#!/bin/bash

DISTRIB=xenial

LAST_VERSION=`curl -s https://updates.signal.org/desktop/apt/dists/$DISTRIB/main/binary-amd64/Packages | grep ^Version: | grep -v beta | awk '{print $2}' | sort -V -r | head -n1`
if [ -z $LAST_VERSION ]; then
    echo "No version found"
    exit 1
fi

CURRENT_VERSION=`rpm -q --qf "%{VERSION}\n" signal-desktop`
if [ $? -ne 0 ]; then
    CURRENT_VERSION=0.0.0
fi

echo Current version: $CURRENT_VERSION
echo Available version: $LAST_VERSION

if [[ $CURRENT_VERSION = $LAST_VERSION ]]; then
    echo Up to date
    exit 0
fi

TMP_DIR=/tmp/signal-desktop_${LAST_VERSION}_amd64
TMP_FILE=${TMP_DIR}.deb
WORK_DIR=$TMP_DIR/signal-desktop-${LAST_VERSION}

echo Temporary file: $TMP_FILE
echo Temporary directory: $TMP_DIR
echo RPM working directory: $WORK_DIR

mkdir -p $TMP_DIR
test -f $TMP_FILE || curl https://updates.signal.org/desktop/apt/pool/main/s/signal-desktop/signal-desktop_${LAST_VERSION}_amd64.deb -s -o $TMP_FILE

test -d $WORK_DIR || (cd $TMP_DIR && sudo alien -r -g $TMP_FILE)
if [ $? -ne 0 ]; then
    exit 1
fi

sudo sed -i 's/^Summary: $/Summary: signal-desktop/' $TMP_DIR/signal-desktop-${LAST_VERSION}/signal-desktop-${LAST_VERSION}-2.spec
(cd $TMP_DIR && sudo rpmbuild --buildroot $WORK_DIR -bb $WORK_DIR/signal-desktop-${LAST_VERSION}-2.spec && sudo dnf install ../signal-desktop-${LAST_VERSION}-2.x86_64.rpm)
if [ $? -ne 0 ]; then
    exit 1
fi

rm $TMP_FILE
sudo rm -R $TMP_DIR
exit 0