/* istanbul ignore file */
const settings = require('../util/settings');
const logger = require('../util/logger');
const BaseExtension = require('./baseExtension');

const topicRegex = new RegExp(`^${settings.get().mqtt.base_topic}/bridge/device/(.+)/get_group_membership$`);

class DeviceGroupMembership extends BaseExtension {
    onMQTTConnected() {
        this.mqtt.subscribe(`${settings.get().mqtt.base_topic}/bridge/device/+/get_group_membership`);
    }

    async onMQTTMessage(topic, message) {
        const match = topic.match(topicRegex);
        if (!match) {
            return null;
        }

        const entity = this.zigbee.resolveEntity(match[1]);
        if (!entity || entity.type !== 'device') {
            logger.error(`Device '${match[1]}' does not exist`);
            return;
        }

        const response = await entity.endpoint.command(
            `genGroups`, 'getMembership', {groupcount: 0, grouplist: []}, {}, true
        );

        const {grouplist, capacity} = response;
        const msgGroupList = `${entity.device.ieeeAddr} is in groups [${grouplist}]`;
        let msgCapacity;
        if (capacity === 254) {
            msgCapacity = 'it can be a part of at least 1 more group';
        } else {
            msgCapacity = `its remaining group capacity is ${capacity === 255 ? 'unknown' : capacity}`;
        }
        logger.info(`${msgGroupList} and ${msgCapacity}`);

        this.publishEntityState(entity.device.ieeeAddr, {group_list: grouplist, group_capacity: capacity});
    }
}

module.exports = DeviceGroupMembership;