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#!/bin/sh
#
# Copyright (C) 2017 Wolfgang Wiedmeyer <wolfgit@wiedmeyer.de>
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.

set -e

DEVICE=$1
FW_FUNC=$2
ACTION=$3
FW_HOST="https://github.com"
ADB="adb"

get_files () {
	fw_file=$1

	mkdir -p "$DEVICE-fw"

	cat "$DEVICE-fwinfo/$fw_file.txt" | while read file
	do
		link=${file%:*}

		wget "$FW_HOST/$link" -O "$DEVICE-fw/"$( basename $file )
	done
}

find_files () {
	fw_file=$1

	cat "$DEVICE-fwinfo/$fw_file.txt" | while read file
	do
		path="$DEVICE-fw/"$( basename $file )

		if [ ! -f "$path" ]
		then
			echo "$path missing, downloading..."
			get_files $fw_file
			break
		fi
	done
}

prepare_adb () {
	echo -n "Using "
	$ADB version
	$ADB root
	sleep 3
	$ADB remount
}

push_files () {
	fw_file=$1

	cat "$DEVICE-fwinfo/$fw_file.txt" | while read file_string
	do
		file="${file_string#*:}"
		echo "Pushing $file"

		path="$DEVICE-fw/"$( basename $file )
		$ADB push "$path" "$file"
	done
}

remove_files () {
	fw_file=$1

	cat "$DEVICE-fwinfo/$fw_file.txt" | while read file
	do
		path="${file#*:}"
		echo "Removing $path"
		$ADB shell rm -f "$path"
	done
}

list_func () {
	echo "The following functionalities can be enabled:"
	for file in "$DEVICE-fwinfo/"*.txt
	do
		echo $( basename $file .txt )
	done
	exit 0
}

eval_fw_func () {
	command=$1

	case "$FW_FUNC" in
		"all")
			for file in "$DEVICE-fwinfo/"*.txt
			do
				$command $( basename $file .txt )
			done
			;;
		*)
			$command $FW_FUNC
			;;
	esac
}

if [ "$DEVICE" = "" ] || [ "$FW_FUNC" = "" ]
then
	echo "Usage: $0 [DEVICE] [FUNCTIONALITY]"
	echo "       $0 [DEVICE] [FUNCTIONALITY] remove"
	echo
	echo "Run \"$0 [DEVICE] list\" to get a list of functionalities that can be enabled"
	echo "or specify \"all\" to enable/remove all supported functionalities"
	echo
	exit 1
fi

if [ ! -d "$DEVICE-fwinfo" ]
then
	echo "$DEVICE is not supported"
	echo "The following devices are supported:"
	for dir in *-fwinfo
	do
		echo "${dir%-fwinfo}"
	done
	exit 1
fi

if [ "$FW_FUNC" = "list" ]
then
	list_func
fi

if [ "$FW_FUNC" != "all" ] && [ ! -f "$DEVICE-fwinfo/$FW_FUNC.txt" ]
then
	echo "$FW_FUNC is not a functionality that can be enabled"
	echo
	list_func
fi

case "$ACTION" in
	"remove")
		prepare_adb
		eval_fw_func remove_files
		;;
	*)
		eval_fw_func find_files
		prepare_adb
		$ADB shell mkdir -p /system/vendor/firmware
		eval_fw_func push_files
		;;
esac

echo "rebooting the device"
$ADB reboot
echo "finished successfully"