#!/bin/sh
# Copyright © 2011 Rafaël Carré
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.

MIN_AUTOCONF=2.71
MIN_AUTOMAKE=1.15
MIN_BISON=3.0.0
MIN_CMAKE=3.18.0
MIN_LIBTOOL=2.4
MIN_M4=1.4.16
MIN_MESON=0.60.0
MIN_NASM=2.15
MIN_PROTOC=3.4.0

export LC_ALL=
FOUND=

check_version() {
    gotver=$2
    gotmajor=`echo $gotver|cut -d. -f1`
    gotminor=`echo $gotver|cut -d. -f2`
    gotmicro=`echo $gotver|cut -d. -f3|tr -c -d '[:digit:]'`
    [ -z "$gotmicro" ] && gotmicro=0
    needmajor=`echo $3|cut -d. -f1`
    needminor=`echo $3|cut -d. -f2`
    needmicro=`echo $3|cut -d. -f3`
    [ -z "$needmicro" ] && needmicro=0
    if [ "$needmajor" -gt "$gotmajor" ] ||
       [ "$needmajor" -eq "$gotmajor" -a "$needminor" -gt "$gotminor" ] ||
       [ "$needmajor" -eq "$gotmajor" -a "$needminor" -eq "$gotminor" -a "$needmicro" -gt "$gotmicro" ];
    then
        echo "$1 incompatible version (expected $3, got $2)"
        NEEDED="$NEEDED $1"
    else
        FOUND="$FOUND $1"
    fi

}

check_version_majmin() {
    gotver=$2
    gotmajor=`echo $gotver|cut -d. -f1`
    gotminor=`echo $gotver|cut -d. -f2`
    needmajor=`echo $3|cut -d. -f1`
    needminor=`echo $3|cut -d. -f2`
    if [ "$needmajor" -ne "$gotmajor" \
         -o "$needminor" -ne "$gotminor" ]
    then
        echo "$1 not compatible"
        NEEDED="$NEEDED $1"
    else
        FOUND="$FOUND $1"
    fi

}

check_tar() {
if ! tar PcJ /dev/null >/dev/null 2>&1 && ! tar PcJf /dev/null /dev/null 2>&1
then
    echo "tar doesn't support xz (J option)"
    NEEDED="$NEEDED tar"
else
    FOUND="$FOUND tar"
fi
}

check_sed() {
tmp="`pwd`/check_sed"
trap "rm \"$tmp\" \"$tmp-e\" 2>/dev/null" EXIT
echo "test file for GNU sed" > $tmp
if ! sed -i -e 's/sed//' $tmp >/dev/null 2>&1
then
    echo "sed doesn't do in-place editing (-i option)"
    NEEDED="$NEEDED sed"
else
    FOUND="$FOUND sed"
fi
}

check_nasm() {
if ! nasm -v >/dev/null 2>&1
then
    echo "nasm not found"
    NEEDED="$NEEDED nasm"
else
    # found, need to check version ?
    if [ -z "$1" ];then
        FOUND="$FOUND nasm"
    else
        gotver=`nasm -v | cut -d ' ' -f 3`
        check_version nasm $gotver $1
    fi
fi
}

check_ninja() {
if ! ninja --version >/dev/null 2>&1
then
    echo "ninja not found"
    NEEDED="$NEEDED ninja"
else
    jobserver=`ninja --version | head -1 | grep .jobserver`
    if [ -z "$jobserver" ]; then
        echo "ninja missing jobserver support"
        NEEDED="$NEEDED ninja"
    else
        # found, need to check version ?
        if [ -z "$1" ];then
            FOUND="$FOUND ninja"
        else
            gotver=`ninja --version | head -1 | sed s/'.* '//`
            check_version ninja $gotver $1
        fi
    fi
fi
}

check() {
if ! $1 --version >/dev/null 2>&1 && ! $1 -version >/dev/null 2>&1
then
    echo "$1 not found"
    NEEDED="$NEEDED $1"
else
    # found, need to check version ?
    if [ -z "$2" ];then
        FOUND="$FOUND $1"
    else
        gotver=`$1 --version | head -1 | grep -o '[0-9]\+\.[0-9]\+\(\.[0-9]\+\)\?' | head -1`
        check_version $1 $gotver $2
    fi
fi
}

check_majmin() {
if ! $1 --version >/dev/null 2>&1 && ! $1 -version >/dev/null 2>&1 && ! $1 --version 2>/dev/null
then
    echo "$1 not found"
    NEEDED="$NEEDED $1"
else
    # found, need to check version ?
    if [ -z "$2" ];then
        FOUND="$FOUND $1"
    else
        gotver=`$1 --version | head -1 | sed s/'.* '//`
        check_version_majmin $1 $gotver $2
    fi
fi
}

check autoconf $MIN_AUTOCONF
check automake $MIN_AUTOMAKE
check m4 $MIN_M4
check libtool $MIN_LIBTOOL
check pkg-config
check cmake $MIN_CMAKE
check_tar
check_sed
check_majmin protoc $MIN_PROTOC
check ant
check xz
check bison $MIN_BISON
check flex
check_nasm $MIN_NASM
check help2man
check meson $MIN_MESON
check_ninja
check gettext

DEPS_ONLY="help2man"

CPUS=
case `uname` in
    Linux|MINGW32*|MINGW64*|*MSYS*)
        CPUS=`getconf _NPROCESSORS_ONLN 2>&1`
     ;;
    Darwin|FreeBSD|NetBSD)
        CPUS=`getconf NPROCESSORS_ONLN 2>&1`
    ;;
    OpenBSD)
        CPUS=`sysctl -n hw.ncpu 2>&1`
    ;;
    SunOS)
        CPUS=`psrinfo | wc -l 2>&1`
    ;;
    *)
        CPUS=1  # default
     ;;
esac

BOOTSTRAP_PATH="$( cd "$(dirname "$0")" ; pwd -P )"

for t in $FOUND; do
    TARGET_FOUND=".$t $TARGET_FOUND"
done

for t in $NEEDED; do
    TARGET_NEEDED=".$t $TARGET_NEEDED"
    case "$t" in
        *$DEPS_ONLY*)
            ;; # Dependency only, not build by default
        *)
            TARGETS="$TARGETS .build$t"
            ;;
    esac
done

[ -n "$TARGETS" ] && mkdir -p build/bin && echo "To-be-built packages: $(echo $TARGETS | sed 's/.build//g')"

cat > Makefile << EOF
TOOLS = $BOOTSTRAP_PATH
MAKEFLAGS += -j$CPUS
CMAKEFLAGS += --parallel=$CPUS
PREFIX=\$(abspath ./build)
PATH=\${PREFIX}/bin:$PATH

$TARGET_FOUND:
	@echo "Available in the system"
	touch \$@

.SECONDEXPANSION:
$TARGET_NEEDED: \$\$(subst .,.build,\$\$@)
	touch \$@

all: $TARGETS
	@echo "You are ready to build VLC and its contribs"

include \$(TOOLS)/tools.mak

fetch: $(echo $TARGETS | sed 's/.build/.get/g')
EOF
