#!/bin/sh
#
# SPDX-License-Identifier: AGPL-3.0-or-later
#
# PASST - Plug A Simple Socket Transport
#  for qemu/UNIX domain socket mode
#
# PASTA - Pack A Subtle Tap Abstraction
#  for network namespace/tap device mode
#
# test/lib/video - Video grabbing, JavaScript fragments with links
#
# Copyright (c) 2021 Red Hat GmbH
# Author: Stefano Brivio <sbrivio@redhat.com>

FFMPEG_PID_FILE="$(mktemp)"
VIDEO_START_SECONDS=
VIDEO_NAME=

VIDEO_LINKS_TEMPLATE="document.write('"'
	Skip to:
'

VIDEO_LINKS_TEMPLATE_JS="
');

var video___VIDEO_NAME__links = [
"

VIDEO_LINKS_TEMPLATE_POST='];

for (var i = 0; i < video___VIDEO_NAME__links.length; i++) {
	var obj = document.getElementById(video___VIDEO_NAME__links[i][0]);

	obj.addEventListener("click", function(event) {
		var __VIDEO_NAME___video = document.getElementById("__VIDEO_NAME___video");
		var top = __VIDEO_NAME___video.offsetTop - 5;

		event.preventDefault();
		__VIDEO_NAME___video.play();
		__VIDEO_NAME___video.pause();
		for (var i = 0; i < video___VIDEO_NAME__links.length; i++) {
			if (this.id == video___VIDEO_NAME__links[i][0]) {
				__VIDEO_NAME___video.currentTime = video___VIDEO_NAME__links[i][1];
			}
		}
		window.scrollTo({ top: top, behavior: "smooth" })
		__VIDEO_NAME___video.play();
	}, false);
}
'

VIDEO_LINKS_BUF=
VIDEO_LINKS_COUNT=0

# video_append_links() - Append generic string to JavaScript links file
video_append_links()
{
	printf "${@}" >> "${BASEPATH}/${VIDEO_NAME}.js"
}

# video_append_links() - Append generic string to buffer for links
video_append_links_js()
{
	VIDEO_LINKS_BUF="${VIDEO_LINKS_BUF}${@}"
}

# video_grab() - Fetch window geometry, start grabbing video
video_grab() {
	VIDEO_NAME="${1}"

	rm -f "${BASEPATH}/${VIDEO_NAME}.mp4" "${BASEPATH}/${VIDEO_NAME}.webm" "${BASEPATH}/${VIDEO_NAME}.js"

	echo "${VIDEO_LINKS_TEMPLATE}" > "${BASEPATH}/${VIDEO_NAME}.js"

	if [ ${XVFB} -eq 1 ]; then
		# Grab the geometry of the first window that's at least 100px wide
		eval $(xwininfo -d :99.0 -root -tree | sed -n 's/^[ ]*0x[0-f]*[^0-9]*\([0-9]\{3,\}\)x\([0-9]*\)+\([0-9]*\)+\([0-9]*\).*/__width=\1; __height=\2; __x=\3; __y=\4;/p')
	else
		__x=$(xwininfo -id $(xdotool getactivewindow) | sed -n 's/[ ]*Absolute upper-left X:[ ]*\([0-9]*\)$/\1/p')
		__y=$(xwininfo -id $(xdotool getactivewindow) | sed -n 's/[ ]*Absolute upper-left Y:[ ]*\([0-9]*\)$/\1/p')
		__width=$(xwininfo -id $(xdotool getactivewindow) | sed -n 's/[ ]*Width:[ ]*\([0-9]*\)$/\1/p')
		__height=$(xwininfo -id $(xdotool getactivewindow) | sed -n 's/[ ]*Height:[ ]*\([0-9]*\)$/\1/p')
	fi

	[ $((__width % 2)) ]  && __width=$((__width - 1))
	[ $((__height % 2)) ] && __height=$((__height - 1))

	sleep 3
	VIDEO_START_SECONDS=$(sed -n 's/\([0-9]*\).[0-9]* [0-9]*.[0-9]*/\1/p' /proc/uptime)
	[ ${XVFB} -eq 1 ] && __disp=":99.0" || __disp=
	ffmpeg -f x11grab -framerate 15 -video_size "${__width}x${__height}" -i "${__disp}+${__x},${__y}" -vcodec libx264 -preset ultrafast -qp 0 -pix_fmt yuv444p -draw_mouse 0 "${BASEPATH}/${VIDEO_NAME}.mp4" & echo $! > "${FFMPEG_PID_FILE}"
}

# video_time_now() - Print current video timestamp, in seconds
video_time_now() {
	__now=$(sed -n 's/\([0-9]*\).[0-9]* [0-9]*.[0-9]*/\1/p' /proc/uptime)
	echo $((__now - VIDEO_START_SECONDS))
}

# video_stop() - Stop grabbing, finalise JavaScript templates, convert to webm
video_stop() {
	sed -i 's/^.*$/&\\/g' "${BASEPATH}/${VIDEO_NAME}.js"
	echo "${VIDEO_LINKS_TEMPLATE_JS}" | sed "s/__VIDEO_NAME__/${VIDEO_NAME}/g" >> "${BASEPATH}/${VIDEO_NAME}.js"
	echo "${VIDEO_LINKS_BUF}" >> "${BASEPATH}/${VIDEO_NAME}.js"
	echo "${VIDEO_LINKS_TEMPLATE_POST}"  | sed "s/__VIDEO_NAME__/${VIDEO_NAME}/g" >> "${BASEPATH}/${VIDEO_NAME}.js"

	kill -INT $(cat "${FFMPEG_PID_FILE}")
	while ps -p $(cat "${FFMPEG_PID_FILE}") >/dev/null; do sleep 1; done
	rm "${FFMPEG_PID_FILE}"

	[ ${1} -ne 0 ] && return

	ffmpeg -an -fflags +genpts -i "${BASEPATH}/${VIDEO_NAME}.mp4" -c:v libvpx-vp9 -row-mt 1 -minrate 10k -maxrate 200k -b:v 200k "${BASEPATH}/${VIDEO_NAME}.webm"
}

# video_link() - Append single link to given video chapter
video_link() {
	[ ${VIDEO_LINKS_COUNT} -eq 0 ] && __sep="" || __sep=" |"
	__id="video_link_${VIDEO_LINKS_COUNT}"
	video_append_links "${__sep} <a id=\"${__id}\">${1}</a>"
	video_append_links_js "[ '${__id}', $(($(video_time_now) - 1)) ],"

	VIDEO_LINKS_COUNT=$((VIDEO_LINKS_COUNT + 1))
}