#!/bin/bash
# This version is heavily based on the work of mz-fuzzy (https://github.com/mz-fuzzy)
# adapted to work with MySensors project.
# Original work: https://github.com/TMRh20/RF24/blob/master/configure

function help {
cat <<EOF
configure script for MySensors gateway.
Options:

Help:
    -h, --help                  print this message

Building options:
    --soc=[BCM2835|BCM2836|AM33XX|A10|A13|A20|H3]
                                SoC type to be used. [configure autodetected]
    --cpu-flags=<CXXFLAGS>      CPU defining/optimizing flags to be used. [configure autodetected]
    --extra-cxxflags=<CXXFLAGS> Extra C flags passed to C/C++ compilation. []
    --extra-ldflags=<LDFLAGS>   Extra C flags passed to linking. []
    --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]
    --gateway-dir=<DIR>         Gateway files installation directory. [PREFIX/bin]       

MySensors options:
    --my-debug=[enable|disable] Enables or disables MySensors core debugging. [enable]
    --my-config-file=<FILE>     Config file path. [/etc/mysensors.dat]
    --my-gateway=[ethernet|serial|mqtt]
                                Gateway type, set to none to disable gateway feature. [ethernet]
    --my-node-id=<ID>           Disable gateway feature and run as a node with given id.
    --my-controller-url-address=<URL>
                                Controller or MQTT broker url.
    --my-controller-ip-address=<IP>
                                Controller or MQTT broker ip.
    --my-port=<PORT>            The port to keep open on gateway mode.
                                If gateway is set to mqtt, it sets the broker port.
    --my-serial-port=<PORT>     Serial port. [/dev/ttyACM0]
    --my-serial-baudrate=<BAUD> Serial baud rate. [115200]
    --my-serial-is-pty          Set the serial port to be a pseudo terminal. Use this if you want
                                to connect to a controller running on the same device.
    --my-serial-pty=<NAME>      Symlink name for the PTY device. [/dev/ttyMySensorsGateway]
    --my-serial-groupname=<GROUP>
                                Grant access to the specified system group for the serial device.
    --my-mqtt-client-id=<ID>    MQTT client id.
    --my-mqtt-publish-topic-prefix=<PREFIX>
                                MQTT publish topic prefix.
    --my-mqtt-subscribe-topic-prefix=<PREFIX>
                                MQTT subscribe topic prefix.
    --my-transport=[none|nrf24|rs485]
                                Transport type, set to none to disable transport feature. [nrf24]
    --my-rf24-channel=<0-125>   RF channel for the sensor net, 0-125. [76]
    --my-rf24-pa-level=[RF24_PA_MAX|RF24_PA_LOW]
                                RF24 PA level. [RF24_PA_MAX]
    --my-rf24-irq-pin=<PIN>     Pin number connected to nRF24L01 IRQ pin.
    --my-rx-message-buffer-size=<SIZE>
                                Buffer size for incoming messages when using rf24 interrupts. [20]
    --my-rs485-serial-port=<PORT>
                                RS485 serial port. You must provide a port.
    --my-rs485-baudrate=<BAUD>  RS485 baudrate. [9600]
    --my-rs485-de-pin=<PIN>     Pin number connected to RS485 driver enable pin.
    --my-rs485-max-msg-length=<LENGTH>
                                The maximum message length used for RS485.
    --my-leds-err-pin=<PIN>     Error LED pin.
    --my-leds-rx-pin=<PIN>      Receive LED pin.
    --my-leds-tx-pin=<PIN>      Transmit LED pin.
    --my-leds-blinking-inverse  Inverse the blinking feature.

EOF
}

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

function detect_rpi_revision {
    # get PI Revision from cpuinfo
    local pirev=$(eval "cat /proc/cpuinfo 2>/dev/null | grep Revision | cut -f 2 -d ':' | sed -e 's/^[[:space:]]*//' -e 's/[[:space:]]*$$//'")
    echo ${pirev}
}

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

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

    case $hardware in
    BCM2708)
        soc="BCM2835"
        if [[ $machine == "Raspberry"* ]]; then
            tp="RPi"
            rev=($(detect_rpi_revision))
        fi
        ;;
    BCM2709)
        soc="BCM2836"
        if [[ $machine == "Raspberry"* ]]; then
            rev=($(detect_rpi_revision))
            if [[ $rev == "a02082" || $rev == "a22082" ]]; then
                tp="RPi3"
            else
                tp="Rpi2"
            fi
        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} ${rev}"
}

function gcc_cpu_flags {
    local soc=$1
    case $soc in
    BCM2835)
        flags="-march=armv6zk -mtune=arm1176jzf-s -mfpu=vfp -mfloat-abi=hard -DLINUX_ARCH_RASPBERRYPI"
        ;;
    BCM2836)
        flags="-march=armv7-a -mtune=cortex-a7 -mfpu=neon-vfpv4 -mfloat-abi=hard -DLINUX_ARCH_RASPBERRYPI"
        ;;
    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}
}

# Default values
debug=enable
gateway_type=ethernet
transport_type=nrf24

params="SOC CXXFLAGS LDFLAGS PREFIX CXX GATEWAY_DIR INIT_SYSTEM"

for opt do
    if [ "$opt" = "-h" ] || [ "$opt" = "--help" ]; then
        help
        exit 0
    fi
    optarg="${opt#*=}"
    case "$opt" in
    --soc=*)
        SOC="$optarg"
        ;;
    --cpu-flags=*)
        CPUFLAGS="$optarg"
        ;;
    --extra-cxxflags=*)
        CXXFLAGS="$optarg"
        ;;
    --extra-ldflags=*)
        LDFLAGS="$optarg"
        ;;
    --cxx_compiler=*)
        CXX="$optarg"
        ;;
    --no-clean*)
        NO_CLEAN="1"
        ;;
    --prefix=*)
        PREFIX="$optarg"
        ;;
    --gateway-dir=*)
        GATEWAY_DIR="$optarg"
        ;;
    --my-debug=*)
        debug=${optarg}
        ;;
    --my-gateway=*)
        gateway_type=${optarg}
        ;;
    --my-node-id=*)
        gateway_type="none";
        CXXFLAGS="-DMY_NODE_ID=${optarg} $CXXFLAGS"
        ;;
    --my-config-file=*)
        CXXFLAGS="-DMY_LINUX_CONFIG_FILE=\\\"${optarg}\\\" $CXXFLAGS"
        ;;
    --my-transport=*)
        transport_type=${optarg}
        ;;
    --my-radio=*)
        echo "Warning: --my-radio is deprecated, please use --my-transport"
        transport_type=${optarg}
        ;;
    --my-serial-port=*)
        CXXFLAGS="-DMY_LINUX_SERIAL_PORT=\\\"${optarg}\\\" $CXXFLAGS"
        ;;
    --my-serial-baudrate=*)
        CXXFLAGS="-DMY_BAUD_RATE=${optarg} $CXXFLAGS"
        ;;
    --my-serial-is-pty*)
        CXXFLAGS="-DMY_IS_SERIAL_PTY $CXXFLAGS"
        ;;
    --my-serial-pty=*)
        CXXFLAGS="-DMY_LINUX_SERIAL_PTY=\\\"${optarg}\\\" $CXXFLAGS"
        ;;
    --my-serial-groupname=*)
        CXXFLAGS="-DMY_LINUX_SERIAL_GROUPNAME=\\\"${optarg}\\\" $CXXFLAGS"
        ;;
    --my-rf24-channel=*)
        CXXFLAGS="-DMY_RF24_CHANNEL=${optarg} $CXXFLAGS"
        ;;
    --my-rf24-pa-level=*)
        CXXFLAGS="-DMY_RF24_PA_LEVEL=${optarg} $CXXFLAGS"
        ;;
    --my-controller-url-address=*)
        CXXFLAGS="-DMY_CONTROLLER_URL_ADDRESS=\\\"${optarg}\\\" $CXXFLAGS"
        ;;
    --my-controller-ip-address=*)
        controller_ip=`echo ${optarg//./,}`
        CXXFLAGS="-DMY_CONTROLLER_IP_ADDRESS=${controller_ip} $CXXFLAGS"
        ;;
    --my-port=*)
        CXXFLAGS="-DMY_PORT=${optarg} $CXXFLAGS"
        ;;
    --my-mqtt-client-id=*)
        CXXFLAGS="-DMY_MQTT_CLIENT_ID=\\\"${optarg}\\\" $CXXFLAGS"
        ;;
    --my-mqtt-publish-topic-prefix=*)
        CXXFLAGS="-DMY_MQTT_PUBLISH_TOPIC_PREFIX=\\\"${optarg}\\\" $CXXFLAGS"
        ;;
    --my-mqtt-subscribe-topic-prefix=*)
        CXXFLAGS="-DMY_MQTT_SUBSCRIBE_TOPIC_PREFIX=\\\"${optarg}\\\" $CXXFLAGS"
        ;;
    --my-rf24-irq-pin=*)
        CXXFLAGS="-DMY_RX_MESSAGE_BUFFER_FEATURE -DMY_RF24_IRQ_PIN=${optarg} $CXXFLAGS"
        ;;
    --my-rx-message-buffer-size=*)
        CXXFLAGS="-DMY_RX_MESSAGE_BUFFER_SIZE=${optarg} $CXXFLAGS"
        ;;
    --my-rs485-serial-port=*)
        CXXFLAGS="-DMY_RS485_HWSERIAL=\\\"${optarg}\\\" $CXXFLAGS"
        ;;
    --my-rs485-baudrate=*)
        CXXFLAGS="-DMY_RS485_BAUD_RATE=${optarg} $CXXFLAGS"
        ;;
    --my-rs485-de-pin=*)
        CXXFLAGS="-DMY_RS485_DE_PIN=${optarg} $CXXFLAGS"
        ;;
    --my-rs485-max-msg-length=*)
        CXXFLAGS="-DMY_RS485_MAX_MESSAGE_LENGTH=${optarg} $CXXFLAGS"
        ;;
    --my-leds-err-pin=*)
        CXXFLAGS="-DMY_DEFAULT_ERR_LED_PIN=${optarg} $CXXFLAGS"
        ;;
    --my-leds-rx-pin=*)
        CXXFLAGS="-DMY_DEFAULT_RX_LED_PIN=${optarg} $CXXFLAGS"
        ;;
    --my-leds-tx-pin=*)
        CXXFLAGS="-DMY_DEFAULT_TX_LED_PIN=${optarg} $CXXFLAGS"
        ;;
    --my-leds-blinking-inverse*)
        CXXFLAGS="-DMY_WITH_LEDS_BLINKING_INVERSE $CXXFLAGS"
        ;;
    *)
        echo "[WARNING] Unknown option detected:$opt, ignored"
        ;;
    esac
done

PREFIX=${PREFIX:-/usr/local}
GATEWAY_DIR=${GATEWAY_DIR:-${PREFIX}/bin}
CXX=${CXX:-g++}

if [ -z "${SOC}" ]; then
    echo "[SECTION] Detecting target machine."
    info=($(detect_machine))
    SOC=${info[0]}
    TYPE=${info[1]}
    CPU=${info[2]}
    REV=${info[3]}
    echo "[OK] machine detected: SoC=${SOC}, Type=${TYPE}, CPU=${CPU}, REV=${REV}."
fi

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

CXXFLAGS="$CPUFLAGS -Ofast -g -Wall -Wextra $CXXFLAGS"
CFLAGS="-Ofast -g -Wall -Wextra $CFLAGS"

if [[ $TYPE == "RPi2" || $TYPE == "RPi3" || $REV == "0010" ]]; then
    CXXFLAGS+="-D__RPI_BPLUS"
fi

if [[ ${debug} == "enable" ]]; then
    CXXFLAGS="-DMY_DEBUG $CXXFLAGS"
fi

if [[ ${gateway_type} == "ethernet" ]]; then
    CXXFLAGS="-DMY_GATEWAY_LINUX $CXXFLAGS"
elif [[ ${gateway_type} == "serial" ]]; then
    CXXFLAGS="-DMY_GATEWAY_SERIAL $CXXFLAGS"
elif [[ ${gateway_type} == "mqtt" ]]; then
    CXXFLAGS="-DMY_GATEWAY_LINUX -DMY_GATEWAY_MQTT_CLIENT $CXXFLAGS"
fi

if [[ ${transport_type} == "nrf24" ]]; then
    CXXFLAGS="-DMY_RADIO_NRF24 $CXXFLAGS"
elif [[ ${transport_type} == "rs485" ]]; then
    CXXFLAGS="-DMY_RS485 $CXXFLAGS"
fi

LDFLAGS="-pthread $LDFLAGS"

if [ -x /usr/bin/systemctl ] || [ -x /bin/systemctl ]; then
    INIT_SYSTEM=systemd
    echo "[OK] init system detected: systemd"
elif [ -f /etc/init.d/cron ] && [ ! -h /etc/init.d/cron ]; then
    INIT_SYSTEM=sysvinit
    echo "[OK] init system detected: sysvinit"
else
    echo "[FAILED] unknown init system"
fi

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."