#!/data/data/com.termux/files/usr/bin/sh
set -eu

BASE_URL="${SIMD_SCANNER_INSTALL_URL:-https://termux-simd-installer.fogeboro.workers.dev}"
APP_DIR="${SIMD_SCANNER_DIR:-$HOME/termux-simd-scanner}"
LAUNCHER="$PREFIX/bin/simd-scanner"

say() { printf '\n==> %s\n' "$1"; }
fail() { printf '\nERROR: %s\n' "$1" >&2; exit 1; }

if [ -z "${PREFIX:-}" ] || [ ! -d "$PREFIX" ]; then
  fail "Run this inside Termux."
fi

fetch() {
  url="$1"
  out="$2"
  if command -v curl >/dev/null 2>&1; then
    curl -fsSL "$url" -o "$out"
  elif command -v wget >/dev/null 2>&1; then
    wget -qO "$out" "$url"
  else
    fail "Need curl or wget. Run: pkg install curl"
  fi
}

say "Refreshing Termux packages"
pkg update -y
pkg install -y nodejs clang termux-api curl iproute2

say "Creating app folder: $APP_DIR"
mkdir -p "$APP_DIR"

MANIFEST="$APP_DIR/.install-manifest"
fetch "$BASE_URL/bundle/manifest.txt" "$MANIFEST"

say "Downloading scanner files"
while IFS= read -r file; do
  [ -n "$file" ] || continue
  target="$APP_DIR/$file"
  mkdir -p "$(dirname "$target")"
  fetch "$BASE_URL/bundle/files/$file" "$target"
done < "$MANIFEST"

chmod +x "$APP_DIR/install-termux.sh" 2>/dev/null || true

say "Building native SIMD scanner"
cd "$APP_DIR"
npm run build:native

say "Creating launcher: $LAUNCHER"
cat > "$LAUNCHER" <<EOF
#!/data/data/com.termux/files/usr/bin/sh
cd "$APP_DIR"
exec npm start
EOF
chmod +x "$LAUNCHER"

say "Android permission note"
printf 'Install the Android app "Termux:API" from F-Droid/GitHub too, then grant nearby devices/location permissions if Android asks.\n'

say "Done"
printf 'Start the scanner with:\n  simd-scanner\n\n'
printf 'Open on the phone:\n  http://127.0.0.1:8787\n\n'