#!/bin/bash

pass="oem"
timezone="Europe/Berlin"


main="/tmp/vinstall"
target="${main}/target"
tmp_target="${main}/tmp_target"
vars="${target}/tmp/vinstaller/vars"

if [ $DEBUG ]; then
	umount -R ${target}/boot/efi ${target}/boot ${target}/tmp/vinstaller/ ${target}
	vgchange -an
	cryptsetup close /dev/mapper/luks*
	rm -rf $main
fi

mkdir -p $target $tmp_target

. ./etc/functions

target_phy_disk() {
	header "Choose target disk"
	local DISKS_DETAILS
	local output
	DISKS_DETAILS=$(lsblk -l -o KNAME,TYPE,SIZE,MODEL|grep disk)
	echo "$DISKS_DETAILS"
	multiplechoice $(echo "${DISKS_DETAILS}"|awk '{print $1}')
	TARGET_PHY_DISK="${output}"
}

target_phy_id() {
	local i
	local f2
	for i in $(find /dev/disk/by-id ! -type d|grep -v part); do
		if realpath "$i" | grep -q -i "$TARGET_PHY_DISK"; then
			if echo "$i" | grep -v "wwn" | grep -q -v "eui"; then
				TARGET_PHY_ID="$i"
				f2=1
			fi
		fi
	done
	if [ "$f2" == "1" ]; then
		return 0
	else
		err "no id found"
	fi
}

use_efi() {
	if test -e /sys/firmware/efi; then
		EFI=1
	else
		EFI=0
	fi
}

encryption_style() {
	ENC=1
	header "Choose encryption style"
	echo "a)keyfile in initramfs"						#bios: 1 uefi: 2
	echo "b)no encryption"								#bios: 2 uefi: 2
	#echo "not implemented:"
	#echo "c)no keyfile (double pw enter)"				#bios: 1 uefi: 2
	#echo "d)keyfile on usb"								#bios: 1 uefi: ?
	#echo "e)unencrypted boot"							#bios: 2 uefi: 2
	multiplechoice "a" "b" "c" "d" "e"
	ENCRYPTION_STYLE="$output"
	if [ "$ENCRYPTION_STYLE" == "b" ]; then
		ENC=0
	fi
}

hibernation() {
	ramsize="$(($(getconf _PHYS_PAGES) * $(getconf PAGE_SIZE) / (1024 * 1024)))"
	ramsize="$(awk "BEGIN { printf(\"%.0f\n\", ${ramsize}/1024); }")"
	HIBERNATE=1
	if [[ "${ramsize}" -lt "2" ]]; then
	        SWAPSIZE="$(( ramsize * 2 ))"
	        SWAPSIZE="$(( ramsize * 3 ))"
	elif [[ "${ramsize}" -ge "2" ]] && [[ "${ramsize}" -lt "8" ]]; then
	        SWAPSIZE="${ramsize}"
	        SWAPSIZE="$(( ramsize * 2 ))"
	elif [[ "${ramsize}" -ge "8" ]] && [[ "${ramsize}" -lt "16" ]]; then
	        SWAPSIZE="${ramsize}"
	        SWAPSIZE="$(awk "BEGIN { printf(\"%.0f\n\", ${ramsize}*1.5); }")"
	elif [[ "${ramsize}" -ge "16" ]]; then
	        SWAPSIZE="4"
	        echo "hibernate not recommended, turning off"
	        HIBERNATE="0"
	        SWAPSIZE="4"
	fi
}

do_partition() {
	header "do partition"
	start=1
	if [ "$EFI" == "1" ]; then
		parted $TARGET_PHY_ID -s -- mklabel gpt
		sleep 2
		size=512
		parted $TARGET_PHY_ID unit mib -s -- mkpart EFI fat32 $start $(( start + size ))
		parted $TARGET_PHY_ID unit mib -s -- set 1 esp on
		sleep 2
		start=$(( start + size ))
		parted $TARGET_PHY_ID unit mib -s -- mkpart root ext4 $start 100%
		sleep 2
		mkfs.vfat -F32 ${TARGET_PHY_ID}-part1
		TARGET_PART="2"
	else
		parted $TARGET_PHY_ID -s -- mklabel msdos
		sleep 2
		TARGET_PART="1"
		if [ "$ENCRYPTION_STYLE" == "b" ] || [ "$ENCRYPTION_STYLE" == "e" ]; then
			size=2048
			parted $TARGET_PHY_ID unit mib -s -- mkpart primary ext4 $start $(( start + size ))
			sleep 2
			start=$(( start + size ))
			mkfs.btrfs -f "${TARGET_PHY_ID}-part1"
			TARGET_PART="2"
		fi
		parted $TARGET_PHY_ID unit mib -s -- mkpart primary ext4 $start -1s
	fi
	sleep 2
	TARGETNAME=$(basename ${TARGET_PHY_ID}-part${TARGET_PART})
	TARGETNAME_UNDERSCORE=${TARGETNAME//-/_}
	T=/dev/disk/by-id/${TARGET_PHY_ID}-part${TARGET_PART}
	if [ "$ENCRYPTION_STYLE" == "a" ]; then
		T=/dev/mapper/luks_${TARGETNAME_UNDERSCORE}
		echo -n $pass | cryptsetup luksFormat ${TARGET_PHY_ID}-part${TARGET_PART} -d -
		#echo -n $pass | sudo cryptsetup luksOpen /dev/sdc1 sdc1  -d -
		echo -n $pass | cryptsetup luksOpen ${TARGET_PHY_ID}-part${TARGET_PART} "luks_${TARGETNAME_UNDERSCORE}" -d -
	fi
	vgcreate vg_${TARGETNAME_UNDERSCORE} $T
	lvcreate --name swap -L ${SWAPSIZE}G vg_${TARGETNAME_UNDERSCORE}
	lvcreate --name root -l 100%FREE vg_${TARGETNAME_UNDERSCORE}
	mkswap -f /dev/mapper/vg_${TARGETNAME_UNDERSCORE}-swap
	mkfs.btrfs -f /dev/mapper/vg_${TARGETNAME_UNDERSCORE}-root
	mount /dev/mapper/vg_${TARGETNAME_UNDERSCORE}-root $target
	btrfs subvol create ${target}/root
	btrfs subvol create ${target}/home
	umount $target
	mount /dev/mapper/vg_${TARGETNAME_UNDERSCORE}-root $target -o subvol=root
	if [ "$EFI" == "1" ]; then
		mkdir -p ${target}/boot/efi
		mount ${TARGET_PHY_ID}-part1 ${target}/boot/efi
	else
		if [ "$ENCRYPTION_STYLE" == "b" ] || [ "$ENCRYPTION_STYLE" == "e" ]; then
			mkdir -p ${target}/boot
			mount ${TARGET_PHY_ID}-part1 ${target}/boot
		fi
	fi

	for dir in dev proc sys run; do
		mkdir -p ${target}/$dir
		mount --rbind /$dir ${target}/$dir
		mount --make-rslave ${target}/$dir
	done
}

user() {
	header "Username"
	input "Username" "voiduser"
	USERNAME=$output
}

hostname() {
	header "Hostname"
	input "Hostname" "voidlinux"
	HOSTNAME=$output
}

base() {
	. ./etc/base
	packages
	reset packages
}

profile() {
	for i in $(find ./etc/profile/ -type f|sort); do
		profile+=("$(basename $i)")
	done
	if [ "${#profile[@]}" -gt "1" ]; then
		header "Select your Profile"
		multiplechoice "${profile[@]}"
		PROFILE=$output
	elif [ "${#profile[@]}" -eq "1" ]; then
		PROFILE=${profile[0]}
	fi
	if ! [ "${#profile[@]}" -eq "0" ]; then
		. ./etc/profile/$PROFILE
		packages
		reset packages
		cp ./etc/profile/$PROFILE $tmp_target
		if [ "$need_xserver" == "1" ]; then
			readin xserver
		fi
		if [ "$need_gfx" == "1" ]; then
			readin gfx
		fi
		if [ "$need_sound" == "1" ]; then
			readin soundsystem
		fi
	fi
}

lang() {
	header "Sprache"
	multiplechoice "de" "en"
	LANGUAGE=$output
	if [ "$LANGUAGE" == "de" ]; then
		L1=de_DE
	fi
}

do_install() {
	header "Installation"
	mkdir -p ${target}/var/db/xbps/keys
	cp /var/db/xbps/keys/* ${target}/var/db/xbps/keys
	xbps-install -Sy -R https://alpha.de.repo.voidlinux.org/current -r $target "${pkgs[@]}"
}

do_chroot() {
	header "Chroot into new System"
	mkdir -p ${target}/tmp/vinstaller/

	mount -t tmpfs -o size=50m tmpfs ${target}/tmp/vinstaller/
	mkdir -p ${target}/tmp/vinstaller/run
	cp ./etc/functions ${target}/tmp/vinstaller/
	cp ./etc/base ${target}/tmp/vinstaller/
	
	cp -rf $tmp_target ${target}/tmp/vinstaller/run
	
	echo "USERNAME=$USERNAME" > ${vars}
	echo "pass=$pass" >> ${vars}
	echo "HOSTNAME=$HOSTNAME" >> ${vars}
	echo "EFI=$EFI" >> ${vars}
	echo "LANGUAGE=$LANGUAGE" >> ${vars}
	echo "L1=$L1" >> ${vars}
	echo "TARGET_PHY_ID=$TARGET_PHY_ID" >> ${vars}
	echo "TARGET_PART=$TARGET_PART" >> ${vars}
	echo "TARGETNAME_UNDERSCORE=$TARGETNAME_UNDERSCORE" >> ${vars}
	echo "ENCRYPTION_STYLE=$ENCRYPTION_STYLE" >> ${vars}
	echo "timezone=$timezone" >> ${vars}
	echo "ENC=$ENC" >> ${vars}
	echo "HIBERNATE=$HIBERNATE" >> ${vars}

cat <<EOF > ${target}/tmp/vinstaller/main_chroot
#!/usr/bin/bash
. /tmp/vinstaller/functions
. /tmp/vinstaller/vars
. /tmp/vinstaller/base

for file in \$(find /tmp/vinstaller/run -type f); do
	header \"\$(basename \$file)\"
	. \$file
	config
	reset config
done
EOF

chmod +x ${target}/tmp/vinstaller/main_chroot
chroot ${target} /tmp/vinstaller/main_chroot
}

ready() {
	header "Ready!!"
	echo ""
	echo "login: ${USERNAME}:${pass}"
	echo "hostname: $HOSTNAME"
	echo "encryption: $ENC"
	echo "hibernation: $HIBERNATE"
	echo "pakete:"
	echo "${pkgs[@]}"
	cat ${vars}
}

target_phy_disk
target_phy_id
use_efi
encryption_style
hibernation
readin bootloader
user
lang
hostname
base
profile
readin network
readin printing
do_partition
do_install
do_chroot
ready