#!/usr/bin/env bash
#
# build_deb.sh — build the lxpanel .deb with the Erisian/Unix-time
# Digital Clock.
#
# Source: the official Debian source package (3.0 quilt) is unpacked with
# the Debian tool "dpkg-source -x", and our modification is applied on top:
#
#   erisian-time.patch   (Digital Clock: christian / erisian / unix time)
#
# One-time setup (needs root):
#   sudo apt-get update
#   sudo apt-get install -y dpkg-dev apt-utils build-essential autoconf automake libtool
#   sudo apt-get build-dep lxpanel
#
# Build (no root needed):
#   ./build_deb.sh
#
set -euo pipefail

# Use system build tools only — a foreign toolchain earlier in PATH (e.g.
# ~/linuxbrew) breaks the final link (libX11 -> libxcb undefined refs).
export PATH="/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin"

HERE="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
cd "$HERE"

PKG=lxpanel
VER=0.11.1
DEBREV=1
SRC_DIR="$PKG-$VER"
DSC="${PKG}_${VER}-${DEBREV}.dsc"
ORIG_TAR="${PKG}_${VER}.orig.tar.gz"
DEB_TAR="${PKG}_${VER}-${DEBREV}.debian.tar.xz"
PATCH=erisian-time.patch
POOL="http://deb.debian.org/debian/pool/main/l/lxpanel"

# --- 0. sanity -------------------------------------------------------------
for t in dpkg-source curl patch; do
    command -v "$t" >/dev/null 2>&1 || { echo "ERROR: '$t' not found (install dpkg-dev/curl/patch)."; exit 1; }
done

# --- 1. make sure the Debian source tree is unpacked (quilt patches applied) --
if [ ! -d "$SRC_DIR/debian" ]; then
    echo ">> Unpacking Debian source ($DSC) ..."
    [ -f "$DSC" ]      || curl -fsS -o "$DSC"      "$POOL/$DSC"
    [ -f "$ORIG_TAR" ] || curl -fsS -o "$ORIG_TAR" "$POOL/$ORIG_TAR"
    [ -f "$DEB_TAR" ]  || curl -fsS -o "$DEB_TAR"  "$POOL/$DEB_TAR"
    dpkg-source -x "$DSC"
fi

# --- 2. apply our modification (idempotent) --------------------------------
if grep -q "dclock_expand_codes" "$SRC_DIR/plugins/dclock.c"; then
    echo ">> $PATCH already applied — skipping."
else
    echo ">> Applying $PATCH ..."
    ( cd "$SRC_DIR" && patch -p1 < "$HERE/$PATCH" )
fi

# --- 3. build the binary .deb --------------------------------------------
echo ">> Building .deb with dpkg-buildpackage ..."
( cd "$SRC_DIR" && dpkg-buildpackage -b -us -uc )

# --- 4. report -----------------------------------------------------------
echo
echo ">> Built packages (in $HERE):"
ls -1 "$HERE"/*.deb
echo
echo "Install with:"
echo "  sudo dpkg -i $(ls -1 "$HERE"/${PKG}_*.deb | tr '\n' ' ')"