setup

#!/usr/bin/env bash
set -e -u

# Configurations
GHUSER=${GHUSER:-skatsuta}
REPO=${REPO:-ansible-macos}
DEST=${DEST:-${HOME}/src/github.com/${GHUSER}}
DIR="${DEST}/${REPO}"
SSH_KEY_TYPE=${SSH_KEY_TYPE:-ed25519}
SSH_KEY_PATH=$HOME/.ssh/id_$SSH_KEY_TYPE


# Show variables
show_variables() {
  echo "Configurations:"
  echo "    - Username:     ${GHUSER}"
  echo "    - Repository:   ${REPO}"
  echo "    - Destination:  ${DEST}"
  echo "    - SSH key type: ${SSH_KEY_TYPE}"
}

# Show ~/Library folder
configure() {
  echo "Setting to show ~/Library..."
  chflags nohidden ~/Library
  echo "Turning off startup chime..."
  sudo nvram SystemAudioVolume=" "
}

# Generate SSH Key
generate_ssh_key() {
  if [[ -f "$SSH_KEY_PATH" ]]; then
    echo "Your SSH key already exists."
    return
  fi

  echo "Generating a SSH key..."
  read -p "Type your email address: " email
  ssh-keygen -t "$SSH_KEY_TYPE" -C "$email"

  echo "Adding your SSH key to your ssh-agent..."
  eval "$(ssh-agent -s)"
  ssh-add "$SSH_KEY_PATH"
}

# Prompt the confirmation of adding the SSH key to GitHub
prompt_confirmation() {
  echo "Copying your SSH public key into your clipboard..."
  pbcopy < "$SSH_KEY_PATH.pub"

  echo "Now you should add the generated key to GitHub before proceeding."
  while true; do
    read -p "Are you sure you want to proceed? [Y/n] " yn
    case $yn in
      [Yy]*|'')
        echo "Proceeding..."
        break
        ;;
      [Nn]*)
        echo "Stopped."
        exit 1
        ;;
    esac
  done
}

# Install Command Line Tools
install_command_line_tools() {
  if [[ -d /Library/Developer/CommandLineTools ]]; then
    echo "Command Line Tools is already installed."
    return
  fi

  echo "Installing Command Line Tools..."
  echo "*** If a dialog is shown, push 'Install' button to install Command Line Tools before proceeding! ***"
  xcode-select --install
}

# Install Homebrew
install_homebrew() {
  if [[ -f /usr/local/bin/brew ]]; then
    echo "Homebrew is already installed."
    return
  fi

  echo "Installing Homebrew..."
  /bin/bash -c "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/HEAD/install.sh)"

  echo "Adding environment variables to $HOME/.zprofile..."
  local homebrew_home=/usr/local
  if [[ $(sysctl -n machdep.cpu.brand_string) =~ 'Apple' ]]; then
    homebrew_home=/opt/homebrew
  fi
  echo '# Homebrew' >> $HOME/.zprofile
  echo 'eval $('${homebrew_home}'/bin/brew shellenv)' >> $HOME/.zprofile
  eval $(${homebrew_home}/bin/brew shellenv)

  echo "Running 'brew doctor'..."
  brew doctor
}

# Install packages for running Ansible playbook
install_packages_for_ansible() {
  echo "Installing packages for running Ansible..."
  brew install git ansible
}

# Clone my GitHub repository
clone_repo() {
  if [[ -d "${DIR}" ]]; then
    echo "Repository already exists."
    return
  fi

  git clone git@github.com:${GHUSER}/${REPO}.git ${DIR}
  cd ${DIR}
}

# Provision
provision() {
  #cd ${DEST}/${REPO}
  #echo "Start provisioning..."
  #ansible-playbook playbook.yml

  echo "Initialization has been completed successfully."
  echo "To start provisioning, run"
  echo
  echo "  \$ cd ${DIR}"
  echo '  $ ansible-playbook playbook.yml'
}

# Run the above functions
run() {
  show_variables
  configure
  generate_ssh_key
  prompt_confirmation
  install_command_line_tools
  install_homebrew
  install_packages_for_ansible
  clone_repo
  provision
}

run