function msg() {
   local str="$1"
   local verbose="$2"
   local newline="$3"
   if [ "$verbose" != "true" ]; then
      return 1
   fi
   if [ "$newline" == "true" ]; then
      echo "$str"
   else
      echo -n "$str"
   fi
}

# force the production enviroment
export RAILS_ENV=production

# move to the correct directory
cd $1/..

# verbose mode
verbose="$3"

# make a copy of the old contents
msg "Making a safety copy of the old contents on traq/$2 ... " "$verbose" "false"
zip -q traq/$2.safe.zip `cat traq/$2.list` &> /dev/null
msg "done." "$verbose" "true"

# check the current Gemfile checksum
old_gemfile_md5=$(md5sum Gemfile 2> /dev/null | cut -f1 -d' ')

# install the new files
msg "Unzipping $2.zip ... " "true" "false"
unzip -o traq/$2.zip &> /dev/null
msg "done." "true" "true"

# check the new Gemfile checksum
new_gemfile_md5=$(md5sum Gemfile 2> /dev/null | cut -f1 -d' ')

# if the current Gemfile is different, run bundle install
if [ -f Gemfile -a "$old_gemfile_md5" != "$new_gemfile_md5" ]; then

   if [ -f Gemfile.lock ]; then     # if there is a Gemfile.lock file ... 
      if [ -w Gemfile.lock ]; then  # ... and it is writable
         msg "Running bundle install ..." "true" "true"
         bundle install
      else
         msg "Gemfile.lock exists but it is not writable, not running bundle install." "true" "true"
      fi
   fi

   if [ ! -f Gemfile.lock ]; then   # if there is not a Gemfile.lock file ...
     if [ -w . ]; then              # ... and current dir is writable
         msg "Running bundle install ..." "true" "true"
         bundle install
      else
         msg "Gemfile.lock does not exists but current dir is not writable, not running bundle install" "true" "true"
      fi
   fi
fi

# run migrations if needed
migrations=$(grep "^db/migrate" traq/$2.list)
if [ -n "$migrations" ]; then
	msg "Running migrations ... " "true" "true"
	bundle exec rake db:migrate 2> /dev/null
   msg "Migrations done." "true" "true"
fi

# precompile assets if needed
if [ -d app/assets ]; then
   msg "Compiling assets ... " "$verbose" "false"
   bundle exec rake assets:precompile 2> /dev/null
   msg "done." "$verbose" "true"
fi

# change file permissions on public dir
if [ -d public ]; then
   msg "Changing file permissions on public to 0755 ... " "$verbose" "false"
   chmod -R 0755 public/*
   msg "done." "$verbose" "true"
fi

# restart server
if [ -x ./traq/server.sh -a -f ./traq/server.sh ]; then
   ./traq/server.sh
fi   

# extra configs
if [ -x ./traq/extra.sh -a -f ./traq/extra.sh ]; then
   ./traq/extra.sh
fi

# erase file
rm traq/$2.zip