#!/bin/bash

main="/tmp/vinstall"
target="${main}/target"
pass="oem"

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

mkdir -p $target

. functions

target_phy_disk() {
	header "Choose target disk"
	local DISKS_DETAILS
	local output
	DISKS_DETAILS=$(lsblk -l -o KNAME,TYPE,SIZE,MODEL,WWN|grep disk)
	echo "$DISKS_DETAILS"
	input "which one?" "$(echo "$DISKS_DETAILS"|awk '{print $1}'|tr '\n' ' ')" "not found."
	TARGET_PHY_DISK="/dev/${output}"
}

target_phy_id() {
	local i
	local f1
	local f2
	for i in $(find /dev/disk/by-id|grep -v part); do
		if realpath "$i" | grep -q -i "$TARGET_PHY_DISK"; then
			if echo "$i" | grep -q "wwn"; then
				TARGET_PHY_WWN="$i"
				f1=1
			fi
			if echo "$i" | grep -q -v "wwn"; then
				TARGET_PHY_ID="$i"
				f2=1
			fi
		fi
	done
	if [ "$f1" == "1" ] && [ "$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() {
	header "Choose encryption style"
	echo "implemented:"
	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
	input "how to encrypt?" "a b c d e" "wrong input"
	ENCRYPTION_STYLE="$output"
}

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 -a optimal $TARGET_PHY_WWN -s -- mklabel gpt
		size=500
		parted -a optimal $TARGET_PHY_WWN unit mib -s -- mkpart EFI fat32 $start $(( start + size ))
		sleep 2
		start=$(( start + size ))
		parted -a optimal $TARGET_PHY_WWN unit mib -s -- mkpart root $start -1s
		mkfs.vfat -F32 ${TARGET_PHY_WWN}-part1
		TARGET_PART="2"
	else
		set -x
		parted -a optimal $TARGET_PHY_WWN -s -- mklabel msdos
		TARGET_PART="1"
		if [ "$ENCRYPTION_STYLE" == "b" ] || [ "$ENCRYPTION_STYLE" == "e" ]; then
			size=2048
			parted -a optimal $TARGET_PHY_WWN unit mib -s -- mkpart primary ext4 $start $(( start + size ))
			sleep 2
			start=$(( start + size ))
			mkfs.btrfs -f "${TARGET_PHY_WWN}-part1"
			TARGET_PART="2"
		fi
		parted -a optimal $TARGET_PHY_WWN unit mib -s -- mkpart primary ext4 $start -1s
	fi
	sleep 2
	TARGETNAME=$(basename ${TARGET_PHY_WWN}-part${TARGET_PART})
	TARGETNAME_UNDERSCORE=${TARGETNAME//-/_}
	echo -n $pass | cryptsetup luksFormat ${TARGET_PHY_WWN}-part${TARGET_PART} -d -
	#echo -n $pass | sudo cryptsetup luksOpen /dev/sdc1 sdc1  -d -
	echo -n $pass | cryptsetup luksOpen ${TARGET_PHY_WWN}-part${TARGET_PART} "luks_${TARGETNAME_UNDERSCORE}" -d -
	vgcreate vg_${TARGETNAME_UNDERSCORE} /dev/mapper/luks_${TARGETNAME_UNDERSCORE}
	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_WWN}-part1 ${target}/boot/efi
	else
		if [ "$ENCRYPTION_STYLE" == "b" ] || [ "$ENCRYPTION_STYLE" == "e" ]; then
			mkdir -p ${target}/boot
			mount ${TARGET_PHY_WWN}-part1 ${target}/boot
		fi
	fi
}

target_phy_disk
target_phy_id
use_efi
encryption_style
hibernation





do_partition