import Shell from "@lib/shell";

export default class Network {

  public static async createInterface(inet: string, address: string): Promise<boolean> {
    // First, check if the interface already exists.
    const interfaces = await Shell.exec(`ip link show | grep ${inet}`, true)
    if (interfaces.includes(`${inet}`)) {
      console.error(`failed to create interface, ${inet} already exists!`)
      return false
    }

    const o2 = await Shell.exec(`ip address add dev ${inet} ${address}`)
    // check if it has any error
    if (o2 !== '') {
      console.error(`failed to assign ip to interface, ${o2}`)
      console.log(`removing interface ${inet} due to errors`)
      await Shell.exec(`ip link delete dev ${inet}`, true)
      return false
    }

    return true
  }

  public static async dropInterface(inet: string) {
    await Shell.exec(`ip link delete dev ${inet}`, true)
  }

  public static async defaultInterface(): Promise<string> {
    return await Shell.exec(`ip route list default | awk '{print $5}'`)
  }

  public static async checkInterfaceExists(inet: string): Promise<boolean> {
    return await Shell.exec(`ip link show | grep ${inet}`, true)
       .then((o) => o.trim() !== '')
  }

};