const UserError = require('vn-loopback/util/user-error');
const axios = require('axios');

module.exports = Self => {
    Self.remoteMethod('optimize', {
        description: 'Return optimized coords',
        accessType: 'READ',
        accepts: [{
            arg: 'addressIds',
            type: 'array',
            required: true
        }],
        returns: {
            type: 'string',
            root: true
        },
        http: {
            path: `/optimize`,
            verb: 'GET'
        }
    });

    Self.optimize = async addressIds => {
        const models = Self.app.models;
        try {
            const osrmConfig = await models.OsrmConfig.findOne();
            if (!osrmConfig) throw new UserError(`OSRM service is not configured`);

            let coords = [];
            for (const addressId of addressIds) {
                const address = await models.Address.findById(addressId);
                coords.push({
                    addressId,
                    latitude: address.latitude.toFixed(6),
                    longitude: address.longitude.toFixed(6)
                });
            }
            const concatCoords = coords
                .map(coord => `${coord.longitude},${coord.latitude}`)
                .join(';');
            const response = await axios.post(`
                ${osrmConfig.url}/trip/v1/driving/${concatCoords}
            `);
            const tolerance = osrmConfig.tolerance;
            for (waypoint of response.data.waypoints) {
                const longitude = waypoint.location[0];
                const latitude = waypoint.location[1];

                const matchedAddress = coords.find(coord =>
                    !coord.position &&
                    Math.abs(coord.latitude - latitude) <= tolerance &&
                    Math.abs(coord.longitude - longitude) <= tolerance
                );
                if (matchedAddress)
                    matchedAddress.position = waypoint.waypoint_index;
                else
                    console.log(`Las coordenadas no se han podido asociar: ${latitude} | ${longitude}`);
            }
            coords.sort((a, b) => {
                const posA = a.position !== undefined ? a.position : Infinity;
                const posB = b.position !== undefined ? b.position : Infinity;
                return posA - posB;
            });
            // Temporal para abrir en maps
            const coordsString = coords
                .map(item => `point=${item.latitude},${item.longitude}`)
                .join('&');
            console.log(`https://graphhopper.com/maps/?${coordsString}&profile=small_truck`);
            // ---------
            return coords;
        } catch (err) {
            switch (err.response?.data?.code) {
            case 'NoTrips':
                throw new UserError('No trips found because input coordinates are not connected');
            case 'NotImplemented':
                throw new UserError('This request is not supported');
            case 'InvalidOptions':
                throw new UserError('Invalid options or too many coordinates');
            default:
                throw err;
            }
        }
    };
};