// Config
const { getDeviceID } = require('../utilities/configHandler.js');
// Modules
const alsaInstance = require('alsa-capture');
const { returnAlsaDeviceObject } = require("../utilities/executeConsoleCommands.js");
// Debug
const { DebugBuilder } = require("../utilities/debugBuilder.js");
// Global Vars
const log = new DebugBuilder("client-bot", "audioController");

/**
 * Checks to make sure the selected audio device is available and returns the device object (PortAudio Device Info)
 * At least one option must be supplied, it will prefer ID to device name
 *
 * @param deviceName The name of the device being queried
 * @param deviceId The ID of the device being queried
 * @returns {unknown}
 */
exports.confirmAudioDevice = async function confirmAudioDevice({deviceName = undefined, deviceId = undefined}){
    const deviceList = await getAudioDevices();
    if (!deviceName && !deviceId) throw new Error("No device given");
    if (deviceId) return deviceList.find(device => device.id === deviceId);
    if (deviceName) return deviceList.find(device => device.name === deviceName);
}

/**
 * Return a list of the audio devices connected with input channels
 *
 * @returns {unknown[]}
 */
exports.getAudioDevices = async function getAudioDevices(){
    // Exec output contains both stderr and stdout outputs    
    const deviceList = await returnAlsaDeviceObject();
    log.DEBUG("Device list: ", deviceList);

    return deviceList;
}

/**
 * Create and return the audio instance from the saved settings
 * TODO Allow the client to save and load these settings dynamically
 *
 * @returns new portAudio.AudioIO
 */
exports.createAudioInstance = async function createAudioInstance() {
    const selectedDevice = await this.confirmAudioDevice({deviceId: getDeviceID()});//{deviceName: "VoiceMeeter VAIO3 Output (VB-Au"});
    log.DEBUG("Device selected from config: ", selectedDevice);
    // Create an instance of AudioIO with outOptions (defaults are as below), which will return a WritableStream
    return new alsaInstance({        
        channels: 2,
        format: "S16_BE",
        rate: 48000,
        device: selectedDevice.name ?? "default",  // Use -1 or omit the deviceId to select the default device
        periodSize: 100,  //(48000 / 1000) * 20, //(48000 * 16 * 2) / 1000 * 20 // (48000 * (16 / 8) * 2) / 60 / 1000 * 20  //0.025 * 48000 / 2
        periodTime: undefined,
//        highwaterMark: 3840
    });
}