#!/bin/bash
#
# Copyright 2016 Advanced Micro Devices, Inc.
#
# Permission is hereby granted, free of charge, to any person obtaining a
# copy of this software and associated documentation files (the "Software"),
# to deal in the Software without restriction, including without limitation
# the rights to use, copy, modify, merge, publish, distribute, sublicense,
# and/or sell copies of the Software, and to permit persons to whom the
# Software is furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
# THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
# OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
# ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
# OTHER DEALINGS IN THE SOFTWARE.

set -e

REPOSITORY="/var/opt/amdgpu-pro-local"

usage() {
	cat <<END_USAGE
Usage: $PROG [options...]

Options:
  -h|--help  display this help message
  --px       PX platform support
  --compute  OpenCL support only

  Unless the -h|--help option is given, 'apt-get' options may be present.

END_USAGE
}

function stderr() {
	cat - 1>&2
}

function os_release() {
	[[ -r  /etc/os-release ]] && . /etc/os-release

	case "$ID" in
	debian)
		PACKAGES="amdgpu-pro amdgpu-pro-lib32 amdgpu-pro-dkms"
		;;
	steamos)
		PACKAGES="amdgpu-pro-driver amdgpu-pro-lib32 "`
			`"glx-alternative-amdgpu-pro amdgpu-pro-dkms"
		;;
	*)
		echo "Unsupported OS" | stderr
		exit 1
		;;
	esac
}

function source_list() {
	local dir etc sourceparts

	eval $(apt-config shell dir Dir)
	eval $(apt-config shell etc Dir::Etc)
	eval $(apt-config shell sourceparts Dir::Etc::sourceparts)

	echo ${dir%/}/${etc%/}/${sourceparts%/}/amdgpu-pro.list
}

function amdgpu_pro_install() {
	local src=$(cd ${0%/*} && pwd -P)
	local index="$src/Packages"

	amdgpu_pro_uninstall "$@"

	if [[ -r "$index" ]]; then
		$SUDO mkdir -p $REPOSITORY && $SUDO cp -af "$src"/* $_
		$SUDO ln -s $_/$PROG $SBIN/${PROG%-*}-uninstall

		echo "deb [ trusted=yes ] file:$REPOSITORY/ ./" | \
			$SUDO tee $(source_list)
		$SUDO apt-get update ||:
		$SUDO apt-get "$@" install $PACKAGES
	fi
}

function amdgpu_pro_uninstall() {
	local p
	local installed=()

	[[ -r "$(source_list)" ]] || return 0

	for p in $(cat $REPOSITORY/Packages | awk '{
		if ($1 == "Package:")
			p = $2;
		else if ($1 == "Architecture:")
			print p ":" $2
	}')
	do
		if dpkg -s $p >/dev/null 2>&1; then
			installed+=($p)
		fi
	done

	if [[ ${#installed[@]} -ne 0 ]]; then
		$SUDO apt-get "$@" remove --purge ${installed[@]}
	fi

	$SUDO rm -rf $SBIN/${PROG%-*}-uninstall $(source_list) $REPOSITORY
	$SUDO apt-get update ||:
}

PROG=${0##*/}
SUDO=$([[ $(id -u) -ne 0 ]] && echo "sudo" ||:)
SBIN="/usr/bin"
os_release

while (($#))
do
	case "$1" in
	-h|--help)
		usage
		exit 0
		;;
	--px)
		PACKAGES="$PACKAGES xserver-xorg-video-modesetting-amdgpu-pro"
		shift
		;;
	--compute)
		PACKAGES="clinfo-amdgpu-pro opencl-amdgpu-pro-icd \
			amdgpu-pro-dkms libdrm2-amdgpu-pro \
			libdrm-amdgpu-pro-amdgpu1"
		shift
		;;
	*)
		ARGS+="$1 "
		shift
		;;
	esac
done

set -- $ARGS
amdgpu_pro_${0##*-} "$@"