#!/bin/bash
# I, Ian Kelling, follow the GNU license recommendations at
# https://www.gnu.org/licenses/license-recommendations.en.html. They
# recommend that small programs, < 300 lines, be licensed under the
# Apache License 2.0. This file contains or is part of one or more small
# programs. If a small program grows beyond 300 lines, I plan to change
# to a recommended GPL license.

# Copyright 2024 Ian Kelling

# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at

#     http://www.apache.org/licenses/LICENSE-2.0

# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.



usage() {
  cat <<EOF
Somewhat hacky script to watch whatever screencast I'm creating with ffs.

Usage: ${0##*/} [-d] [sysops|tech|staff]
3 mountpoints: fsf-sysops (default, public), fsf (all staff), fsf-tech (tech team)

-d    debug. start unmuted.

todo: add -n dry run which will for print out suggested commands for viewers

Note: full screen will cause distortion in fonts. I dunno why, seems like ffplay is a bit buggy

note: some args duplicated in ffp



-h|--help  Print help and exit.

Note: Uses util-linux getopt option parsing: spaces between args and
options, short options can be combined, options before args.
EOF
  exit $1
}

##### begin command line parsing ########

# ensure we can handle args with spaces or empty.
ret=0; getopt -T || ret=$?
[[ $ret == 4 ]] || { echo "Install util-linux for enhanced getopt" >&2; exit 1; }

debug=false
volume=0
temp=$(getopt -l help hdw "$@") || usage 1
eval set -- "$temp"
while true; do
  case $1 in
    -d)
      volume=100
      debug=true
      ;;
    -h|--help) usage ;;
    --) shift; break ;;
    *) echo "$0: unexpected args: $*" >&2 ; usage 1 ;;
  esac
  shift
done

mount_suffix=-sysops
case $1 in
  sysops|tech)
    mount_suffix=-$1
    ;;
  staff)
    mount_suffix=
    ;;
esac

##### end command line parsing ########


host=https://live.iankelling.org:443
live_host=$(dig +timeout=1 +short @iankelling.org live.iankelling.org)
vps_host=$(dig +timeout=1 +short iankelling.org)
if [[ $live_host != "$vps_host" ]] &&  ip n show 10.2.0.1 | grep . &>/dev/null && \
     [[ $(dig +timeout=1 +short @10.2.0.1 -x 10.2.0.2 2>&1 ||:) == kd.b8.nz. ]]; then
  host=http://127.0.0.1:8000
fi

url=$host/fsf$mount_suffix.webm

files=(~/2*.webm)
file=${files[@]}
if [[ -e $file ]]; then
  url=$file
fi

opts=(
  -v error
  #-v debug
  -hide_banner
  -nostats
  -volume $volume
  -fast
  -fflags nobuffer
  -flags low_delay
  # makes it a floating window in i3 and avoids scaling
  -noborder
  -f webm
  -i $url
  -autoexit
)
if $debug; then
  echo running: ffplay "${opts[@]}"
fi
ffplay "${opts[@]}"

# # working mpv, but still a second or so slower than ffplay.
# mpv_opts=(
#   # these seem to have no effect on latency
#   #--no-cache
#   #--untimed
#   --no-demuxer-thread
#   --vd-lavc-threads=1
#   --volume=$volume
#   --video-unscaled
#   $host/fsf$mount_suffix.webm
# )

# todo: make more mountpoints for other ppl to stream
# todo: make raw recordings accessible to public, for public streams.
#