#!/bin/bash
#
# Drupal management script.
#

BASE="<%= apache_www_folder %>"
SERIES="5 6"

# Get drupal major version
function get_major {
  echo $1 | sed -e 's/\(^.\).*/\1/'
}

# Deploy a fresh drupal tree
function drupal_deploy {
  if [ "$#" != "1" ]; then
    echo "Usage: `basename $0` deploy <version>"
    exit 1
  fi

  # Setup
  new="$1"
  cd $BASE

  # Deploy a fresh drupal tree
  wget http://ftp.drupal.org/files/projects/drupal-$new.tar.gz
  tar zxvf drupal-$new.tar.gz && rm drupal-$new.tar.gz
  chown -R root.root drupal-$new/
  cd drupal-$new && rm -rf sites
}

# Update all drupal instances in the host
function drupal_update {
  for version in $SERIES; do
    # Setup base and sites folders
    base="$BASE/drupal-$version"
    cd $base/sites
    drupals="`ls -I default -I all`"
  
    # Issue updates
    for drupal in $drupals; do
      # Ignore symlinks so sites are updated just once
      if [ ! -h $drupal ]; then
        echo "Processing $drupal..."
        drush -l $drupal update
      fi
    done
  
    # Fix permissions
    chown -R root.root $base/sites/all/modules
    chown -R root.root $base/sites/all/themes
  done
}

# Upgrade a drupal instance using upstream source.
function drupal_upgrade {
  if [ "$#" != "2" ]; then
    echo "Usage: `basename $0` upgrade <old_version> <new_version>"
    exit 1
  fi

  # Setup
  old="$1"
  new="$2"
  old_major="`get_major $old`"
  new_major="`get_major $new`"
  extra_folders=""
  
  if [ "$old_major" != "$new_major" ]; then
    echo "Major versions doesn't match"
    exit 1
  fi
  
  # Set drupal series
  if [ "$new_MAJOR" == "4" ]; then
    # Get minor versions
    new_minor="`echo $new | sed -e "s/^$new_major\.//"`"
    old_minor="`echo $old | sed -e "s/^$old_major\.//"`"
  
    if [ "$old_minor" != "$new_minor" ]; then
      echo "Minor versions doesn't match"
      exit 1
    fi
    drupal_series="$new_MAJOR.$MINOR"
  else
    drupal_series="$new_MAJOR"
  fi
  
  cd $BASE
  
  # Deploy a fresh drupal tree
  drupal_deploy $new
  
  # Copy files
  cp -Rp ../drupal-$old/{.htaccess,favicon.ico,files/,sites/} . &> /dev/null
  for extra_folder in $extra_folders; do
    if [ -d ../drupal-$old/$extra_folder ]; then
      cp -Rp ../drupal-$old/$extra_folder .
    fi
  done
  
  # Legacy stuff for Drupal 4.x.x
  if [ "$new_MAJOR" == "4" ]; then
    rsync -av ../drupal-$old/themes/ themes/
    for module in `ls ../drupal-$old/modules`; do
      if [ -d "../drupal-$old/modules/$module" ]; then
        cp -Rp ../drupal-$old/modules/$module modules/
      fi
    done
  fi
  
  # Copy installation profiles for Drupal 5.x or newer
  if [ "$new_MAJOR" != "4" ]; then
    rsync -av --exclude=default ../drupal-$old/profiles/ profiles/
  fi
  
  # Change symlink to point to the new location
  cd $BASE ; rm drupal-$drupal_series && ln -s drupal-$new drupal-$drupal_series
  
  # Done
  echo "Check procedure and remove drupal-$old once you make sure that everything is fine."
}

# Main procedure
if [ -z "$1" ]; then
  echo "Usage: `basename $0` <command> [arguments]"
  exit 1
elif [ "$1" == "deploy" ]; then
  shift
  drupal_deploy $*
elif [ "$1" == "update" ]; then
  shift
  drupal_update $*
elif [ "$1" == "upgrade" ]; then
  shift
  drupal_upgrade $*
fi