#! /bin/bash
#
# Copyright 2020, Stormux, <storm_dragon@linux-a11y.org>
#
# This is free software; you can redistribute it and/or modify it under the
# terms of the GNU General Public License as published by the Free
# Software Foundation; either version 3, or (at your option) any later
# version.
#
# This software is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
# General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this package; see the file COPYING.  If not, write to the Free
# Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
# 02110-1301, USA.
#

# keep track of mounted status for exit function
mounted=1

set -e # Don't want to destroy stuff if this goes majorly wrong.
trap cleanup EXIT # make sure the script cleans up after itself before closing.


cleanup() {
    if [[ $mounted -eq 0 ]]; then
        umount -R /mnt
        partx -d "${loopdev}"
        losetup --detach "${loopdev}"
    fi
    if [[ -n "${imageFileName}" ]]; then
        rm "${imageFileName}"
    fi
    exit 0
}

help() {
    echo -e "Usage:\n"
    echo "With no arguments, build with default parameters."
    for i in "${!command[@]}" ; do
        echo "-${i/:/ <parameter>}: ${command[${i}]}"
    done | sort
    exit 0
}

# Array of command line arguments
declare -A command=(
    [h]="This help screen."
    [l:]="Language default is en_US."
    [n:]="Image name, default is stormux-pi<32|64>-<yyyy-mm-dd>.img"
    [s:]="image size in GB, default is 4."
    [v:]="Version of the Raspberry Pi for which you are building. (32|64) default is 64."
)

# Convert the keys of the associative array to a format usable by getopts
args="${!command[*]}"
args="${args//[[:space:]]/}"
while getopts "${args}" i ; do
    case "$i" in
        h) help ;;
        l)
            imageLanguage="${OPTARG}.UTF-8"
            ;;
        n)
            imageName="${OPTARG}"
            ;;
        s)
            if [[ "${OPTARG}" =~ ^[[:digit:]]+$ ]]; then
                imageSize="${OPTARG}G"
            else
                echo "Image size must be numeric."
                exit 1
            fi
            ;;
        v)
            if [[ "${OPTARG}" =~ ^32|64$ ]]; then
                imageVersion="${OPTARG}"
            else
                echo "Image version must be 32 for 32 bit (armv7h), or 64 for 64 bit (aarch64 default)."
                exit 1
            fi
            ;;
        *)
            exit 1
            ;;
    esac
done

# make sure variables are set, or use defaults.
export imageVersion="${imageVersion:-64}"
export imageSize="${imageSize:-4G}"
imageName="${imageName:-stormux-pi4-${imageVersion}-$(date '+%Y-%m-%d').img}"
imageName="${imageName/-64-/-aarch64-}"
imageName="${imageName/-32-/-armv7h-}"
export imageName
export imageLanguage="${imageLanguage:-en_US.UTF-8}"

# Make sure the image file doesn't exist.
if [[ -e "$imageName" ]]; then
    echo "${imageName} exists, please remove or move it for this script to continue."
    exit 1
fi

# Make sure this script is ran as root.
if [ "$(whoami)" != "root" ] ; then
    echo "Error: This script must be run as root."
    exit 1
fi

# make sure the needed tools are installed
if [[ "$(uname -m)" == "x86_64" ]]; then
    if ! pacman -Q qemu-user-static &> /dev/null ; then
        echo "Please install qemu-user-static and qemu-user-static-binfmt before continuing."
        exit 1
    fi
    if ! pacman -Q qemu-user-static-binfmt &> /dev/null ; then
        echo "Please install qemu-user-static and qemu-user-static-binfmt before continuing."
        exit 1
    fi
fi
for i in dosfstools parted wget ; do
    if ! pacman -Q $i &> /dev/null ; then
        echo "Please install $i before continuing."
        exit 1
    fi
done


# Url for the image to be downloaded.
url[32]="http://os.archlinuxarm.org/os/ArchLinuxARM-rpi-armv7-latest.tar.gz"
url[64]="http://os.archlinuxarm.org/os/ArchLinuxARM-rpi-aarch64-latest.tar.gz"

fallocate -l "$imageSize" "$imageName"
loopdev="$(losetup --find --show "${imageName}")"
parted --script "${loopdev}" mklabel msdos mkpart primary fat32 0% 200M mkpart primary ext4 200M 100%
mkfs.vfat -F32 "${loopdev}p1"
mkfs.ext4 -F "${loopdev}p2"
mount "${loopdev}p2" /mnt
mkdir /mnt/boot
mount "${loopdev}p1" /mnt/boot
# Things are mounted now, so set mounted to 0 (bash true)
mounted=0
imageFileName=$(mktemp)
wget "${url[$imageVersion]}" -O "${imageFileName}"
if [[ $imageVersion -eq 32 ]]; then
    # Workaround for bsdtar errors when extracting 32 bit image.
    set +e
fi
bsdtar -xpf "${imageFileName}" -C /mnt
# Set -e in case it got unset for 32 bit image
set -e
arch-chroot /mnt << EOF
# set up pacman
pacman-key --init
pacman-key --populate archlinuxarm
pacman -Syy
# Change kernels for aarch64
if [[ "$imageVersion" == "64" ]]; then
pacman -R --noconfirm linux-aarch64 uboot-raspberrypi
pacman -S --noconfirm linux-rpi
fi

# Install packages
pacman -Su --needed --noconfirm \
    alsa-firmware \
    alsa-utils \
    base \
    base-devel \
    bash-completion \
    bluez \
    bluez-utils \
    brltty \
    cloud-utils \
    cronie \
    dbus-broker \
    espeak-ng \
    fake-hwclock \
    git \
    go \
    magic-wormhole \
    man \
    man-pages \
    networkmanager \
    ntp \
    pipewire \
    pipewire-alsa \
    pipewire-jack \
    pipewire-pulse \
    python-pyudev \
    python-daemonize \
    python-evdev \
    python-dbus \
    python-pyte \
    raspberrypi-firmware \
    realtime-privileges \
    rhvoice-voice-bdl \
    rng-tools \
    rsync \
    sox \
    w3m \
    wget \
    wireless-regdb \
    wireplumber \
    xdg-user-dirs \
    xdg-utils

# set the language
sed -i "s/#$imageLanguage/$imageLanguage/" /etc/locale.gen
echo "LANG=$imageLanguage" > /etc/locale.conf
locale-gen
# Configure and enable Hardware Random Number Generator
echo 'RNGD_OPTS="-o /dev/random -r /dev/hwrng"' > /etc/conf.d/rngd
systemctl enable rngd.service
# Set the distribution name.
echo 'Stormux \r (\l)' > /etc/issue
echo >> /etc/issue
# Change the alarm user to be stormux
usermod -a -g users -G wheel,realtime,audio,video,network,brlapi -m -d /home/stormux -l stormux alarm
# Grant sudo privileges to the stormux user for package installation.
echo 'stormux ALL=(ALL) NOPASSWD: ALL' >> /etc/sudoers.d/wheel
# Set the password for the root user
echo -e "root\nroot" | passwd "root"
# Set the password for the stormux user
echo -e "stormux\nstormux" | passwd "stormux"
# Change to the stormux user and install some packages
sudo -iu stormux
# Create desktop, downloads, music, and other directories.
xdg-user-dirs-update
# Build AUR packages
export aurPackages=(fenrir-git \
    growpartfs \
    log2ram \
    yay)
export PKGDEST=~/packages
for p in "\${aurPackages[@]}" ; do
    git clone https://aur.archlinux.org/\${p}.git
    cd ~/\${p}
    makepkg -A
    cd ~
    rm -rf \${p}
done
exit
# Install built packages
for p in /home/stormux/packages/* ; do
    pacman -U --noconfirm \${p}
done
rm -rf /home/stormux/packages/
# Enable linger so that hopefully sound will start at login.
mkdir -p /var/lib/systemd/linger
touch /var/lib/systemd/linger/stormux
systemctl --global enable dbus-broker.service pipewire.service pipewire-pulse.service wireplumber.service
/usr/share/fenrirscreenreader/tools/configure_pipewire.sh
sudo -u stormux /usr/share/fenrirscreenreader/tools/configure_pipewire.sh
# Configure sudo for group wheel, remove nopasswd for the stormux user
echo '%wheel ALL=(ALL) ALL' > /etc/sudoers.d/wheel
# Set the hostname
echo stormux > /etc/hostname
# Configure services
systemctl enable brltty.path cronie.service dbus-broker.service fake-hwclock.service fenrirscreenreader.service log2ram.service NetworkManager.service ntpd.service
systemctl disable dbus.service
# Cleanup packages
pacman -Sc --noconfirm
pacman -R --noconfirm go

# Update fstab for Raspberry Pi 4. Not needed until linux-aarch64 works.
# [[ $imageVersion -eq 4 ]] && sed -i 's/mmcblk0/mmcblk1/g' /etc/fstab
EOF

# Copy override files into place.
cp -rv ../files/boot/* /mnt/boot
cp -rv ../files/etc/* /mnt/etc
cp -rv ../files/var/* /mnt/var
cp -rv ../files/usr/* /mnt/usr

# Exiting calls the cleanup function to unmount.
exit 0