#!/bin/bash

# auto-cpufreq-installer:
# auto-cpufreq source code based installer

SCRIPT_PATH=$(readlink -f "$0")
SCRIPT_DIR=$(dirname "${SCRIPT_PATH}")
cd "${SCRIPT_DIR}"

# check if lsb_release exists on the system before using it
if command -v lsb_release > /dev/null
then
  distro="$(lsb_release -is)"
  release="$(lsb_release -rs)"
  codename="$(lsb_release -cs)"
fi


# functions

#separator
function separator {
  local COLOUMNS="`tput cols`"
  echo -e "\n"
  printf "%0.s─" $(seq $COLOUMNS)
  echo -e "\n"
}

# root check
function root_check {
  if ((EUID != 0)); then
    separator
    echo -e "\nMust be run as root (i.e: 'sudo $0')."
    separator
    exit 1
  fi
}

function header {
	local COLOUMNS="`tput cols`"
	MID="$((COLOUMNS / 2))"
	HEADER="$1"
	printf "%0.s─" $(seq $((MID-(${#HEADER}/2)- 1)))
	echo -n " $HEADER "
	printf "%0.s─" $(seq $((MID-(${#HEADER}/2)- 1)))
	echo -e "\n"
	return
}

# python packages install
function setup_venv {
    venv_dir=/opt/auto-cpufreq/venv
    mkdir -p "${venv_dir}"
    python3 -m venv "${venv_dir}"

    source "${venv_dir}/bin/activate"
    python3 -m pip install --upgrade pip wheel
    python3 -m pip install -r requirements.txt
}

# tool install
function install {
  python3 setup.py install --record files.txt
  mkdir -p /usr/local/share/auto-cpufreq/
  cp -r scripts/ /usr/local/share/auto-cpufreq/

  # this is necessary since we need this script before we can run auto-cpufreq itself
  cp scripts/auto-cpufreq-venv-wrapper /usr/local/bin/auto-cpufreq
  chmod a+x /usr/local/bin/auto-cpufreq
}

# First argument is the distro
function detected_distro() {
  echo -e "\nDetected $1 distribution"
  separator
  echo -e "\nSetting up Python environment\n"
}

# merged functions pip - install - complete_msg, since it repeats
function completed () {
  echo -e "\nInstalling necessary Python packages\n"
  setup_venv
  separator
  echo -e "\ninstalling auto-cpufreq tool\n"
  install
}

function complete_msg() {
  separator
  cat <<- _EOF_

	auto-cpufreq tool successfully installed.

	For list of options, run:
	auto-cpufreq --help"
_EOF_
  separator
}

function manual_install {
	cat <<- _EOF_

	Didn't detect Debian or RedHat based distro.

	To complete installation, you need to:
	Install: python3, pip3, python3-setuptools

	Install necessary Python packages:
	pip3 install psutil click distro power
	Run following sequence of lines:

	-----

	python3 setup.py install --record files.txt
	mkdir -p /usr/local/share/auto-cpufreq/
	cp -r scripts/ /usr/local/share/auto-cpufreq/

	-----

	After which tool is installed, for full list of options run:

  	auto-cpufreq
_EOF_
  separator
  cat <<- _EOF_

  Consider creating a feature request to add support for your distro:
  https://github.com/AdnanHodzic/auto-cpufreq/issues/new

  Make sure to include following information:

  Distribution: $distro
  Release: $release
  Codename: $codename
_EOF_
  separator
}

function tool_install {
separator
if [ -f /etc/debian_version ]; then
	detected_distro "Debian based"
	apt install python3-dev python3-pip python3-venv python3-setuptools dmidecode -y
	completed
	complete_msg
elif [ -f /etc/redhat-release ]; then
	detected_distro "RedHat based"
	if [ -f /etc/centos-release ]; then
		yum install platform-python-devel dmidecode
	else
		yum install python-devel dmidecode
	fi
	completed
	complete_msg
elif [ -f /etc/solus-release ]; then
	detected_distro "Solus"
	eopkg install pip python3 python3-devel dmidecode
	eopkg install -c system.devel
	completed
 	complete_msg
elif [ -f /etc/os-release ];then
	eval "$(cat /etc/os-release)"
	separator
	case $ID in
	opensuse-leap)
		detected_distro "OpenSUSE"
		zypper install -y python3 python3-pip python3-setuptools python3-devel gcc dmidecode
		completed
		;;
	opensuse)
		detected_distro "OpenSUSE"
    		echo -e "\nDetected an OpenSUSE distribution\n\nSetting up Python environment\n"
		zypper install -y python38 python3-pip python3-setuptools python3-devel gcc dmidecode
		completed
		;;
	arch|manjaro|endeavouros|garuda|artix)
		detected_distro "Arch Linux based"
		pacman -S --noconfirm --needed python python-pip python-setuptools base-devel dmidecode
		completed
		;;
	void)
		detected_distro "Void Linux"
    		xbps-install -Sy python3 python3-pip python3-devel python3-setuptools base-devel dmidecode
		completed
		;;
	*) #Any other distro
	manual_install
	completed
		;;
	esac
 	complete_msg
else # In case /etc/os-release doesn't exist
	manual_install
fi
}

function tool_remove {
  files="files.txt"
  share_dir="/usr/local/share/auto-cpufreq/"

  srv_install="/usr/local/bin/auto-cpufreq-install"
  srv_install_old="/usr/bin/auto-cpufreq-install"

  srv_remove="/usr/local/bin/auto-cpufreq-remove"
  srv_remove_old="/usr/bin/auto-cpufreq-remove"

  stats_file="/var/run/auto-cpufreq.stats"

  tool_proc_rm="/usr/local/bin/auto-cpufreq --remove"
  wrapper_script="/usr/local/bin/auto-cpufreq"
  unit_file="/etc/systemd/system/auto-cpufreq.service"
  venv_path="/opt/auto-cpufreq"

  cpufreqctl="/usr/local/bin/cpufreqctl.auto-cpufreq"
  cpufreqctl_old="/usr/bin/cpufreqctl.auto-cpufreq"

  # stop any running auto-cpufreq argument (daemon/live/monitor)
  tool_arg_pids=($(pgrep -f "auto-cpufreq --"))
  for pid in "${tool_arg_pids[@]}"; do
    if [[ $tool_arg_pids != $$ ]]; then
      kill "$tool_arg_pids"
    fi
  done

  # run uninstall in case of installed daemon
  if [ -f $srv_remove -o -f $srv_remove_old -o $wrapper_script ]; then
    eval $tool_proc_rm
  else
	separator
	printf "Couldn't remove the auto-cpufreq daemon\n$srv_remove or $srv_remove_old do not exist.\n"
	exit 1;
	separator
  fi

  # remove auto-cpufreq and all its supporting files
  [ -f $files ] && cat $files | xargs sudo rm -rf && rm -f $files
  [ -d $share_dir ] && rm -rf $share_dir

  # files cleanup
  [ -f $srv_install ] && rm $srv_install
  [ -f $srv_install_old ] && rm $srv_install_old

  [ -f $srv_remove ] && rm $srv_remove
  [ -f $srv_remove_old ] && rm $srv_remove_old

  [ -f $stats_file ] && rm $stats_file
  [ -f $unit_file ] && rm $unit_file
  [ -f $wrapper_script ] && rm $wrapper_script

  [ -f $cpufreqctl ] && rm $cpufreqctl
  [ -f $cpufreqctl_old ] && rm $cpufreqctl_old

  # remove python virtual environment
  rm -rf "${venv_path}"

  separator
  echo -e "\nauto-cpufreq tool and all its supporting files successfully removed."
  separator
}

function ask_operation {
  header "auto-cpufreq installer"
  echo -e  "Welcome to auto-cpufreq tool installer.
  			\nOptions:\n"
  read -p \
"[I]nstall
[R]emove
[Q]uit

Select a key: [i/r/q]: " answer
}
# End of functions

root_check

if [[ -z "${1}" ]]; then
  ask_operation
else
  case "${1}" in
  "--install")
    answer="i"
    ;;
  "--remove")
    answer="r"
    ;;
  *)
    answer="n"
    ;;
  esac
fi

case $answer in
	I|i)
	tool_install ;;
	R|r)
	tool_remove ;;
	Q|q)
	separator
	echo ""
	exit 0 ;;
	*)
	separator
	echo -e "\nUnknown key, aborting ...\n"
	exit 1 ;;
esac