post_install() {
    echo
    
    systemctl daemon-reload
    
    ### Nginx & Apache ###
    
    # If Nginx is installed and either is active, or is inactive but Apache is not installed, we prefer Nginx.
    if [[ "$(pacman -Qs nginx)" = *"local/nginx"* ]] && { [ "$(systemctl is-active nginx)" = "active" ] || [[ "$(pacman -Qs apache)" != *"local/apache"* ]] ; }
    then
        # Ensure the main conf file is present
        if [ -f /etc/nginx/nginx.conf ] 
        then
            # Configure Nginx with the folder structure used in Debian-based distributions
            if ( ! grep -q 'sites-enabled' /etc/nginx/nginx.conf )
            then
                sed -i 's|http {|http {\'$'\n    include       sites-enabled/*.conf;|g' /etc/nginx/nginx.conf
            fi
            
            # Create the sites-enabled folder if it's not already created
            if [ ! -d /etc/nginx/sites-enabled ]
            then
                mkdir -p /etc/nginx/sites-enabled
            fi
            
            # Enable ZoneMinder's server block if it's not already enabled
            if [ ! -f /etc/nginx/sites-enabled/zoneminder.conf ]
            then
                ln -sf /etc/nginx/sites-{available,enabled}/zoneminder.conf
            fi
            
            # (Re)start Nginx
            systemctl is-active --quiet nginx && systemctl stop nginx
            systemctl start nginx
        else
            echo "ERROR: Nginx was detected but file '/etc/nginx/nginx.conf' was not found. Something seems broken."
            echo
        fi
    # Else, if Nginx either is not installed, or is installed and inactive but Apache is also installed (no matter if it's active or not), we prefer Apache.
    elif [[ "$(pacman -Qs apache)" = *"local/apache"* ]]
    then
        # Ensure the main conf file is present
        if [ -f /etc/httpd/conf/httpd.conf ]
        then
            # Enable mod_proxy
            sed -i 's|#LoadModule proxy_module modules/mod_proxy.so|LoadModule proxy_module modules/mod_proxy.so|g' /etc/httpd/conf/httpd.conf
            # Enable mod_proxy_fcgi
            sed -i 's|#LoadModule proxy_fcgi_module modules/mod_proxy_fcgi.so|LoadModule proxy_fcgi_module modules/mod_proxy_fcgi.so|g' /etc/httpd/conf/httpd.conf
            # Enable mod_rewrite
            sed -i 's|#LoadModule rewrite_module modules/mod_rewrite.so|LoadModule rewrite_module modules/mod_rewrite.so|g' /etc/httpd/conf/httpd.conf
            # Enable mod_cgid
            sed -i 's|#LoadModule cgid_module modules/mod_cgid.so|LoadModule cgid_module modules/mod_cgid.so|g' /etc/httpd/conf/httpd.conf
            
            # Enable ZoneMinder's VirtualHost if it's not already enabled
            if ( ! grep -q 'zoneminder.conf' /etc/httpd/conf/httpd.conf )
            then
                echo "Include conf/extra/zoneminder.conf" >> /etc/httpd/conf/httpd.conf
            fi
    
            # (Re)start Apache
            systemctl is-active --quiet httpd && systemctl stop httpd
            systemctl start httpd
        else
            echo "ERROR: Apache was detected but file '/etc/httpd/conf/httpd.conf' was not found. Something seems broken."
            echo
        fi
    # Else, if neither of them is installed, we inform the user that something is seriously messed up.
    else
        echo "WARNING: Neither Nginx nor Apache were detected in your system. I hope you know what you're doing."
        echo
    fi
    
    ### fcgiwrap ###
    
    # By default fcgiwrap is configured to launch in 10 instances via spawn-fcgi and multiwatch. This should be
    # enough for ZoneMinder to operate with 3 cameras. If you need more than 10 simultaneous CGI threads, edit the
    # provided fcgiwrap-multiwatch.service file and increase the number of instances to whatever suits your needs.
    
    if [[ "$(pacman -Qs fcgiwrap)" = *"local/fcgiwrap"* ]]
    then
        systemctl is-active --quiet fcgiwrap.socket && systemctl stop fcgiwrap.socket
        systemctl is-active --quiet fcgiwrap && systemctl stop fcgiwrap
        systemctl is-active --quiet fcgiwrap-multiwatch && systemctl stop fcgiwrap-multiwatch
        systemctl start fcgiwrap-multiwatch
    fi
    
    ### PHP-FPM ###
    
    # To avoid modifying the global 'php.ini' file, this package uses a separate 'conf.d/zoneminder.ini' in order to apply
    # some PHP settings that ZoneMinder needs to function properly, namely to load some PHP modules and to set the correct
    # timezone.
    #
    # This has the side effect that any further changes to these specific PHP settings that have been overriden (i.e. to change
    # the timezone or to disable one of the modules) will either need to be made inside 'conf.d/zoneminder.ini', or that file
    # will have to be modified so it no longer overrides them.
    #
    # Modifying the global 'php.ini' on its own will have NO EFFECT as far as these settings are concerned.

    # Set local timezone in /etc/php/conf.d/zoneminder.ini
    sed -i 's|PLACEHOLDER|'`timedatectl | grep "Time zone" | tr -s ' ' | cut -f4 -d ' '`'|g' /etc/php/conf.d/zoneminder.ini
    
    if [[ "$(pacman -Qs php-fpm)" = *"local/php-fpm"* ]]
    then
        systemctl is-active --quiet php-fpm && systemctl stop php-fpm
        systemctl start php-fpm
    fi
    
    ### MariaDB ###
    
    # If MariaDB is installed
    if [[ "$(pacman -Qs mariadb)" = *"local/mariadb "* ]]
    then
        # Initialize MariaDB's default database if it's not already initialized
        if [ ! -d /var/lib/mysql/mysql ]
        then
            # Stop MariaDB if it's active
            systemctl is-active --quiet mariadb && systemctl stop mariadb
            mysql_install_db --user=mysql --basedir=/usr --datadir=/var/lib/mysql 2> /dev/null
        fi
        
        # Start MariaDB if it's not already active
        systemctl is-active --quiet mariadb || systemctl start mariadb
        
        # Create ZoneMinder's database & user if they do not exist
        if [ ! -d /var/lib/mysql/zm ]
        then
            # Check for database root password
            if [[ "$(mysql -uroot -e "select * from mysql.user;" 2>&1)" = *"Access denied"* ]]
            then
                # If a database root password is set
                echo "* Secure MariaDB installation found, please enter the database root password."
                echo
                mysql -uroot -p < /usr/share/zoneminder/db/zm_create.sql
                echo
                echo "* Enter the password one more time..."
                echo
                mysql -uroot -p -e "grant select,insert,update,delete,create,drop,alter,index,lock tables,alter routine,create routine,trigger,execute on zm.* to 'zmuser'@localhost identified by 'zmpass';"
                echo
            else
                # If a database root password is not set
                mysql -uroot < /usr/share/zoneminder/db/zm_create.sql
                mysql -uroot -e "grant select,insert,update,delete,create,drop,alter,index,lock tables,alter routine,create routine,trigger,execute on zm.* to 'zmuser'@localhost identified by 'zmpass';"
            fi
        fi
    fi
    
    ### ZoneMinder ###
    
    systemctl is-active --quiet zoneminder && systemctl stop zoneminder
    systemd-tmpfiles --create
    systemctl start --quiet zoneminder &&
    {  
    echo "---------------"
    echo
    
    if [[ "$(systemctl is-active nginx)" = active ]] || [[ "$(systemctl is-active httpd)" = active ]]
    then
        echo "ZoneMinder is listening at http://localhost:8095"
        echo
    else
        echo "WARNING: ZoneMinder is running, but no web server has been configured."
        echo
    fi
    echo
    }
}

post_upgrade() {
    # Parse zm.conf and all custom configuration files
    . /etc/zoneminder/zm.conf
    for CONF in /etc/zoneminder/conf.d/*.conf; do
        . $CONF
    done
    
    # Check if we're running a local database server
    if [ "$ZM_DB_HOST" = "localhost" ] || [[ "$ZM_DB_HOST" = "127.0.0.1"* ]]; then        
        systemctl daemon-reload
        
        # Make sure MariaDB is running before we attempt to use the updater
        systemctl is-active --quiet mariadb || systemctl start mariadb
        
        # Make sure ZoneMinder is *not* running before we attempt to use the updater
        systemctl is-active --quiet zoneminder && systemctl stop zoneminder
        
        echo
        echo "---------------"
        
        # Temporary solution to apply new privileges on preexisting user & database
        # Check for database root password
        if [[ "$(mysql -uroot -e "select * from mysql.user;" 2>&1)" = *"Access denied"* ]]
        then
            # If a database root password is set
            echo
            echo "* Secure MariaDB installation found, please enter the database root password."
            echo
            mysql -uroot -p -e "grant select,insert,update,delete,create,drop,alter,index,lock tables,alter routine,create routine,trigger,execute on zm.* to 'zmuser'@localhost identified by 'zmpass';"
        else
            # If a database root password is not set
            mysql -uroot -e "grant select,insert,update,delete,create,drop,alter,index,lock tables,alter routine,create routine,trigger,execute on zm.* to 'zmuser'@localhost identified by 'zmpass';"
        fi
        
        # Run the updater
        /usr/bin/zmupdate.pl --nointeractive
        /usr/bin/zmupdate.pl --nointeractive --freshen > /dev/null 2>&1
        
        # Update PTZ control presets
        /usr/bin/zmcamtool.pl --import > /dev/null 2>&1
    
        systemctl start zoneminder
    else
        echo
        echo "---------------"
        echo
        echo "Multiserver setup detected, database update skipped."
    fi
    
    post_install
}

post_remove() {
    systemctl daemon-reload && systemctl is-active --quiet zoneminder && systemctl stop zoneminder
    
    # Disable ZoneMinder's Apache VirtualHost
    if [ -f /etc/httpd/conf/httpd.conf ]
    then
        sed -i '/zoneminder.conf/d' /etc/httpd/conf/httpd.conf
    fi
    
    # Disable ZoneMinder's Nginx server block
    if [ -h /etc/nginx/sites-enabled/zoneminder.conf ]
    then
        rm /etc/nginx/sites-enabled/zoneminder.conf
        
        # If the sites-enabled directory is empty, remove it as well and also remove reference in nginx.conf
        if [ -z "$(ls -A /etc/nginx/sites-enabled)" ]
        then
            rm -r /etc/nginx/sites-enabled
            sed -i '/sites-enabled/d' /etc/nginx/nginx.conf
        fi
    fi
    
    # Notify user about ZoneMinder's database and user not being removed
    if [ -d /var/lib/mysql/zm ]
    then
        echo
        echo "ZoneMinder's database and user have been left intact. You can remove them by running the following:"
        echo
        echo "mysql -uroot -p -e \"drop database zm;\""
        echo "mysql -uroot -p -e \"drop user 'zmuser'@localhost;\""
        echo
        echo "If you haven't yet configured a password for the database root user, omit the '-p' option."
        echo
    fi
}