#!/bin/bash
set -e

mode="$1"
version="$2"

# Source debconf library.
. /usr/share/debconf/confmodule

db_get "phabricator/domain_name"
domain_name="$RET"
db_get "phabricator/mysql_host"
mysql_host="$RET"
db_get "phabricator/phabricator_mysql_user"
phabricator_mysql_user="$RET"
db_get "phabricator/phabricator_mysql_pwd"
phabricator_mysql_pwd="$RET"
db_get "phabricator/webserver"
WWWTYPE="$RET"

#creating unprivileged system user to run the phabricator daemons
if ! getent passwd phabricator >/dev/null; then
    adduser --system  --ingroup www-data --home "/var/lib/phabricator" --quiet phabricator || true
elif [ $(id -gn phabricator) != www-data ]; then
    #we have a phabricator user, but it isn't in the right group
    usermod -g www-data phabricator
fi

local_disk_path="/var/lib/phabricator/phd_storage"
repo_default_local_path="/var/lib/phabricator/repositories"
log_directory="/var/log/phabricator"
local_conf_file="/var/lib/phabricator/local.json"

for dir in $repo_default_local_path $log_directory; do
    #create a statoverride unless one already exists
    if ! dpkg-statoverride --list $dir >/dev/null 2>&1; then
        dpkg-statoverride --update --add phabricator nogroup 755 $dir
    fi
done

[ -f "$local_conf_file" ] || echo '{}' >"$local_conf_file"

set_config() {
    #we check if the configuration option is already set or not, in order to avoid overwritting local modifications
    [[ $(/usr/share/phabricator/bin/config get $1 | jq -r '.config[] | select(.source=="local") | .status') == "set" ]] || /usr/share/phabricator/bin/config set $1 $2
}

case "$1" in
configure)
    /usr/share/phabricator/bin/config set phabricator.base-uri http://$domain_name/
esac

set_config storage.local-disk.path $local_disk_path
#PHP doesn't provide the correct timezone, so we override the (default) date.timezone php setting
#see http://us3.php.net/date_default_timezone_get
set_config phabricator.timezone $(cat /etc/timezone)

#repository.default-local-path is where phabricator daemon will set up repositories
set_config repository.default-local-path $repo_default_local_path
set_config phd.log-directory $log_directory

#be polite by default
set_config phabricator.serious-business true

if [[ -n $phabricator_mysql_user && -n $phabricator_mysql_pwd ]]; then
    /usr/share/phabricator/bin/config set mysql.host $mysql_host
    /usr/share/phabricator/bin/config set mysql.user $phabricator_mysql_user
    /usr/share/phabricator/bin/config set mysql.pass $phabricator_mysql_pwd
    set_config storage.mysql-engine.max-size 0
    /usr/share/phabricator/bin/storage upgrade --user $phabricator_mysql_user --password $phabricator_mysql_pwd --force
fi
#TODO:
#else
#	echo "Not finished. please reconfigure"

if ! dpkg-statoverride --list $local_conf_file >/dev/null 2>&1; then
    dpkg-statoverride --update --add root www-data 640 $local_conf_file
fi

### Webserver configuration

ucf --debconf-ok /usr/share/phabricator/conf_templates/phabricator.apache.conf /etc/apache2/conf-available/phabricator.conf
ucfr phabricator /etc/apache2/conf-available/phabricator.conf
ucf --debconf-ok /usr/share/phabricator/conf_templates/phabricator.lighttpd.conf /etc/lighttpd/conf-available/20-phabricator.conf
ucfr phabricator /etc/lighttpd/conf-available/20-phabricator.conf
ucf --debconf-ok /usr/share/phabricator/conf_templates/phabricator.nginx.conf /etc/nginx/sites-available/phabricator.conf
ucfr phabricator /etc/nginx/sites-available/phabricator.conf


### PHP configuration

TEMPDIR="$(mktemp --directory --tmpdir "phabricator.postinst.$$.XXXXX")"
trap "cd / ; rm -rf \"$TEMPDIR\"" EXIT

TEMP_PHP_INI="$TEMPDIR/php.ini"

# Set a value in an ini file, the key might be commented out, though
# $1: The ini file
# $2: The section
# $3: The key
# $4: The desired value
# $5: If set: Value is a number with "M" appended, desired value must
#   be this or higher
edit_ini () {
    local FILE ; FILE="$1"
    local SECTION ; SECTION="$2"
    local PARAMETER ; PARAMETER="$3"
    local VALUE ; VALUE="$4"
    local MEGS ; MEGS="${5:-}"

    CURRENT="$(crudini --get "$FILE" "$SECTION" "$PARAMETER" 2>/dev/null || :)"

    TEMP2="$TEMP_PHP_INI.1"

    if [ -z "$CURRENT" ] ; then
        # not set, perhaps commented out?
        N="$(grep -n "^; *$PARAMETER *=" "$FILE" | cut -d: -f1)"
        if [ "$N" ] ; then
            # okay, uncomment
            cp "$FILE" "$TEMP2"
            sed -i -e "$N,${N}s/^; *//" "$FILE"
            CURRENT="$(crudini --get "$FILE" "$SECTION" "$PARAMETER" 2>/dev/null || :)"
            if [ -z "$CURRENT" ] ; then
                # seldom: That didn't work, revert
                cp "$TEMP2" "$FILE"
            fi
        fi
    fi

    if [ "$CURRENT" ] ; then
        if [ "$MEGS" ] ; then
            # compare current value
            if \
                echo "$CURRENT" | grep -iq '^[0-9][0-9]*m$' &&
                [ "$(echo "$CURRENT" | sed -e 's/ *[mM]//')" -ge "$(echo "$VALUE" | sed -e 's/ *[mM]//')" ]
            then
                # good enough
                return
            fi
        elif [ "$CURRENT" = "$VALUE" ] ; then
            # value already set
            return
        fi
    fi

    # set
    crudini --set "$FILE" "$SECTION" "$PARAMETER" "$VALUE"
}


for PHP_INI in /etc/php/*/apache2/php.ini ; do
    [ -f "$PHP_INI" ] || continue

    cp "$PHP_INI" "$TEMP_PHP_INI"

    # Have a bigger post_max_size, at least 32M
    edit_ini "$TEMP_PHP_INI" 'PHP' 'post_max_size' '32M' 1

    # Configure opcache for production
    edit_ini "$TEMP_PHP_INI" 'opcache' 'opcache.validate_timestamps' '0'


    ucf --debconf-ok "$TEMP_PHP_INI" "$PHP_INI"
    # purge but don't fail if it doesn't belong to us
    ucfr --purge "$PHP_INI" 2>/dev/null || :

    # TODO: Restart apache2 upon changes
    # (not sure, config continues below)
done

# mariadb configuration
# Only if dbhost = localhost

TEMP_SERVER_CNF="$TEMPDIR/50-server.cnf"

for SERVER_CNF in /etc/mysql/mariadb.conf.d/50-server.cnf ; do
    [ -f "$SERVER_CNF" ] || continue

    cp "$SERVER_CNF" "$TEMP_SERVER_CNF"

    edit_ini "$TEMP_SERVER_CNF" 'mysqld' 'max_allowed_packet' '32M' 1

    # not at all sure about that
    edit_ini "$TEMP_SERVER_CNF" 'mysqld' 'sql_mode' 'STRICT_ALL_TABLES'

    edit_ini "$TEMP_SERVER_CNF" 'mysqld' 'innodb_buffer_pool_size' '1600M' 1

    edit_ini "$TEMP_SERVER_CNF" 'mysqld' 'local_infile' '0'

    ucf --debconf-ok "$TEMP_SERVER_CNF" "$SERVER_CNF"
    # purge but don't fail if it doesn't belong to us
    ucfr --purge "$SERVER_CNF" 2>/dev/null || :

    # TODO: Restart mariadb upon changes
done


db_stop

# Update the webserver, if needed
case $WWWTYPE in
    apache2)
        #TODO: check if this is really the best place to modify the file
        sed -i "s/  ServerName .*/  ServerName $domain_name/" /etc/apache2/conf-available/phabricator.conf
        #       Sniplet adjusted from http://wiki.debian.org/Apache/PackagingFor24
        if [ -e /usr/share/apache2/apache2-maintscript-helper ] ; then
            . /usr/share/apache2/apache2-maintscript-helper
            apache2_invoke enmod rewrite
            apache2_invoke enconf phabricator.conf
        elif  dpkg-query -f '${Version}'  -W 'apache2.2-common' > /dev/null 2>&1; then
            a2enmod -q rewrite
            [ -d /etc/apache2/conf.d/ ] && [ ! -h /etc/apache2/conf.d/phabricator.conf ] && ln -s ../conf-available/phabricator.conf /etc/apache2/conf.d/phabricator.conf
        else
            echo "Apache2 not installed, skipping"
        fi
        ;;
    lighttpd)
        if [ -e /etc/lighttpd/conf-available/20-phabricator.conf ] ; then
            sed -i "s/\$HTTP\[\"host\"\] =.* {/\$HTTP[\"host\"] == \"$domain_name\" {/" /etc/lighttpd/conf-available/20-phabricator.conf
            if which lighty-enable-mod >/dev/null 2>&1 ; then
                lighty-enable-mod phabricator
            else
                echo "Lighttpd not installed, skipping"
            fi
        fi
        ;;
    nginx)
        if [ -e /etc/nginx/sites-available/phabricator.conf ] ; then
            sed -i "s/  server_name .*/  server_name $domain_name;/" /etc/nginx/sites-available/phabricator.conf
            [ ! -h /etc/nginx/sites-enabled/phabricator.conf ] && ln -s /etc/nginx/sites-available/phabricator.conf /etc/nginx/sites-enabled/phabricator.conf
        fi
        ;;
    *)

        ;;
esac

# Always trigger reload of webservers if the configuration is enabled
if [ -e /etc/apache2/conf.d/phabricator.conf -o -e /etc/apache2/conf-enabled/phabricator.conf ] ; then
    invoke-rc.d apache2 reload || true
fi
if [ -e /etc/lighttpd/conf-enabled/20-phabricator.conf ] ; then
    #   We need to take care: bug #446324
    invoke-rc.d lighttpd reload 3>/dev/null || true
fi
if [ -e /etc/nginx/sites-available/phabricator.conf ] ; then
    invoke-rc.d nginx reload || true
fi

#we need to have a readable/writable local disk storage!
if ! dpkg-statoverride --list $local_disk_path >/dev/null 2>&1; then
    dpkg-statoverride --update --add www-data www-data 755 $local_disk_path
fi
#DEBHELPER#

echo "Installation complete. You can now access Phabricator at $(/usr/share/phabricator/bin/config get phabricator.base-uri | jq '.config[0].value')"

exit 0