#!/usr/bin/env bash

readonly toolName=php
readonly sq_repoUrl="https://packages.sury.org/php"

# Already defined by sequencer.sh, but may be overwritten
#readonly seq_configName="${sq_scriptName:?}.cfg"
#readonly seq_configTemplate="${seq_origin:?}/${sq_configName:?}.example"

sq_aptOpt=
sq_config=0

sq_phpName=php
sq_FpmConfig=
sq_CliConfig=
sq_PoolConfig=
sq_FpmIni=

seq_config() {
  if initSeqConfig "${seq_configName:?}" "${seq_configTemplate:?}" ; then
    sq_config=1
  else
    # End if no configuration file exists
    dry || return 1
  fi

  ## Apt cmdline option to suppress user interaction
  interactive || sq_aptOpt="-y"

  ## Disable error checks if external scripts are used
  ## e.g. error on unbound variables
  #disableErrorCheck

  sq_phpName="php${sc_phpVersion:?}"

  # Default dependencies for this seq
  sc_phpPackages+=(fpm cli)

  # Prepare php packages to be installed
  sq_phpPackages="${sc_phpPackages[@]/#/${sq_phpName}-}"
  
  sq_FpmConfig="/etc/php/${sc_phpVersion:?}/fpm/conf.d/90-custom_pi.ini"
  sq_CliConfig="/etc/php/${sc_phpVersion:?}/cli/conf.d/90-custom_pi.ini"
  sq_PoolConfig="/etc/php/${sc_phpVersion:?}/fpm/pool.d/www.conf"
  sq_FpmIni="/etc/php/${sc_phpVersion:?}/fpm/php-fpm.conf"

  ## Return of non zero value will abort the sequence
  return 0
}

getPhpVersion() {
  local lPhp=
  if ! lPhp="$(command -v php >>/dev/null && php -r 'echo PHP_MAJOR_VERSION.".".PHP_MINOR_VERSION;')"; then
    return 1
  fi
  echo ${lPhp}
}

step_1_info() { echo "Installation status"; }
step_1_alias() { echo "status"; }
step_1() {
  exe apt-cache policy ${sq_phpName}-common
}

step_3_info() { echo "Get installed PHP version"; }
step_3_alias() { echo "version"; }
step_3(){
  if ! lPhp="$(getPhpVersion)" ; then
    warning "PHP not yet installed"
    return 1
  fi
  echo "$lPhp"
}

step_5_info() { 
  echoinfoArgs "[PHP_PACKAGE_NAME ...]"
  echo "Install ${toolName:-'-'} packages prepending the correct version"
}
step_5_alias() { echo "add"; }
step_5() {
  shift
  local packages=("$@")
  (( ${#packages[@]} )) || fatal "No packages provided"
  exe apt install "${packages[@]/#/${sq_phpName}-}" ${sq_aptOpt:-}
}

step_10_info() { echo "Setup debian ${toolName:-'-'} repository"; }
step_10_alias() { echo "setup"; }
step_10() {
  local lArch=
  case $(uname -m) in
    aarch64)
      lArch=arm64;;
  esac
  if [[ -n ${lArch:-} ]] ; then
    info "Detected processor architecture: ${lArch}"
    lArch="[arch=${lArch}]"
  fi

  info "Installing custom repository prerequisites:"
  exe apt update
  exe apt install apt-transport-https lsb-release ca-certificates curl ${sq_aptOpt:-}
  info "Setup ${toolName:-'-'} repository including gpg key"
  exep curl -fsSL  ${sq_repoUrl:?}/apt.gpg "|" gpg --dearmor -o /etc/apt/trusted.gpg.d/sury-keyring.gpg
  addConf -c "deb ${lArch:-} ${sq_repoUrl:?} $(lsb_release -sc) main" "/etc/apt/sources.list.d/php.list"
  exe apt-get update
}

step_11_info() { 
  echo "Installation of ${toolName:-'-'} packages:"
  echoinfo "${sq_phpPackages:-"(customize with '${seq_name} -c')"}"
}
step_11_alias() { echo "install"; }
step_11() {
  exe apt install ${sq_phpPackages} ${sq_aptOpt}
}

phpFpmConfig="date.timezone = Europe/Berlin
max_execution_time = 600
memory_limit = 1024M
output_buffering = Off
session.cookie_secure = True
upload_max_filesize = 1024M"

phpCliConfig="date.timezone = Europe/Berlin
output_buffering = Off"

step_20_info() { echo "Configuration of ${sq_phpName} fpm and cli"; }
step_20_alias() { echo "conf_fpm_cli"; }
step_20() {
  addConf -s "$phpFpmConfig" "$sq_FpmConfig"
  addConf -s "$phpCliConfig" "$sq_CliConfig"

  restart_php
}

step_22_info() { echo "Configure ${toolName} pool ondemand"; }
step_22_alias() { echo "conf_pool_ondemand"; }
step_22() {
  info "Setting ${toolName} pool to 'ondemand'"
  
  addConf -a "" "$sq_FpmIni"
  exe sed -i "s/^[;[:space:]]*pm =.*/pm = ondemand/" "$sq_PoolConfig"
  
  restart_php
}

step_24_info() { echo "Configure ${toolName} pool dynamic"; }
step_24_alias() { echo "conf_pool_dynamic"; }
step_24() {
  local AvailableRAM=$(awk '/MemAvailable/ {printf "%d", $2/1024}' /proc/meminfo)
  local AverageFPM=$(ps --no-headers -o 'rss,cmd' -C php-fpm${sc_phpVersion} | awk '{ sum+=$1 } END { printf ("%d\n", sum/NR/1024,"M") }')
  local FPMS=$((AvailableRAM/AverageFPM))
  local PMaxSS=$((FPMS*2/3))
  local PMinSS=$((PMaxSS/2))
  local PStartS=$(((PMaxSS+PMinSS)/2))

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

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

restart_php() {
  info -n "Restarting ${sq_phpName} fpm ... "
  exe service ${sq_phpName}-fpm restart && info -d "ok" || info -d "nok"
}


# shellcheck disable=SC2034 # Appears unused
readonly sqr_minVersion=16
# shellcheck disable=SC1091 # Don't follow this source
. /usr/local/bin/sequencer.sh