#!/bin/bash
# SPDX-License-Identifier: Apache-2.0
# Copyright (C) 2021-present Fewtarius (https://github.com/fewtarius)

. /etc/profile

DEBUG=false
COOLING_PROFILE=$(get_setting "cooling.profile")
FAN_PWM="${DEVICE_PWM_FAN}"

log $0 "Setting profile to ${COOLING_PROFILE}"

function set_control() {
  log $0 "Set fan control to ${1}"
  if [ -e "${DEVICE_PWM_FAN}_enable" ]
  then
    echo ${1} >${DEVICE_PWM_FAN}_enable
  fi
}

trap "set_control 0 && exit 0" SIGHUP SIGINT SIGQUIT SIGABRT

if [ -e "/storage/.config/fancontrol.conf" ] && [ "${COOLING_PROFILE}" = "custom" ]
then
  log $0 "Loading configuration file" 2>/dev/null
  source /storage/.config/fancontrol.conf
  if [ ! $? = 0 ]
  then
    WARN="Custom fan profile could not be loaded, defaulting to auto."
    log $0 "${WARN}"
    COOLING_PROFILE="auto"
    set_setting cooling.profile auto
  fi
fi

if [ ! "${COOLING_PROFILE}" = "custom" ]
then
  if [ "${COOLING_PROFILE}" = "aggressive" ]
  then
    SPEEDS=(255 225 192)
    TEMPS=(70000 65000 0)
  elif [ "${COOLING_PROFILE}" = "moderate" ]
  then
    SPEEDS=(255 192 128 96)
    TEMPS=(75000 70000 65000 0)
  elif [ "${COOLING_PROFILE}" = "quiet" ]
  then
    # Quiet.
    SPEEDS=(255 192 128 96 64 48 32)
    TEMPS=(75000 70000 65000 60000 55000 50000 0)
  else
    # auto
    set_control 0 >/dev/null 2>&1
    exit 0
  fi
fi

log $0 "Enabling fan control."
set_control 1 >/dev/null 2>&1

while true
do
  INDEX=0
  CPU_TEMP=$(printf "%.0f" $(awk '{ total += $1; count++ } END { print total/count }' ${DEVICE_TEMP_SENSOR}))
  $DEBUG && log $0 "CPU TEMP: ${CPU_TEMP}" 2>/dev/null
  for TEMP in "${TEMPS[@]}"
  do
    if (( "${CPU_TEMP}" > "${TEMP}" )) && \
       [ ! "${LASTSPEED}" = "${SPEEDS[${INDEX}]}" ]
    then
      $DEBUG && log $0 "Setting PWM FAN to ${SPEEDS[${INDEX}]} (${TEMP})" 2>/dev/null
      echo ${SPEEDS[${INDEX}]} >${FAN_PWM}
      LASTSPEED=${SPEEDS[${INDEX}]}
      break
    fi
    INDEX=$(( $INDEX + 1 ))
  done
  sleep 2
done

log $0 "Disabling fan control."
set_control 0 >/dev/null 2>&1