#!/bin/sh
# Build a .deb that pulls in every dependency through apt.
#
# Deliberately plain dpkg-deb rather than debhelper: everything this package
# needs is already in Debian, the payload is pure Python with no compiled
# parts, and this way the build needs nothing installed beyond dpkg itself.
set -eu

here=$(cd "$(dirname "$0")/.." && pwd)
version=$(cd "$here" && python3 -c 'import bandsaunter; print(bandsaunter.debian_version())')
revision=${DEB_REVISION:-1}
arch=all
stage=$(mktemp -d)
trap 'rm -rf "$stage"' EXIT

pkgdir="$stage/bandsaunter_${version}-${revision}_${arch}"
site="$pkgdir/usr/lib/python3/dist-packages"
mkdir -p "$site/bandsaunter" "$pkgdir/usr/bin" "$pkgdir/DEBIAN" \
         "$pkgdir/usr/share/doc/bandsaunter"

cp "$here"/bandsaunter/*.py "$site/bandsaunter/"
cp "$here/README.md" "$pkgdir/usr/share/doc/bandsaunter/"
gzip -9n "$pkgdir/usr/share/doc/bandsaunter/README.md"

cat > "$pkgdir/usr/bin/bandsaunter" <<'EOF'
#!/usr/bin/python3
import sys
from bandsaunter.cli import main
sys.exit(main())
EOF
chmod 755 "$pkgdir/usr/bin/bandsaunter"

# Every one of these is in Debian, so apt resolves the lot.  The speech
# recognisers are not packaged for Debian and can only come from pip, so they
# are suggested rather than depended on -- transcription is off by default and
# says so plainly when no recogniser is present.
cat > "$pkgdir/DEBIAN/control" <<EOF
Package: bandsaunter
Version: ${version}-${revision}
Section: hamradio
Priority: optional
Architecture: ${arch}
Depends: python3 (>= 3.10), python3-numpy, python3-scipy, python3-rich,
 python3-yaml, librtlsdr0
Recommends: espeak-ng
Suggests: rtl-sdr
Maintainer: bandsaunter
Installed-Size: $(du -ks "$pkgdir" | cut -f1)
Description: signal scanner and recorder for RTL-SDR receivers
 Sweeps any set of frequency ranges, or presets from a built-in US band plan,
 records what it finds and works out what kind of signal it was.
 .
 Captures are kept only if they carry voice, decodable CW or an identified
 digital keying scheme, so static and interference are discarded rather than
 filling the disk. CW is decoded to text, and speech can be transcribed when
 a recogniser is installed.
EOF

cat > "$pkgdir/DEBIAN/postinst" <<'EOF'
#!/bin/sh
set -e
if [ "$1" = configure ]; then
    # The DVB-T driver claims the dongle on sight and has to be kept off it.
    if [ ! -e /etc/modprobe.d/blacklist-rtlsdr.conf ]; then
        echo 'blacklist dvb_usb_rtl28xxu' > /etc/modprobe.d/blacklist-rtlsdr.conf
        echo 'bandsaunter: blacklisted dvb_usb_rtl28xxu; unplug and replug the'
        echo '             receiver, or run: sudo rmmod dvb_usb_rtl28xxu'
    fi
fi
exit 0
EOF
chmod 755 "$pkgdir/DEBIAN/postinst"

cat > "$pkgdir/DEBIAN/prerm" <<'EOF'
#!/bin/sh
set -e
if [ "$1" = remove ] || [ "$1" = purge ]; then
    rm -f /etc/modprobe.d/blacklist-rtlsdr.conf
fi
exit 0
EOF
chmod 755 "$pkgdir/DEBIAN/prerm"

out=${1:-$here/dist}
mkdir -p "$out"
fakeroot dpkg-deb --build "$pkgdir" "$out" >/dev/null
echo "$out/bandsaunter_${version}-${revision}_${arch}.deb"