#!/bin/bash

# do not rely on hostname(1), might return hostname of the
# deployment system when initially deploying via chroot
if [ -r /etc/hostname ] ; then
  hostname="$(cat /etc/hostname)"
else
  hostname=$(hostname)
fi

if [ -z "${hostname}" ] ; then
  echo "Error: hostname could not be identified." >&2
  exit 1
fi

/etc/init.d/mysql start || true
. /etc/mysql/sipwise.cnf

if [ -z "${SIPWISE_DB_PASSWORD}" ] ; then
  echo 'Error: SIPWISE_DB_PASSWORD is unset (using /etc/mysql/sipwise.cnf).' >&2
  exit 1
fi

if ! mysql -e "GRANT ALL PRIVILEGES ON *.* TO sipwise@localhost IDENTIFIED BY '${SIPWISE_DB_PASSWORD}' WITH GRANT OPTION;" ; then
  echo 'Error: grants for user sipwise on localhost could not be applied.' >&2
  exit 1
fi

# support automated installation
if [ -n "$AUTOMATED_INSTALL_MODE" ] ; then
  echo "Running in automated installation mode, ignoring check for empty db_schema."
else
  if [ "$(mysql -usipwise -p${SIPWISE_DB_PASSWORD} -e 'use ngcp; select * from db_schema;' 2>/dev/null)" = "" ] ; then
    echo "================================================================="
    echo "Warning: the db_schema table of the ngcp database is empty."
    echo "Are you sure you want to proceed with applying db-schema changes?"
    printf "Please type 'agree' to really continue: "

    unset AGREE
    read AGREE
    if [ "$AGREE" != "agree" ]; then
      echo "Exiting as requested." >&2
      exit 1
    fi
  fi
fi

if ! mysql -usipwise -p${SIPWISE_DB_PASSWORD} -e 'use ngcp;' 2>/dev/null ; then
  mysql -usipwise -p${SIPWISE_DB_PASSWORD} < /usr/share/ngcp-db-schema/db_scripts/init/0005_create_ngcp.up
fi

if ! mysql -usipwise -p${SIPWISE_DB_PASSWORD} -e 'use ngcp;' 2>/dev/null ; then
  echo 'Error: ngcp database does not exist.' >&2
  exit 1
fi

if ! mysql -usipwise -p${SIPWISE_DB_PASSWORD} ngcp -e 'describe db_schema'  >/dev/null; then
  echo 'Error: db_schema table does not exit.' >&2
  exit 1
fi

if [ -x /usr/sbin/ngcp-check_active ] ; then
  if /usr/sbin/ngcp-check_active -q ; then
    echo "This seems to be the active node, nothing to do."
    exit 0
  else
    # TODO - what about /usr/share/ngcp-upgrade-2.4/db/5670.up?
    echo "This seems to be the inactive node, registering revisions."
  fi
fi

revision_wrapper() {
  [ -n "$1" ] || return 1

  for rev in $* ; do
    revname="$(basename $rev)"

    cd $(dirname $rev) || exit 1 # would fail if a script references a file (like language_strings.txt) in its CWD

    if ngcp-check-rev-applied --schema db_schema --revision "$revname" ; then
      echo "Revision $revname has been applied already, nothing to do."
      continue
    fi
  
    printf "Applying revision script %s: " "$rev"
    if mysql -usipwise -p${SIPWISE_DB_PASSWORD} < "$rev" ; then
      echo done
    else
      echo "failed. :("
      exit 1
    fi

    if mysql -usipwise -p${SIPWISE_DB_PASSWORD} ngcp -e "insert into db_schema values (0, '${revname}', \""${hostname}"\", CURRENT_TIMESTAMP);" ; then
      echo "Marked revision $rev for being applied."
    else
      echo "Error while executing DB commands using revision $rev for host $hostname" >&2
      exit 1
    fi
  done
}

revision_wrapper /usr/share/ngcp-db-schema/db_scripts/base/*.up
revision_wrapper /usr/share/ngcp-db-schema/db_scripts/diff/*.up
# TODO language_wrapper

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