#!/bin/bash

XDG_CONFIG_HOME="${HOME}/.config"

PATH="/opt/homebrew/bin:$PATH"
PROJECTS_HOME="${HOME}/Projects"
DOTFILES_REPO="https://github.com/pvande/dotfiles"
DOTFILES_HOME="${PROJECTS_HOME}/dotfiles"

abort() {
  echo '‼️ ' "$@" "See $LOGFILE for details."
  exit 1
}

announce() {
  echo '📢 ' "$@"
}

warn() {
  echo '⛔️ ' "$@"
}

info() {
  echo '💡 ' "$@"
}

good() {
  echo '✅ ' "$@"
}

installed() {
  $BINDIR/brew ls $@ &>/dev/null
}

postinstall() {
  local var="postinstall_$1"
  [ "${!var}" != '-' ] && {
    echo "❗️ " "$1 Caveats"
    {
      if [ -z "${!var}" ]; then
        brew info $1 | sed '/==> Caveats/,/==>/!d;//d'
      else
        echo -ne "${!var}"
      fi
    } | sed -e 's/^/   /'
  }
}

ensure-line-in-file() {
  local file="$1"
  shift
  local line="$*"

  grep -qs "$line" "$file" || echo "$line" >> "$file"
}

global-gitignore() {
  ensure-line-in-file "${XDG_CONFIG_HOME}/git/ignore" $*
}

TMPDIR=$(mktemp -d)

announce "Configuring $(hostname -s)"

announce "Please make sure you're signed in to the App Store!"
echo -n "Press Enter to continue..."
read

sudo_xcode_tools="[ ! -x $('/usr/bin/xcode-select' -print-path 2>/dev/null || echo '/dev/null')/usr/bin/git ]"
sudo_homebrew="[ ! $(which brew) ]"

if ($sudo_xcode_tools) || ($sudo_homebrew); then
  warn "Super-user privileges are required for the following changes:"
  $sudo_xcode_tools && warn "  Installing the Xcode Command Line Tools"
  $sudo_homebrew && warn "  Installing Homebrew"
  sudo -k
  sudo -v

  if $sudo_xcode_tools; then
    info "Installing the Xcode Command Line Tools..."
    sudo touch /tmp/.com.apple.dt.CommandLineTools.installondemand.in-progress

    package="$(softwareupdate -l | grep -E "[*] Label: Command Line (Developer|Tools)" | awk -F": " '{print $2}' | tail -n1)"
    if [ -z "$package" ]; then
      abort "Could not find XCode Tools package!"
    else
      sudo /usr/sbin/softwareupdate -i "$package" &>/dev/null
    fi

    sudo rm -f /tmp/.com.apple.dt.CommandLineTools.installondemand.in-progress
    sudo '/usr/bin/xcode-select' --switch /Library/Developer/CommandLineTools &>/dev/null
  fi

  if $sudo_homebrew; then
    info "Installing Homebrew..."
    /bin/bash -c "NONINTERACTIVE=1 $(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/HEAD/install.sh)"
  fi

  info "Releasing super-user privileges."
  sudo -k
fi

good "Xcode Command Line Tools are present..."
good "Homebrew is installed and present..."
eval "$(brew shellenv)"

LOGFILE="${TMPDIR}/dotfiles.log"
if [ ! -d $PROJECTS_HOME/dotfiles ]; then
  info "Cloning $DOTFILES_REPO to $DOTFILES_HOME..."
  {
    git clone $DOTFILES_REPO $DOTFILES_HOME
  } &>$LOGFILE || abort "Could not clone $DOTFILES_REPO!"
elif !(cd $DOTFILES_HOME && git fetch -q && git status | grep -q "Your branch is up to date with 'origin/master'"); then
  info "Updating $DOTFILES_HOME..."
  {
    cd $DOTFILES_HOME &&
    git merge origin/master
  } &>$LOGFILE || abort "Could not update $DOTFILES_REPO!"
fi
good "dotfiles repository is up-to-date..."

for sh in $DOTFILES_HOME/config/*.sh ; do
  [ -r "${sh}" ] && LOGFILE="${TMPDIR}/$(basename "$sh" .sh).log" source "${sh}"
done
unset sh

for cmd in $(brew list --formulae); do
  if (brew info $cmd | grep -q Caveats); then
    postinstall $cmd
  fi
done

for cmd in $(brew list --casks); do
  if (brew info homebrew/cask/$cmd | grep -q Caveats); then
    postinstall homebrew/cask/$cmd
  fi
done

rm -r $TMPDIR
announce "All set!"