const settings = require('../util/settings');
const logger = require('../util/logger');
const zigbeeShepherdConverters = require('zigbee-shepherd-converters');
const Queue = require('queue');

/**
 * This extensions handles configuration of devices.
 */
class DeviceConfigure {
    constructor(zigbee, mqtt, state, publishEntityState) {
        this.zigbee = zigbee;
        this.configured = {};
        this.attempts = {};

        this.queue = new Queue();
        this.queue.concurrency = 1;
        this.queue.autostart = true;
    }

    onZigbeeStarted() {
        this.zigbee.getAllClients().forEach((device) => {
            const mappedDevice = zigbeeShepherdConverters.findByZigbeeModel(device.modelId);

            if (mappedDevice) {
                this.configure(device.ieeeAddr, mappedDevice);
            }
        });
    }

    onZigbeeMessage(message, device, mappedDevice) {
        if (device && mappedDevice) {
            const ieeeAddr = device.ieeeAddr;
            if (!this.configured[ieeeAddr]) {
                this.configure(ieeeAddr, mappedDevice);
            }
        }
    }

    configure(ieeeAddr, mappedDevice) {
        if (!this.attempts.hasOwnProperty(ieeeAddr)) {
            this.attempts[ieeeAddr] = 0;
        }

        if (mappedDevice.configure) {
            const friendlyName = settings.getDevice(ieeeAddr) ? settings.getDevice(ieeeAddr).friendly_name : 'unknown';
            // mark device as currently being configured to prevent race conditions
            this.configured[ieeeAddr] = 'configuring';

            this.queue.push((queueCallback) => {
                logger.debug(`Configuring ${friendlyName} (${ieeeAddr}) ...`);

                // Call configure function of this device.
                mappedDevice.configure(ieeeAddr, this.zigbee.shepherd, this.zigbee.getCoordinator(), (ok, msg) => {
                    if (ok) {
                        logger.info(`Successfully configured ${friendlyName} (${ieeeAddr})`);
                        this.configured[ieeeAddr] = 'configured';
                    } else {
                        // If a device is not joined in the network the configure command may fail
                        // (especially, immediately after zigbee start)
                        // also, this command may fail if the network is busy or lost data packets
                        if (this.attempts[ieeeAddr] > 1) {
                            // Give up after 3 attempts.
                            this.configured[ieeeAddr] = 'failed';
                        } else {
                            // we're not done yet so mark not busy
                            delete this.configured[ieeeAddr];
                        }

                        logger.warn(
                            `Failed to configure ${friendlyName} (${ieeeAddr}) ('${msg}')` +
                            ` (attempt #${this.attempts[ieeeAddr] + 1})`
                        );

                        logger.warn(`This can be ignored if the device is working properly`);

                        this.attempts[ieeeAddr] += 1;
                    }

                    queueCallback();
                });
            });
        } else {
            // no need to configure anyting. So just mark as done
            this.configured[ieeeAddr] = 'configured';
        }
    }
}

module.exports = DeviceConfigure;