#!/bin/bash

#  ge-tool
#  
#  Copyright 2021 crt0mega <crt0mega@c-r-t.tk>
#  
#  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 2 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, write to the Free Software
#  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
#  MA 02110-1301, USA.
#  
#  

# Configuration

declare CONFIG_DIR="$HOME/.config/ge-tool"
declare CONFIG_FILE="$CONFIG_DIR/config"
declare LATEST_FILE="$CONFIG_DIR/latest"
declare API_CACHE=$(mktemp)

if [ ! -d "$CONFIG_DIR" ]; then
	
	# Create config dir if it doesn't exist
	
	mkdir -p $CONFIG_DIR

fi

if [ ! -f "$CONFIG_FILE" ]; then

	# Default values
	
	declare COMPAT_DIR="$HOME/.steam/root/compatibilitytools.d"
	declare REL_URL="https://api.github.com/repos/GloriousEggroll/proton-ge-custom/releases"
	declare GITHUB_TOKEN=""

else

	# Read config instead
	
	source $CONFIG_FILE > /dev/null

fi

if [ ! $GITHUB_TOKEN=="" ]; then
	
	# Have token, give token
	
	declare CURL_ARGS="-H 'Authorization: token $GITHUB_TOKEN'"
	
else

	# Have no token, give no token
	
	declare CURL_ARGS=""
	
fi

# Checking requirements

declare JQ=$(which jq)
declare CURL=$(which curl)
declare ZEN=$(which zenity)
declare NTFY=$(which notify-send)
declare ERR="0"

if [ "$JQ" == "" ]; then
	echo "Error: jq not installed."
	ERR="1"
fi

if [ "$CURL" == "" ]; then
	echo "Error: curl not installed."
	ERR="2"
fi

if [ "$ZEN" == "" ]; then
	echo "Error: zenity not installed."
	ERR="3"
fi

if [ "$NTFY" == "" ]; then
	echo "Error: libnotify-bin not installed."
	ERR="4"
fi

if [ ! "$ERR" == "0" ]; then exit; fi

# Caching latest release

$CURL $CURL_ARGS -sL $REL_URL/latest > $API_CACHE

# Getting tag-name of latest git release

declare LATEST_REMOTE_REL=$($JQ -r '.tag_name' < $API_CACHE)

# Getting tag-name of latest local copy

if [ -f "$LATEST_FILE" ]; then
	
	declare LATEST_LOCAL_REL=$(<$LATEST_FILE)

else
	
	declare LATEST_LOCAL_REL="null"
	
fi

# Compare with latest local release

if [ "$LATEST_LOCAL_REL" == "$LATEST_REMOTE_REL" ]; then

	$ZEN --info --no-wrap \
	 --text="Your local copy of proton-ge-custom is up to date!\nLatest git release: $LATEST_REMOTE_REL"
	exit

else
	
	if ! $ZEN --question --no-wrap \
	 --text="A newer release of proton-ge-custom is available!\nLatest local release: $LATEST_LOCAL_REL\n\
Latest git release: $LATEST_REMOTE_REL\n\
Do you want to download it?"; then
		exit
	fi
		
fi

# Get download URLs if local release is outdated

# Download now, verify later :D
# declare DOWNLOAD_SHA512_URL=$($JQ -r '.assets[0].browser_download_url' < $API_CACHE)
declare DOWNLOAD_TARBALL_URL=$($JQ -r '.assets[1].browser_download_url' < $API_CACHE)
declare DOWNLOAD_TARBALL_FILE=$($JQ -r '.assets[1].name' < $API_CACHE)
declare DOWNLOAD_DIR=$(mktemp -d)

$NTFY "Downloading $DOWNLOAD_TARBALL_FILE"

$CURL $DOWNLOAD_TARBALL_URL -o $DOWNLOAD_DIR/$DOWNLOAD_TARBALL_FILE -sL

$NTFY "Download completed, extracting ..."

# Extracting downloaded Proton release

if [ ! -d $COMPAT_DIR ]; then mkdir -p $COMPAT_DIR; fi
tar xf $DOWNLOAD_DIR/$DOWNLOAD_TARBALL_FILE -C $COMPAT_DIR

# Setting info for latest release

echo "$LATEST_REMOTE_REL" > $LATEST_FILE

# Cleaning up

rm -r $DOWNLOAD_DIR
rm $API_CACHE

$NTFY "Installation complete."