#!/usr/bin/env bash

# Author        : Allan Christensen
# First Created : 05012022 (DD-MM-YYYY)
# Description   : Installs DokuWiki on Ubuntu 24.04
# License       : MIT License (see LICENSE file for details)

#
# Are we root
#
if [[ $(id -u) -ne 0 ]]; then echo "" && echo "Must be root or use sudo" && echo "" ; exit 1 ; fi

#
# Define variables and functions
#
hostname="$1"

#
# Get php-fpm version
#
phpfpm=$(systemctl list-units --type=service --all | awk '/php[0-9]+\.[0-9]+-fpm/ {print $1; exit}' | sed 's/\.service//')
if [[ -z "$phpfpm" ]]; then printf "\nUnable to detect php-fpm version. Is PHP-FPM installed?\n\n" ; exit 1 ; fi

#
# Function usage
#
usage () {
    printf -- "\ndokuwikiinstall\n\n"
    printf -- "Installs DokuWiki on Ubuntu\n\n"
    printf -- "Usage:\n"
    printf -- "sudo ./dokuwikiinstall <domain>\n"
    printf -- "Examples:\n"
    printf -- "sudo ./dokuwikiinstall wiki.something.xyz\n\n"
}

#
# Function check if a service is running or stopped, including php-fpm
#
checkservice() {
    local svc="$1" ; local mode="$2"

    if [[ "$svc" == php*-fpm ]] && ! systemctl list-unit-files --type=service | grep -q "^${svc}.service" ; then
        svc="php-fpm"
    fi

    if [[ "$mode" == "mustberunning" ]]; then
        if ! systemctl is-active --quiet "$svc" 2>/dev/null; then
            printf "\nService %s is not running, aborting...\n\n" "$svc"
            exit 1
        fi
    elif [[ "$mode" == "mustnotberunning" ]]; then
        if systemctl is-active --quiet "$svc" 2>/dev/null; then
            printf "\nService %s is already running, aborting...\n\n" "$svc"
            exit 1
        fi
    fi
}

#
# Function input check
#
inputcheck () { if [[ -z "$1" ]]; then usage ; printf "ERROR: DOMAIN CANNOT BE EMPTY!\n\n" ; exit; fi; }

#
# If Nginx or PHP-Fpm is not running then die.
#
checkservice nginx mustberunning ; checkservice "$phpfpm" mustberunning

#
# Let's go
#
clear

#
# Check if input conditions are met
#
inputcheck "$hostname"

#
# Clone nginx-snippets; if nginx-snippets exists then just pull latest changes
#
nginxsnippets="/etc/nginx/nginx-snippets"
repo="https://git.x-files.dk/webserver/nginx-snippets.git"
if [[ -d "$nginxsnippets/.git" ]]; then git -C "$nginxsnippets" pull --quiet; else git clone --quiet "$repo" "$nginxsnippets"; fi

#
# Download the latest Dokuwiki
#
wikidir="/var/www/html/$hostname" ; mkdir -p "$wikidir"
curl -sL https://download.dokuwiki.org/src/dokuwiki/dokuwiki-stable.tgz | tar -xzf - -C "$wikidir" --strip-components=1 || { echo "Download or extraction failed"; exit 1; }
chown -R www-data: "$wikidir"

#
# Create a DokuWiki nginx configuration file
#
cp "$nginxsnippets/hostfiles/dokuwiki.80.conf" /etc/nginx/conf.d/"$hostname".conf
sed -i -- "s/DOMAIN/$hostname/g" /etc/nginx/conf.d/"$hostname".conf
sed -i "s/PHPVERSION/$phpfpm/" /etc/nginx/conf.d/"$hostname".conf

#
# Restarting Nginx and Phpfpm for changes to take effect
#
systemctl restart "$phpfpm"
systemctl restart nginx

#
# Create postinstall script
#
cat > /tmp/dokuwiki-postinstall <<EOF
#!/usr/bin/env bash

#
# Dokiwiki Postinstall Script
#

#
# Are we root?
#
if [[ $(id -u) -ne 0 ]]; then echo "" && echo "Must be root or use sudo" && echo "" ; exit ; fi

#
# Hardening of Dokuwiki
#
sed -i 's/# location /location /g' /etc/nginx/conf.d/"$hostname".conf

#
# Restart Nginx for changes to take effect
#
systemctl restart nginx

#
# Cleaning up
#
rm -f /tmp/dokuwiki-postinstall
EOF

chmod 755 /tmp/dokuwiki-postinstall

#
# DokuWiki postinstall notice
#
wikinotice=$(cat <<EOF
-----------------------------------------------------------------------------------
IMPORTANT: Go to http://$hostname/install.php in order to complete the installation:

Don't worry about the warning on the right side of the page this will be
fixed as there still is a post install step to do.

Once done run the following command as root or using sudo.

sudo /tmp/dokuwiki-postinstall
-----------------------------------------------------------------------------------
EOF
)

#
# Print notice
#
printf '%s\n' "$wikinotice"

#
# All done
#
printf "\nAll Done...\n"

#
# End of script
#