#!/bin/bash

FADE_TIMEOUT=60        # one minute
DIM_TIMEOUT=120        # two minutes
LOCK_TIMEOUT=300       # five minutes
SLEEP_TIMEOUT=600      # ten minutes
HIBERNATE_TIMEOUT=3600 # one hour

BLFILE="$HOME/.local/state/idle.dim"
OPFILE="$HOME/.local/state/active_outputs"
STATEFILE="$HOME/.local/state/idle.state"
IDLEMODE=$(cat $HOME/.local/state/idle_mode)
if [[ -n $2 ]]; then
	if [[ $2 == '--ignore_mode' ]]; then
		IDLEMODE='hibernate'
	else
		echo "Unknown mode $IDLEMODE"
		exit
	fi
fi
if [[ -z $IDLEMODE ]]; then
	IDLEMODE="lock"
fi
if [[ $IDLEMODE == 'none' ]]; then
	IDLEMODE=0
elif [[ $IDLEMODE == 'fade' ]]; then
	IDLEMODE=1
elif [[ $IDLEMODE == 'dim' ]]; then
	IDLEMODE=2
elif [[ $IDLEMODE == 'lock' ]]; then
	IDLEMODE=3
elif [[ $IDLEMODE == 'sleep' ]]; then
	IDLEMODE=4
elif [[ $IDLEMODE == 'hibernate' ]]; then
	IDLEMODE=5
else
	echo "Invalid idle_mode '$IDLEMODE'"
fi

function usage() {
	echo "usage: $0 <option> [--ignore_mode]
    start       - Initialize 'swayidle' script. This should be declared in Sway config
    stop        - Kill 'swayidle' script. Consider idle-inhibitor or sleepmode 'none' instead
    daemon      - Run 'start' as a presistent background process
    mode <mode> - Set the idle_mode: none, fade, dim, lock, sleep, hibernate
    fade        - First idle action. Fades all windows to show background
    unfade      - Restore opacity for faded windows
    dim         - Reduce display brightness to minimum
    undim       - Restore brightness to level prior to 'dim'
    lock        - Mark as inactive and start 'swaylock'
    unlock      - (Run upon unlock) Mark as active again
    sleep       - Disable displays, but continue background processes
    unsleep     - Re-enable displays
    hibernate   - Enter suspend-then-hibernate target
    unhibernate - Clean up after waking from hibernation
    help        - This message

    Idle will result in the following actions in sequence:

    fade        - 1 minute. Fade all windows by reducing opacity to 0 via Sway IPC
    dim         - 2 minutes. Dim the display with \`gammactl\`
    lock        - 5 minutes. Lock the screen with \`swaylock\`
    sleep       - 10 minutes. Sleep by disabling power to all displays via DPMS
    hibernate   - 60 minutes. Hibernate by entering 'suspend-then-hibernate.target'

    Timeouts define statically in the program.

    Idle modes are additive, thus the idle_mode is the final action you would like to run in the 
    sequence. For example: 'sleep' mode will enable 'fade', 'lock', and 'sleep', but not 'hibernate'

    --ignore_mode   - Run <option> even if in a lower mode in the sequence
    "
	exit
}

if [[ -z $1 ]]; then
	echo "Missing argument"
	usage
elif [[ $1 == "-h" ]] || [[ $1 == "--help" ]] || [[ $1 == "help" ]]; then
	usage
elif [[ $1 == "start" ]]; then
	swayidle -w \
		timeout $FADE_TIMEOUT "$0 fade" \
		resume "$0 unfade" \
		timeout $DIM_TIMEOUT "$0 dim" \
		resume "$0 undim" \
		timeout $LOCK_TIMEOUT "$0 lock" \
		resume "$0 unlock" \
		timeout $SLEEP_TIMEOUT "$0 sleep" \
		resume "$0 unsleep" \
		timeout $HIBERNATE_TIMEOUT "$0 hibernate" \
		resume "$0 unhibernate"
	if [[ -e $STATEFILE ]]; then
		rm $STATEFILE
	fi
elif [[ $1 == "daemon" ]]; then
	nohup $0 start 2>/dev/null &
elif [[ $1 == "stop" ]]; then
	pkill swayidle
	if [[ -e $STATEFILE ]]; then
		rm $STATEFILE
	fi
elif [[ $1 == "fade" ]]; then
	if [[ $IDLEMODE -gt 0 ]]; then
		echo 'hide' > $STATEFILE
		if [[ ! -e $HOME/.local/state/sway-hidden ]]; then
			kill -USR2 $(cat $HOME/.local/state/sway-transparency)
			makoctl mode -a hide
		fi
	fi
elif [[ $1 == "unfade" ]]; then
	if [[ -e $HOME/.local/state/sway-hidden ]]; then
		kill -USR2 $(cat $HOME/.local/state/sway-transparency)
		# TODO: This is a hack. There's no reason that waybar should be dead.
		#$HOME/scripts/sway/displays.pl -w
		makoctl mode -r hide
	fi
	if [[ -e $STATEFILE ]]; then
		rm $STATEFILE
	fi
elif [[ $1 == "dim" ]]; then
	if [[ $IDLEMODE -gt 1 ]]; then
		echo 'dim' > $STATEFILE
		# I don't currently have any dimable monitors, so fade was created instead
		echo $($HOME/scripts/thinkpad/blc.pl %) >$BLFILE
		$HOME/scripts/thinkpad/blc.pl = 1 &>-
	fi
elif [[ $1 == "undim" ]]; then
	makoctl set-mode default
	$HOME/scripts/thinkpad/blc.pl = $(cat $BLFILE) &>-
	if [[ -e $STATEFILE ]]; then
		rm $STATEFILE
	fi
elif [[ $1 == "lock" ]]; then
	if [[ $IDLEMODE -gt 2 ]]; then
		echo 'lock' > $STATEFILE
		swaylock -f -c 00000000
	fi
elif [[ $1 == "unlock" ]]; then
	kill -USR1 $(pgrep swaylock)
	if [[ -e $STATEFILE ]]; then
		rm $STATEFILE
	fi
elif [[ $1 == "sleep" ]]; then
	if [[ $IDLEMODE -gt 3 ]]; then
		echo 'sleep' > $STATEFILE
		for i in $(cat $OPFILE); do swaymsg "output $i dpms off"; done
	fi
elif [[ $1 == "unsleep" ]]; then
	for i in $(cat $OPFILE); do swaymsg "output $i dpms on"; done
	#$HOME/scripts/sway/displays.pl
	cd $HOME/scripts/sway
	source $HOME/.dotfiles/bash/plenv-path.sh
	$HOME/scripts/sway/displays.pl 2>&1 >$HOME/.local/state/display_unsleep
	if [[ -e $STATEFILE ]]; then
		rm $STATEFILE
	fi
elif [[ $1 == "hibernate" ]]; then
	if [[ $IDLEMODE -gt 4 ]]; then
		echo 'hibernate' > $STATEFILE
		sudo systemctl suspend-then-hibernate.target
	fi
else
	echo "Invalid argument: $1"
	usage
fi