#!/usr/bin/env bash

function press_any_key {
  echo "Press any key to continue or Ctrl+c to abort..."
  read -n1 DISCARD_ME
}

function are_you_really_really_sure {
  echo "Enter the following to continue: $1"
  read -p "> " DISCARD_ME
  if [ "$1" = "$DISCARD_ME" ]; then
    return 0
  else
    return 1
  fi
}

function yesno {
  unset DISCARD_ME
  while [ -z "$DISCARD_ME" ]; do
    read -p "[y/n] " -n1 DISCARD_ME
    case "$DISCARD_ME" in
      y)
        return 0
        ;;
      n)
        return 1
        ;;
      *)
        echo " Please enter y for yes or n for no."
        unset DISCARD_ME
        ;;
    esac
  done
}

function run_in_target {
  echo "$@" | xchroot /mnt/target sh
}

clear
echo "
This script will now download and install Void Linux on your USB stick.
Any data that is currently on the stick will be lost and it won’t be
usable from Windows or MacOS.

Before we begin, the following packages need to be installed (if not installed already):
- xmirror
- squashfs-tools
- wget
- xtools-minimal"
press_any_key

xbps-install --sync
xbps-install --yes --update xbps
xbps-install --yes xmirror squashfs-tools wget xtools-minimal

#TODO: If going down the path of extracting routines from void-installer and
# xmirror, that should be done here.

#TODO: Select keyboard layout
KBD_LAYOUT="de-latin1"

clear
echo "Select the USB stick to install to (NAME column below)...
"
# exclude loop devices
lsblk --exclude 7 --nodeps --output NAME,SIZE,MODEL
echo ""
read -p "> " TARGET_DISK

while [ ! -b "/dev/$TARGET_DISK" ]; do
  lsblk --exclude 7 --nodeps --output NAME,SIZE,MODEL
  echo "$TARGET_DISK is not a valid device!"
  read -p "> " TARGET_DISK
done

clear
echo "Selected device:"
lsblk --output NAME,SIZE,MODEL,LABEL,FSTYPE "/dev/$TARGET_DISK"
echo "
WARNING: The selected device will be wiped, partitioned, and formatted.
         ALL DATA ON IT WILL BE LOST PERMANENTLY.
         It will not be usable with Windows or MacOS while holding Void.
"
if are_you_really_really_sure "Yes, erase it."; then
  true
else
  echo "Aborting."
  exit 1
fi

# new GPT
# 2M BIOS GRUB
# 268M ESP
# 1G boot
# everything else one big partition
echo "g
n


+2M
n


+268M
n


+1G
n



t
1
4
t
2
1
t
3
136
t
4
20
w" | fdisk --wipe always --wipe-partitions always "/dev/$TARGET_DISK"
TARGET_PART_BIOS="$(lsblk --raw --noheadings --output PATH "/dev/$TARGET_DISK" | sed -n '2p')"
TARGET_PART_EFI="$(lsblk --raw --noheadings --output PATH "/dev/$TARGET_DISK" | sed -n '3p')"
TARGET_PART_BOOT="$(lsblk --raw --noheadings --output PATH "/dev/$TARGET_DISK" | sed -n '4p')"
TARGET_PART_BIG="$(lsblk --raw --noheadings --output PATH "/dev/$TARGET_DISK" | sed -n '5p')"

mkfs.vfat -F32 -n "EFIBOOT" "$TARGET_PART_EFI"
mkfs.f2fs -f -l "boot" "$TARGET_PART_BOOT"
mkfs.f2fs -f -l "container" "$TARGET_PART_BIG"

mkdir -p /mnt/target
mount -t tmpfs -o size=3g tmpfs /mnt/target
#TODO don't use default permissions for tmpfs
mkdir /mnt/target/boot
mount "$TARGET_PART_BOOT" /mnt/target/boot
mkdir /mnt/target/boot/efi
mount "$TARGET_PART_EFI" /mnt/target/boot/efi
mkdir /mnt/target/container
mount "$TARGET_PART_BIG" /mnt/target/container
mkdir /mnt/target/home
mkdir /mnt/target/container/home
mount --bind /mnt/target/container/home /mnt/target/home

clear
echo "Storage is now prepared and ready for installation.

You need to select a download mirror for Void next.
The script will launch xmirror on the host/live system and determine
the chosen mirror from the config file it generates.
"
press_any_key

xmirror
#TODO: also remove CPU architecture
TARGET_MIRROR="$(sed 's/repository=//;s|/musl$||' /etc/xbps.d/00-repository-main.conf)"

#TODO: select installation type
TARGET_TYPE="x86_64"

#TODO: also add CPU architecture
if grep "musl" <<< "$TARGET_TYPE"; then
  TARGET_MIRROR="$TARGET_MIRROR/musl"
fi

mkdir -p /mnt/target/var/db/xbps/keys
cp /var/db/xbps/keys/* /mnt/target/var/db/xbps/keys/

XBPS_ARCH="$TARGET_TYPE" xbps-install --yes --sync --rootdir /mnt/target --repository "$TARGET_MIRROR" \
  linux bash shadow f2fs-tools dosfstools dbus NetworkManager iana-etc \
  iw wpa_supplicant util-linux which tar man-pages iproute2 iputils \
  wifi-firmware traceroute grep gzip file sed gawk less coreutils findutils \
  diffutils pciutils usbutils tzdata base-files ncurses mdocml procps-ng \
  kbd xbps sudo ethtool kmod eudev runit-void removed-packages nano acpid \
  squashfs-tools grub grub-i386-efi grub-x86_64-efi dracut

echo "repository=$TARGET_MIRROR" > /mnt/target/etc/xbps.d/00-repository-main.conf

echo "%wheel ALL=(ALL:ALL) ALL" > /mnt/target/etc/sudoers.d/wheel_as_sudo_group.conf

# TODO: add overlayfs scripts (bootup and shutdown)

echo "# See fstab(5).
# <device> <mount point> <fstype> <options> <dump> <pass>

# / and /container are mounted by a script in initramfs
# TODO: add script path

UUID=$(blkid --output value --match-tag UUID $TARGET_PART_BOOT) /boot f2fs defaults,nodev,nosuid 0 2
UUID=$(blkid --output value --match-tag UUID $TARGET_PART_EFI) /boot/efi vfat defaults,fmask=0077,dmask=0077 0 2
/container/home /home none bind 0 0
" > /mnt/target/etc/fstab

if grep "#KEYMAP=" /mnt/target/etc/rc.conf; then
  sed -i -e 's/#KEYMAP=.*/KEYMAP="'"$KBD_LAYOUT"'"/' /mnt/target/etc/rc.conf
else
  clear
  echo "WARNING: Could not locate the keymap setting in rc.conf."
  echo "The script will attempt to add one."
  echo ""
  press_any_key
  echo "" >> /mnt/target/etc/rc.conf
  echo "# Install script could not find keymap setting, adding one here." >> /mnt/target/etc/rc.conf
  echo "KEYMAP=\"$KBD_LAYOUT\"" >> /mnt/target/etc/rc.conf
fi

#TODO timezone

clear
echo "Is the hardware clock set to UTC?

Most Unix/Linux systems set the clock in your computer to UTC and add
the time zone on-the-fly. If you use Windows, you will want to answer no here.
"
if yesno; then
  if grep "#HARDWARECLOCK=" /mnt/target/etc/rc.conf; then
    sed -i -e 's/#HARDWARECLOCK=.*/HARDWARECLOCK="UTC"/' /mnt/target/etc/rc.conf
  else
    clear
    echo "WARNING: Could not locate the hardwareclock setting in rc.conf."
    echo "The script will attempt to add one."
    echo ""
    press_any_key
    echo "" >> /mnt/target/etc/rc.conf
    echo "# Install script could not find hardwareclock setting, adding one here." >> /mnt/target/etc/rc.conf
    echo 'HARDWARECLOCK="UTC"' >> /mnt/target/etc/rc.conf
  fi
else
  if grep "#HARDWARECLOCK=" /mnt/target/etc/rc.conf; then
    sed -i -e 's/#HARDWARECLOCK=.*/HARDWARECLOCK="localtime"/' /mnt/target/etc/rc.conf
  else
    clear
    echo "WARNING: Could not locate the hardwareclock setting in rc.conf."
    echo "The script will attempt to add one."
    echo ""
    press_any_key
    echo "" >> /mnt/target/etc/rc.conf
    echo "# Install script could not find hardwareclock setting, adding one here." >> /mnt/target/etc/rc.conf
    echo 'HARDWARECLOCK="localtime"' >> /mnt/target/etc/rc.conf
  fi
fi

clear
echo "Do you want to set a hostname?

This is equivalent to giving a name to your computer - except it's a system
on a USB drive.

If you leave this empty, it will be set to void-usb.
Allowed characters are a-zA-Z0-9 (and - in the middle).
"
while [ -z "$TARGET_HOSTNAME" ]; do
  read -p "> " TARGET_HOSTNAME
  if [ -z "$TARGET_HOSTNAME" ]; then
    TARGET_HOSTNAME="void-usb"
  else
    if grep -e "^[a-zA-Z0-9][a-zA-Z0-9-]*[a-zA-Z0-9]$" -e "^[a-zA-Z0-9]*$" <<< "$TARGET_HOSTNAME" > /dev/null 2>&1; then
      true
    else
      echo "Allowed characters are a-zA-Z0-9 (and - in the middle)."
      unset TARGET_HOSTNAME
    fi
  fi
done

echo "$TARGET_HOSTNAME" > /mnt/target/etc/hostname

mkdir /mnt/target/boot/efi/LOADER
echo "GRUB has been deliberately installed to a non-standard location.
This avoids default kernel hooks breaking the custom config." > /mnt/target/boot/efi/LOADER/README.TXT

# no idea if any of these are even necessary/relevant but it can’t hurt...
TARGET_PRELOAD_GRUB_MODULES="usb usbms uhci ehci ohci part_gpt f2fs"
run_in_target grub-install --target=i386-pc --boot-directory=/boot/efi/LOADER --disk-module=native --modules="'$TARGET_PRELOAD_GRUB_MODULES'" "'/dev/$TARGET_DISK'"
run_in_target grub-install --target=i386-efi --boot-directory=/boot/efi/LOADER --efi-directory=/boot/efi --removable --no-nvram --modules="'$TARGET_PRELOAD_GRUB_MODULES'" "'/dev/$TARGET_DISK'"
run_in_target grub-install --target=x86_64-efi --boot-directory=/boot/efi/LOADER --efi-directory=/boot/efi --removable --no-nvram --modules="'$TARGET_PRELOAD_GRUB_MODULES'" "'/dev/$TARGET_DISK'"

mkdir -p /mnt/target/opt/void-usb
chmod 755 /mnt/target/opt/void-usb
wget --output-document=/mnt/target/opt/void-usb/grub-config https://lostcave.ddnss.de/git/BodgeMaster/void-minecraft-usb/raw/branch/master/opt/grub-config
chmod 744 /mnt/target/opt/void-usb/grub-config

#TODO: ensure that this is being run by xbps-reconfigure -fa, if not add it here
# run_in_target /opt/void-usb/grub-config

wget --output-document=/mnt/target/etc/kernel.d/pre-install/99-void-usb https://lostcave.ddnss.de/git/BodgeMaster/void-minecraft-usb/raw/branch/master/kernel.d/pre-install/99-void-usb
chmod 744 /mnt/target/etc/kernel.d/pre-install/99-void-usb
wget --output-document=/mnt/target/etc/kernel.d/post-install/99-void-usb https://lostcave.ddnss.de/git/BodgeMaster/void-minecraft-usb/raw/branch/master/kernel.d/post-install/99-void-usb
chmod 744 /mnt/target/etc/kernel.d/post-install/99-void-usb
wget --output-document=/mnt/target/etc/kernel.d/post-remove/99-void-usb https://lostcave.ddnss.de/git/BodgeMaster/void-minecraft-usb/raw/branch/master/kernel.d/post-remove/99-void-usb
chmod 744 /mnt/target/etc/kernel.d/post-remove/99-void-usb

run_in_target xbps-reconfigure -fa

#