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

SITES="<%= scope.lookupvar('pmwiki::sites_folder') %>"
BASE="<%= scope.lookupvar('pmwiki::www_folder') %>"

# Check for existing installations
function pmwiki_check_existing {
  if [ -e "$BASE/pmwiki-$1" ]; then
    echo "Folder $BASE/pmwiki-$1 already exists, skipping."
    exit 1
  fi  
}

# Deploy a fresh pmwiki tree
function pmwiki_deploy {
  if [ "$#" != "1" ]; then
    new="`lynx -dump http://www.pmwiki.org/pub/pmwiki/ 2> /dev/null | grep ".tgz$" | grep -v latest | sed -e 's/^.*-//' | head -1`"

    if [ -z "$new" ]; then
      echo "Unable to determine latest release, please specify it manually:"
      echo "Usage: `basename $0` deploy <version>"
    else
      new="`basename $new .tgz`"
    fi
  else
    new="$1"
  fi

  # Setup
  cd $BASE
  pmwiki_check_existing $new

  # Deploy a fresh pmwiki tree
  wget http://pmwiki.org/pub/pmwiki/pmwiki-$new.tgz
  wget http://pmwiki.org/pub/pmwiki/i18n/i18n-all.zip
  tar zxvf pmwiki-$new.tgz && rm pmwiki-$new.tgz
  ( cd pmwiki-$new && unzip -o ../i18n-all.zip && rm $_ )

  if [ ! -e "pmwiki-$new/index.php" ]; then
    ( cd pmwiki-$new && ln -s pmwiki.php index.php )
  fi

  chown -R root.root pmwiki-$new/

  # Make initial symlink
  if [ ! -e "wiki" ]; then
    ln -s pmwiki-$new wiki
  fi
}

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

  # Setup
  old="$1"
  new="$2"
  extra_folders=""
  
  pmwiki_check_existing $new

  cd $BASE
  cp -a pmwiki-$old pmwiki-$old.backup
  
  # Deploy a fresh pmwiki tree
  pmwiki_deploy $new
  
  # Copy files
  for file in .htaccess index.php farmconfig.php local config.php wiki.d; do
    if [ -e "pmwiki-$old/$file" ]; then
      cp -a pmwiki-$old/$file pmwiki-$new/
    fi
  done
  for extra_folder in $extra_folders; do
    if [ -d ../pmwiki-$old/$extra_folder ]; then
      cp -Rp ../pmwiki-$old/$extra_folder .
    fi
  done
  
  # Themes and cookbook
  rsync -av pmwiki-$old/cookbook/ pmwiki-$new/cookbook
  rsync -av --exclude=pmwiki --exclude=print pmwiki-$old/pub/skins/ pmwiki-$new/pub/skins/

  # Change symlink to point to the new location
  cd $BASE ; rm -f wiki && ln -s pmwiki-$new wiki

  # Done
  echo "Audit: `du -hs pmwiki-$old`"
  echo "Audit: `du -hs pmwiki-$new`"
  echo "Check procedure and remove pmwiki-$old once you make sure that everything is fine."
}

# Install a pmwiki instance
function pmwiki_install {
  local site="$1"

  if [ -z "$site" ]; then
    echo "Usage: `basename $0` install <name>"
    exit 1
  fi

  if [ ! -d "$BASE/wiki" ]; then
    echo "Please deploy pmwiki first"
    exit 1
  fi

  if [ ! -d "$SITES/$site" ]; then
    echo "Please configure site $site first"
    exit 1
  fi

  if [ -e "$SITES/$site/wiki/field.php" ]; then
    echo "Looks like $site wiki is already installed"
    exit 1
  fi

  # Create folder structure
  (
    mkdir -p $SITES/$site/wiki/{local,uploads,wiki.d,cookbook}

    cd $SITES/$site/wiki

    ln -s field.php index.php
    chown $site. wiki.d
    touch local/config.php
    chown root.$site local/config.php
  )

  # Setup dispatcher
  echo '<?php include("/var/www/data/wiki/pmwiki.php"); ?>' > $SITES/$site/wiki/field.php

  # Setup redirections
  cat > $SITES/$site/wiki/.htaccess <<-EOF
Options +FollowSymLinks
RewriteEngine on
RewriteRule ^/?$ https://$site.<%= scope.lookupvar('::domain') %>/Main/HomePage [R=permanent,QSA,L]
RewriteRule ^([^/a-z].*) field.php?n=\$1 [QSA,L]
EOF

  # Setup config file
  cat > $SITES/$site/wiki/local/config.php <<-EOF
<?php if (!defined('PmWiki')) exit();

\$ScriptUrl = "https://$site.<%= scope.lookupvar('::domain') %>";
\$EnablePathInfo = 1;
EOF
}

# Main procedure
if [ -z "$1" ]; then
  echo "Usage: `basename $0` <deploy|upgrade|install> [arguments]"
  exit 1
elif [ "$1" == "deploy" ]; then
  shift
  pmwiki_deploy $*
elif [ "$1" == "upgrade" ]; then
  shift
  pmwiki_upgrade $*
elif [ "$1" == "install" ]; then
  shift
  pmwiki_install $*
fi