#!/usr/bin/env bash

set -Eeuo pipefail

# Runtime environment
source /etc/os-release
if [[ "${ID:-}" != "debian" || "${VERSION_ID:-}" != "13" ]]; then
    echo "Error: this script supports Debian 13 only." >&2
    exit 1
fi

# Ensure interactive login shells can find system administration commands.
USR_SBIN_PROFILE=/etc/profile.d/usr-sbin-path.sh
if [[ ! -e "${USR_SBIN_PROFILE}" ]]; then
    sudo tee "${USR_SBIN_PROFILE}" >/dev/null <<'EOF'
case ":${PATH}:" in
    *:/usr/sbin:*) ;;
    *) export PATH="${PATH}:/usr/sbin" ;;
esac
EOF
    sudo chmod 0644 "${USR_SBIN_PROFILE}"
    echo "Configured ${USR_SBIN_PROFILE}."
fi

# Prevent /tmp from being mounted as a tmpfs
sudo systemctl mask tmp.mount

# Window title bar buttons
gsettings set org.gnome.desktop.wm.preferences button-layout \
    ':minimize,maximize,close'

# Show the weekday and seconds in the desktop clock
gsettings set org.gnome.desktop.interface clock-show-weekday true
gsettings set org.gnome.desktop.interface clock-show-seconds true

# Set the idle timeout to 30 minutes
gsettings set org.gnome.desktop.session idle-delay 'uint32 1800'

# Use touch-style scrolling direction for the mouse
gsettings set org.gnome.desktop.peripherals.mouse natural-scroll true

# Disable Caps Lock
# gsettings set org.gnome.desktop.input-sources xkb-options "['caps:none']"
# Enable Caps Lock to toggle between keyboard layouts
gsettings set org.gnome.desktop.input-sources xkb-options "['grp:caps_toggle']"

# Disable GNOME Software update checks, downloads, and notifications
gsettings set org.gnome.software allow-updates false
gsettings set org.gnome.software download-updates false
gsettings set org.gnome.software download-updates-notify false

# Install Dash to Dock
sudo apt-get install -y gnome-shell-extension-dashtodock

# Keep the Dash visible
gsettings set org.gnome.shell.extensions.dash-to-dock dock-fixed true
gsettings set org.gnome.shell.extensions.dash-to-dock autohide false
gsettings set org.gnome.shell.extensions.dash-to-dock intellihide false

# Do not open the Activities Overview automatically after login
gsettings set org.gnome.shell.extensions.dash-to-dock \
    disable-overview-on-startup true

# Dash click behavior
gsettings set org.gnome.shell.extensions.dash-to-dock click-action \
    'focus-minimize-or-appspread'

# Show one running indicator dot per application window
gsettings set org.gnome.shell.extensions.dash-to-dock \
    running-indicator-style 'DOTS'

# Install AppIndicator
sudo apt-get install -y gnome-shell-extension-appindicator

# Enable GNOME extensions
gsettings set org.gnome.shell enabled-extensions \
    "['dash-to-dock@micxgx.gmail.com', 'ubuntu-appindicators@ubuntu.com']"

echo "GNOME desktop configuration completed. Log out and back in if a newly installed extension is not visible."