#! /bin/bash
# Last edited on 2003-07-20 20:42:20 by stolfi

usage="${0##*/} [-rm] BATCHDIR DISKDIR  [ RAWNAME NEWNAME DISP COMMENT ] ... eob"

# Create symbolic links {DISP}/{BATCHDIR}/{NEWNAME}.jpg
# to the raw Mavica CD-300
# images RAW/{DISKDIR}/{RAWNAME}.JPG. Also creates symlinks to
# the small
# ("{NEWNAME}-s.JPG"), enhanced ("{NEWNAME}-s.JPG"), and iconic
# ("{NEWNAME}-i.JPG") versions of those images.
# 
# If "-rm" is given, the links are removed instead.
# 
# The directory {DISP}/{BATCHDIR} is created if necessary.
# The {COMMENT} is a string and is ignored for now.

remove=0;
while ( [ $# -gt 0 ] && [ "/${1:0:1}" == "/-" ] ); do
  if [ "$1" == "-rm" ]; then
    remove=1; shift;
  else
    echo "usage: ${usage}"; exit 1;
  fi
done

if [ $# -lt 3 ]; then echo "usage: ${usage}"; exit 1; fi

bat="$1"; shift;
dsk="$1"; shift;

disps=( ETC PRE TEC PUB )

pwd
echo "copying RAW/${dsk} -> {${disps[@]}}/${bat}"

# Ensure that directories exist:
if [ ! -d RAW/${dsk} ]; then
  echo "directory RAW/${dsk} does not exist"; exit 1
fi

function createbatchdir () {
  # Usage: createbatchdir DISP

  local disp="$1"; 

  if [ ! -d ${disp}/${bat} ]; then
    echo "creating directory ${disp}/${bat}"
    mkdir -p ${disp}/${bat}
  fi

  # Ensuring a symlink from ${disp}/${bat} to RAW/${dsk}:
  if [ ! -r ${disp}/${bat}/${dsk} ]; then
    echo "${disp}/${bat}/${dsk} -> ../../../RAW/${dsk}"
    ( cd ${disp}/${bat} && ln -s ../../../RAW/${dsk} )
  fi
  if [ ! -r ${disp}/${bat}/${dsk} ]; then
    echo "link ${disp}/${bat}/${dsk} seems broken"; exit 1
  fi
}
  
function createlink () {
  # Usage: createlink RAWNAME NEWNAME DISP

  local lold="$1";
  local lnew="$2";
  local disp="$3"; 

  local fold="RAW/${dsk}/${lold}"
  local fnew="${disp}/${bat}/${lnew}"

  # Ensure that batch directory and necessary symlink exist:
  createbatchdir ${disp}
  
  # If the link is in the wrong PUB/ETC/TEC dir,
  # move it to the correct one:
  for alt in ${disps[@]}; do
    if [ "${disp}" != "${alt}" ]; then 
      if [ -r ${alt}/${bat}/${lnew} ]; then
        mv -v ${alt}/${bat}/${lnew} ${fnew}
      fi
    fi
  done

  # Create the link:
  if [ ! -e ${fnew} ]; then
    echo "${fnew} -> ${dsk}/${lold}"
    ( cd ${disp}/${bat} && ln -s ${dsk}/${lold} ${lnew} )
  elif [ -L ${disp}/${bat}/${lnew} ]; then
    echo "${fnew} already exists"
  else
    echo "${fnew} already exists and is not a link"
  fi
  if [ ! -r ${fnew} ]; then
    echo "link ${fnew} seems broken"; exit 1
  fi
}

function removelink () {
  # Usage: removelink NEWNAME

  local lnew="$1";

  local disp="xxx";
  for disp in ${disps[@]}; do
    local fnew="${disp}/${bat}/${lnew}"
    if [ -L ${fnew} ]; then
      ( cd ${disp}/${bat} && rm -v ${lnew} )
    elif [ -e ${fnew} ]; then
      echo "${fnew} is not a link"
    else
      echo "${fnew} doesnt exist"
    fi
  done
}

# Loop on arguments:
while [ $# -gt 1 ]; do
  if [ $# -lt 4 ]; then echo "usage: ${usage}"; exit 1; fi
  old="$1"; shift;
  new="$1"; shift;
  dsp="$1"; shift;
  cmt="$1"; shift;
  oldsm="${old%.*}-s.${old##*.}"
  newsm="${new%.*}-s.${new##*.}"
  oldic="${old%.*}-i.${old##*.}"
  newic="${new%.*}-i.${new##*.}"
  olden="${old%.*}-e.${old##*.}"
  newen="${new%.*}-e.${new##*.}"
  if (( ${remove} )); then
    removelink ${new}
    removelink ${newsm}
    removelink ${newic}
    removelink ${newen}
  else
    createlink ${old} ${new} ${dsp} 
    createlink ${oldsm} ${newsm} ${dsp} 
    createlink ${oldic} ${newic}  ${dsp} 
    createlink ${olden} ${newen} ${dsp} 
  fi
done

if [ ! "$1" = "eob" ]; then echo "missing 'eob', found '$1'"; exit 1; fi