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#!/bin/bash

# Install/update ngrok, create a config, and launch ngrok

install_ngrok() {
  curl -sSL https://ngrok-agent.s3.amazonaws.com/ngrok.asc | sudo tee /etc/apt/trusted.gpg.d/ngrok.asc >/dev/null
  echo "deb https://ngrok-agent.s3.amazonaws.com buster main" | sudo tee /etc/apt/sources.list.d/ngrok.list
  sudo apt update && sudo apt install -y ngrok
}


update_ngrok() {
  if apt list --upgradable 2>/dev/null | grep -q "ngrok"; then
    echo "Updating ngrok..."
    install_ngrok
  fi
}


is_config_existing() {
    if [ -f ~/.config/ngrok/ngrok.yml ]; then
        return 0  # true
    else
        return 1  # false
    fi
}


is_valid_config() {
    output=$(ngrok config check 2>&1)
    if [[ "$output" =~ Valid[[:space:]]configuration[[:space:]]file[[:space:]]at[[:space:]].*\.config/ngrok/ngrok\.yml ]]; then
        return 0  # true
    else
        return 1  # false
    fi
}


make_template_config() {
    mkdir -p ~/.config/ngrok

    cat <<EOF > ~/.config/ngrok/ngrok.yml
version: "3"
agent:
    authtoken: ??????
tunnels:
    ngrok-tunnel:
        proto: http
        addr: 8080
        url: ????????
EOF
}


if command -v ngrok &>/dev/null; then
  update_ngrok
else
  read -p "ngrok is not installed. Install now? (y/n) " answer
  if [ "$answer" = "y" ] || [ "$answer" = "Y" ]; then
    echo "Installing ngrok..."
    install_ngrok
  else
    echo "Skipping ngrok installation."
    exit 1
  fi
fi


if ! is_config_existing; then
    make_template_config
    echo -e "Next, we'll add your ngrok authtoken and static url to the ngrok config. You'll find this data at:\n"
    echo -e "https://dashboard.ngrok.com/get-started/setup/linux\n"
    read -p "Press enter to open the config editor."
    nano ~/.config/ngrok/ngrok.yml
    echo -e "ngrok configuration file created.\n\n"
    read -p "Okay. It appears you're all set. Press enter to launch ngrok."
elif ! is_valid_config; then
    echo "ngrok configuration file is invalid. Please check the config file at ~/.config/ngrok/ngrok.yml."
    exit 1
fi

ngrok start ngrok-tunnel