#!/bin/sh

# requires: xrandr, awk

err() {
    printf "%s\n" "$*" >&2
    exit 1
}

for cmd in xrandr awk; do
    command -v "$cmd" >/dev/null 2>&1 || err "required command not found: $cmd"
done

# collect all connected outputs
outputs=$(xrandr --query | awk '/ connected/ { print $1 }')

[ -n "$outputs" ] || err "no connected outputs found."

# sample TearFree state from the first connected output
first_output=$(printf '%s\n' "$outputs" | awk 'NR==1')
current_state=$(xrandr --props | awk -v out="$first_output" '
    $1 == out { found=1 }
    found && /TearFree:/ { print $2; exit }
')

case "$current_state" in
    on)  new_state="off" ;;
    *)   new_state="on"  ;;
esac

# single xrandr invocation, avoids monitor reconfiguration for the most part
xrandr_args=""
for output in $outputs; do
    xrandr_args="$xrandr_args --output $output --set TearFree $new_state"
done

# shellcheck disable=SC2086
xrandr $xrandr_args || err "failed to set TearFree $new_state on all outputs"

notify-send "AMDGPU (X11)" "TearFree $new_state" -t 3072 \
    || printf "TearFree toggled to '%s' on all connected outputs.\n" "$new_state"