Promise-ing the lib

[NebzHB]

As enhancement, That would be nice to promise-ing the commands to alexa, that would be easier for command chaining ;-)

[Apollon77]

I'm happy to take PRs :-)

[hive]

This may be helpful (or not) to others, I wrap some of the commands.

/**
 * How often to refresh the routines cache, when the are requested.
 * @type {number}
 */
const ROUTINE_CACHE_LENGTH = 1000 * 60;


class Helper {

    constructor(gateway) {
        this.gateway = gateway;
        this.cacheRoutineUntil = 0;
    }

    /**
     * Pulls SmarthomeDevices into one array and converts the callback into a promise.
     *
     * @returns {Promise<unknown>}
     */
    async getSmarthomeDevices() {

        return new Promise((resolve, reject) => {
            this.gateway.getSmarthomeDevices((err, data) => {
                if (err) return reject(err);

                let info = [];

                try {
                    if (this.isSmarthomeDevicesResponseValid(data)) {
                        let skills = data.locationDetails.Default_Location.amazonBridgeDetails.amazonBridgeDetails;

                        for (let i in skills) {
                            let appliances = skills[i].applianceDetails.applianceDetails;
                            for (let x in appliances) {
                                info.push(appliances[x]);
                            }
                        }
                        resolve(info)
                    } else {
                        return reject(new Error('Smart Home Device Response Invalid'))
                    }
                } catch (e) {
                    return reject(e)
                }
            })
        });
    }

    isSmarthomeDevicesResponseValid (data) {
        return (
            data &&
            data.hasOwnProperty('locationDetails') &&
            data.locationDetails.hasOwnProperty('Default_Location') &&
            data.locationDetails.Default_Location.hasOwnProperty('amazonBridgeDetails') &&
            data.locationDetails.Default_Location.amazonBridgeDetails.hasOwnProperty('amazonBridgeDetails')
        );
    }


    /**
     * Pulls SmarthomeEntities and converts the callback into a promise.
     * @returns {Promise<unknown>}
     */
    async getSmarthomeEntities() {

        return new Promise((resolve, reject) => {
            this.gateway.getSmarthomeEntities((err, data) => {
                if (err) return reject(err);
                resolve(data)
            })
        });
    }

    /**
     * Pulls AutomationRoutines and caches the result. allows filtering of the result and converts the callback into a promise.
     * @param lens
     * @returns {Promise<unknown>}
     */
    async parseRoutines(lens) {
        return new Promise((resolve, reject) => {
            if (Date.now() > this.cacheRoutineUntil) {
                this.cacheRoutineUntil = Date.now() + ROUTINE_CACHE_LENGTH;

                this.gateway.getAutomationRoutines((err, result) => {
                    if (err) return reject(err);

                    this.routines = result;
                    resolve(this.routines.filter(lens));
                });
            } else {
                resolve(this.routines.filter(lens));
            }
        });
    }

    /**
     * Converts executeSmarthomeDeviceAction into a promise
     * @param entityIds
     * @param parameters
     * @param entityType
     * @returns {Promise<unknown>}
     */
    async executeSmarthomeDeviceAction(entityIds, parameters, entityType) {
        return new Promise((resolve, reject) => {
            this.gateway.executeSmarthomeDeviceAction(entityIds, parameters, entityType, (err, data) => {
                if (err) return reject(err);
                resolve(data)
            })
        });
    }

    /**
     * Coverts querySmarthomeDevices into a promise
     *
     * NOTE : this uses an applianceId or applianceIds
     *
     * @param applicanceIds
     * @param entityType
     * @returns {Promise<unknown>}
     */
    async querySmarthomeDevices(applicanceIds, entityType = "APPLIANCE") {
        return new Promise((resolve, reject) => {
            this.gateway.querySmarthomeDevices(applicanceIds, entityType, (err, data) => {
                if (err) return reject(err);
                resolve(data)
            })
        });
    }

    /**
     * Promisified wrapper for sequenceCommand
     * @param serial
     * @param command
     * @param message
     * @returns {Promise<unknown>}
     */
    async sequenceCommand(serial, command, message = false) {
        return new Promise((resolve, reject) => {
            this.gateway.sendSequenceCommand(serial, command, message, (err, data) => {
                if (err) return reject(err);
                resolve(data)
            })
        });
    }

    /**
     * Promisified wrapper for command
     * @param serial
     * @param command
     * @param message
     * @returns {Promise<unknown>}
     */
    async command(serial, command, message = false) {
        return new Promise((resolve, reject) => {
            this.gateway.sendCommand(serial, command, message, (err, data) => {
                if (err) return reject(err);
                resolve(data)
            })
        });
    }


    async init(options) {
        return new Promise((resolve, reject) => {

            this.gateway.init(options, (result) => {
                if (result) return reject(result);
                else return resolve(true);
            });
        });
    }

    async stopProxyServer () {

        return new Promise((resolve, reject) => {

            this.gateway.stopProxyServer( (result) => {
                if (result) return reject(result);
                else return resolve(true);
            });
        });

    }
}

module.exports = Helper;