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#!/bin/sh


# some utility functions
isplatform()
{
    for p in $PLATFORM
    do
        if [ "$p" = "$1" ]; then
            return 0
        fi
    done
    return 1
}
notisplatform()
{
    for p in $PLATFORM
    do
        if [ "$p" = "$1" ]; then
            return 1
        fi
    done
    return 0
}
istoolchain()
{
    for t in $TOOLCHAIN
    do
        if [ "$t" = "$1" ]; then
            return 0
        fi
    done
    return 1
}
notistoolchain()
{
    for t in $TOOLCHAIN
    do
        if [ "$t" = "$1" ]; then
            return 1
        fi
    done
    return 0
}

# clean abort
abort_configure()
{
    rm -Rf "$TEMP_DIR"
    exit 1
}

# Test for availability of pkg-config
PKG_CONFIG=`command -v pkg-config`
: ${PKG_CONFIG:="false"}

# Simple uname based platform detection
# $PLATFORM is used for platform dependent dependency selection
OS=`uname -s`
OS_VERSION=`uname -r`
ARCH=`uname -m`
printf "detect platform... "
if [ "$OS" = "SunOS" ]; then
    PLATFORM="solaris sunos unix svr4"
elif [ "$OS" = "Linux" ]; then
    PLATFORM="linux unix"
elif [ "$OS" = "FreeBSD" ]; then
    PLATFORM="freebsd bsd unix"
elif [ "$OS" = "OpenBSD" ]; then
    PLATFORM="openbsd bsd unix"
elif [ "$OS" = "NetBSD" ]; then
    PLATFORM="netbsd bsd unix"
elif [ "$OS" = "Darwin" ]; then
    PLATFORM="macos osx bsd unix"
elif echo "$OS" | grep -i "MINGW" > /dev/null; then
    PLATFORM="windows mingw"
fi
: ${PLATFORM:="unix"}

PLATFORM_NAME=`echo "$PLATFORM" | cut -f1 -d' ' -`
echo "$PLATFORM_NAME"


# help text
printhelp()
{
    echo "Usage: $0 [OPTIONS]..."
    echo 'Configuration:'
    cat << '__EOF__'

Build Types:
  --debug                 add extra compile flags for debug builds
  --release               add extra compile flags for release builds

Optional Features:
  --enable-static         statically link libstdc++
  --enable-asan           compile with address sanitizer
  --enable-ubsan          compile with undefined behavior sanitizer

__EOF__
    abort_configure
}

# create temporary directory
TEMP_DIR=".tmp-`uname -n`"
rm -Rf "$TEMP_DIR"
if mkdir -p "$TEMP_DIR"; then
    :
else
    echo "Cannot create tmp dir $TEMP_DIR"
    echo "Abort"
    exit 1
fi
touch "$TEMP_DIR/options"
touch "$TEMP_DIR/features"

# config variables

# features

#
# parse arguments
#
BUILD_TYPE="default"
for ARG in "$@"
do
    case "$ARG" in
        "--help"*) printhelp ;;
        "--debug") BUILD_TYPE="debug" ;;
        "--release") BUILD_TYPE="release" ;;
        "--enable-static") FEATURE_STATIC=on ;;
        "--disable-static") unset FEATURE_STATIC ;;
        "--enable-asan") FEATURE_ASAN=on ;;
        "--disable-asan") unset FEATURE_ASAN ;;
        "--enable-ubsan") FEATURE_UBSAN=on ;;
        "--disable-ubsan") unset FEATURE_UBSAN ;;
        "-"*) echo "unknown option: $ARG"; abort_configure ;;
    esac
done

# toolchain detection utilities
. make/toolchain.sh

# check languages
lang_c=
lang_cpp=
if detect_cpp_compiler ; then
    lang_cpp=1
fi



# set defaults for dir variables
: ${exec_prefix:="$prefix"}
: ${bindir:='${exec_prefix}/bin'}
: ${sbindir:='${exec_prefix}/sbin'}
: ${libdir:='${exec_prefix}/lib'}
: ${libexecdir:='${exec_prefix}/libexec'}
: ${datarootdir:='${prefix}/share'}
: ${datadir:='${datarootdir}'}
: ${sharedstatedir:='${prefix}/com'}
if [ -z "$sysconfdir" ]; then
    if [ "$prefix" = '/usr' ]; then
        sysconfdir='/etc'
    else
        sysconfdir='${prefix}/etc'
    fi
fi
if [ -z "$localstatedir" ]; then
    if [ "$prefix" = '/usr' ]; then
        localstatedir='/var'
    else
        localstatedir='${prefix}/var'
    fi
fi
if [ -z "$runstatedir" ]; then
    if [ "$prefix" = '/usr' ]; then
        runstatedir='/var/run'
    else
        runstatedir='${prefix}/var'
    fi
fi
: ${includedir:='${prefix}/include'}
: ${infodir:='${datarootdir}/info'}
: ${mandir:='${datarootdir}/man'}
: ${localedir:='${datarootdir}/locale'}


# check if a config.site exists and load it
CONFIG_SITE_OK=0
if [ -n "$CONFIG_SITE" ]; then
    # CONFIG_SITE may contain space separated file names
    for cs in $CONFIG_SITE; do
        printf "loading defaults from $cs... "
        if [ -f "$cs" ]; then
            . "$cs"
            echo ok
            CONFIG_SITE_OK=1
            break
        else
            echo "not found"
        fi
    done
elif [ -f "$prefix/share/config.site" ]; then
    printf "loading site defaults... "
    . "$prefix/share/config.site"
    echo ok
    CONFIG_SITE_OK=1
elif [ -f "$prefix/etc/config.site" ]; then
    printf "loading site defaults... "
    . "$prefix/etc/config.site"
    echo ok
    CONFIG_SITE_OK=1
fi

if [ $CONFIG_SITE_OK -eq 0 ]; then
    # try to detect the correct libdir on our own, except it was changed by the user
    if [ "$libdir" = '${exec_prefix}/lib' ] ; then
        if [ "$TOOLCHAIN_WSIZE" = "64" ] ; then
            if [ "$OS" = "SunOS" ]; then
                [ -d "${exec_prefix}/lib/64" ] && libdir='${exec_prefix}/lib/64'
            else
                [ -d "${exec_prefix}/lib64" ] && libdir='${exec_prefix}/lib64'
            fi
        elif [ "$TOOLCHAIN_WSIZE" = "32" ] ; then
            if [ "$OS" = "SunOS" ]; then
                [ -d "${exec_prefix}/lib/32" ] && libdir='${exec_prefix}/lib/32'
            else
                [ -d "${exec_prefix}/lib32" ] && libdir='${exec_prefix}/lib32'
            fi
        fi
    fi
fi


# generate vars.mk
cat > "$TEMP_DIR/vars.mk" << __EOF__
__EOF__


#
# DEPENDENCIES
#



# create buffer for make variables required by dependencies
echo > "$TEMP_DIR/make.mk"

test_pkg_config()
{
    if "$PKG_CONFIG" --exists "$1" ; then :
    else return 1 ; fi
    if [ -z "$2" ] || "$PKG_CONFIG" --atleast-version="$2" "$1" ; then :
    else return 1 ; fi
    if [ -z "$3" ] || "$PKG_CONFIG" --exact-version="$3" "$1" ; then :
    else return 1 ; fi
    if [ -z "$4" ] || "$PKG_CONFIG" --max-version="$4" "$1" ; then :
    else return 1 ; fi
    return 0
}

print_check_msg()
{
    if [ -z "$1" ]; then
        shift
        printf "$@"
    fi
}

dependency_error_asan()
{
    print_check_msg "$dep_checked_asan" "checking for asan... "
    # dependency asan toolchain="gnuc"
    while true
    do
        if notistoolchain "gnuc"; then
            break
        fi
        TEMP_CXXFLAGS="$TEMP_CXXFLAGS -fsanitize=address"
        TEMP_LDFLAGS="$TEMP_LDFLAGS -fsanitize=address"
        print_check_msg "$dep_checked_asan" "yes\n"
        dep_checked_asan=1
        return 1
    done

    print_check_msg "$dep_checked_asan" "no\n"
    dep_checked_asan=1
    return 0
}
dependency_error_static()
{
    print_check_msg "$dep_checked_static" "checking for static... "
    # dependency static toolchain="gnuc"
    while true
    do
        if notistoolchain "gnuc"; then
            break
        fi
        TEMP_LDFLAGS="$TEMP_LDFLAGS -static"
        print_check_msg "$dep_checked_static" "yes\n"
        dep_checked_static=1
        return 1
    done

    print_check_msg "$dep_checked_static" "no\n"
    dep_checked_static=1
    return 0
}
dependency_error_ubsan()
{
    print_check_msg "$dep_checked_ubsan" "checking for ubsan... "
    # dependency ubsan toolchain="gnuc"
    while true
    do
        if notistoolchain "gnuc"; then
            break
        fi
        TEMP_CXXFLAGS="$TEMP_CXXFLAGS -fsanitize=undefined"
        TEMP_LDFLAGS="$TEMP_LDFLAGS -fsanitize=undefined"
        print_check_msg "$dep_checked_ubsan" "yes\n"
        dep_checked_ubsan=1
        return 1
    done

    print_check_msg "$dep_checked_ubsan" "no\n"
    dep_checked_ubsan=1
    return 0
}

# start collecting dependency information
echo > "$TEMP_DIR/flags.mk"

DEPENDENCIES_FAILED=
ERROR=0
# unnamed dependencies
TEMP_CFLAGS="$CFLAGS"
TEMP_CXXFLAGS="$CXXFLAGS"
TEMP_LDFLAGS="$LDFLAGS"
while true
do
    while true
    do
        if [ -z "$lang_cpp" ] ; then
            ERROR=1
            break
        fi

        TEMP_CXXFLAGS="$TEMP_CXXFLAGS -std=c++23"
        break
    done
    break
done

# build type
if [ "$BUILD_TYPE" = "debug" ]; then
    TEMP_CFLAGS="\${DEBUG_CFLAGS} $TEMP_CFLAGS"
    TEMP_CXXFLAGS="\${DEBUG_CXXFLAGS} $TEMP_CXXFLAGS"
fi
if [ "$BUILD_TYPE" = "release" ]; then
    TEMP_CFLAGS="\${RELEASE_CFLAGS} $TEMP_CFLAGS"
    TEMP_CXXFLAGS="\${RELEASE_CXXFLAGS} $TEMP_CXXFLAGS"
fi

# add general dependency flags to flags.mk
echo "# general flags" >> "$TEMP_DIR/flags.mk"
if [ -n "${TEMP_CFLAGS}" ] && [ -n "$lang_c" ]; then
    echo "CFLAGS += $TEMP_CFLAGS" >> "$TEMP_DIR/flags.mk"
fi
if [ -n "${TEMP_CXXFLAGS}" ] && [ -n "$lang_cpp" ]; then
    echo "CXXFLAGS += $TEMP_CXXFLAGS" >> "$TEMP_DIR/flags.mk"
fi
if [ -n "${TEMP_LDFLAGS}" ]; then
    echo "LDFLAGS += $TEMP_LDFLAGS" >> "$TEMP_DIR/flags.mk"
fi

#
# OPTION VALUES
#

#
# TARGETS
#

echo >> "$TEMP_DIR/flags.mk"
echo "configuring global target"
echo "# flags for unnamed target" >> "$TEMP_DIR/flags.mk"
TEMP_CFLAGS=
TEMP_CXXFLAGS=
TEMP_LDFLAGS=


# Features
if [ -n "$FEATURE_STATIC" ]; then
    # check dependency
    if dependency_error_static ; then
        # "auto" features can fail and are just disabled in this case
        if [ "$FEATURE_STATIC" = "auto" ]; then
            DISABLE_FEATURE_STATIC=1
        else
            DEPENDENCIES_FAILED="$DEPENDENCIES_FAILED static "
            ERROR=1
        fi
    fi
    if [ -n "$DISABLE_FEATURE_STATIC" ]; then
        unset FEATURE_STATIC
    fi
fi
if [ -n "$FEATURE_STATIC" ]; then
    :
else
    :
fi
if [ -n "$FEATURE_ASAN" ]; then
    # check dependency
    if dependency_error_asan ; then
        # "auto" features can fail and are just disabled in this case
        if [ "$FEATURE_ASAN" = "auto" ]; then
            DISABLE_FEATURE_ASAN=1
        else
            DEPENDENCIES_FAILED="$DEPENDENCIES_FAILED asan "
            ERROR=1
        fi
    fi
    if [ -n "$DISABLE_FEATURE_ASAN" ]; then
        unset FEATURE_ASAN
    fi
fi
if [ -n "$FEATURE_ASAN" ]; then
    :
else
    :
fi
if [ -n "$FEATURE_UBSAN" ]; then
    # check dependency
    if dependency_error_ubsan ; then
        # "auto" features can fail and are just disabled in this case
        if [ "$FEATURE_UBSAN" = "auto" ]; then
            DISABLE_FEATURE_UBSAN=1
        else
            DEPENDENCIES_FAILED="$DEPENDENCIES_FAILED ubsan "
            ERROR=1
        fi
    fi
    if [ -n "$DISABLE_FEATURE_UBSAN" ]; then
        unset FEATURE_UBSAN
    fi
fi
if [ -n "$FEATURE_UBSAN" ]; then
    :
else
    :
fi


if [ -n "${TEMP_CFLAGS}" ] && [ -n "$lang_c" ]; then
    echo "CFLAGS  += $TEMP_CFLAGS" >> "$TEMP_DIR/flags.mk"
fi
if [ -n "${TEMP_CXXFLAGS}" ] && [ -n "$lang_cpp" ]; then
    echo "CXXFLAGS  += $TEMP_CXXFLAGS" >> "$TEMP_DIR/flags.mk"
fi
if [ -n "${TEMP_LDFLAGS}" ]; then
    echo "LDFLAGS += $TEMP_LDFLAGS" >> "$TEMP_DIR/flags.mk"
fi


# final result
if [ $ERROR -ne 0 ]; then
    echo
    echo "Error: Unresolved dependencies"
    echo "$DEPENDENCIES_FAILED"
    abort_configure
fi

echo "configure finished"
echo
echo "Toolchain:"
echo "  name:           $TOOLCHAIN_NAME"
if [ -n "$TOOLCHAIN_CC" ]; then
    echo "  cc:             $TOOLCHAIN_CC"
fi
if [ -n "$TOOLCHAIN_CXX" ]; then
    echo "  cxx:            $TOOLCHAIN_CXX"
fi
if [ -n "$TOOLCHAIN_WSIZE" ]; then
    echo "  word size:      $TOOLCHAIN_WSIZE bit"
fi
if [ -n "$TOOLCHAIN_CSTD" ]; then
    echo "  default C std:  $TOOLCHAIN_CSTD"
fi
echo
echo "Config:"
echo
echo "Features:"
printf '  %-16s' 'static:'
if [ -n "$FEATURE_STATIC" ]; then
    echo 'on'
else
    echo 'off'
fi
printf '  %-16s' 'asan:'
if [ -n "$FEATURE_ASAN" ]; then
    echo 'on'
else
    echo 'off'
fi
printf '  %-16s' 'ubsan:'
if [ -n "$FEATURE_UBSAN" ]; then
    echo 'on'
else
    echo 'off'
fi
echo

# generate the config.mk file
pwd=`pwd`
cat > "$TEMP_DIR/config.mk" << __EOF__
#
# config.mk generated by:
# pwd: $pwd
# $0 $@
#

__EOF__
write_toolchain_defaults "$TEMP_DIR/toolchain.mk"
cat "$TEMP_DIR/config.mk" "$TEMP_DIR/vars.mk" "$TEMP_DIR/toolchain.mk" "$TEMP_DIR/flags.mk" "$TEMP_DIR/make.mk" > config.mk
rm -Rf "$TEMP_DIR"