#!/usr/bin/env sh
set -eu

BASE_URL="${FIELDLENS_DOWNLOAD_BASE_URL:-https://git.arrowstack.dev/Admin/fieldlens-desktop/raw/branch/main/downloads}"
PACKAGE="fieldlens-print-linux-x64.deb"
EXPECTED_SHA256="a95768acd7084bdc1a50ff5f72e4a69ffc4f9821fc51e13e54e76c7abb57ab84"

say() {
  printf '%s\n' "$*"
}

fail() {
  printf 'FieldLens Print installer: %s\n' "$*" >&2
  exit 1
}

case "$(uname -m)" in
  x86_64|amd64) ;;
  *) fail "this installer currently supports x86_64/amd64 Linux only" ;;
esac

command -v sha256sum >/dev/null 2>&1 || fail "sha256sum is required"

tmpdir="$(mktemp -d 2>/dev/null || mktemp -d -t fieldlens-print)"
trap 'rm -rf "$tmpdir"' EXIT HUP INT TERM
package_path="$tmpdir/$PACKAGE"
package_url="$BASE_URL/$PACKAGE"

say "Downloading FieldLens Print..."

if command -v curl >/dev/null 2>&1; then
  curl -fL --retry 3 --retry-delay 1 -o "$package_path" "$package_url"
elif command -v wget >/dev/null 2>&1; then
  wget -O "$package_path" "$package_url"
else
  fail "curl or wget is required"
fi

actual_sha256="$(sha256sum "$package_path" | awk '{print $1}')"
if [ "$actual_sha256" != "$EXPECTED_SHA256" ]; then
  fail "checksum verification failed"
fi

say "Checksum verified."

if [ "$(id -u)" -eq 0 ]; then
  sudo_cmd=""
elif command -v sudo >/dev/null 2>&1; then
  sudo_cmd="sudo"
else
  fail "root access or sudo is required to install the package"
fi

if command -v apt-get >/dev/null 2>&1; then
  say "Installing CUPS printer tools..."
  $sudo_cmd apt-get update
  $sudo_cmd apt-get install -y cups-client policykit-1 || $sudo_cmd apt-get install -y cups-client
  say "Installing FieldLens Print..."
  $sudo_cmd apt-get install -y "$package_path"
elif command -v apt >/dev/null 2>&1; then
  say "Installing CUPS printer tools..."
  $sudo_cmd apt update
  $sudo_cmd apt install -y cups-client policykit-1 || $sudo_cmd apt install -y cups-client
  say "Installing FieldLens Print..."
  $sudo_cmd apt install -y "$package_path"
elif command -v dpkg >/dev/null 2>&1; then
  say "Installing FieldLens Print..."
  $sudo_cmd dpkg -i "$package_path"
else
  fail "this installer currently supports Debian/Ubuntu-style systems"
fi

say "FieldLens Print installed successfully."