#!/bin/sh
set -eu

cd "${LIVEDIR:-$HOME/Public/live/}"

makefile_pre() {
	cat <<'EOF'
.POSIX:
FFMFLAGS = -hide_banner -loglevel info



.SUFFIXES:
.SUFFIXES: .mpd .webmx

.mpd.webmx:
	cd $(?D) && ffmpeg $(FFMFLAGS) -i $(<F) $(*F).webm
	touch $@


all:
EOF
}

makefile_post() {
	cat <<'EOF'

sources.webmx = $(sources.mpd:.mpd=.webmx)

all: $(sources.webmx) $(combined.webmx)

$(combined.webmx):
	ffmpeg $(FFMFLAGS) `printf ' -i %s' $?` $*.webm
	ln $*.webm queue/$(*D).webm
	touch $@
EOF
}

mkdeps() {
	find data/*/*/live.mpd | varlist 'sources.mpd'
	find data/*/*/live.mpd | cut -d/ -f1 | sed 's|$|/combined.webmx|' |
		LANG=POSIX.UTF-8 sort | uniq | varlist 'combined.webmx'
	printf '\n'

	find data/*/*/live.mpd | sed 's/^\(.*\)\.mpd$/\1.webmx: \1.mpd/'
	find data/*/*/live.mpd | sed 's/^\(.*\)\.mpd$/\1.webm: \1.webmx/'
	printf '\n'

	find data/*/*/live.mpd | sed 's/\.mpd$/.webm/' | LANG=POSIX.UTF-8 sort |
		awk -F/ '{ printf "%s/combined.webmx:\t%s\n", $1, $0 }'
}


{
	makefile_pre
	mkdeps
	makefile_post
} | make -f-