#!/usr/bin/env bash
# patches the signal install so every launch loads signalpwm
#   ./install.sh              patch
#   ./install.sh --uninstall  restore the original
set -euo pipefail

project="$(cd "$(dirname "$0")" && pwd)"
resources=/usr/lib/signal-desktop/resources
data="${XDG_DATA_HOME:-$HOME/.local/share}/signalpwm"
orig="$data/orig"

if [[ "${1:-}" == "--uninstall" ]]; then
  sudo install -m644 "$orig/app.asar" "$resources/app.asar"
  echo "Restored original Signal."; exit 0
fi

# signal loads the code from this copy
mkdir -p "$data"
if [[ -L "$data/src" ]]; then
  echo "keeping src symlink $data/src"
else
  rm -rf "$data/src" && cp -r "$project/src" "$data/src"
fi

# after a signal update app.asar is clean again
mkdir -p "$orig"
if ! grep -qa signalpwm "$resources/app.asar"; then
  cp "$resources/app.asar" "$orig/app.asar"
elif [[ ! -f "$orig/app.asar" ]]; then
  echo "signal is already patched but no backup exists in $orig" >&2; exit 1
fi
# asar finds the native modules next to the asar, so link them beside this copy
ln -sfn "$resources/app.asar.unpacked" "$orig/app.asar.unpacked"

work="$(mktemp -d)"
trap 'rm -rf "$work"' EXIT

npx --yes @electron/asar extract "$orig/app.asar" "$work/app"
cat >> "$work/app/bundles/preload/wrapper.js" <<JS

;try{require(${data@Q}+'/src')}catch(e){console.error('[signalpwm] load failed',e)}
JS
npx --yes @electron/asar pack "$work/app" "$work/app.asar" --unpack "*.node"

sudo install -m644 "$work/app.asar" "$resources/app.asar"
# builtin themes/plugins are replaced on every install
config="${XDG_CONFIG_HOME:-$HOME/.config}/signalpwm"
for kind in themes plugins; do
  rm -rf "$config/$kind"
  mkdir -p "$config/$kind" "$config/custom_$kind"
  cp -r "$project/builtin/$kind/." "$config/$kind/"
done

echo "signalpwm is now installed :3 restart signal!"