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import { MqttClient } from 'mqtt'
import type {
Config,
SnowListener,
EagleListener,
EagleControlData,
} from './types.js'
import type { CommandMessage } from './messages.js'
import { EagleControlMesasge, InstantPushMessage } from './messages.js'
import { EagleController, EagleStatus } from './eagle.js'
import { Signer } from './util.js'
import { SnowStatus } from './snow.js'
export class Topic {
constructor(
public readonly unknown1: boolean,
public readonly unknown2: boolean,
public readonly unknown3: boolean,
public readonly unknown4: boolean,
public readonly deviceId: number,
) {
//
}
static parse(topic: string) {
const components = topic.split('/')
if (components.length !== 7) {
throw new Error('The topic format is expected to be airmx/+/+/+/+/+/+.')
}
if (components[0] !== 'airmx') {
throw new Error('The 1st part of the topic must be "airmx".')
}
if (components[1] !== '01') {
throw new Error('The 2nd part of the topic must be "01".')
}
for (let i = 2; i < 6; i++) {
if (components[i] !== '0' && components[i] !== '1') {
const ordinal = `${i + 1}${i + 1 === 3 ? 'rd' : 'th'}`
throw new Error(
`The ${ordinal} part of the topic must be either "1" or "0".`,
)
}
}
const deviceId = components[6]
if (deviceId === '' || !/^\d+$/.test(deviceId)) {
throw new Error('The 7th part of the topic must be a device ID.')
}
return new this(
components[2] === '1',
components[3] === '1',
components[4] === '1',
components[5] === '1',
+deviceId,
)
}
}
interface AirmxListeners {
eagle: EagleListener[]
snow: SnowListener[]
}
export class Airmx {
#listeners: AirmxListeners = {
eagle: [],
snow: [],
}
#client: MqttClient
#signer
/** Pairs of device ID and its latest running status. */
#eagles
constructor(private readonly config: Config) {
this.#client = this.config.mqtt
this.#client.on('connect', this.#handleConnect.bind(this))
this.#client.on('message', this.#handleMessage.bind(this))
this.#signer = new Signer()
this.#eagles = new Map<number, EagleStatus>()
}
onSnowUpdate(callback: SnowListener) {
this.#listeners.snow.push(callback)
return this
}
onEagleUpdate(callback: EagleListener) {
this.#listeners.eagle.push(callback)
return this
}
#handleConnect() {
this.#client.subscribe('airmx/01/+/+/1/1/+')
// After successfully connecting to the MQTT server, we need to retrieve
// the latest statuses for all devices instead of waiting for them to
// notify us. It also enables us to make partial tweaks to devices.
this.#dispatchAll(InstantPushMessage.make(2, 1))
}
#handleMessage(topic: string, message: Buffer): void {
const { deviceId } = Topic.parse(topic)
const str = message.toString()
const data = JSON.parse(str)
this.#validateMessage(deviceId, str, data.sig)
switch (data.cmdId) {
case SnowStatus.commandId():
this.#notifySnow(SnowStatus.from(deviceId, data))
break
case EagleStatus.commandId():
const status = EagleStatus.from(deviceId, data)
this.#eagles.set(deviceId, status)
this.#notifyEagle(status)
break
}
}
#notifySnow(status: SnowStatus) {
this.#listeners.snow.forEach((listener) => listener(status))
}
#notifyEagle(status: EagleStatus) {
this.#listeners.eagle.forEach((listener) => listener(status))
}
#validateMessage(deviceId: number, message: string, sig: string) {
const device = this.#getDevice(deviceId)
const plainText = message.slice(1, message.lastIndexOf(',"sig"'))
const calculated = this.#signer.signText(plainText, device.key)
if (calculated !== sig) {
throw new Error('Failed to validate the message.')
}
}
control(deviceId: number, data: EagleControlData) {
this.#dispatch(deviceId, EagleControlMesasge.make(data))
}
#dispatch(deviceId: number, message: CommandMessage<unknown>) {
const device = this.#getDevice(deviceId)
const sig = this.#signer.sign(message, device.key)
const payload = { ...message.payload(), sig }
this.#client.publish(
`airmx/01/1/1/0/1/${deviceId}`,
JSON.stringify(payload),
)
}
#dispatchAll(message: CommandMessage<unknown>) {
for (const device of this.config.devices) {
this.#dispatch(device.id, message)
}
}
#getDevice(deviceId: number) {
const device = this.config.devices.find((device) => device.id === deviceId)
if (device === undefined) {
throw new Error(`Could not find the device with ID ${deviceId}.`)
}
return device
}
getEagleStatus(deviceId: number) {
return this.#eagles.get(deviceId)
}
/**
* Specify an AIRMX Pro device.
*
* @param deviceId - The device ID.
* @returns The device controller.
*/
device(deviceId: number) {
return new EagleController(this, deviceId)
}
}
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