#!/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.  No speech
# recogniser is packaged for Debian, so that part ships as its own package
# (built by build-repo.sh) and is recommended rather than depended on: apt
# pulls it in from the repository, and a bare "dpkg -i" of this file still
# installs, without transcription.
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: bandsaunter-transcribe, 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

    # Said once, at install time, only when there is genuinely nothing to
    # transcribe with -- otherwise the recogniser package has already
    # arrived and there is nothing to explain.
    if ! python3 -c 'import importlib.util as u, sys
sys.path.append("/usr/lib/bandsaunter/vendor")
try:
    found = any(u.find_spec(m) for m in
                ("faster_whisper", "whisper", "vosk", "pocketsphinx"))
except Exception:
    found = True   # something is there, however unhappy; say nothing
sys.exit(0 if found else 1)' \
         2>/dev/null; then
        echo 'bandsaunter: speech transcription is unavailable -- no recogniser'
        echo '             is installed. Scanning, recording and CW decoding all'
        echo '             work without one. To add transcription, either:'
        echo '               apt install bandsaunter-transcribe'
        echo '             (from the repository this package came from), or'
        echo '               pip install --break-system-packages faster-whisper'
        echo '             Then: bandsaunter transcribe --engines'
    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"