#!/usr/bin/env bash
# @file Homebrew / Xcode Tools Installation
# @brief Ensures Xcode tools are installed on macOS and ensures Homebrew is installed on either Linux or macOS
# @description
#     This script ensures macOS has tools like `git` by installing the Xcode command-line developer tools if they are
#     not already installed. Then, on both Linux and macOS, it ensures Homebrew is installed.
#
#     It also tries to perform a system update and there may be some manual work required since it is not possible
#     to completely automate the system update process for macOS.
#
#     ## Environment Variables
#
#     * `NO_RESTART` - Set this variable to skip restarts triggered by system updates on macOS
#
#     ## Homebrew Requirement
#
#     Install Doctor relies on Homebrew for many tools that are currently only available via Homebrew. Removing the dependency
#     would be a nice-to-have but there are currently no plans for supporting systems without Homebrew installed.

{{ includeTemplate "universal/profile-before" }}
{{ includeTemplate "universal/logg-before" }}

# @description This script ensures all the system utilities necessary to install Homebrew are present on the system.
ensureHomebrewDeps() {
  if ! command -v curl > /dev/null || ! command -v git > /dev/null || ! command -v expect > /dev/null || ! command -v rsync > /dev/null; then
    if command -v apt-get > /dev/null; then
      # @description Ensure `build-essential`, `curl`, `expect`, `git`, `rsync`, `procps`, and `file` are installed on Debian / Ubuntu
      sudo apt-get update
      sudo apt-get install -y build-essential curl expect git rsync procps file
    elif command -v dnf > /dev/null; then
      # @description Ensure `curl`, `expect`, `git`, `rsync`, `procps-ng`, and `file` are installed on Fedora (as well as the Development Tools package)
      sudo dnf groupinstall -y 'Development Tools'
      sudo dnf install -y curl expect git rsync procps-ng file
    elif command -v yum > /dev/null; then
      # @description Ensure `curl`, `expect`, `git`, `rsync`, `procps-ng`, and `file` are installed on CentOS (as well as the Development Tools package)
      sudo yum groupinstall -y 'Development Tools'
      sudo yum install -y curl expect git rsync procps-ng file
    elif command -v pacman > /dev/null; then
      # @description Ensure `base-devel`, `curl`, `expect`, `git`, `rsync`, `procps-ng`, and `file` are installed on Archlinux
      sudo pacman update
      sudo pacman -Sy base-devel curl expect git rsync procps-ng file
    elif command -v zypper > /dev/null; then
      # @description Ensure `curl`, `expect`, `git`, `rsync`, `procps`, and `file` are installed on OpenSUSE (as well as the devel_basis pattern)
      sudo zypper install -yt pattern devel_basis
      sudo zypper install -y curl expect git rsync procps file
    elif command -v apk > /dev/null; then
      # @description Ensure `curl`, `expect`, `git`, `rsync`, `procps`, and `file` are installed on Alpine
      apk add build-base curl expect git rsync procps file
    elif [ -d /Applications ] && [ -d /Library ]; then
      # @description Ensure CLI developer tools are available on macOS (via `xcode-select`)
      sudo xcode-select -p >/dev/null 2>&1 || xcode-select --install
    elif [[ "$OSTYPE" == 'cygwin' ]] || [[ "$OSTYPE" == 'msys' ]] || [[ "$OSTYPE" == 'win32' ]]; then
      # @description Ensure `curl`, `expect`, `git`, and `rsync` are installed on Windows
      choco install -y curl expect git rsync
    fi
  fi
}

# @description This script ensures Homebrew is installed.
ensurePackageManagerHomebrew() {
  if ! command -v brew > /dev/null; then
    if command -v sudo > /dev/null && sudo -n true; then
      echo | bash -c "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/HEAD/install.sh)"
    else
      logg info 'Homebrew is not installed. Password may be required.'
      bash -c "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/HEAD/install.sh)" || BREW_EXIT_CODE="$?"
      if [ -n "$BREW_EXIT_CODE" ]; then
        logg warn 'Homebrew was installed but part of the installation failed to complete successfully.'
        if command -v brew > /dev/null; then
          logg info 'Applying proper permissions on Homebrew folders'
          sudo chmod -R go-w "$(brew --prefix)/share"
          BREW_DIRS="share etc/bash_completion.d"
          for BREW_DIR in $BREW_DIRS; do
            if [ -d "$(brew --prefix)/$BREW_DIR" ]; then
              sudo chown -Rf "$(whoami)" "$(brew --prefix)/$BREW_DIR"
            fi
          done
          logg info 'Running brew update --force --quiet' && brew update --force --quiet
        fi
      fi
    fi
  fi
}

# @description Helper function utilized by [[upgradeDarwin]] to ensure the `expect` command is available on macOS
installExpect() {
  if ! command -v expect > /dev/null; then
    logg info 'Installing expect via Homebrew' && brew install expect
  fi
}

# @description Helper function utilized by [[upgradeDarwin]] to ensure the `gsed` command is available on macOS
installGsed() {
  if ! command -v gsed > /dev/null; then
    logg info 'Installing gnu-sed via Homebrew' && brew install gnu-sed
  fi
}

# @description Helper function utilized by [[upgradeDarwin]] to ensure the `gtimeout` command is available on macOS
installGtimeout() {
  if ! command -v gtimeout > /dev/null; then
    logg info 'Installing coreutils via Homebrew' && brew install coreutils
  fi
}

# @description This script ensures `expect` and `gsed` are available. It then either extracts the escalation password by decrypting the
#     `SUDO_PASSWORD` secret or prompts the user for the sudo password. After that, it automates the process of downloading
#     system updates, rebooting, and re-starting the provisioning process until the system is fully updated.
#
#     It may be important to note that although this script attempts to make the process fully automated, there may be
#     certain circumstances where additional user input is necessary during the process. This might be true in cases
#     where the system settings are controlled by MDM profiles for corporate laptops.
upgradeDarwin() {
  if [ -d /Applications ] && [ -d /Library ] && [ -z "$NO_RESTART" ]; then
    ### Ensure dependencies are installed
    installExpect
    installGsed
    installGtimeout

    ### Attempt to populate SUDO_PASSWORD from secrets
    if [ -z "$SUDO_PASSWORD" ]; then
      SUDO_PASSWORD="{{- if and (stat (joinPath .host.home ".config" "age" "chezmoi.txt")) (stat (joinPath .chezmoi.sourceDir ".chezmoitemplates" "secrets" "SUDO_PASSWORD")) -}}{{- includeTemplate "secrets/SUDO_PASSWORD" | decrypt | trim -}}{{- end -}}"
      export SUDO_PASSWORD
    fi

    ### Prompt for SUDO_PASSWORD
    if [ -z "$SUDO_PASSWORD" ] || [ "$SUDO_PASSWORD" = "" ]; then
      logg prompt "Enter the current user's login / admin password. Press ENTER to bypass and skip enabling auto-login. If you would like to bypass this prompt next time then pass in the password as an environment variable named SUDO_PASSWORD before running the kickstart script."
      SUDO_PASSWORD="$(gum input --password --placeholder="Enter password..")"
      export SUDO_PASSWORD
    fi

    ### Run upgrade process
    logg info 'Checking for available OS upgrades'
    UPDATE_CHECK="$(softwareupdate -l 2>&1)"
    if ! echo "$UPDATE_CHECK" | grep "No new software available" > /dev/null; then
      logg info 'There are available OS upgrades'
      echo "$UPDATE_CHECK"
      logg info 'Applying OS upgrades (if available). This may take awhile..'
      expect -c "set timeout -1
      spawn sudo softwareupdate -i -a --agree-to-license
      expect \"Password:\"
      send \"${SUDO_PASSWORD}\r\"
      expect eof" &> /dev/null || EXIT_CODE=$?
      if [ -n "$EXIT_CODE" ]; then
        logg warn 'Error running softwareupdate'
        unset EXIT_CODE
      fi
      # sudo sh -c "sudo softwareupdate -i -a --agree-to-license" || logg error 'Failed to trigger a system update via sudo softwareupdate -i -a --agree-to-license'

      ### Reboot if necessary
      # Source: https://community.jamf.com/t5/jamf-pro/determine-if-update-requires-restart/m-p/11682
      logg info 'Checking if softwareupdate requires a reboot'
      if softwareupdate -l | grep restart > /dev/null; then
        ### Add kickstart script to .zshrc so it triggers automatically
        if [ ! -f "$HOME/.zshrc" ] || ! cat "$HOME/.zshrc" | grep '# TEMPORARY FOR INSTALL DOCTOR MACOS' > /dev/null; then
          logg info 'Adding kickstart script to ~/.zshrc so script continues automatically if reboot is necessary'
          echo 'bash <(curl -sSL --compressed https://install.doctor/start) # TEMPORARY FOR INSTALL DOCTOR MACOS' >> "$HOME/.zshrc"
        fi

        if [ -n "$SUDO_PASSWORD" ] && [ "$SUDO_PASSWORD" != "" ]; then
          ### Install kcpassword
          if ! command -v enable_autologin > /dev/null; then
            logg info 'enable_autologin is not installed and it is a requirement for auto-logging in after reboot' && brew install xfreebird/utils/kcpassword
          fi

          ### Enable auto-login via kcpassword
          logg info "Enabling autologin for $USER with acquired sudo password" && sudo enable_autologin "$USER" "$SUDO_PASSWORD"
        fi

        ### Reboot
        logg info 'Reboot required' && exit 140
      else
        logg info 'No reboot required for softwareupdate'
      fi
    else
      logg info 'There are no available OS upgrades'
    fi

    if [ -f "$HOME/.zshrc" ]; then
      logg info 'Ensuring provision kickstart script is removed from ~/.zshrc'
      if command -v gsed > /dev/null; then
        sudo gsed -i '/# TEMPORARY FOR INSTALL DOCTOR MACOS/d' "$HOME/.zshrc" || logg warn "Failed to remove kickstart script from .zshrc"
      else
        sudo sed -i '/# TEMPORARY FOR INSTALL DOCTOR MACOS/d' "$HOME/.zshrc" || logg warn "Failed to remove kickstart script from .zshrc"
      fi
    fi
  fi
}

# @description This script attempts to load Homebrew by checking in typical locations.
loadHomebrew() {
  if ! command -v brew > /dev/null; then
    if [ -f /usr/local/bin/brew ]; then
      eval "$(/usr/local/bin/brew shellenv)"
    elif [ -f "${HOMEBREW_PREFIX:-/opt/homebrew}/bin/brew" ]; then
      eval "$("${HOMEBREW_PREFIX:-/opt/homebrew}/bin/brew" shellenv)"
    elif [ -d "$HOME/.linuxbrew" ]; then
      eval "$("$HOME/.linuxbrew/bin/brew" shellenv)"
    elif [ -d "/home/linuxbrew/.linuxbrew" ]; then
      eval "(/home/linuxbrew/.linuxbrew/bin/brew shellenv)"
    fi
  fi
}

### Logic sequence
ensureHomebrewDeps
loadHomebrew
ensurePackageManagerHomebrew
loadHomebrew
upgradeDarwin