sub_api_login() {
  require_binary jq

  if [ -n $1 ]; then
    USERID="$1"
  else
    read -rp "User ID (format: @bot:example.com): " USERID
  fi
  if [ -n $2 ]; then
    DISPLAY_NAME="$2"
  else
    read -rp "Display name (e.g. Matrix Bot): " DISPLAY_NAME
  fi
  if [ -n $3 ]; then
    PASSWORD="$3"
  else
    read -rp "Password: " PASSWORD
  fi
  if [ -n $4 ]; then
    USER_HOMESERVER="$4"
  else
  read -rp "User homeserver (e.g. matrix.example.com): " USER_HOMESERVER
  fi

  USERNAME=$(echo "${USERID/@/}" | cut -d':' -f1)

  AUTH_DATA="{
  \"identifier\": { \"type\": \"m.id.user\", \"user\": \"$USERNAME\" },
  \"password\": \"$PASSWORD\",
  \"type\": \"m.login.password\"
}"

  debug "Auth data:
$AUTH_DATA"

  AUTH_RESPONSE=$(curl -s -X POST --header 'Content-Type: application/json' -d "$AUTH_DATA" "https://$USER_HOMESERVER/_matrix/client/r0/login")

  TOKEN=$(echo "$AUTH_RESPONSE" | jq -r '.access_token')
  DEVICE_ID=$(echo "$AUTH_RESPONSE" | jq -r '.device_id')

  CONFIGURE_DATA="{
  \"UserId\": \"$USERID\",
  \"AccessToken\": \"$TOKEN\",
  \"HomeServerURL\": \"$DOMAIN\",
  \"DeviceId\": \"LSWJCPGUAZ\",
  \"Sync\": true,
  \"AutoJoinRooms\": true,
  \"DisplayName\": \"autono-bot\"
}"

  debug "Auth data:
$CONFIGURE_DATA"

  curl -s -X POST "https://$DOMAIN/admin/configureClient" --data-binary $CONFIGURE_DATA | jq
}

sub_api() {
  CMD="$1"
  if type "sub_api_$CMD" > /dev/null 2>&1; then
    # shellcheck disable=SC2086
    shift
    "sub_api_$CMD" "$@"
  else
    error "Subcommand 'sub_api_$CMD' not found"
  fi
}