#!/bin/sh
# scrubadubber installer (macOS).
#
#   curl -fsSL https://scrubadubber.com/install.sh | sh
#
# Downloads the latest scrubadubber.dmg from GitHub Releases, verifies its
# SHA-256 against checksums.txt, installs the app into /Applications, and opens
# it. It does nothing else — read it first; that is the whole point of this
# project.
#
# Override (optional):
#   SCRUBADUBBER_VERSION   release tag to install (default: latest)
set -eu

REPO="salehkreiner/scrubadubber"
ASSET="scrubadubber.dmg"
VERSION="${SCRUBADUBBER_VERSION:-latest}"
if [ "$VERSION" = "latest" ]; then
	BASE="https://github.com/$REPO/releases/latest/download"
else
	BASE="https://github.com/$REPO/releases/download/$VERSION"
fi

err() { printf 'install.sh: error: %s\n' "$*" >&2; exit 1; }

os=$(uname -s 2>/dev/null || echo unknown)
[ "$os" = "Darwin" ] || err "this installer is macOS-only (detected '$os'); on Windows use install.ps1"

tmp=$(mktemp -d)
mnt=""
cleanup() {
	[ -n "$mnt" ] && hdiutil detach "$mnt" -quiet >/dev/null 2>&1 || true
	rm -rf "$tmp"
}
trap cleanup EXIT

echo "Downloading $ASSET ..."
curl -fSL --proto '=https' --tlsv1.2 -o "$tmp/$ASSET"         "$BASE/$ASSET"
curl -fSL --proto '=https' --tlsv1.2 -o "$tmp/checksums.txt"  "$BASE/checksums.txt"

# checksums.txt is shasum -a 256 format: "<hash>  <filename>"
expected=$(awk -v a="$ASSET" '$2==a || $2=="*"a {print $1; exit}' "$tmp/checksums.txt")
[ -n "$expected" ] || err "no checksum entry for $ASSET in checksums.txt"
actual=$(shasum -a 256 "$tmp/$ASSET" | awk '{print $1}')
[ "$expected" = "$actual" ] || err "checksum mismatch for $ASSET (expected $expected, got $actual)"
echo "Checksum verified."

echo "Mounting $ASSET ..."
mnt=$(hdiutil attach -nobrowse -noverify -noautoopen "$tmp/$ASSET" | sed -n 's:.*\(/Volumes/.*\):\1:p' | head -1)
[ -n "$mnt" ] || err "could not mount $ASSET"

app=$(find "$mnt" -maxdepth 1 -name '*.app' | head -1)
[ -n "$app" ] || err "no .app found inside $ASSET"
name=$(basename "$app")

echo "Installing $name to /Applications ..."
rm -rf "/Applications/$name"
cp -R "$app" "/Applications/" || err "could not copy to /Applications (try running with sudo)"

hdiutil detach "$mnt" -quiet >/dev/null 2>&1 || true
mnt=""

echo "Launching $name ..."
open "/Applications/$name" || true

echo ""
echo "Done. scrubadubber is installed in /Applications."