#!/bin/bash
set -e
[ -n "$DEBUG" ] && set -x

# check requirements
for app in swww wlr-randr; do
	if ! command -v "$app" >/dev/null; then
		printf "%s: %s not installed but required\n" "$(basename "$0")" "$app" >&2
		exit 1
	fi
done

if ! pgrep swww-daemon >/dev/null 2>&1; then
	printf "%s: swww-daemon not running, aborting\n" "$(basename "$0")" >&2
	exit 1
fi

change_bg() {
	local OUTPUT=$1

	export SWWW_TRANSITION=none SWWW_TRANSITION_FPS=60
	if [ ${#BGS} -gt 0 ]; then
		idx=$((0 + RANDOM % ${#BGS[@]}))
		swww img \
			--outputs "${OUTPUT}" \
			"${BGS[${idx}]}"
	else
		swww img \
			--outputs "${OUTPUT}" \
			"$(grep image "${XDG_CONFIG_HOME}"/oguri/config | cut -d= -f2)"
	fi
}

logger 'oguri-cycle: changing background(s)' || true

BGS_DIR=$HOME/pictures/wallp

readarray -t OUTPUTS < <(wlr-randr --json | jq -r '..|select(.transform?=="normal")|.name')
# readarray -t OUTPUTS < <(wlr-randr | awk 'BEGIN{name=""} /^\S/{name=$1} /Transform: normal/{print name}')
readarray -d '' BGS < <(find "${BGS_DIR}"/horizontal/ -print0 2>/dev/null)
readarray -d '' BGS < <(find "${BGS_DIR}"/landscape/ -print0 2>/dev/null)

for o in "${OUTPUTS[@]}"; do change_bg "$o"; done

readarray -t OUTPUTS < <(wlr-randr --json | jq -r '..|select((.transform?=="270")or(.transform?=="90"))|.name')
# readarray -t OUTPUTS < <(wlr-randr | awk 'BEGIN{name=""} /^\S/{name=$1} /Transform: 90/{print name}')
readarray -d '' BGS < <(find "${BGS_DIR}"/vertical/ -print0 2>/dev/null)
readarray -d '' BGS < <(find "${BGS_DIR}"/portrait/ -print0 2>/dev/null)

for o in "${OUTPUTS[@]}"; do change_bg "$o"; done