cd "$(dirname "$0")"
export TOPDIR=$(realpath ..)
if gmake --help >/dev/null 2>&1; then
	export GMAKE=gmake
else
	export GMAKE=make
fi

# build a cache of “ipkg package name” → “package conf option” for
# use with dependency resolution
rm -rf pkglist.d
mkdir pkglist.d
for dn in */Makefile; do
	dn=${dn%/*}
	cd $dn

	# ALL_PKGOPTS: all subpackage conf options
	# PKGNAME_*: subpackage (ipkg) package name, by subpackage option
	eval $($GMAKE dump="ALL_PKGOPTS \
	    \$(foreach x,\${ALL_PKGOPTS},PKGNAME_\${x})")
	cd ..

	if [[ -z $ALL_PKGOPTS ]]; then
		print -u2 "Warning: $dn/Makefile contains no packages, skipped"
		continue
	fi

	for spcu in $ALL_PKGOPTS; do		# spcu: package option, ucase
		eval sppn=\$PKGNAME_$spcu	# sppn: subpackage (ipkg) name
		# once mksh R40 is out, use its new associative arrays here!
		print -r -- "$spcu" >pkglist.d/"$sppn"
	done
done

# build Config.in files and resolve dependencies
for dn in */Makefile; do
	dn=${dn%/*}
	cd $dn

	# PKG_NAME: package name (directory, free-format)
	# PKG_FLAVOURS: all package flavours (boolean options), uppercase
	# PKG_DESCR: package description (directory)
	# PKG_URL: package homepage
	# PKG_CXX: uppercase varname part to use for CFrustFrust checks
	# ALL_PKGOPTS: all subpackage conf options
	# PKGNAME_*: subpackage (ipkg) package name, by subpackage option
	# PKGDESC_*: subpackage description, by subpackage option
	# PKGDEPS_*: subpackage depends on ipkg packages, by subpkg option
	# CFLINE_*: one free-format Config.in line per subpackage option
	# PKGFD_*: flavour description, per package flavour option
	eval $($GMAKE dump="PKG_NAME PKG_FLAVOURS PKG_DESCR PKG_URL PKG_CXX \
	    ALL_PKGOPTS \$(foreach x,\${ALL_PKGOPTS},PKGNAME_\${x} \
	    PKGDESC_\${x} PKGDEPS_\${x} CFLINE_\${x}) \
	    \$(foreach x,\${PKG_FLAVOURS},PKGFD_\${x})")

	# dnu: directory name, uppercase, y/-+/_X/
	typeset -u dnu=${dn//-/_}
	dnu=${dnu//+/X}

	(

	# Handle master package (directory)
	print "config ADK_COMPILE_$dnu"
	if [[ -z $ALL_PKGOPTS ]]; then
		# pseudo package, does not produce an ipkg package
		ppnf=$PKG_NAME			# ppnf: pseudopkg name, filled
		if [[ -n $PKG_DESCR ]]; then
			while (( ${#ppnf} < 34 )); do
				ppnf=$ppnf.
			done
			ppnf="$ppnf $PKG_DESCR"
		fi
		print "\tprompt \"$ppnf\""
	fi
	print \\ttristate
	if [[ -n $ALL_PKGOPTS ]]; then
		# real (master) package, contains 1+ ipkg (sub)packages
		print -n \\tdepends on
		sp=' '				# local sp: space (or ' || ')
		for spcu in $ALL_PKGOPTS; do	# spcu: package option, ucase
			print -n "${sp}ADK_PACKAGE_$spcu"
			sp=' || '
		done
		print
	fi
	print \\tdefault n

	# Handle subpackages / multipackages
	for spcu in $ALL_PKGOPTS; do		# spcu: package option, ucase
		eval sppn=\$PKGNAME_$spcu	# sppn: subpackage (ipkg) name
		eval desc=\$PKGDESC_$spcu	# desc: subpackage description
		: ${desc:=$PKG_DESCR}		# take from main pkg if empty
		eval deps=\$PKGDEPS_$spcu	# deps: subpackage dependencies
		eval xline=\$PKGDESC_$spcu	# xline: one free-format line
		print \\nconfig ADK_PACKAGE_$spcu
		spnf=$sppn			# spnf: subpackage name, filled
		if [[ -n ${desc:-$PKG_NAME} ]]; then
			while (( ${#spnf} < 34 )); do
				spnf=$spnf.
			done
			spnf="$spnf ${desc:-$PKG_NAME}"
		fi
		print "\tprompt \"$spnf\""
		print \\ttristate
		print \\tdefault n
		for dep in $deps; do		# dep: ipkg name of one rundep.
			# skip dependencies on uclibc++ and libstdcxx iff
			# we produce these automatically
			[[ -n $PKG_CXX && $dep = @(uclibc++|libstdcxx) ]] && \
			    continue
			case $dep {
			(kmod-*)
				# produce dependency on kernel package
				# which have special name→sym mangling
				typeset -u udep=${dep//-/_}
				print "\tselect ADK_KPACKAGE_$udep"
				;;
			(*)
				# produce dependency on regular package
				# where the symbol is cached (see above)
				print '\tselect' \
				    ADK_PACKAGE_$(<../pkglist.d/"$dep")
				;;
			}
		done
		print \\tselect ADK_COMPILE_$dnu
		[[ -n $xline ]] && print "\t$xline"
		if [[ -n $desc$PKG_URL ]]; then
			# produce (optional) help text
			print \\thelp
			[[ -n $desc ]] && print "\t  $desc"
			[[ -n $desc && -n $PKG_URL ]] && print '\t  '
			[[ -n $PKG_URL ]] && print "\t  WWW: $PKG_URL"
		fi
	done

	# Handle CFrustFrust library selection, if necessary
	[[ -n $PKG_CXX ]] && cat <<EOF

choice
prompt "C++ library to use"
depends on ADK_COMPILE_$dnu
default ADK_COMPILE_${PKG_CXX}_WITH_STDCXX if ADK_TARGET_LIB_GLIBC || ADK_TARGET_LIB_EGLIBC
default ADK_COMPILE_${PKG_CXX}_WITH_UCLIBCXX if ADK_TARGET_LIB_UCLIBC

config ADK_COMPILE_${PKG_CXX}_WITH_STDCXX
	bool "GNU C++ library"
	select ADK_PACKAGE_LIBSTDCXX

config ADK_COMPILE_${PKG_CXX}_WITH_UCLIBCXX
	bool "uClibc++ library"
	select ADK_PACKAGE_UCLIBCXX

endchoice
EOF

	# Handle flavours (per directory)
	for pfcu in $PKG_FLAVOURS; do		# pfcu: pkg flavour conf opt.
		eval pfd=\$PKGFD_$pfcu		# pfd: pkg flavour description
		print
		print config ADK_PACKAGE_${dnu}_$pfcu
		print "\tbool \"${pfd:-$PKG_NAME -> flavour $pfcu}\""
		print \\tdefault n
		print \\tdepends on ADK_COMPILE_$dnu
		print \\thelp
		print "\t  flavour ADK_PACKAGE_${dnu}_$pfcu for $PKG_NAME"
	done

	) >Config.in
	cd ..
done