_usage:
	just -l

_get_nix_path versionsPath:
	echo $(set -x; nix-build --no-link --show-trace {{invocation_directory()}}/nix/default.nix -A channelSources --argstr versionsPath  {{versionsPath}} --argstr rebuildarg "dummy")

_device recipe dir +moreargs="":
	#!/usr/bin/env bash
	set -ex
	source $(just -v _get_nix_path {{invocation_directory()}}/{{dir}}/versions.nix)
	$(set -x; nix-build --no-link --show-trace $(dirname {{dir}})/default.nix -A recipes.{{recipe}} --argstr dir {{dir}} {{moreargs}})

_render_templates:
	#!/usr/bin/env bash
	set -ex
	source $(just -v _get_nix_path {{invocation_directory()}}/nix/variables/versions.nix)
	nix/scripts/pre-eval-fixed.sh nix/home-manager/profiles/dotfiles/vcsh{.tmpl,}.nix

_rebuild-device dir rebuildarg="dry-activate" +moreargs="": _render_templates
	#!/usr/bin/env bash
	set -ex
	just -v _device rebuild {{dir}} --argstr rebuildarg {{rebuildarg}} {{moreargs}}

rebuild-remote-device dir target rebuildarg="dry-activate" :
	#!/usr/bin/env bash
	set -ex
	just -v _rebuild-device {{dir}} {{rebuildarg}} --argstr moreargs "'--target-host\ {{target}}'"

# Rebulid this device's NixOS
rebuild-this-device rebuildarg="dry-activate":
	#!/usr/bin/env bash
	set -e

	function parse_hm_rebuildarg() {
		case $1 in
			switch)
				echo switch
				;;
			*)
				echo build
				;;
		esac
	}

	export SYSREBUILD_LOG=.$(hostname -s)_sysrebuild.log
	export HOMEREBUILD_LOG=.$(hostname -s)_homerebuild.log

	echo Rebuilding system in {{rebuildarg}}-mode...
	if just -v _rebuild-device nix/os/devices/$(hostname -s) {{rebuildarg}} > ${SYSREBUILD_LOG} 2>&1 ; then
		echo System rebuild successful
	else
		cat ${SYSREBUILD_LOG}
		echo System rebuild failed
	fi

	if type home-manager > /dev/null 2>&1; then
		echo Rebuilding home in $(parse_hm_rebuildarg {{rebuildarg}})-mode...
		if home-manager -v $(parse_hm_rebuildarg {{rebuildarg}}) > ${HOMEREBUILD_LOG} 2>&1 ; then
			echo Home rebuild successful
		else
			cat ${HOMEREBUILD_LOG}
			echo Home rebuild failed
		fi
	fi

# This could be used to inject another channel
# --argstr moreargs "\'-I nixos-unstable=https://nixos.org/channels/nixos-unstable/nixexprs.tar.xz\'"


# Update nix-channels and switch to updated NixOS and home environments
update-this-device:
	#!/usr/bin/env bash
	set -e
	export SYSREBUILD_LOG=.$(hostname -s)_sysrebuild.log

	echo Updating system channels...
	sudo nix-channel --update
	just -v rebuild-this-device switch

# Iterate on a qtile config by running it inside Xephyr. (un-/grab the mouse with Ctrl + Shift-L)
hm-iterate-qtile:
	#!/usr/bin/env bash
	set -xe
	home-manager switch || just -v rebuild-this-device switch
	Xephyr -ac -br -resizeable :1 &
	XEPHYR_PID=$!
	echo ${XEPHYR_PID}
	DISPLAY=:1 $(grep qtile ~/.xsession) &
	wait $!
	kill ${XEPHYR_PID}

# !!! DANGERIOUS !!! This wipes the disk which is configured for the given device.
disk-prepare dir:
	just -v _device diskPrepare {{dir}} --argstr rebuildarg "dummy"

# Mount the target disk specified by device configuration directory. The 'dir' argument points to a device configuration, e.g. 'nix/os/devices/steveej-live-mmc-SL32G_0x259093f6'
disk-mount dir:
	just -v _device diskMount {{dir}} --argstr rebuildarg "dummy"

# Unmount target disk, specified by device configuration directory
disk-umount dir:
	just -v _device diskUmount {{dir}} --argstr rebuildarg "dummy"

# Perform an offline installation on the mounted target disk, specified by device configuration directory
disk-install dir: _render_templates
	just -v _device diskInstall {{dir}} --argstr rebuildarg "dummy"

verify-vnc sshserver attempts="10":
	#!/usr/bin/env bash
	set -e
	: ${VNCSOCK:?VNCSOCK must be set}
	: ${VNCPW:?VNCPW must be set}

	export MAGICK_ARGS="-filter Catrom -density 72 -resample 300 -contrast -normalize -despeckle -type grayscale -sharpen 1 -posterize 3 -negate -gamma 100 -blur 1x65535"
	export TESS_ARGS="-c debug_file=/dev/null --psm 4"

	function send() {
		local what="${1:?need something to send}"
		ssh -4 ${SSHOPTS:?need sshopts} root@{{sshserver}} "echo -e ${what}>> /dev/tty0" &>/dev/null
	}

	function expect() {
		local what="${1:?need something to expect}"
		vncdo --server=${VNCSOCK} --password=${VNCPW} --disable-desktop-resizing --nocursor capture $PWD/screenshot.bmp
		convert ${MAGICK_ARGS} screenshot.bmp screenshot.tiff
		tesseract ${TESS_ARGS} screenshot.tiff screenshot
		grep --quiet "${what}" screenshot.txt
	}

	function send_and_expect() {
		local send="${1:?need something to send}"
		local expect="${2:?need something to expect}"
		if ! send "${send}"; then
			echo warning: cannot send > /dev/stderr
			return -1
		fi
		expect "${expect}"
	}

	trap 'E=$?; set +e; rm screenshot.*; echo Exiting...; kill $(jobs -p | cut -d " " -f 4); exit $E' EXIT

	for i in `seq 1 {{attempts}}`; do
		echo Attempt $i...
		expect="$(pwgen -0 12)"
		send="'\0033\0143'${expect}"
		if send_and_expect "${send}" "${expect}"; then
			pipe=$(mktemp -u)
			mkfifo ${pipe}
			exec 3<>${pipe}
			rm ${pipe}

			echo Verification succeeded at attempt $i. Unlocking remote drive...
			ssh -4 ${SSHOPTS} root@{{sshserver}} "cryptsetup-askpass" <&3 &>/dev/null &
			eval ${GETPW} | head -n1 >&3

			for j in `seq 1 120`; do
				sleep 0.5
				if expect '— success'; then
					echo Unlock successful.
					exit 0
				fi
			done

			echo Unlock failed...
			exit 1
		fi
	done
	echo Verification failed {{attempts}} times. Giving up...
	exit 1

_get_pass_entry path key:
	pass show {{path}}| grep -E "^{{key}}:" | awk '{ print $2 }'
	# jq -sR 'split("\n") | map(split(":"))' <(pass show Infrastructure/VPS/CFB4ED74 | grep -E "^[A-Za-z_]+:")