#!/bin/bash

serverName="nginx"
serverPackages="nginx"
serverSourceUrl="https://nginx.org/packages/debian/"
phpVersion="7.3"
phpName="php${phpVersion}"
phpPackages="${phpName}-{fpm,gd,mysql,curl,xml,zip,intl,mbstring,bz2,ldap,apcu,bcmath,gmp,imagick,igbinary,redis,smbclient,cli,common,opcache,readline} imagemagick"

aptOpt=
seq_config() {
  if quiet ; then
    aptOpt="-y"
  fi
}

step_1_info() {
  echoinfoArgs "[DEBIAN RELEASE]"
  echo "Setup latest apt source list for $serverName"
  echoinfo "$serverSourceUrl"
}
step_1_alias() { echo "setup"; }
step_1() {
  shift
  local osRelease=$1
  endCheckEmpty osRelease "Debian release not provided"

  info "Setup apt source for $serverName $serverSourceUrl"
  local srvSource="deb $serverSourceUrl $osRelease nginx"
  addConf -s "$srvSource" "$serverSourceLoc"
  if [ $? -eq 0 ] ; then
    info "Get repository key for $serverSourceUrl"Y
    exe apt install gnupg $aptOpt
    exe apt-key adv --keyserver keyserver.ubuntu.com --recv-keys ABF5BD827BD9BF62
  fi
}
serverSourceLoc="/etc/apt/sources.list.d/nginx.list"

step_2_info() { 
  echo "Installation of $serverName packages:"
  echoinfo "$serverPackages"
}
step_2_alias() { echo install; }
step_2() {
  exe apt update
  exe apt install $serverPackages $aptOpt
  endReturn -o $? "Failed to install $serverName"
}

step_3_info() { echo "Basic nginx configuration for initial letsencrypt certificate creation"; }
step_3() {
  # Writing acme-challenge code snipped for certbot web root authentication
  addConf -c "$snippetLetsencrypt" "$snippetLetsencryptLoc"

  # Writing minimal default (see below)
  addConf -c "$siteDefaultIp4" "$siteDefaultLoc"

  # try fix errors on first install attempt
  # (possible missing ipv6 support on system)
  if [ $ERNO -ne 0 ] ; then
    exe apt install nginx $aptOpt
  fi

  # create webroot 
  exe mkdir -p "$siteLetsencryptWww"

  sqr::echo -n "Restarting Nginx..."
  exe service nginx restart && sqr::echo "ok"
  endReturn -o $? "Failed to install $serverName"
}
snippetLetsencryptLoc="/etc/nginx/snippets/letsencrypt.conf"
siteLetsencryptWww="/var/www/letsencrypt"
snippetLetsencrypt="\
location ^~ /.well-known/acme-challenge/ {
default_type \"text/plain\";
root ${siteLetsencryptWww};
}"
siteDefaultLoc="/etc/nginx/sites-available/default"
siteDefaultIp4="server {
listen 80 default_server;

include ${snippetLetsencryptLoc}; 
}"

step_4_info() { 
  echo "Installation of $phpName packages:"
  echoinfo "$phpPackages"
}
step_4_alias() { echo "php"; }
step_4() {
  exe apt install $(eval echo $phpPackages) $aptOpt
}

phpFpmConfigLocation="/etc/php/${phpVersion}/fpm/conf.d/90-custom_pi.ini"
phpFpmConfig="memory_limit = 1024M
apc.enable_cli=1
output_buffering = Off
max_execution_time = 3600
max_input_time = 3600
post_max_size = 10240M
upload_max_filesize = 10240M
date.timezone = Europe/Berlin
session.cookie_secure = True

opcache.enable=1
opcache.enable_cli=1
opcache.memory_consumption=128
opcache.interned_strings_buffer=8
opcache.max_accelerated_files=10000
opcache.revalidate_freq=1
opcache.save_comments=1

allow_url_fopen = 1"
phpFpmConfigBu="register_argc_argv=on"

phpCliConfigLocation="/etc/php/${phpVersion}/cli/conf.d/90-custom_pi.ini"
phpCliConfig="\
apc.enable_cli=1
output_buffering = Off
max_execution_time = 3600
max_input_time = 3600
post_max_size = 10240M
upload_max_filesize = 10240M
date.timezone = Europe/Berlin"
phpPoolConfigLocation="/etc/php/${phpVersion}/fpm/pool.d/www.conf"
phpFpmIniLocation="/etc/php/${phpVersion}/fpm/php-fpm.conf"

step_5_info() { echo "Configuration of ${phpName} fpm and cli"; }
step_5() {
  local AvailableRAM=$(awk '/MemAvailable/ {printf "%d", $2/1024}' /proc/meminfo)
  local AverageFPM=$(ps --no-headers -o 'rss,cmd' -C php-fpm$phpVersion | awk '{ sum+=$1 } END { printf ("%d\n", sum/NR/1024,"M") }')
  echo $AvailableRAM
  echo $AverageFPM
  local FPMS=$((AvailableRAM/AverageFPM))
  local PMaxSS=$((FPMS*2/3))
  local PMinSS=$((PMaxSS/2))
  local PStartS=$(((PMaxSS+PMinSS)/2))


  addConf -c "$phpFpmConfig" "$phpFpmConfigLocation"
  addConf -c "$phpCliConfig" "$phpCliConfigLocation"

  addConf -a "" "$phpFpmIniLocation"
  exe sed -i "s|;emergency_restart_threshold.*|emergency_restart_threshold = 10|g" "$phpFpmIniLocation"
  exe sed -i "s|;emergency_restart_interval.*|emergency_restart_interval = 1m|g" "$phpFpmIniLocation"
  exe sed -i "s|;process_control_timeout.*|process_control_timeout = 10|g" "$phpFpmIniLocation"

  addConf -a "" "$phpPoolConfigLocation"
  exe sed -i "s/;env\[HOSTNAME\] = /env[HOSTNAME] = /" "$phpPoolConfigLocation"
  exe sed -i "s/;env\[TMP\] = /env[TMP] = /" "$phpPoolConfigLocation"
  exe sed -i "s/;env\[TMPDIR\] = /env[TMPDIR] = /" "$phpPoolConfigLocation"
  exe sed -i "s/;env\[TEMP\] = /env[TEMP] = /" "$phpPoolConfigLocation"
  exe sed -i "s/;env\[PATH\] = /env[PATH] = /" "$phpPoolConfigLocation"
  exe sed -i 's/pm.max_children =.*/pm.max_children = '$FPMS'/' "$phpPoolConfigLocation"
  exe sed -i 's/pm.start_servers =.*/pm.start_servers = '$PStartS'/' "$phpPoolConfigLocation"
  exe sed -i 's/pm.min_spare_servers =.*/pm.min_spare_servers = '$PMinSS'/' "$phpPoolConfigLocation"
  exe sed -i 's/pm.max_spare_servers =.*/pm.max_spare_servers = '$PMaxSS'/' "$phpPoolConfigLocation"
  exe sed -i "s/;pm.max_requests =.*/pm.max_requests = 1000/" "$phpPoolConfigLocation"

  sqr::echo -n "Restarting ${phpName} ... "
  exe service ${phpName}-fpm restart && sqr::echo "ok"
}

step_6_info() { echo "Installation notes"; }
step_6_alias() { echo "notes"; }
step_6() {
  cat <<NOTES_EOF
# Set user to www-data on debian an tune performance a bit
  [/etc/nginx/nginx.conf]
user www-data;
worker_processes  1;

events {
    worker_connections  1024;
    multi_accept        on;
    use                 epoll;
}

NOTES_EOF
}

readonly sqr_minVersion=16
. /usr/local/bin/sequencer.sh