default: recent 

recent: select-download-recent convert refile
  @tree M4B/

full: select-download-full convert refile
  @tree M4B/

doctor: # Check all required executables are found
  @echo "Verify required executables are on the path:"
  just _doc_require_exec_all audible just fzf jq ffmpeg refile-m4b

_doc_require_exec_all *exec:
  for one in {{ exec }} ; do just _doc_require_exec ${one} ; done

_doc_require_exec exec:
  #!/usr/bin/env bash
  export EXEC=$(which {{ exec }})
  if test -z ${EXEC} ; then
    echo "- MISSING : {{ exec }}"
  else
    echo "-   OKAY  : {{ exec }} => ${EXEC}"
  fi

select-download-recent: # Select titles from those added in the latest library, and download them
  just select-download library-recent.txt

select-download-full: # Select titles from the full latest library, and download them
  just select-download $(just latest-library)
  
select-download library: # Select titles from the {{ library }}, and download them
  #!/usr/bin/env bash
  SELECTION=$(cat {{library}} | sort -k 2 | fzf --exact --multi --cycle --scroll-off=3 --reverse)
  ASINS=""
  while IFS= read  -r LINE ; do
    echo "$LINE"
    export ASIN=$(echo $LINE | cut -d: -f 1)
    echo "ASIN: $ASIN"
    ASINS="${ASINS} --asin ${ASIN}"
  done <<< $SELECTION
  just _download-asin $ASINS

fetch-library: # Download the latest version of the Library
  #!/usr/bin/env bash
  set -e
  PREVIOUS=$(just latest-library)
  audible library list | sort > library-$(date +%Y-%m-%d).txt
  CURRENT=$(just latest-library)
  comm -23 $CURRENT $PREVIOUS > library-recent.txt
  echo "New additions:"
  cat library-recent.txt

@latest-library:
  ls library-*.txt | grep -v recent | tail -n 1

_require_dir *dirs:
  mkdir {{ dirs }} 2>/dev/null || true

_move target *files:
  mv {{ files }} {{ target }} 2>/dev/null || true 

_download-asin *asins:
  just _require_dir TEMP
  cd TEMP && audible download --aax-fallback {{ asins }}
  just post-download

post-download: # Move successfully downloaded aax, aaxc and voucher sinto AAX or AAXC
  just _require_dir AAX AAXC
  just _move AAX/ TEMP/*.aax
  just _move AAXC/ TEMP/*.aaxc TEMP/*.voucher

convert: convert-aax convert-aaxc

convert-aax: # Convert all the AAX files to M4B
  #!/usr/bin/env bash
  just _require_dir M4B
  if [ $(fd . AAX | wc -l) -gt 0 ]
  then
    for F in AAX/*.aax
    do
      O=M4B/$(basename $F .aax).m4b
      ffmpeg \
        -y \
        -activation_bytes $(jq .activation_bytes ~/.audible/audible.json | tr '\"' ' ') \
        -i $F \
        -codec copy \
        $O
      rm $F
    done
  else
    echo No AAX to convert
  fi

convert-aaxc: # Convert all the AAXC files to M4B
  #!/usr/bin/env bash
  just _require_dir M4B
  if [ $(fd . AAXC | wc -l) -gt 0 ]
  then
    for AAXC in AAXC/*.aaxc
    do
      VOUCHER="${AAXC%.aaxc}.voucher"
      M4B="M4B/$(basename ${AAXC%.aaxc}).m4b"
      just _convert-one-aaxc $AAXC $VOUCHER $M4B
    done
  else
    echo No AAXC to convert
  fi

_convert-one-aaxc aaxc_file voucher_file m4b_file:
  #!/usr/bin/env bash
  export KEY="$(jq .content_license.license_response.key {{ voucher_file }} | tr '\"' ' ')"
  export  IV="$(jq .content_license.license_response.iv  {{ voucher_file }} | tr '\"' ' ')"
  ffmpeg \
    -audible_key $KEY \
    -audible_iv $IV \
    -i {{ aaxc_file }} \
    -vn \
    -c:a copy \
    -map_metadata 0:g \
    {{ m4b_file }} && \
  rm {{ aaxc_file }} {{ voucher_file }}

refile: # Rename and move files in M4B based on their metadata
  refile-m4b M4B

archive: # Move the contents of M4B to the archive
  #!/usr/bin/env bash
  if [ -d M4B ] && [ -n "${AUDIOBOOK_ARCHIVE}" ] && [ -d "${AUDIOBOOK_ARCHIVE}" ];
  then
    if [ $(fd . M4B | wc -l) -eq 0 ]
    then
      echo "WARN: Nothing to be archived"
      exit 1
    fi
    cd M4B && cp -v -R * "${AUDIOBOOK_ARCHIVE}" 
    just _clean M4B
  else
    echo "ERROR: No archive specified or no M4B directory"
    exit 1
  fi

clean: # Delete the directories TEMP, AAX, AAXC and M4B, including all files within
  for target in TEMP AAX AAXC M4B ; do just _clean $target ; done

_clean target:
  if [ -f {{ target }} -o -d {{ target }} ] ; then rm -r {{ target }} ; fi