#!/bin/ash

############################################
# @description:                            #
#   (Re)install/update and configure PHP   #
#                                          #
# @project: HomeserverCTs                  #
# @target: Alpine Linux based CT's         #
############################################

#ScriptConfig
self=$0

Configurations="nextcloud freshrss heimdall mailbackup"
SupportedAlpineVersion=3.21
NewPHPVer=84
SkipAlpineRelCheck=false

#Git configuration only used for Upgrades and Fresh mode
gitRepo=https://git.bprieshof.nl/brammp/HomeServerCTs
gitBranch=main

#AlpineCheck
if [[ $(cat /etc/os-release | grep -m 1 ^"ID=") != *"alpine"* ]]; then echo Not on Alpine Linux ;exit 1;fi

#AlpineVersionCheck

if $SkipAlpineRelCheck ; then echo "Notice: Alpine releas check skipped"
elif [[ $(grep "^VERSION_ID=" /etc/os-release | awk -F= '{print $2}') != *"$SupportedAlpineVersion"* ]]; then printf "This Alpine Linux is not supported by default,\nto continue set SkipAlpineRelCheck to true and check the targeted php version in the script\n" ;exit 1;fi

#Functions for menu/core use
show_help () {
    cat <<END_HELP
Usage: $self [-dfpuh] <Config name>

Options:
    -d,  Distrobuilder: Install everything and use Local configs (non interactive)
    -f,  Fresh:         Install everything and fetch config
    -p,  Purge:         Remove all PHP packlages and back configuration (handy for distro release upgrades)
    -u,  Upgrade:       Run both Purge and Install steps

Cnfigurations:
    $Configurations

END_HELP
}

set_mode () {
    if [ ! -z "$mode" ]; then echo "ERROR: Unable to use multiple modes at once";exit 1;fi
    mode=$1
}

echo_exit (){
    echo
    exit 1
}

#Arugment/optin handeling
while getopts 'dfpuh' opt; do
    case $opt in
        d) set_mode distrobuilder;;
        f) set_mode fresh ;;
        p) set_mode purge ;;
        u) set_mode upgrade ;;
        h) show_help
           exit ;;
        *) show_help
           exit 1
    esac
done

shift "$(( OPTIND - 1 ))"
for config do
    config=$config
done

if [ -z "$mode" ]; then
    printf "ERROR: No mode argument given\n\n"
    show_help
    exit 1
elif [ -z "$config" ]; then
    printf "ERROR: No configuration argument given\n\n"
    show_help
    exit 1
elif [[ -z "$(echo "$Configurations" | fgrep -w "$config")" ]]; then
    printf "ERROR: Invalid configuration argument given\n\n"
    show_help
    exit 1
fi 


#Functions for mode

#Backup PHP config and purge PHP packages
run_Purge() {
    #Check if PHP is installed
    if ! command -v php &> /dev/null; then printf "ERROR: PHP is not installed\n\n"; exit 1;fi
    #Get current PHP Version
    OldPHPVer=$(grep php /etc/apk/world -m 1|sed -e "s/\-.*//" -e "s/php//")
    #Create Backup an its location
    if [[ ! -d "/opt/PHPCfgBackup/" ]];then mkdir -p "/opt/PHPCfgBackup"; fi
    tar -czf "/opt/PHPCfgBackup/PHP$OldPHPVer-Config.tar.gz" -C "/etc/php$OldPHPVer" ./
    rm -rf "/etc/php$OldPHPVer"

    #Set placeholder in Nginx for PHP Socket
    sed -i -e 's/'$OldPHPVer'/PHPver/g' /etc/nginx/nginx.conf
    #Purge PHP packages
    apk del php*
}

#(re)install PHP packages
run_Install() {
    cat $configStore/php.pkglist | xargs apk add
    #Configure Php-Fpm
    echo ";Placeholder" > /etc/php$NewPHPVer/php-fpm.d/www.conf
    sed -i -e 's/PHPver/'$NewPHPVer'/g' $configStore/php.conf
    mv $configStore/php.conf /etc/php$NewPHPVer/php-fpm.d/$config.conf
    printf "[Date]\ndate.timezone = Europe/Amsterdam" >/etc/php$NewPHPVer/conf.d/04_date_timezone.ini
    
    #Configure Nginx PHP Socket
    sed -i -e 's/PHPver/'$NewPHPVer'/g' /etc/nginx/nginx.conf

    #Unique settings for configuration
    case $config in
        nextcloud)
            echo runnig distrobuilder
            #Configure Php-Cli
            sed -i '/memory_limit =/c\memory_limit = 512M' /etc/php$NewPHPVer/php.ini
            echo "apc.enable_cli=1" >> /etc/php$NewPHPVer/php.ini
        ;;
    esac
    
    #Enable service(s) on boot
    rc-update add php-fpm$NewPHPVer
}

fetch_Config() {
    #Unique settings for configuration
    case $config in
        mailbackup)
            wget  https://git.bprieshof.nl/Tools/MailBackup-sys/raw/branch/alpine/Configs/php.conf -O /tmp/php.conf || echo_exit "ERROR: Config download failed"
            wget  https://git.bprieshof.nl/Tools/MailBackup-sys/raw/branch/alpine/Configs/php.pkglist -O /tmp/php.pkglist || echo_exit "ERROR: Config download failed"
        ;;
        *)
            wget  "$gitRepo"/raw/branch/"$gitBranch"/CT-Files/$config/Configs/php.conf -O /tmp/php.conf || echo_exit "ERROR: Config download failed"
            wget  "$gitRepo"/raw/branch/"$gitBranch"/CT-Files/"$config"/Configs/php.pkglist -O /tmp/php.pkglist || echo_exit "ERROR: Config download failed"
        ;;

    esac
}

case $mode in
    distrobuilder)
        #Set config location
        configStore=/opt/Setup/Configs
        run_Install
    ;;
    fresh)  
        fetch_Config
        #Set config location
        configStore=/tmp
        run_Install
    ;;
    purge)
        run_Purge
    ;;
    upgrade)
        #Set config location
        configStore=/opt/Setup/Configs
        fetch_Config
        service nginx stop
        run_Purge
        run_Install
        service nginx start
    ;;
esac