoint] Overpass endpoint to use.
 * @return Results returned by the endpoint. If JSON output is requested in
 * the query, the result will automatically be parsed into a JS object.
 */
const runQuery = (
    query,
    endpoint = 'https://lz4.overpass-api.de/api/interpreter'
) => (
    axios.post(endpoint, 'data=' + query)
    .then(res => res.data)
);

exports.runQuery = runQuery;

/**
 * Create a link to add tags into JOSM.
 *
 * The JOSM remote control must be activated and JOSM must be running for this
 * link to work. See <https://wiki.openstreetmap.org/wiki/JOSM/RemoteControl>.
 *
 * @param id Identifier for the object to add the tags to.
 * @param tags List of tags to add, in the `key=value` format.
 * @return Link for remotely adding the tags.
 */
const addTagsToNode = (id, tags) => (
    'http://127.0.0.1:8111/load_object?' + [
        `objects=n${id}`,
        'new_layer=false',
        'addtags=' + tags.join('%7C'),
    ].join('&')
);

exports.addTagsToNode = addTagsToNode;

/**
 * Create a link to view a node.
 *
 * @param id Identifier for the node to view.
 * @return Link to view this node on the OSM website.
 */
const viewNode = id => `https://www.openstreetmap.org/node/${id}`;

exports.viewNode = viewNode;

/**
 * Determine if an OSM way is one-way or not.
 *
 * See <https://wiki.openstreetmap.org/wiki/Key:oneway> for details.
 *
 * @param tags Set of tags of the way.
 * @return True iff. the way is one-way.
 */
const isOneWay = object => (
    object.type === 'way'
    && isObject(object.tags)
    && (object.tags.oneway === 'yes' || object.tags.junction === 'roundabout'
        || object.tags.highway === 'motorway')
);

exports.isOneWay = isOneWay;

/**
 * Determine if an OSM object is a public transport line (route master).
 *
 * See <https://wiki.openstreetmap.org/wiki/Relation:route_master>
 * and <https://wiki.openstreetmap.org/wiki/Public_transport#Route_Master_relations>.
 *
 * @param object OSM object.
 * @return True iff. the relation is a public transport line.
 */
const isTransportLine = object => (
    object.type === 'relation'
    && isObject(object.tags)
    && object.tags.type === 'route_master'
);

exports.isTransportLine = isTransportLine;