#!/usr/bin/env bash

## An idempotent system configuration script.
##
## Usage: configure
##
## Dependencies: Fedora 42
##
## I run this script after performing a minimal installation of Fedora Linux,
## and I run it daily thereafter.

set -euo pipefail
shopt -s inherit_errexit

die() { echo "$(basename "$0"): $1" >&2; exit 1; }

[[ " $* " =~ ' --help ' ]] && sed -n 's/^## \?//p' "$0" && exit
(( UID != 0 )) || die 'do not run as root'

# Add user to groups.
sudo gpasswd -a "$USER" lp
echo

# Create directories.
mkdir -p ~/{.cache,.local/{bin,lib,share,state},pending}
sudo mkdir -p /media/{cdrom,samsung-128gb,wd-25a2-2tb,wd-25e2-2tb-{1,2}}

# Add file systems to fstab.
fstab_text=$(< /etc/fstab)
fstab_update=$(<<-EOF
	UUID=48f7a023-824c-4e34-bc79-fb95ffd767c4 /media/wd-25a2-2tb      ext4    nofail,noatime  0 2
	UUID=0f7ada7d-8766-4712-8cea-d010a98f5437 /media/wd-25e2-2tb-1    ext4    nofail,noatime  0 2
	UUID=f1f754ca-6f6b-42ae-a037-c25a1fd6a253 /media/wd-25e2-2tb-2    btrfs   nofail,noatime  0 2
	UUID=7746-0C3C                            /media/samsung-128gb    exfat   nofail          0 0
	/dev/sr0                                  /media/cdrom            auto    nofail,ro,user  0 0
	EOF
)
if [[ ! $fstab_text =~ $fstab_update ]]; then
  echo 'Adding file systems to fstab...'
  sudo tee -a /etc/fstab <<< "$fstab_update" > /dev/null
  sudo systemctl daemon-reload # Must be run after modifying fstab.
  echo
fi

# Restore files from backup.
if [[ ! -d ~/main ]]; then
  if [[ -d /media/wd-25e2-2tb-2/backups/latest ]]; then
    backup=/media/wd-25e2-2tb-2/backups/latest
  elif [[ -d /media/cdrom/main ]]; then
    backup=/media/cdrom # The backup I restore when testing this script on a VM.
  else
    die 'backup not found'
  fi
  echo 'Restoring files from backup...'
  cp -aT "$backup" ~
  [[ $backup == /media/cdrom ]] && chmod -R +rw ~
  echo
fi

# Configure DNF.
dnfconf_text=$(< /etc/dnf/dnf.conf)
dnfconf_update='install_weak_deps=False'
if [[ ! $dnfconf_text =~ $dnfconf_update ]]; then
  sudo tee -a /etc/dnf/dnf.conf <<< "$dnfconf_update" > /dev/null
fi

echo 'Upgrading RPMs...'
sudo dnf upgrade
echo

echo "Enabling RPM Fusion's package repos..."
fedora_version=$(rpm -E %fedora)
dnf list --installed rpmfusion-free-release > /dev/null || sudo dnf install \
  https://mirrors.rpmfusion.org/free/fedora/rpmfusion-free-release-"$fedora_version".noarch.rpm
dnf list --installed rpmfusion-nonfree-release > /dev/null || sudo dnf install \
  https://mirrors.rpmfusion.org/nonfree/fedora/rpmfusion-nonfree-release-"$fedora_version".noarch.rpm
sudo dnf install rpmfusion-free-release-tainted rpmfusion-nonfree-release-tainted
echo

echo 'Installing RPMs from RPM Fusion...'
sudo dnf install ffmpeg
echo

echo 'Installing RPMs from the fedora-cisco-openh264 repo...'
sudo dnf install mozilla-openh264
echo

echo "Installing RPMs from Fedora's main package repo..."
main_rpms=(
  altermime bash-completion cups darkhttpd dunst emacs-gtk+x11 epiphany evince
  fd-find fontconfig fzf gimp git golang-github-tdewolff-minify gthumb
  ImageMagick inotify-tools maildir-utils mpg123 mpv nodejs nodejs-npm openbox
  pass pavucontrol pdfgrep printer-driver-brlaser qemu-img qemu-system-x86
  ripgrep rsms-inter-fonts rsync sane-backends ShellCheck sysstat tar tree unzip
  xdg-utils xinput xorg-x11-server-Xorg xorg-x11-xauth xorg-x11-xinit xorriso
  xterm zathura zathura-pdf-poppler
)
sudo dnf install "${main_rpms[@]}"
echo

# Install Chrome using Google's RPM package because the version of Chromium in
# Fedora's main package repo isn't always the latest.
if ! type google-chrome &> /dev/null; then
  echo "Installing Chrome using Google's RPM package..."
  curl -fLSo /tmp/chrome.rpm \
    https://dl.google.com/linux/direct/google-chrome-stable_current_x86_64.rpm
  sudo dnf install /tmp/chrome.rpm
  echo
fi

# Install Firefox using Mozilla's binary because the version of Firefox in
# Fedora's main package repo isn't always the latest.
read -rp "Install Firefox using Mozilla's binary? " input
if [[ $input =~ ^[Yy] ]]; then
  sudo dnf install dbus-glib # Install runtime dependency.
  curl -fLSo /tmp/firefox.tar.bz2 \
    'https://download.mozilla.org/?product=firefox-latest-ssl&os=linux64'
  sudo rm -rf /opt/firefox
  sudo tar -xf /tmp/firefox.tar.bz2 -C /opt
  sudo ln -sf /opt/firefox/firefox /usr/local/bin/firefox
fi
echo

# Install icopack using source code I previously downloaded.
if ! type icopack &> /dev/null; then
  echo 'Installing icopack from source...'
  make -C ~/main/i/icopack
  mv ~/main/i/icopack/icopack ~/.local/bin
  echo
fi

echo 'Removing RPMs that were dependencies but are no longer required...'
sudo dnf autoremove
echo

echo 'Removing cached RPMs...'
sudo dnf clean packages
echo

# Initialize mu's message database and index messages in my maildir.
if ! mu info &> /dev/null; then
  echo "Initializing mu's message database and indexing messages..."
  mu_init_opts=(--maildir="$HOME"/main/m/maildir)
  mapfile -t my_addresses < ~/main/m/maildir/my-addresses
  for line in "${my_addresses[@]}"; do
    [[ $line =~ @ ]] && mu_init_opts+=(--my-address="$line")
  done
  mu init "${mu_init_opts[@]}"
  mu index
fi

# Remove unwanted files.
rm -f ~/.bash_history # HISTFILE variable is set to a different path.
rm -f ~/.local/share/Trash/{files,info}/*