cat > wpa_supplicant.conf <<EOF
ctrl_interface=DIR=/var/run/wpa_supplicant GROUP=netdev
update_config=1
country=US

network={
    ssid="this-is-wifi"
    psk="zeroshaha"
    key_mgmt=WPA-PSK
    scan_ssid=1
}
EOF
touch ssh

# first time
sudo raspi-config #extent file system and hostname

sudo sed -i 's%#PermitRootLogin prohibit-password%PermitRootLogin yes%' /etc/ssh/sshd_config
sudo passwd root #reset the passwd for root 
sudo reboot

# second time
usermod -l nick pi && groupmod -n nick pi && usermod -d /home/nick -m nick #change user/group name and reset home
sed -i 's%PermitRootLogin yes%%' /etc/ssh/sshd_config

usermod -p ! root # reset password for root to impossible

cd ~
git clone https://github.com/mstorsjo/fdk-aac
cd fdk-aac
libtoolize
autoreconf --install
mkdir build && cd build
../configure --prefix=/usr
make
make install

cd ~
sudo apt install libasound2-dev libbluetooth-dev libsbc-dev
git clone https://github.com/Arkq/bluez-alsa.git
cd bluez-alsa
mkdir build && cd build
autoreconf --install
mkdir build && cd build
../configure --enable-aac --enable-debug
make
make install

sudo ln -s /usr/lib/alsa-lib/libasound_module_ctl_bluealsa.so /usr/lib/arm-linux-gnueabihf/alsa-lib/libasound_module_ctl_bluealsa.so
sudo ln -s /usr/lib/alsa-lib/libasound_module_pcm_bluealsa.so /usr/lib/arm-linux-gnueabihf/alsa-lib/libasound_module_pcm_bluealsa.so

echo export LIBASOUND_THREAD_SAFE=0 >> ~/.bashrc

tee /lib/udev/rules.d/62-bluealsa.rules <<EOF 
ACTION=="add", KERNEL=="hci0", ENV{SYSTEMD_WANTS}+="bluealsa.service"
EOF

cat <<EOF > /lib/systemd/system/bluealsa.service
[Unit]
Description=BluezAlsa proxy (modified)
Requires=bluetooth.service
After=bluetooth.target bluetooth.service

[Service]
Type=simple
ExecStart=/usr/bin/bluealsa

[Install]
WantedBy=multi-user.target
EOF

# need to disable it if pulseaudio installed 
sudo mv /usr/share/alsa/pulse-alsa.conf{,.bak}
sudo mv /usr/share/alsa/alsa.conf.d/50-pulseaudio.conf{,.bak}
sudo mv /usr/share/alsa/alsa.conf.d/pulse.conf{,.bak}
sudo systemctl disable pulseaudio

sudo bluetoothctl
#>> power on
#>> scan on 
#>> remove FC:58:FA:30:6B:6A 
#>> pair FC:58:FA:30:6B:6A
#>> trust FC:58:FA:30:6B:6A
#>> connect FC:58:FA:30:6B:6A

cat <<EOF > /etc/asound.conf
pcm.!default {
  type asym
  capture.pcm "mic"
  playback.pcm "bluetooth"
}

ctl.!default {
	type bluealsa
}

pcm.bluetooth {
	type plug
	slave.pcm {
		type bluealsa
		device "FC:58:FA:30:6B:6A"
		profile "a2dp"
	}
	hint {
		show on
		description "Use the A2 bluetooth headset with Blue-Alsa module as default"
	}
}

pcm.mic {
  type plug
  slave {
    pcm "plughw:1,0"
  }
}
EOF

cat >> /boot/config.txt <<EOF
dtoverlay=pi3-disable-wifi
#dtoverlay=pi3-disable-bt
EOF
sudo systemctl stop bluetooth.service && sudo systemctl disable bluetooth.service
sudo systemctl stop hciuart.service && sudo systemctl disable hciuart.service

echo export https_proxy=http://127.0.0.1:8123 >> ~/.bashrc
echo export http_proxy=http://127.0.0.1:8123 >> ~/.bashrc
cat >> /etc/hosts <<EOF
192.168.1.8	pi.local
EOF

cat > /etc/apt/apt.conf.d/05proxy <<EOF
Acquire::http::Proxy "http://pi.local:3142";
EOF

sudo apt update

# remote file system
sudo apt install autofs cifs-utils
cat | sudo tee /etc/smbcredentials <<EOF
username=$USERNAME
password=$PASSWORD
EOF
sudo chown nick:nick /etc/smbcredentials
chmod 600 /etc/smbcredentials

cat | sudo tee /etc/auto.home <<EOF
/data            -fstype=cifs,credentials=/etc/smbcredentials,uid=1000,gid=1000 ://pi.local/data
/media            -fstype=cifs,credentials=/etc/smbcredentials,uid=1000,gid=1000 ://pi.local/media
#/home/user -fstype=fuse,rw,nodev,nonempty,noatime,allow_other,workaround=rename,ssh_command=/usr/local/sbin/ssh_user :sshfs\#user@host\:/home/user
EOF
cat | sudo tee -a /etc/auto.master <<EOF
/- /etc/auto.home uid=1000,gid=1000,--timeout=30,--ghost
EOF

# audio system
sudo apt install -y cmus
mkdir -p ~/.cmus && echo "set output_plugin=alsa" > ~/.cmus/rc

# snowboy
sudo apt-get install python3-pyaudio sox libatlas3-base
mkdir -p ~/snowboy && curl -L https://github.com/kitt-ai/snowboy/tarball/v1.3.0 | tar zx -C snowboy --strip 1
curl 'https://transfer.sh/VtbYX/snowboy_py3-.tar.gz' |tar -xz -C snowboy --strip 1
curl 'https://s3-us-west-2.amazonaws.com/snowboy/snowboy-releases/rpi-arm-raspbian-8.0-1.1.1.tar.bz2' |tar -xj -C snowboy --strip 1
python3 demo.py resources/models/snowboy.umdl

# enable the dwc2 kernel module
echo "dtoverlay=dwc2" | sudo tee -a /boot/config.txt
# make the pi work as ether gadget when dwc2 module loaded
sed -i 's#rootwait$#rootwait modules-load=dwc2,g_ether#' /boot/cmdline.txt

# configure the static IP for the USB PI, need to manually set the IP of your PC in the same network
cat > /etc/network/interfaces.d/usb0 <<EOF
allow-hotplug usb0
iface usb0 inet static
        address 192.168.7.2
        netmask 255.255.255.0
        network 192.168.7.0
        broadcast 192.168.7.255
        gateway 192.168.7.1
EOF