#!/bin/bash

# Git url
GITURL=https://gitlab.freedesktop.org/libevdev/libevdev.git

# branch
BRANCH=master

# library name
LIB_NAME=$(basename "$GITURL" .git)

# Cross compiler for cross compile on Linux server
CROSS_COMPILE=/opt/gcc-aarch32-10.3-2021.07/bin/arm-none-linux-gnueabihf-

# compile jobs
JOBS=`cat /proc/cpuinfo |grep "processor"|wc -l`

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

# top project absolute path
TOP_PATH=$(realpath $PRJ_PATH/..)

# binaries build prefix install path
PREFIX_PATH=$TOP_PATH/install

# binaries finally install path if needed
#INST_PATH=/tftp

# download taballs path
TARBALL_PATH=$PRJ_PATH/tarballs

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

# shell script will exit once get command error
set -e

#+-------------------------+
#| 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 do_export()
{
    pr_warn "cross(${CROSS_COMPILE}) compile $LIB_NAME"

    export CC=${CROSS_COMPILE}gcc
    export CXX=${CROSS_COMPILE}g++
    export AR=${CROSS_COMPILE}ar
    export LD=${CROSS_COMPILE}ld
    export STRIP=${CROSS_COMPILE}strip

    export CROSS_FILE=cross.txt
}

function do_fetch()
{
    if [ -e ${INST_FILE} ] ; then
        pr_warn "$LIB_NAME compiled already, exit..."
        exit;
    fi

    if [ -d $LIB_NAME ] ; then
        pr_warn "$LIB_NAME source code fetched already"
        return 0;
    fi

    pr_info "start fetch $LIB_NAME source code"
    if [ ! -d $LIB_NAME ] ; then
        git clone -b $BRANCH $GITURL
    fi

    cd $PRJ_PATH
}

function do_build()
{
    BUILD_DIR="build"

    cd "$LIB_NAME" || exit 1

    rm -rf "$BUILD_DIR" && mkdir -p $BUILD_DIR && cd $BUILD_DIR

    cat > "$CROSS_FILE" <<EOF

[binaries]
c = '${CC}'
cpp = '${CXX}'
ar = '${AR}'
strip = '${STRIP}'
pkgconfig = 'pkg-config'

[host_machine]
system = 'linux'
cpu_family = 'arm'
cpu = 'armv7'
endian = 'little'
EOF

    meson setup .. --cross-file "$CROSS_FILE" --prefix="$PREFIX_PATH" -Ddocumentation=disabled -Dtests=disabled

    ninja -j$(nproc) && ninja install

    cd "$PRJ_PATH" || exit 1
}

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

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

do_fetch

do_export

do_build