#!/bin/bash
set -e
. /usr/share/debconf/confmodule
PACKAGE=`basename $0 .postinst`
bold=`tput bold`
normal=`tput sgr0`

# Get the user input
case "$1" in
    configure)
            db_get maharadocs/installdir
        DIRNAME=$RET
            db_get maharadocs/giturl
        GITURL=$RET
            db_get maharadocs/logdir
        LOGDIR=$RET
            db_get maharadocs/overwrite
        OVERWRITEDIR=$RET
    ;;

    *)
        echo "postinst called with unknown argument \`$1'" >&2
        exit 1
    ;;
esac

function update_venv {
    echo "Updating Python virtual environment:"
    # If the Python virtual environment doesn't exist, try creating it.
    if [ ! -d $DIRNAME/venv ]; then
        echo "Virtual environment missing, creating a new one."
        virtualenv $DIRNAME/venv || \
            echo "${bold}*** ERROR: failed to create a virtual environment in $DIRNAME/venv${normal}"
    fi

    echo "${bold}Updating Python virtual environment...${normal}"
    . $DIRNAME/venv/bin/activate
    pip install --upgrade -r $DIRNAME/requirements.txt || \
        echo "${bold}*** ERROR: pip install failed, you may need to use a wheelhouse.${normal}"
    deactivate
}

# Check if we seem to have the correct git contents, not very trustworthy
# but better than no check :D
if [ -d $DIRNAME ]
then
    if grep -Fq "url = $GITURL" $DIRNAME/.git/config
    then
        # If we have what appears to be the correct git contents,
        # just quit the script cleanly and let the rest of the
        # packaging do its thing.
        echo "Data already exists pulling from the correct source."
        echo "Not doing any alteration of $DIRNAME."

        # Update the Python virtual environment first, though
        update_venv

        exit
    else
        # However if it looks wrong, check if its a-ok to overwrite
        if [ "$OVERWRITEDIR" == "ok" ]
        then
            echo "${bold}*******************************************************************${normal}"
            echo "${bold}* Deleting and re-fetching the Mahara manual code. The build dir  *${normal}"
            echo "${bold}* will not be rebuilt until the cron job(s) run, so you probably  *${normal}"
            echo "${bold}* want to run them manually after this installation.              *${normal}"
            echo "${bold}*******************************************************************${normal}"
            # Buhbye!
            rm -rf $DIRNAME
        else
            # Throw an error stating that we don't feel right about
            # nuking the data we can see.
            echo "${bold}The directory '$DIRNAME' already exists."
            echo "We were not told to overwrite, so we will not."
            echo "Exiting now. Retry with the overwrite option.${normal}"
            exit
        fi
    fi
fi

# Make our lovely new install from the git address.
# Despite all our checking, this can fail horribly after a long wait;
# there's not really much we can do about that now.
echo "Downloading the manual into $DIRNAME from git.mahara.org:"
echo "$GITURL"
echo "This may take a while..."
git clone $GITURL $DIRNAME

# Did we succeed?
if [ -d $DIRNAME ]
then
    # Yay!
    echo "Manual successfully downloaded into '$DIRNAME'."
else
    # In theory, we should not be here. Throw an error if we did, guessing what might
    # have happened. Git _should_ have reported all failures to download, but if the
    # directory is missing, then _something_ went wrong.
    echo "${bold}The installation failed; the manual directory could not be found.${normal}"
    echo "Please check that:"
    echo "* The directory is indeed missing. If not, it is a packaging error."
    echo "* $GITURL is accessible and downloadable on your network. Find a friendly sysadmin."
    echo "If this appears to be a packaging error, report it to info@mahara.org with all"
    echo "the text output since you tried to install this. "
    exit -1
fi

# Update the Python virtual environment
update_venv

# Make the sitelogs directory...
mkdir -p /var/log/sitelogs/mahara-manual-sphinx

echo "${bold}Setting up Apache configuration...${normal}"

cat > /etc/apache2/sites-available/mahara-manual-sphinx.conf << EOF
<VirtualHost *:80>
        ServerAdmin maharahost@catalyst.net.nz
        ServerName manual.mahara.org

        DocumentRoot ${DIRNAME}/build/html
        <Directory />
                Options FollowSymLinks
                AllowOverride None
        </Directory>
        <Directory ${DIRNAME}/build/html/>
                Options Indexes FollowSymLinks MultiViews
                AllowOverride None
                Order allow,deny
                allow from all
        </Directory>

        ErrorLog ${LOGDIR}/error.log

        # Possible values include: debug, info, notice, warn, error, crit,
        # alert, emerg.
        LogLevel warn

        CustomLog ${LOGDIR}/access.log combined

    # Convert wild existing links from before we vacated readthedocs.
    <IfModule mod_rewrite.c>
        RewriteEngine on
        RewriteRule ^(.*)/1.4_STABLE/(.*)$ $1/1.4/$2
        RewriteRule ^(.*)/1.5_STABLE/(.*)$ $1/1.5/$2
        RewriteRule   ^/$  /en/16.10/  [R]
    </IfModule>

</VirtualHost>
EOF

# Enable the site
a2ensite mahara-manual-sphinx.conf
# Restart apache
# Nicked from http://www.ilestis.ch/2011/03/03/apache-auto-restart-if-config-check/
# Check current apachectl status
# - configtest sends to str.err, so map it back to str.out
CHECKCONF=`/usr/sbin/apachectl -t 2>&1`

# httpd service
HTTPDS='httpd'

# Is Syntax OK: restart
echo "Check syntax files..."
if [ "$CHECKCONF" = "Syntax OK" ]
then
        echo "- Config seems OK."
        echo "Restarting apache..."
        RESTARTCTL=`/usr/sbin/apachectl restart 2>&1 | grep -v "httpd not running, trying to start"`

        # If restart isn't empty, an error occured
        if [ "$RESTARTCTL" != "" ]
        then
                echo "Error on restart: $RESTARTCTL"
                echo ""
        fi

        # Check if apache is running successfully
        echo "Check if httpd is running...."
        if ps ax | grep -v grep | grep $HTTPDS > /dev/null
        then
                echo "- HTTPD is running"
        else
                echo "- Error: HTTPD isn't running!"
        fi
else
        echo "Configcheck error: $CHECKCONF"
        echo ""
fi