#!/bin/bash

# omarchy:summary=Set up fingerprint authentication for sudo, polkit, and lock screen
# omarchy:requires-sudo=true

set -e


check_fingerprint_hardware() {
  # Get fingerprint devices for the user
  devices=$(fprintd-list "$USER" 2>/dev/null)

  # Exit if no devices found
  if [[ -z $devices ]]; then
    echo -e "\e[31m\nNo fingerprint sensor detected.\e[0m"
    return 1
  fi
  return 0
}

setup_pam_config() {
  # Configure sudo
  if ! grep -q pam_fprintd.so /etc/pam.d/sudo; then
    echo "Configuring sudo for fingerprint authentication..."
    sudo sed -i '1i auth    sufficient pam_fprintd.so' /etc/pam.d/sudo
  fi

  # Configure polkit
  if [[ -f /etc/pam.d/polkit-1 ]] && ! grep -q 'pam_fprintd.so' /etc/pam.d/polkit-1; then
    echo "Configuring polkit for fingerprint authentication..."
    sudo sed -i '1i auth      sufficient pam_fprintd.so' /etc/pam.d/polkit-1
  elif [[ ! -f /etc/pam.d/polkit-1 ]]; then
    echo "Creating polkit configuration with fingerprint authentication..."
    sudo tee /etc/pam.d/polkit-1 >/dev/null <<'EOF'
auth      sufficient pam_fprintd.so
auth      required pam_unix.so

account   required pam_unix.so
password  required pam_unix.so
session   required pam_unix.so
EOF
  fi
}

setup_lock_fingerprint_pam() {
  echo "Configuring lock screen for fingerprint authentication..."
  sudo tee /etc/pam.d/omarchy-lock-fingerprint >/dev/null <<'EOF'
#%PAM-1.0
auth       required                    pam_fprintd.so
account    include                     system-local-login
EOF
}


echo -e "\e[32mSetting up fingerprint scanner for authentication.\n\e[0m"

# Install required packages
echo "Installing required packages..."

# libfprint-git provides+conflicts libfprint; pacman -S --noconfirm
# defaults the conflict prompt to N and aborts. Pre-remove libfprint
# with -Rdd so the install goes silent. -Rdd (not omarchy-pkg-drop's
# -Rns) is required because fprintd requires libfprint; the dep is
# re-satisfied immediately by libfprint-git's provides=libfprint.
if omarchy-pkg-present libfprint; then
  sudo pacman -Rdd --noconfirm libfprint
fi

omarchy-pkg-add libfprint-git fprintd usbutils

if ! check_fingerprint_hardware; then
  exit 1
fi

# Configure PAM
setup_pam_config

# Enroll first fingerprint
echo -e "\e[32m\nLet's setup your right index finger as the first fingerprint.\e[0m"
echo -e "Keep moving the finger around on sensor until the process completes.\n"

if sudo fprintd-enroll "$USER"; then
  echo -e "\e[32m\nFingerprint enrolled successfully!\e[0m"

  # Verify
  echo -e "\nNow let's verify that it's working correctly.\n"
  if fprintd-verify; then
    setup_lock_fingerprint_pam
    echo -e "\e[32m\nPerfect! Fingerprint authentication is now configured.\e[0m"
    echo "You can use your fingerprint for sudo, polkit, and lock screen (Super + Ctrl + L)."
  else
    echo -e "\e[31m\nVerification failed. You may want to try enrolling again.\e[0m"
  fi
else
  echo -e "\e[31m\nEnrollment failed. Please try again.\e[0m"
  exit 1
fi