#!/usr/bin/env bash

# Author : Pavan Jadhaw
# Github Profile : https://github.com/pavanjadhaw
# Project Repository : https://github.com/pavanjadhaw/betterlockscreen

init_config () {

    # user configuration file
    USER_CONF="$HOME/.config/betterlockscreenrc"
    if [ -e $USER_CONF ]; then
        source "$USER_CONF"
    # default configuration options
    else
		insidecolor=00000000
		ringcolor=ffffffff
		keyhlcolor=d23c3dff
		bshlcolor=d23c3dff
		separatorcolor=00000000
		insidevercolor=00000000
		insidewrongcolor=d23c3dff
		ringvercolor=ffffffff
		ringwrongcolor=ffffffff
		verifcolor=ffffffff
		timecolor=ffffffff
		datecolor=ffffffff
		loginbox=00000066
		locktext='Type password to unlock...'
		font="sans-serif"
		display_on=0
		span_image=false
	fi

	CACHE_DIR="$HOME/.cache/i3lock"
	CUR_DIR="$CACHE_DIR/current"

	# wallpaper
	CUR_W_RESIZE="$CUR_DIR/wall_resize.png"
	CUR_W_DIM="$CUR_DIR/wall_dim.png"
	CUR_W_BLUR="$CUR_DIR/wall_blur.png"
	CUR_W_DIMBLUR="$CUR_DIR/wall_dimblur.png"

	# locker
	CUR_L_RESIZE="$CUR_DIR/lock_resize.png"
	CUR_L_DIM="$CUR_DIR/lock_dim.png"
	CUR_L_BLUR="$CUR_DIR/lock_blur.png"
	CUR_L_DIMBLUR="$CUR_DIR/lock_dimblur.png"

}
init_config



prelock() {
	if [ ! -z "$(pidof dunst)" ]; then
		pkill -u "$USER" -USR1 dunst
	fi
}


lock() {
	#$1 image path

	i3lock \
		-i "$1" \
        --screen "$display_on" \
		--timepos='x+110:h-70' \
		--datepos='x+43:h-45' \
		--clock --date-align 1 --datestr "$locktext" \
		--insidecolor=$insidecolor --ringcolor=$ringcolor --line-uses-inside \
		--keyhlcolor=$keyhlcolor --bshlcolor=$bshlcolor --separatorcolor=$separatorcolor \
		--insidevercolor=$insidevercolor --insidewrongcolor=$insidewrongcolor \
		--ringvercolor=$ringvercolor --ringwrongcolor=$ringwrongcolor --indpos='x+280:h-70' \
		--radius=20 --ring-width=4 --veriftext='' --wrongtext='' \
		--verifcolor="$verifcolor" --timecolor="$timecolor" --datecolor="$datecolor" \
		--time-font="$font" --date-font="$font" --layout-font="$font" --verif-font="$font" --wrong-font="$font" \
		--noinputtext='' --force-clock $lockargs
}


postlock() {
	if [ ! -z "$(pidof dunst)" ] ; then
		pkill -u "$USER" -USR2 dunst
	fi
}


lockselect() {
	prelock
	case "$1" in
		dim)
			# lockscreen with dimmed background
			lock "$CUR_L_DIM"
			;;

		blur)
			# set lockscreen with blurred background
			lock "$CUR_L_BLUR"
			;;

		dimblur)
			# set lockscreen with dimmed + blurred background
			lock "$CUR_L_DIMBLUR"
			;;

		*)
			# default lockscreen
			lock "$CUR_L_RESIZE"
			;;
	esac
	postlock
}

logical_px() {
	# get dpi value from xrdb
	local DPI=$(xrdb -query | awk '/Xft.dpi/ {print $2}')
	
	# return the default value if no DPI is set
	if [ -z "$DPI" ]; then
		echo $1
	else
		local SCALE=$(echo "scale=2; $DPI / 96.0" | bc)

		# check if scaling the value is worthy
		if [ $(echo "$SCALE > 1.25" | bc -l) -eq 0 ]; then
			echo $1
		else
			echo "$SCALE * $1 / 1" | bc
		fi
	fi
}

# get total resolution
# 1600x900
get_total_size () {
    TOTAL_SIZE=$(xdpyinfo | grep -w "dimensions" | sed -r 's/^[^0-9]*([0-9]+x[0-9]+).*$/\1/')
}


get_display_list () {
    local DNUM=0
    mapfile -t DARR < <( xrandr --listactivemonitors )
    for DISP in "${DARR[@]:1}"; do
        (( DNUM++ ))
        DISP=$(echo $DISP | sed -r 's/\/[0-9]*//g')
        IFS=' ' read -r -a LINE <<< "$DISP"
        DLIST+=("$DNUM ${LINE[3]} ${LINE[2]}")
    done
}


get_user_wall() {
	local path="$1"
	if [ ! -d "$path" ]; then
		USER_WALL="$path"
		return
	fi
	dir=("$path"/*)
	dir="${dir[RANDOM % ${#dir[@]}]}"
    get_user_wall "$dir"
}

resize_and_render () {

    # arguments
    local base=$1
    local path=$2
    local resolution=$3

    # wallpaper
    RES_RESIZE="$2/resize.png"
		RES_DIM="$2/dim.png"
		RES_BLUR="$2/blur.png"
		RES_DIMBLUR="$2/dimblur.png"

    # defaults
		[[ $blur_level ]] || blur_level=1

    echo "Resizing original and applying effects..."

    # apply resize
    eval convert "$base" -resize "$resolution""^" -gravity center -extent "$resolution" "$RES_RESIZE"

	# apply dim
	eval convert "$RES_RESIZE" -fill black -colorize 40% "$RES_DIM"

	# apply blur
	blur_shrink=$(echo "scale=2; 20 / $blur_level" | bc)
	blur_sigma=$(echo "scale=2; 0.6 * $blur_level" | bc)
	eval convert "$RES_RESIZE" \
		-filter Gaussian \
		-resize "$blur_shrink%" \
		-define "filter:sigma=$blur_sigma" \
		-resize "$resolution^" -gravity center -extent "$resolution" \
		"$RES_BLUR"

	# apply dimblur
	eval convert "$RES_DIM" \
		-filter Gaussian \
		-resize "$blur_shrink%" \
		-define "filter:sigma=$blur_sigma" \
		-resize "$resolution^" -gravity center -extent "$resolution" \
		"$RES_DIMBLUR"

}

# delete and recreate directory
purge_cache () {
    if [[ -d "$1" ]]; then
        rm -r "$1"
    fi
    mkdir -p "$1" 
}

# update locker and wallpaper images
update () {

    wallpaper=$1
	rectangles=" "

    get_user_wall "$wallpaper" # Returns USER_WALL
    echo "Original: $USER_WALL"

    get_display_list # Returns DLIST
    get_total_size # Return TOTAL_SIZE

    # create base images per display
    for DISP in "${DLIST[@]}"; do
        DNUM="$(cut -d" " -f1 <<<"${DISP}")"
        DDEV="$(cut -d" " -f2 <<<"${DISP}")"
        DGEO=($(cut -d" " -f3 <<<"${DISP}"))
        DRES=(${DGEO[0]//[+]/ })
        DPOS="+${DRES[1]}+${DRES[2]}"
        DPATH="$CACHE_DIR/$DNUM-$DDEV"

        #get_geometry $DGEO # Returns SCREEN_*
        if [[ $DNUM -eq "$display_on" ]] || [[ "$display_on" -eq 0 ]]; then
            SRA=(${DGEO//[x+]/ })
            CX=$((${SRA[2]} + $(logical_px 25)))
            CY=$((${SRA[1]} - $(logical_px 30)))
            rectangles+="rectangle $CX,$CY $((CX+$(logical_px 300))),$((CY-$(logical_px 80))) "
        fi

        echo "Found: $DDEV ($DNUM)"
        echo "Resolution: ${DRES[0]}"

        purge_cache $DPATH

        # we only need one set of images when spanning
        if [ "$span_image" = true ] && [ $DNUM -gt 1 ]; then
            continue
        fi

        if [ "$span_image" = true ]; then
            # render wallpaper at total display size (3840x1080)
            resize_and_render $USER_WALL $DPATH $TOTAL_SIZE
        else
            # render wallpaper at each display size
            resize_and_render $USER_WALL $DPATH ${DRES[0]}
            # add to parameters for position on canvas
            PARAM_RESIZE="$PARAM_RESIZE $RES_RESIZE -geometry $DPOS -composite "
            PARAM_DIM="$PARAM_DIM $RES_DIM -geometry $DPOS -composite "
            PARAM_BLUR="$PARAM_BLUR $RES_BLUR -geometry $DPOS -composite "
            PARAM_DIMBLUR="$PARAM_DIMBLUR $RES_DIMBLUR -geometry $DPOS -composite "
        fi

    done

    purge_cache $CUR_DIR

    if [ "$span_image" = true ] || [ ${#DLIST[@]} -lt 2 ]; then
        echo "Copying final wallpaper images..."
        cp $RES_RESIZE $CUR_W_RESIZE
        cp $RES_DIM $CUR_W_DIM
        cp $RES_BLUR $CUR_W_BLUR
        cp $RES_DIMBLUR $CUR_W_DIMBLUR
    else
        echo "Creating canvas: $TOTAL_SIZE"
        convert -size $TOTAL_SIZE 'xc:black' $CUR_W_RESIZE 
        convert -size $TOTAL_SIZE 'xc:black' $CUR_W_DIM 
        convert -size $TOTAL_SIZE 'xc:black' $CUR_W_BLUR 
        convert -size $TOTAL_SIZE 'xc:black' $CUR_W_DIMBLUR 

        echo "Rendering final wallpaper images..."
        convert $CUR_W_RESIZE $PARAM_RESIZE $CUR_W_RESIZE
        convert $CUR_W_DIM $PARAM_DIM $CUR_W_DIM
        convert $CUR_W_BLUR $PARAM_BLUR $CUR_W_BLUR
        convert $CUR_W_DIMBLUR $PARAM_DIMBLUR $CUR_W_DIMBLUR
    fi

    echo "Rendering final locker images..."
	convert "$CUR_W_RESIZE" -draw "fill #$loginbox $rectangles" "$CUR_L_RESIZE"
	convert "$CUR_W_DIM" -draw "fill #$loginbox $rectangles" "$CUR_L_DIM"
	convert "$CUR_W_BLUR" -draw "fill #$loginbox $rectangles" "$CUR_L_BLUR"
	convert "$CUR_W_DIMBLUR" -draw "fill #$loginbox $rectangles" "$CUR_L_DIMBLUR"
}


wallpaper() {
    local fopt
    get_display_list
    if [ "$span_image" = true ] || [[ "${#DLIST[@]}" -gt 1 ]]; then
        fopt="--no-xinerama"
    fi
	case "$1" in
		'')
			# set resized image as wallpaper if no argument is supplied by user
			feh --bg-fill "$fopt" "$CUR_W_RESIZE"
			;;

		dim)
			# set dimmed image as wallpaper
			feh --bg-fill "$fopt" "$CUR_W_DIM"
			;;

		blur)
			# set blurred image as wallpaper
			feh --bg-fill "$fopt" "$CUR_W_BLUR"
			;;

		dimblur)
			# set dimmed + blurred image as wallpaper
			feh --bg-fill "$fopt" "$CUR_W_DIMBLUR"
			;;
	esac
}


empty() {
	if [ -f $CUR_L_RESIZE ]; then
		echo -e "\nSeems you haven't provided any arguments. See below for usage details."
	else
		echo 'Important: Update the image cache (e.g. betterlockscreen -u path/to/image.jpg).'
		echo
		echo '		Image cache must be updated to initially configure or update the wallpaper used.'
	fi

	echo
	echo 'For other sets of options and help, use the help command.'
	echo 'e.g. betterlockscreen -h or betterlockscreen --help'
	echo
	echo 'See: https://github.com/pavanjadhaw/betterlockscreen for additional info...'
	exit 1
}


usage() {
	echo 'Important: Update the image cache (e.g. betterlockscreen -u path/to/image.jpg).'
	echo '	Image cache must be updated to initially configure or update wallpaper used'
	echo
	echo
	echo 'See: https://github.com/pavanjadhaw/betterlockscreen for additional info...'
	echo
	echo
	echo 'Options:'
	echo
	echo '	-h --help'
	echo '		For help (e.g. betterlockscreen -h or betterlockscreen --help).'
	echo
	echo
	echo '	-u --update'
	echo '		to update image cache, you should do this before using any other options'
	echo '		E.g: betterlockscreen -u path/to/image.png when image.png is custom background'
	echo '		Or you can use betterlockscreen -u path/to/imagedir and a random file will be selected.'
	echo
	echo
	echo '	-l --lock'
	echo '		to lock screen (e.g. betterlockscreen -l)'
	echo '		you can also use dimmed or blurred background for lockscreen.'
	echo '		E.g: betterlockscreen -l dim (for dimmed background)'
	echo '		E.g: betterlockscreen -l blur (for blurred background)'
	echo '		E.g: betterlockscreen -l dimblur (for dimmed + blurred background)'
	echo
	echo
	echo '	-s --suspend'
	echo '		to suspend system and lock screen (e.g. betterlockscreen -s)'
	echo '		you can also use dimmed or blurred background for lockscreen.'
	echo '		E.g: betterlockscreen -s dim (for dimmed background)'
	echo '		E.g: betterlockscreen -s blur (for blurred background)'
	echo '		E.g: betterlockscreen -s dimblur (for dimmed + blurred background)'
	echo
	echo
	echo '	-w --wall'
	echo '		you can also set lockscreen background as wallpaper'
	echo '		to set wallpaper (e.g. betterlockscreen -w or betterlockscreen --wall)'
	echo '		you can also use dimmed or blurred variants.'
	echo '		E.g: betterlockscreen -w dim (for dimmed wallpaper)'
	echo '		E.g: betterlockscreen -w blur (for blurred wallpaper)'
	echo '		E.g: betterlockscreen -w dimblur (for dimmed + blurred wallpaper)'
	echo
	echo
	echo '	-d --display'
	echo '		to be used after -u'
	echo '		used to set which screen to display login box.'
	echo '		E.g: betterlockscreen -u path/to/image.png -d 1'
	echo '		E.g: betterlockscreen -u path/to/image.png --display 2'
	echo
	echo
	echo '	--span'
	echo '		to be used after -u'
	echo '		used to create wall and locker images that span multiple displays.'
	echo '		E.g: betterlockscreen -u path/to/image.png --span'
	echo
	echo
	echo '	-b --blur'
	echo '		to be used after -u'
	echo '		used to set blur intensity. Default to 1.'
	echo '		E.g: betterlockscreen -u path/to/image.png -b 3'
	echo '		E.g: betterlockscreen -u path/to/image.png --blur 0.5'
	echo
	echo
	echo '	-t --text'
	echo '		to set custom lockscreen text (max 31 chars)'
	echo "		E.g: betterlockscreen -l dim -t \"Don't touch my machine!\""
	echo '		E.g: betterlockscreen --text "Hi, user!" -s blur'
}


# Options
[[ "$1" = '' ]] && empty

for arg in "$@"; do
	[[ "${arg:0:1}" = '-' ]] || continue

	case "$1" in
		-h | --help)
			usage
			break
			;;

		-s | --suspend)
			runsuspend=true
			;&

		-l | --lock)
			runlock=true
			[[ $runsuspend ]] || lockargs="$lockargs -n"
			[[ ${2:0:1} = '-' ]] && shift 1 || { lockstyle="$2"; shift 2; }
			;;

		-w | --wall | --wallpaper)
			wallpaper "$2"
			shift 2
			;;

		-u | --update)
			runupdate=true
			imagepath="$2"
			shift 2
			;;

		-t | --text)
			locktext="$2"
			shift 2
			;;

		-d | --display)
			display_on="$2"
			shift 2
			;;

		--span)
			span_image=true
            shift 1
			;;

		-b | --blur)
			blur_level="$2"
			shift 2
			;;

		--)
			lockargs="$lockargs ${@:2}"
			break
			;;

		*)
			echo "invalid argument: $1"
			break
			;;
	esac
done

# some defaults
[[ $display_on ]] || display_on=0
[[ $span_image ]] || span_image=false

# Run image generation
[[ $runupdate ]] && update "$imagepath"

# Activate lockscreen
[[ $runlock ]] && lockselect "$lockstyle" && \
	{ [[ $runsuspend ]] && systemctl suspend; }

exit 0