#!/bin/bash

CROSS_CC=arm-linux-gnueabihf-gcc
CROSS_CXX=arm-linux-gnueabihf-g++

function help {
cat <<EOF
configure script for RF24 library.
Options:

Help:
    -h, --help                  print this message

Driver options:
    --driver=[wiringPi|SPIDEV|MRAA|RPi|LittleWire]
                                Driver for RF24 library. [configure autodetected]

Building options:
    --os=[LINUX|DARWIN]         Operating system. [configure autodetected]
    --soc=[BCM2835|BCM2836|AM33XX|A10|A13|A20|H3]
                                SoC type to be used. [configure autodetected]
    --cpu-flags=<CFLAGS>        CPU defining/optimizing flags to be used. [configure autodetected]
    --extra-cflags=<CFLAGS>     Extra C flags passed to C/C++ compilation. []
    --extra-ldflags=<LDFLAGS>   Extra C flags passed to linking. []
    --libname=<LIBNAME>         Library name. [rf24]
    --c_compiler=<CC>           C compiler. [arm-linux-gnueabihf-gcc][gcc]
    --cxx_compiler=<CXX>        C++ compiler [arm-linux-gnueabihf-g++][g++]
    --no-clean                  Don't clean previous build artifacts

Installation options:
    --prefix=<PREFIX>           Installation prefix path. [/usr/local]
    --lib-dir=<DIR>             Library target installation directory. [PREFIX/lib]
    --header-dir=<DIR>          Header files target installation directory. [PREFIX/include]
    --examples-dir=<DIR>        Example files installation directory. [PREFIX/bin]
    --ldconfig=<LDCONFIG>       Ldconfig binary. Can be set to '' to skip ldconfig step. [ldconfig]

Cross-compilation options:
    --remote-host=<REMOTE_HOST> Remote hostname for installation.
    --remote-user=<REMOTE_USER> Remote username for installation. [current user]
    --remote-port=<REMOTE_PORT> Ssh port of remote machine. [22]
    --remote=<USER@HOST>        Remote ssh host identification for installation [REMOTE_USER@REMOTE_HOST]
    --remote-prefix=<RPREFIX>   Remote host installation prefix path. [/usr/local]
    --remote-lib-dir=<DIR>      Remote library target installation directory [RPREFIX/lib]
    --remote-header-dir=<DIR>   Remote header files target installation directory. [RPREFIX/include]
    --remote-ldconfig=<RLDCON>  Remote ldconfig binary filename. Can be set to '' to skip ldconfig call. [ldconfig]
    --remote-examples-dir=<DIR> Example files remote installation directory. Default: [REMOTE_PREFIX/bin]

EOF
}

function execute_check {
    if [ "${REMOTE}" ]; then
        ssh -o 'PasswordAuthentication=no' -o 'PreferredAuthentications=publickey' -o 'ConnectTimeout=30' -o 'BatchMode=yes' -o 'StrictHostKeyChecking=no' -p ${REMOTE_PORT} ${REMOTE} $1
    else
        eval $1
    fi
}

function die {
    echo "[ERROR] $1"
    exit $2
}

function detect_machine {
    local cpu=$(execute_check "uname -m 2>/dev/null")
    local machine=$(execute_check "cat /sys/firmware/devicetree/base/model 2>/dev/null")
    local hardware=$(execute_check "grep sunxi_platform /sys/class/sunxi_info/sys_info 2>/dev/null | sed 's/^.*: \(.*\)$/\1/'")
    if [ -z "$hardware" ]; then
        local hardware=$(execute_check "grep Hardware /proc/cpuinfo 2>/dev/null | sed 's/^.*: \(.*\)$/\1/'")
    fi
    local soc="unknown"
    local tp="unknown"

    if [ -z "$cpu" ]; then
        cpu="unknown"
    fi

    case $hardware in
    BCM2708|BCM2835)
        soc="BCM2835"
        if [[ $machine == "Raspberry"* ]]; then
            tp="RPi"
        fi
        ;;
    BCM2709)
        soc="BCM2836"
        if [[ $machine == "Raspberry"* ]]; then
            tp="RPi2"
        fi
        ;;
    sun4i|Sun4iw1p1)
        soc="A10"
        ;;
    sun5i|Sun4iw2p1)
        soc="A13"
        ;;
    Sun4iw2p2)
        soc="A12"
        ;;
    Sun4iw2p3)
        soc="A10s"
        ;;
    sun6i|Sun8iw1p1)
        soc="A31"
        ;;
    Sun8iw1p2)
        soc="A31s"
        ;;
    sun7i|Sun8iw2p1)
        soc="A20"
        if [[ $machine == "Banana Pi"* ]]; then
            tp="BananaPi"
        elif [[ $machine == "Banana Pro"* ]]; then
            tp="BananaPro"
        fi
        ;;
    sun8i|Sun8iw7p1)
        soc="H3"
        ;;
    Sun8iw3p1)
        soc="A23"
        ;;
    Sun8iw5p1)
        soc="A33"
        ;;
    Sun8iw6p1)
        soc="A83t"
        ;;
    sun9i|Sun9iw1p1)
        soc="A80"
        ;;
    Sun9iw1p2)
        soc="A80t"
        ;;
    sun50i|Sun50iw1p1)
        soc="A64"
        ;;
    'Generic AM33XX'*)
        soc="AM33XX"
        ;;
    *)
        soc="unknown"
    esac
    echo "${soc} ${tp} ${cpu}"
}

function gcc_cpu_flags {
    local soc=$1
    case $soc in
    BCM2835)
        flags="-march=armv6zk -mtune=arm1176jzf-s -mfpu=vfp -mfloat-abi=hard"
        ;;
    BCM2836)
        flags="-march=armv7-a -mtune=cortex-a7 -mfpu=neon-vfpv4 -mfloat-abi=hard"
        ;;
    AM33XX)
        flags="-march=armv7-a -mtune=cortex-a8 -mfpu=neon -mfloat-abi=hard"
        ;;
    A10)
        flags="-march=armv7-a -mtune=cortex-a8 -mfpu=neon -mfloat-abi=hard"
        ;;
    A13)
        flags="-march=armv7-a -mtune=cortex-a8 -mfpu=neon -mfloat-abi=hard"
        ;;
    A20)
        flags="-march=armv7-a -mtune=cortex-a7 -mfpu=neon-vfpv4 -mfloat-abi=hard"
        ;;
    H3)
        flags="-march=armv8-a -mtune=cortex-a53 -mfpu=neon-vfpv4 -mfloat-abi=hard"
        ;;
    *)
        flags=""
    esac
    echo ${flags}
}

function detect_driver {
    if [[ $(execute_check "cat /proc/cpuinfo | grep Hardware | grep 'BCM2708\|BCM2709\|BCM2835'") ]]; then
        result=RPi
    elif [[ $(execute_check 'ls /dev/spidev* 2>/dev/null') ]]; then
        result=SPIDEV
    elif [[ $(execute_check "file /usr/lib/libwiringPi.so*") ]]; then
        result=wiringPi
    elif [[ $(execute_check "${REMOTE_LDCONFIG} -p | grep libmraa") ]]; then
        result=MRAA
    elif [[ $(execute_check "${REMOTE_LDCONFIG} -p | grep liblittlewire-spi") ]]; then
        result=LittleWire
    else
        result=""
    fi
    echo $result
}

function gen_symlink_names {
    base_name="$1"
    version="$2"

    IFS='.' read -r -a ver <<< "$version"
    versions=""
    for index in "${!ver[@]}" ; do
        verstr=""
        for ind in `seq 0 $(expr $index - 1)` ; do
            verstr="${verstr}.${ver[$ind]}"
        done
        versions="${base_name}${verstr} $versions"
    done
    echo ${versions}
}

params="OS SOC DRIVER CPUFLAGS CFLAGS PREFIX REMOTE_PREFIX LIB LIBNAME LIB_VERSION LIBSYMLINKS LIBDEPRECATE CC CXX LIB_DIR REMOTE_LIB_DIR HEADER_DIR REMOTE_HEADER_DIR DRIVER_DIR ARCH_DIR REMOTE REMOTE_HOST REMOTE_USER REMOTE_PORT SHARED_LINKER_FLAGS SHARED_LINKER_LIBS LDCONFIG REMOTE_LDCONFIG EXAMPLES_DIR REMOTE_EXAMPLES_DIR"

for opt do
    if [ "$opt" = "-h" ] || [ "$opt" = "--help" ]; then
        help
        exit 0
    fi
    optarg="${opt#*=}"
    case "$opt" in
    --os=*)
        OS="$optarg"
        ;;
    --soc=*)
        SOC="$optarg"
        ;;
    --cpu-flags=*)
        CPUFLAGS="$optarg"
        ;;
    --extra-cflags=*)
        CFLAGS="$optarg"
        ;;
    --extra-ldflags=*)
        LDFLAGS="$optarg"
        ;;
    --libname=*)
        LIB="$optarg"
        ;;
    --c_compiler=*)
        CC="$optarg"
        ;;
    --cxx_compiler=*)
        CXX="$optarg"
        ;;
    --no-clean*)
        NO_CLEAN="1"
        ;;
    --prefix=*)
        PREFIX="$optarg"
        ;;
    --lib-dir=*)
        LIB_DIR="$optarg"
        ;;
    --header-dir=*)
        HEADER_DIR="$optarg"
        ;;
    --examples-dir=*)
        EXAMPLES_DIR="$optarg"
        ;;
    --ldconfig=*)
        LDCONFIG="$optarg"
        ;;
    --driver=*)
        DRIVER="$optarg"
        ;;
    --remote-host=*)
        REMOTE_HOST="$optarg"
        ;;
    --remote-user=*)
        REMOTE_USER="$optarg"
        ;;
    --remote-port=*)
        REMOTE_PORT="$optarg"
        ;;
    --remote=*)
        REMOTE="$optarg"
        ;;
    --remote-prefix=*)
        REMOTE_PREFIX="$optarg"
        ;;
    --remote-lib-dir=*)
        REMOTE_LIB_DIR="$optarg"
        ;;
    --remote-header-dir=*)
        REMOTE_HEADER_DIR="$optarg"
        ;;
    --remote-ldconfig=*)
        REMOTE_LDCONFIG="$optarg"
        ;;
    --remote-examples-dir=*)
        REMOTE_EXAMPLES_DIR="$optarg"
        ;;
    *)
        echo "[WARNING] Unknown option detected:$opt, ignored"
        ;;
    esac
done

#*******************************************
# remote machine verification
if [ "${REMOTE_HOST}" ]; then
    if [ "${REMOTE_USER}" ]; then
        REMOTE=${REMOTE_USER}@${REMOTE_HOST}
    else
        REMOTE=${REMOTE_HOST}
    fi
fi
if [ "${REMOTE}" ]; then
    echo "[SECTION] Checking remote host."
    if [ -z "${REMOTE_HOST}" ]; then
        REMOTE_HOST=${REMOTE/*@/}
    fi
    if [ -z "${REMOTE_PORT}" ]; then
        REMOTE_PORT=22
    fi
    if [ "$(nmap ${REMOTE_HOST} -Pn  --host-timeout 30s -p ${REMOTE_PORT} 2>/dev/null | grep open)" ]; then
        echo "  [OK] ssh daemon on ${REMOTE_HOST} port ${REMOTE_PORT} seems to be listening."
    else
        echo "  [WARNING] ssh on ${REMOTE_HOST} port ${REMOTE_PORT} seems not to be listening or nmap not installed."
    fi
    if [[ "$(execute_check 'echo ok 2>/dev/null' 2>/dev/null)" ]]; then
        echo "  [OK] Remote machine ssh passwordless login configured fine."
    else
        die "Remote machine ssh and/or passwordless login check failed." 4
    fi
    if [[ $(execute_check "sudo echo ok 2>/dev/null") ]]; then
        echo "  [OK] Remote machine sudo configured fine."
    else
        die "Remote machine sudo test failed." 5
    fi
fi

if [ -z "${CC}" ]; then
    echo "[SECTION] Detecting arm compilation environment."
    if [[ $(command -v ${CROSS_CC} 2>/dev/null) ]]; then
        echo "  [OK] ${CROSS_CC} detected."
        CC=${CROSS_CC}
        CROSS_SYSROOT="$(${CC} --print-sysroot)"
        if [ "${CROSS_SYSROOT}" = "/" ]; then
            CROSS_SYSROOT=""
        fi
    else
        echo "  [INFO] ${CROSS_CC} not found."
    fi
    if [[ $(command -v ${CROSS_CXX} 2>/dev/null) ]]; then
        echo "  [OK] ${CROSS_CXX} detected."
        CXX=${CROSS_CXX}
    else
        echo "  [INFO] ${CROSS_CXX} not found."
    fi
fi

if [ "${CROSS_SYSROOT}" ]; then
    PREFIX="${CROSS_SYSROOT}/usr/local"
fi

PREFIX=${PREFIX:-/usr/local}
REMOTE_PREFIX=${REMOTE_PREFIX:-/usr/local}
LIB_DIR=${LIB_DIR:-${PREFIX}/lib}
REMOTE_LIB_DIR=${REMOTE_LIB_DIR:-${REMOTE_PREFIX}/lib}
HEADER_DIR=${HEADER_DIR:-${PREFIX}/include/RF24}
REMOTE_HEADER_DIR=${REMOTE_HEADER_DIR:-${REMOTE_PREFIX}/include/RF24}
EXAMPLES_DIR=${EXAMPLES_DIR:-${PREFIX}/bin}
REMOTE_EXAMPLES_DIR=${REMOTE_EXAMPLES_DIR:-${REMOTE_PREFIX}/bin}
LDCONFIG=${LDCONFIG-ldconfig}
REMOTE_LDCONFIG=${REMOTE_LDCONFIG-/sbin/ldconfig}
LIB=${LIB:-rf24}
LIB_VERSION=${LIB_VERSION:-$(awk -F "=" '/version/ {print $2}' library.properties)}
LIB_DEPRECATE_NAME=${LIB_DEPRECATE_NAME:-"rf24-bcm"}
LIB_DEPRECATE_VERSION=${LIB_DEPRECATE_VERSION:-""}
CC=${CC:-gcc}
CXX=${CXX:-g++}
ARCH_DIR=${ARCH_DIR:-utility}


if [ -z "${SOC}" ]; then
    echo "[SECTION] Detecting target machine."
    info=($(detect_machine))
    SOC=${info[0]}
    TYPE=${info[1]}
    CPU=${info[2]}
    echo "[OK] machine detected: SoC=${SOC}, Type=${TYPE}, CPU=${CPU}."
fi

if [ -z "${CPUFLAGS}" ]; then
    CPUFLAGS=$(gcc_cpu_flags $SOC)
fi


#*******************************************
# DRIVER detection
if [ -z "${DRIVER}" ]; then
    echo "[SECTION] Detecting DRIVER"
    DRIVER=$(detect_driver)
    if [ -z "${DRIVER}" ]; then
        die "No supported driver detected. Run configure with --driver=<driver> to set a driver explicitly." 1
    fi
    echo "  [OK] DRIVER detected:${DRIVER}."
fi

case ${DRIVER} in
wiringPi)
    SHARED_LINKER_LIBS+=" -pthread -lwiringPi"
    CFLAGS+=" -lwiringPi"
    ;;
SPIDEV)
    SHARED_LINKER_LIBS+=" -pthread"
    ;;
RPi)
    SHARED_LINKER_LIBS+=" -pthread"
    ;;
MRAA)
    SHARED_LINKER_LIBS+=" -lmraa"
    ;;
LittleWire)
    SHARED_LINKER_LIBS+=" -llittlewire-spi"
    ;;
*)
    die "Unsupported DRIVER: ${DRIVER}." 2
    ;;
esac

#*******************************************
# OS detection
if [ -z "${OS}" ]; then
    echo "[SECTION] Detecting OS."
    OS=$(execute_check "uname")
    OS=${OS^^}
    echo "  [INFO] OS detected:${OS}."
fi

case ${OS} in
LINUX)
    DYN_SUFFIX=so
    SHARED_LINKER_FLAGS+=" -shared -Wl,-soname,lib${LIB}.${DYN_SUFFIX}.${LIB_VERSION%%.*}"
    ;;
DARWIN)
    DYN_SUFFIX=dylib
    SHARED_LINKER_FLAGS+=" -dynamiclib -install_name ${LIB_DIR}/lib${LIB}.${DYN_SUFFIX}.${LIB_VERSION%%.*}"
    ;;
*)
    die "Unsupported OS: ${OS}." 3
    ;;
esac


LIBNAME=${LIBNAME:-lib${LIB}.${DYN_SUFFIX}.${LIB_VERSION}}
LIBSYMLINKS="${LIBSYMLINKS:-$(gen_symlink_names lib${LIB}.${DYN_SUFFIX} ${LIB_VERSION})}"
if [ "${LIB_DEPRECATE_NAME}" ]; then
    LIBDEPRECATE="${LIBDEPRECATE:-lib${LIB_DEPRECATE_NAME}.${DYN_SUFFIX}}"
    if [ "${LIB_DEPRECATE_VERSION}" ]; then
        LIBDEPRECATE="${LIBDEPRECATE}.${LIB_DEPRECATE_VERSION}"
    fi
fi
DRIVER_DIR=${DRIVER_DIR:-${ARCH_DIR}/${DRIVER}}
CFLAGS="$CPUFLAGS -Ofast -Wall -pthread $CFLAGS"

echo "[SECTION] Preparing configuration."
cp ${DRIVER_DIR}/includes.h ${ARCH_DIR}/includes.h

echo "[SECTION] Saving configuration."
echo -n "" > Makefile.inc
for param in ${params}; do
    if [[ ${!param} ]]; then
        echo "${param}=${!param}" >> Makefile.inc
    fi
done

if [ -z "${NO_CLEAN}" ]; then
    echo "[SECTION] Cleaning previous builds."
    make clean >/dev/null
fi


echo "[OK] Finished."