#! /bin/sh
# Simple configure script for c-lightning.

set -e

# Default values, loaded from environment or canned.
PREFIX=${PREFIX:-/usr/local}
CC=${CC:-cc}
CWARNFLAGS=${CWARNFLAGS:--Werror -Wall -Wundef -Wmissing-prototypes -Wmissing-declarations -Wstrict-prototypes -Wold-style-definition}
CDEBUGFLAGS=${CDEBUGFLAGS:--std=gnu11 -g -fstack-protector}
DEVELOPER=${DEVELOPER:-0}
COMPAT=${COMPAT:-1}
CONFIGURATOR_CC=${CONFIGURATOR_CC:-$CC}

CONFIGURATOR=ccan/tools/configurator/configurator
CONFIG_VAR_FILE=config.vars
CONFIG_HEADER=ccan/config.h

usage_with_default()
{
    if [ $# = 4 ]; then
	if [ "$2" = 1 ]; then
	    DEF=$3
	else
	    DEF=$4
	fi
    else
	DEF=$2
    fi
    echo "  $1 (default $DEF)"
}

usage()
{
    echo "Usage: ./configure [--reconfigure] [setting=value] [options]"
    echo "If --reconfigure is specified, $CONFIG_VAR_FILE will set defaults if it exists."
    echo "Default settings:"
    usage_with_default "CC" "$CC"
    usage_with_default "CWARNFLAGS" "$CWARNFLAGS"
    usage_with_default "CDEBUGFLAGS" "$CDEBUGFLAGS"
    usage_with_default "CONFIGURATOR_CC" "$CONFIGURATOR_CC"
    usage_with_default "PYTEST" "$PYTEST"
    echo "    To override compile line for configurator itself"

    echo "Options include:"
    usage_with_default "--prefix=" "$PREFIX"
    echo "    Prefix for make install"
    usage_with_default "--enable/disable-developer" "$DEVELOPER" "enable" "disable"
    echo "    Developer mode, good for testing"
    usage_with_default "--enable/disable-experimental-features" "$EXPERIMENTAL_FEATURES" "enable" "disable (unless developer)"
    echo "    Developer mode, good for testing"
    usage_with_default "--enable/disable-compat" "$COMPAT" "enable" "disable"
    echo "    Compatibility mode, good to disable to see if your software breaks"
    usage_with_default "--enable/disable-valgrind" "(autodetect)"
    echo "    Valgrind binary to use for tests"
    exit 1
}

add_var()
{
    echo "Setting $1... $2"
    echo "$1=$2" >> $CONFIG_VAR_FILE
    [ -z "$3" ] || echo "#define $1 $2" >> "$3"
}

find_pytest()
{
    PYTEST_BINS="pytest-3 pytest3 pytest py.test"
    for p in $PYTEST_BINS; do
	if [ "$(which $p)" != "" ] ; then
	    "$p" --version 2>&1 | grep -q "python3" || continue
	    echo "$p"
	    return
	fi
    done

    PYTHON_BINS="python python3"
    for p in $PYTHON_BINS; do
        if [ "$(which $p)" != "" ] ; then
            $p --version 2>&1 | grep -q "Python 3." || continue
            if $p -c "import pytest" ; then
                echo "$p -m pytest"
                return
            fi
        fi
    done
}

PYTEST=${PYTEST:-`find_pytest`}

for opt in "$@"; do
    case "$opt" in
	--reconfigure)
	    # Escape spaces for things like CWARNFLAGS.
	    sed 's/=\(.*\)$/="\1"/' $CONFIG_VAR_FILE > $CONFIG_VAR_FILE.$$
	    . ./$CONFIG_VAR_FILE.$$
	    ;;
	CC=*) CC="${opt#CC=}";;
	CONFIGURATOR_CC=*) CONFIGURATOR_CC="${opt#CONFIGURATOR_CC=}";;
	CWARNFLAGS=*) CWARNFLAGS="${opt#CWARNFLAGS=}";;
	CDEBUGFLAGS=*) CDEBUGFLAGS="${opt#CDEBUGFLAGS=}";;
	PYTEST=*) PYTEST="${opt#PYTEST=}";;
	--prefix=*) PREFIX="${opt#--prefix=}";;
	--enable-developer) DEVELOPER=1;;
	--disable-developer) DEVELOPER=0;;
	--enable-experimental-features) EXPERIMENTAL_FEATURES=1;;
	--disable-experimental-features) EXPERIMENTAL_FEATURES=0;;
	--enable-compat) COMPAT=1;;
	--disable-compat) COMPAT=0;;
	--enable-valgrind) VALGRIND=1;;
	--disable-valgrind) VALGRIND=0;;
	--help|-h) usage;;
	*)
	    echo "Unknown option '$opt'" >&2
	    usage
	    ;;
    esac
done

# If EXPERIMENTAL_FEATURES not set, set it to same as DEVELOPER
EXPERIMENTAL_FEATURES=${EXPERIMENTAL_FEATURES:-$DEVELOPER}

echo -n "Compiling $CONFIGURATOR..."
$CC $CWARNFLAGS $CDEBUGFLAGS -o $CONFIGURATOR $CONFIGURATOR.c
echo "done"

if [ -z "$VALGRIND" ]; then
    if valgrind -q --error-exitcode=7 --track-origins=yes --leak-check=full --show-reachable=yes --errors-for-leak-kinds=all $CONFIGURATOR --help >/dev/null 2>&1; then
	VALGRIND=1
    else
	VALGRIND=0
    fi
fi

rm -f $CONFIG_VAR_FILE.$$
$CONFIGURATOR --autotools-style --var-file=$CONFIG_VAR_FILE.$$ --header-file=$CONFIG_HEADER --configurator-cc="$CONFIGURATOR_CC" "$CC" $CWARNFLAGS $CDEBUGFLAGS
mv $CONFIG_VAR_FILE.$$ $CONFIG_VAR_FILE

add_var PREFIX "$PREFIX"
add_var CC "$CC"
add_var CONFIGURATOR_CC "$CONFIGURATOR_CC"
add_var CWARNFLAGS "$CWARNFLAGS"
add_var CDEBUGFLAGS "$CDEBUGFLAGS"
add_var VALGRIND "$VALGRIND"
add_var DEVELOPER "$DEVELOPER" $CONFIG_HEADER
add_var EXPERIMENTAL_FEATURES "$EXPERIMENTAL_FEATURES" $CONFIG_HEADER
add_var COMPAT "$COMPAT" $CONFIG_HEADER
add_var PYTEST "$PYTEST"

# Hack to avoid sha256 name clash with libwally: will be fixed when that
# becomes a standalone shared lib.
echo '#include "ccan_compat.h"' >> $CONFIG_HEADER