#!/bin/ksh
trap 'echo "Received signal, aborting ..."; wait; exit 1' 1 2 3 15

#begin
#
# odb4to1 : converts database's I/O-method#4 to #1
#           using hcat-utility
#
# Usage : odb4to1
#
#end

set -eu

mysort=$ODB_FEBINPATH/mysort

dbname=$(basename "$(\ls -C1 *.dd 2>/dev/null | head -1)" .dd)
if [[ "$dbname" = "" ]] ; then
  echo "***Error: Unable to determine database name"
  exit 1
fi

if [[ ! -f $dbname.iomap ]] ; then
  echo "***Error: Database '$dbname' has no I/O-map file"
  exit 2
fi

ddfile=$dbname.dd

iom=$(head -1 $ddfile | awk 'BEGIN {n=1;} {if (NF >= 3) n=$3;} END {print n;}')
if [[ $iom -ne 4 ]] ; then
  echo "***Error: Database '$dbname' I/O-method is not #4"
  exit 3
fi

npools=$(head -5 $ddfile | tail -1)

tables=$(egrep ^@ $ddfile | perl -ne 'print "$1\n" if (m/^\@(\S+)\s+\d+/)' | perl -pe 's/\n/ /g;')

\rm -rf _
mkdir _

export TMPDIR=${TMPDIR:=/tmp}

cmdfile=$TMPDIR/cmdfile.$$
cat /dev/null > $cmdfile

export ODB_PARAL=${ODB_PARAL:=3}
paral=$ODB_PARAL

if [[ $paral -eq  1 ]] ; then
  echo '#!/bin/ksh' >> $cmdfile
  echo 'set -eu'    >> $cmdfile
  chmod u+rx $cmdfile
fi

in_error=$TMPDIR/in_error.$$
\rm -f $in_error

# reorder tables for optimal parallel dcagen: largest tables first
# for this we need the actual cumulative filesizes for each table

sizes=$TMPDIR/sizes.pl.$$
cat > $sizes <<'EOF'
use strict; my %cnt = (); my $size; my $key;
for (<>) { next if (m/^\s*$/); s/^\s+//; s|\s+\d+/| |; 
($size,$key) = split/\s+/; $cnt{$key} += $size; }
foreach $key (keys(%cnt)) { $size = $cnt{$key}; print "$size $key\n"; }
EOF

#-- AIX doesn't seem to support 'xargs -r', but its 'xargs' by default implies -r ...
xargs_r=$(echo "" | xargs -r 2>/dev/null && echo "xargs -r" || echo "xargs")

tables=$(\
    (echo "$tables" | perl -pe 's/\s*(\w+)/0 $1\n/g;' ; \
    find [0-9]* -type f -follow | $xargs_r ls -C1s) | \
    perl -w $sizes | $mysort -nr +0 | awk '{print $NF}' | perl -pe 's/\n/ /g;')

\rm -f $sizes

for t in $tables
do
  echo "$ODB_FEBINPATH/hcat -41 -l $dbname -t $t -n $npools || touch $in_error" >> $cmdfile
done

export ODB_DATAPATH_$dbname=.
export ODB_SRCPATH_$dbname=.
export IOASSIGN=$dbname.IOASSIGN

if [[ $paral -eq 1 ]] ; then
  $cmdfile
else
  nmaxcmd=$(wc -l $cmdfile)
  env ODB_PARAL=$paral $ODB_FEBINPATH/fscheduler.x $nmaxcmd
fi
\rm -f $cmdfile

if [[ -f $in_error ]] ; then
  echo "***Error: There were error(s) in 4-to-1 creation"
  \rm -f $in_error
  exit 4
fi

#-- Alter .dd-file
awk '{ if (NR == 1) { print $1,$2,1; } else { print; }}' < $ddfile > $ddfile.tmp
\mv $ddfile.tmp $ddfile

#-- Remove the I/O-map file
\rm -f $dbname.iomap

#-- Remove existing data dirs
\rm -rf [0-9]*

#-- Bring the re-generated data dirs one level up
\mv _/[0-9]* .
\rm -rf _

#-- Re-generate DCAs
\rm -rf dca
dcagen -z -F -n -q 2>/dev/null || :
dcafix -q

#-- Clean-up
odbclean -f