#!/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

sep="\n-------------------------------------------------------------------------------"

# functions

#separator
function separator {
  echo -e $sep
}
# 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
}

# 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
  echo -e "\nauto-cpufreq tool successfully installed.\n"
  echo -e "For list of options, run:\nauto-cpufreq --help"
  separator
}

function manual_install {
  echo -e "\nDidn't detect Debian or RedHat based distro.\n"
  echo -e "To complete installation, you need to:"
  echo -e "Install: python3, pip3, python3-setuptools\n"
  echo -e "Install necessary Python packages:"
  echo -e "pip3 install psutil click distro power"
  echo -e "\nRun following sequence of lines:"
  echo -e "\n-----"
  echo -e "\npython3 setup.py install --record files.txt"
  echo -e "mkdir -p /usr/local/share/auto-cpufreq/"
  echo -e "cp -r scripts/ /usr/local/share/auto-cpufreq/"
  echo -e "\n-----"
  echo -e "\nAfter which tool is installed, for full list of options run:"
  echo -e "auto-cpufreq"
  separator
  echo -e "\nConsider creating a feature request to add support for your distro:"
  echo -e "https://github.com/AdnanHodzic/auto-cpufreq/issues/new"
  echo -e "\nMake sure to include following information:\n"
  echo -e "Distribution: $distro"
  echo -e "Release: $release"
  echo -e "Codename: $codename"
  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/bin/auto-cpufreq-install"
  srv_remove="/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/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 ]; then
    eval $tool_proc_rm
  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_remove ] && rm $srv_remove
  [ -f $stats_file ] && rm $stats_file
  [ -f $unit_file ] && rm $unit_file
  [ -f $wrapper_script ] && rm $wrapper_script
  [ -f $cpufreqctl ] && rm $cpufreqctl

  # 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 {
  echo -e "\n-------------------------- auto-cpufreq installer -----------------------------"
  echo -e "\nWelcome to auto-cpufreq tool installer."
  echo -e "\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