#! /bin/sh

set -e

DEFAULT_PREFIX=/usr/local
DEFAULT_THUMBNAIL_HEIGHT=96

usage()
{
    printf "$0 [OPTION]...\n\n"
	printf "Configuration:\n"
	printf "%s\t\t\t" "--prefix=PREFIX"
	printf "Sets installation prefix (default: $DEFAULT_PREFIX).\n"
	printf "%s\t\t\t" "--thumbnails"
	printf "Enables thumbnail generation for images.\n"
	printf "%s\t" "--thumbnail-height=HEIGHT"
	printf "Sets thumbnail height, in pixels "
	printf "(default: $DEFAULT_THUMBNAIL_HEIGHT). "
	printf "Requires --thumbnails.\n"
	printf "%s\t\t\t" "-h|--help"
	printf "Prints this help page.\n"
}

CC=${CC:-cc}
CFLAGS=${CFLAGS:-}

for arg
do
    case "$arg" in
        --thumbnails)
            THUMBNAILS=1
            ;;
        --thumbnail-height=*)
            THUMBNAIL_HEIGHT=${arg#*=}
            ;;
        --prefix=*)
            PREFIX=${arg#*=}
            ;;
        -h | --help)
            usage
            exit 0
            ;;
		*)
			echo "Invalid argument $arg" >&2
			usage >&2
			exit 1
			;;
    esac
done

THUMBNAILS=${THUMBNAILS:-0}
THUMBNAIL_HEIGHT=${THUMBNAIL_HEIGHT:-$DEFAULT_THUMBNAIL_HEIGHT}
PREFIX=${PREFIX:-$DEFAULT_PREFIX}

OBJECTS="\
	auth.o \
	base64.o \
	cftw.o \
	handler.o \
	hex.o \
	html.o \
	http.o \
	jwt.o \
	main.o \
	page.o \
	server.o \
	dynstr/dynstr.o"

LIBS="\
	-lcjson \
	-lssl \
	-lm \
	-lcrypto"

CFLAGS=${CFLAGS:-'$(O) $(CDEFS) -g -Wall -Idynstr/include -Imkdir_r -MD -MF -'}

if [ $THUMBNAILS -ne 0 ]
then
	LIBS="$LIBS $(GraphicsMagick-config --libs)"
	CFLAGS="$CFLAGS $(GraphicsMagick-config --cppflags |
		tr '\n' ' ')"
	CFLAGS="$CFLAGS -DTHUMBNAIL_HEIGHT=$THUMBNAIL_HEIGHT"
	CFLAGS="$CFLAGS -Imkdir_r/private_include"
	LDFLAGS="$LDFLAGS $(GraphicsMagick-config --ldflags)"
	OBJECTS="$OBJECTS \
	thumbnail.o \
	mkdir_r/mkdir_r.o \
	mkdir_r/posix.o"
else
	OBJECTS="$OBJECTS thumbnail_stub.o mkdir_r_stub.o"
fi

cat > Makefile <<"EOF"
.POSIX:
.SUFFIXES: .c .o

PROJECT = slcl
O = -Og
CDEFS = -D_FILE_OFFSET_BITS=64 # Required for large file support on 32-bit.
DEPS = $(OBJECTS:.o=.d)
EOF

cat >> Makefile <<EOF
CFLAGS = $CFLAGS
LIBS = $LIBS
LDFLAGS = $LDFLAGS
OBJECTS = $OBJECTS
PREFIX = $PREFIX

EOF

cat >> Makefile <<"EOF"
all: $(PROJECT)

clean:
	rm -f $(OBJECTS) $(DEPS)

install: $(PROJECT)
	mkdir -p $(PREFIX) $(PREFIX)/bin
	cp $(PROJECT) $(PREFIX)/bin
	chmod 0755 $(PREFIX)/bin/$(PROJECT)
	+cd doc && $(MAKE) install PREFIX=$(PREFIX)

$(PROJECT): $(OBJECTS)
	$(CC) $(OBJECTS) $(LDFLAGS) $(LIBS) -o $@

.c.o:
	$(CC) $(CFLAGS) -c $< -o $@ > $(@:.o=.d)

-include $(DEPS)
EOF