#!/bin/bash

# library name and version
# Official: https://git.kernel.org/pub/scm/libs/libgpiod/libgpiod.git
LIB_NAME=libgpiod-2.0
PACK_SUFIX=tar.gz

# Cross compiler for cross compile on Linux server
CROSS_COMPILE=arm-linux-gnueabihf-

# this project absolute path
PRJ_PATH=$(cd $(dirname "${BASH_SOURCE[0]}") && pwd)

# binaries install path
PREFIX_PATH=$PRJ_PATH/install

# check installed or not file
INST_FILE=$PREFIX_PATH/lib/libgpiod.so

#+-------------------------+
#| Shell script functions  |
#+-------------------------+

function pr_error() {
    echo -e "\033[40;31m $1 \033[0m"
}

function pr_warn() {
    echo -e "\033[40;33m $1 \033[0m"
}

function pr_info() {
    echo -e "\033[40;32m $1 \033[0m"
}

function check_result()
{
    if [ $? != 0 ] ; then
        pr_error $1
    fi  
}

function do_export()
{
    pr_warn "set cross(${CROSS_COMPILE})"

    # export cross toolchain
    export CC=${CROSS_COMPILE}gcc
    export CXX=${CROSS_COMPILE}g++
    export AS=${CROSS_COMPILE}as
    export AR=${CROSS_COMPILE}ar
    export LD=${CROSS_COMPILE}ld
    export NM=${CROSS_COMPILE}nm
    export RANLIB=${CROSS_COMPILE}ranlib
    export OBJDUMP=${CROSS_COMPILE}objdump
    export STRIP=${CROSS_COMPILE}strip

    # export cross configure
    export CONFIG_CROSS=" --build=i686-pc-linux --host=arm-linux "

    # Clear LDFLAGS and CFLAGS
    export LDFLAGS=
    export CFLAGS=
}

function do_fetch()
{
    if [ -e ${INST_FILE} ] ; then
        pr_warn "$LIB_NAME compile and installed alredy"
        exit ;
    fi

    if [ -d $LIB_NAME ] ; then
        pr_warn "$LIB_NAME fetch already"
        return ;
    fi

    if [ ! -f ${LIB_NAME}.${PACK_SUFIX} ] ; then
        wget https://git.kernel.org/pub/scm/libs/libgpiod/libgpiod.git/snapshot/${LIB_NAME}.${PACK_SUFIX}
        check_result "ERROR: download ${LIB_NAME} failure"
    fi

	pr_warn "$LIB_NAME download already, decompress it now"
    tar -xzf ${LIB_NAME}.${PACK_SUFIX}
}

function do_build()
{
    cd $LIB_NAME

    ./autogen.sh

    do_export

    echo "ac_cv_func_malloc_0_nonnull=yes" > arm-linux.cache
    ./configure --prefix=${PREFIX_PATH} ${CONFIG_CROSS} --enable-static \
        --cache-file=arm-linux.cache --enable-tools
    check_result "ERROR: configure ${LIB_NAME} failure"

    make -j ${JOBS} && make install
    check_result "ERROR: compile ${LIB_NAME} failure"
}

function do_clean()
{
	rm -rf ${LIB_NAME}*
	rm -rf install
}

if [[ $# == 1 && $1 == -c ]] ;then
    pr_warn "start clean $LIB_NAME"
    do_clean
    exit;
fi

do_fetch

do_build