import { exec } from "child_process";

export interface InfraredTransmitOptions {
  /**
   * Frequency  IR carrier frequency in Hertz
   */
  frequency: number;
  /**
   * Intervals, such as '20,50,20,30'
   *
   * **Note:** Only patterns shorter than 2 seconds will be transmitted
   */
  pattern: number[];
}

/**
 * Transmit an infrared pattern.
 *
 * **Note:** This API can be used only on devices that have infrared transmitter
 */
export async function infraredTransmit(
  options: InfraredTransmitOptions
): Promise<void> {
  return new Promise<void>((resolve, reject) => {
    if (options.pattern.length === 0) {
      return reject(`Error: Pattern to transmit is empty`);
    }
    const command = `termux-infrared-transmit -f ${
      options.frequency
    } "${options.pattern.join(",")}"`;
    exec(command, (error, stdout, stderr) => {
      if (error) {
        return reject(`Error: ${error.message}`);
      }
      if (stderr) {
        return reject(`Error: ${stderr}`);
      }
      return resolve();
    });
  });
}