#!/bin/zsh

DEST="$1"
shift

if [[ -z $DEST ]]
then
  print "NO DEST"
  exit 1
fi

for sourcefile in */*
do
  destfile="$DEST/${sourcefile:r}.mkv"
  print "DESTINATION:: $destfile"
  [[ -e $destfile ]] && continue
  [[ ! -e ${destfile:h} ]] && mkdir -vp ${destfile:h}
  probe=$(ffprobe $sourcefile 2>&1)
  if print -r $probe | grep -q -i vp9
  then
    print "VP9 DETECTED ($sourcefile)"
    typeset videogeo=$(print -r $probe | grep -i vp9 | grep -o '[0-9][0-9]*x[0-9][0-9]*')
    print "VIDEO GEO $videogeo"
    typeset original_x=${videogeo%%x*}
    typeset original_y=${videogeo##*x}
    print "ORIGINAL GEO $original_x / $original_y"
    if (( original_x <= 1920 || original_y <= 1080 ))
    then
      print "UNDER FHD, COPYTING."
      cp -n -v $sourcefile ${destfile:h}/
    fi
    (( ratio_x = $original_x / 1920.0 ))
    (( ratio_y = $original_y / 1080.0 ))
    print "RATIO $ratio_x / $ratio_y"
    if (( ratio_x < ratio_y ))
    then
      print "1920x*"
      ffmpeg -i $sourcefile -c:v libx265 -crf 23 -vf scale=1920:-1 -c:a copy $destfile
    else
      print "*x1080"
      ffmpeg -i $sourcefile -c:v libx265 -crf 23 -vf scale=-1:1080 -c:a copy $destfile
    fi
  else
    print "NOT VP9, COPYING ($sourcefile)"
    cp -n -v $sourcefile ${destfile:h}/
  fi
done