#!/bin/sh

# Is similar to an autoconf configure script, but is written by hand

usage() {
    printf "Usage: %s [options]\\n\\n" "$0"
    printf "  --prefix=/usr/local         Prefix for all files\\n"
    printf "  --bindir=PREFIX/bin         Prefix for binaries\\n"
    printf "  --sbindir=PREFIX/sbin       Prefix for system binaries\\n"
    printf "  --mandir=PREFIX/share/man   Prefix for manpages\\n"
    printf "  --man1dir=MANDIR/man1       Prefix for section 1 manpages\\n"
    printf "  --gopherroot=/var/gopher    Path to gopher root\\n"
    printf "  --sysconfig=/etc/sysconfig  Path to sysconfig directory\\n\\n"
    printf "  --default=/etc/default      Path to 'default' configuration directory\\n\\n"
    printf "  --launchd=/Library/LaunchDaemons                  Path to launchd for MacOS\\n"
    printf "  --haikusrv=/boot/common/settings/network/services Path to services directory in Haiku\\n\\n"
    printf "  --os=autodetected        Your target OS, one of linux, mac, haiku, netbsd, openbsd or freebsd\\n"
    printf "  --listener=autodetected  Program to recieve and pass network requests; one or more of systemd, inetd, xinetd, comma-seperated, or autodetect, mac or haiku (parameter required, mac/haiku required on respective OSes)\\n"
    printf "  --hostname=autodetected  Desired hostname for gophernicus to identify as\\n"
}

# Set values for each option
while [ "$#" -gt 0 ] ; do
    opt="${1%%=*}"
    opt="${opt##--}"
    value="${1##*=}"
    case "${opt}" in
        prefix) PREFIX="${value}"; shift ;;
        bindir) BINDIR="${value}"; shift ;;
        sbindir) SBINDIR="${value}"; shift ;;
        docdir) DOCDIR="${value}"; shift ;;
        mandir) MANDIR="${value}"; shift ;;
        man1dir) MAN1DIR="${value}"; shift ;;
        gopherroot) GOPHERROOT="${value}"; shift ;;
        sysconfig) SYSCONFIG="${value}"; shift ;;
        default) DEFAULTCONF="${value}"; shift ;;
        os) OS="${value}"; shift ;;
        launchd) LAUNCHD="${value}"; shift ;;
        haikusrv) HAIKUSRV="${value}"; shift ;;
        listener) LISTENER="${value}"; shift ;;
        hostname) HOSTNAME="${value}"; shift ;;
        help) usage; exit 0 ;;
        *) usage; exit 2 ;;
    esac
done

# Set default values
: ${PREFIX:=/usr/local}
: ${BINDIR:=${PREFIX}/bin}
: ${SBINDIR:=${PREFIX}/sbin}
: ${DOCDIR:=${PREFIX}/share/doc}
: ${MANDIR:=${PREFIX}/share/man}
: ${MAN1DIR:=${MANDIR}/man1}
: ${GOPHERROOT:=/var/gopher}
: ${SYSCONFIG:=/etc/sysconfig}
: ${DEFAULTCONF:=/etc/default}
: ${LAUNCHD:=/Library/LaunchDaemons}
: ${HAIKUSRV:=/boot/common/settings/network/services}
: ${CC:=cc}
: ${CFLAGS:=-O2}
: ${HOSTNAME:=autodetect}

# Check for a compiler that actually works
printf "checking for working compiler... "
cat > conftest.c <<EOF
#include <stdlib.h>
int main() { return 0; }
EOF
if ! ${CC} -o conftest conftest.c; then
    printf "no\\n"
    exit 1
else
    printf "${CC}\\n"
fi

# Autodetect the OS
if ! [ "${OS:=1}" ]; then
    # If it can't find uname, it needs to be manually specified
    printf "checking for uname... "
    if ! UNAME="$(command -v uname)"; then
        printf "please provide OS in options\\n"
        exit 1
    else
        printf "%s\\n" "${UNAME}"
    fi

    # If it can, it presses on
    printf "checking for OS... "
    case "$(${UNAME})" in
        Linux) OS=linux ;;
        Haiku) OS=haiku
            INSTALL_HAIKU="install-haiku" ;;
        Darwin) OS=mac
            INSTALL_OSX="install-osx" ;;
        NetBSD) OS=netbsd ;;
        OpenBSD) OS=openbsd ;;
        FreeBSD) OS=freebsd ;;
        *) printf "unknown, pressing on anyway\\n" ;;
    esac
    printf "%s\\n" "${OS}"
fi

# Checks for an install command and falls back to install-sh
printf "checking for install... "
if ! INSTALL="$(command -v install)"; then
    printf "install-sh"
    INSTALL=build-aux/install-sh
else
    printf "%s" "${INSTALL}"
fi
printf "\\n"

# Check for listener validity and autodetect if required
# Checks that take place:
# mac OS = mac listener (both ways)
# haiku OS = haiku listener (both ways)
# systemd listener = linux OS
printf "checking for listener... "
if [ -z "${LISTENER}" ]; then
    printf "not given\\n"
    exit 1
elif [ "${LISTENER}" = "mac" ] && [ "${OS}" != "mac" ]; then
    printf "mac listener only valid with macos\\n"
    exit 1
elif [ "${LISTENER}" = "haiku" ] && [ "${OS}" != "haiku" ]; then
    printf "haiku listener only valid with haiku\\n"
    exit 1
elif [ "${LISTENER}" = "systemd" ] && [ "${OS}" != "linux" ]; then
    printf "systemd listener only valid with linux\\n"
    exit 1
elif [ "${LISTENER}" = "autodetect" ]; then
    # OS-specific listeners
    case "${OS}" in
        mac)
            LISTENER=mac
            printf "mac\\n"
            break ;;
        haiku)
            LISTENER=haiku
            printf "haiku\\n"
            break ;;
    esac

    if [ -d "/lib/systemd/system" ] ; then
        LISTENER=systemd
        printf "systemd\\n"
        break
    fi

    printf "checking for inetd... "
    if command -v update-inetd; then
        LISTENER=inetd
        printf "inetd\\n"
        break
    fi

    printf "checking for xinetd... "
    if XINETD="$(command -v xinetd)"; then
        LISTENER=xinetd
        printf "xinetd\\n"
        break
    fi

    # Ensure we detected something
    if [ "${LISTENER}" = "autodetect" ]; then
        printf "unable to autodetect, please manually specify\\n"
        exit 1
    fi
elif [ "${OS}" = "haiku" ] && [ "${LISTENER}" != "haiku" ]; then
    printf "only haiku listener supported on haiku\\n"
    exit 1
elif [ "${OS}" = "mac" ] && [ "${LISTENER}" != "mac" ]; then
    printf "only mac listener supported on mac\\n"
    exit 1
else
    printf "%s\\n" "${LISTENER}"
fi

# Act accordingly based on whichever listener we are given
case "${LISTENER}" in
    systemd)
        INSTALL_SYSTEMD="install-systemd"
        UNINSTALL_SYSTEMD="uninstall-systemd" ;;
    xinetd)
        INSTALL_XINETD="install-xinetd"
        UNINSTALL_XINETD="uninstall-xinetd"
        XINETD_CONF="/etc/xinetd.d/gophernicus" ;;
    inetd)
        INSTALL_INETD="install-inetd"
        INETD_CONF="/etc/inetd.conf"
        printf "checking for update-inetd... "
        if ! UPDATE_INETD="$(command -v update-inetd)"; then
            printf "not found\\n"
            INSTALL_INETD_MANUAL="install-inetd-manual"
            UNINSTALL_INETD_UPDATE="uninstall-inetd-update"
        else
            printf "%s\\n" "${UPDATE_INETD}"
            INSTALL_INETD_UPDATE="install-inetd-update"
            UNINSTALL_INETD_UPDATE="uninstall-inetd-update"
        fi
        ;;
    mac) INSTALL_OSX="install-osx" UNINSTALL_OSX="uninstall-osx" ;;
    haiku) INSTALL_HAIKU="install-haiku" UNINSTALL_HAIKU="uninstall-haiku" ;;
    *) printf "The listener %s is not offically supported; continuing anyway.\\n" "${LISTENER}" ;;
esac

# Try to detect hostname
printf "getting hostname... "
if [ "${HOSTNAME}" = "autodetect" ]; then
    HOSTNAME="$(hostname)"
    # If no hostname then we couldn't autodetect
    if [ $? != 0 ] || [ -z "${HOSTNAME}" ]; then
        printf "unable to detect hostname\\n"
        exit 1
    fi
fi
printf "%s\\n" "${HOSTNAME}"

# Use libwrap when it is avaliable
printf "checking for libwrap... "
cat > conftest.c <<EOF
#include <tcpd.h>
int main() {}
EOF
if ${CC} -o conftest -lwrap conftest.c 2>/dev/null; then
    LIBWRAP="-DHAVE_LIBWRAP"
    printf "yes"
else
    LIBWRAP=
    printf "no, but program will still work"
fi
printf "\\n"

# Check and use SHM if avaliable
printf "checking for ipcrm (SHM management)... "
if ! IPCRM="$(command -v ipcrm)"; then
    printf "not found"
else
    printf "%s" "${IPCRM}"
    CLEAN_SHM="clean-shm"
fi
printf "\\n"

# Trying to autodetect make
printf "checking for make... "
if ! MAKE="$(command -v make)"; then
    printf "not found, please pass MAKE=/path/to/make to make invocation"
    MAKE="make"
else
    printf "%s" "${MAKE}"
fi
printf "\\n"

# Don't replace an existing root
printf "checking for existing gopher root... "
if [ -d "${GOPHERROOT}" ] || [ -f "${GOPHERROOT}/gophermap" ]; then
    INSTALL_ROOT="install-root"
    printf "yes"
else
    printf "no"
fi
printf "\\n"

# Sub in values
cp Makefile.in Makefile

printf "creating Makefile... "
sed -i "s:@CC@:${CC}:" Makefile
sed -i "s:@LIBWRAP@:${LIBWRAP}:" Makefile
sed -i "s:@INSTALL@:${INSTALL}:" Makefile
sed -i "s:@MAKE@:${MAKE}:" Makefile

sed -i "s:@PREFIX@:${PREFIX}:" Makefile
sed -i "s:@BINDIR@:${BINDIR}:" Makefile
sed -i "s:@SBINDIR@:${SBINDIR}:" Makefile
sed -i "s:@DOCDIR@:${DOCDIR}:" Makefile
sed -i "s:@MANDIR@:${MANDIR}:" Makefile
sed -i "s:@MAN1DIR@:${MAN1DIR}:" Makefile

sed -i "s:@IPCRM@:${IPCRM}:" Makefile
sed -i "s:@CLEAN_SHM@:${CLEAN_SHM}:" Makefile

sed -i "s:@SYSCONF@:${SYSCONFIG}:" Makefile
sed -i "s:@DEFAULT@:${DEFAULTCONF}:" Makefile
sed -i "s:@HOSTNAME@:${HOSTNAME}:" Makefile
sed -i "s:@ROOT@:${GOPHERROOT}:" Makefile

sed -i "s:@HAIKUSRV@:${HAIKUSRV}:" Makefile
sed -i "s:@LAUNCHD@:${LAUNCHD}:" Makefile
sed -i "s:@INSTALL_ROOT@:${INSTALL_ROOT}:" Makefile

sed -i "s:@INSTALL_OSX@:${INSTALL_OSX}:" Makefile
sed -i "s:@INSTALL_INETD_MANUAL@:${INSTALL_INETD_MANUAL}:" Makefile
sed -i "s:@INSTALL_INETD_UPDATE@:${INSTALL_INETD_UPDATE}:" Makefile
sed -i "s:@INSTALL_XINETD@:${INSTALL_XINETD}:" Makefile
sed -i "s:@INSTALL_SYSTEMD@:${INSTALL_SYSTEMD}:" Makefile
sed -i "s:@INSTALL_HAIKU@:${INSTALL_HAIKU}:" Makefile
sed -i "s:@UNINSTALL_OSX@:${UNINSTALL_OSX}:" Makefile
sed -i "s:@UNINSTALL_INETD_MANUAL@:${UNINSTALL_INETD_MANUAL}:" Makefile
sed -i "s:@UNINSTALL_INETD_UPDATE@:${UNINSTALL_INETD_UPDATE}:" Makefile
sed -i "s:@UNINSTALL_XINETD@:${UNINSTALL_XINETD}:" Makefile
sed -i "s:@UNINSTALL_SYSTEMD@:${UNINSTALL_SYSTEMD}:" Makefile
sed -i "s:@UNINSTALL_HAIKU@:${UNINSTALL_HAIKU}:" Makefile

sed -i "s:@INETD_CONF@:${INETD_CONF}:" Makefile
sed -i "s:@XINETD_CONF@:${XINETD_CONF}:" Makefile
printf "done\\n"

# Cleanup
rm -f conftest conftest.c