#!/bin/bash

if [ $# -ne 0 ]
then
        echo "usage $(basename $0)"
        exit 1
fi

function get_latest_release() {
  curl --silent "https://api.github.com/repos/$1/releases/latest" | # Get latest release from GitHub api
    grep '"tag_name":' |                                            # Get tag line
    sed -E 's/.*"([^"]+)".*/\1/'                                    # Pluck JSON value
}

version=$(get_latest_release vector-im/element-web)
echo "Debut de l installation de Element $version"

printf "Nettoyage et sauvegarde"
rm -rf element-v*
printf "."
rm -rf riot_old
printf "."
cp -Rp riot/ riot_old
printf ". OK!\n"

printf "Recuperation element.."
wget https://github.com/vector-im/element-web/releases/download/${version}/element-${version}.tar.gz 1>/dev/null 2>/dev/null
ret=$?
printf ". OK!\n"

if [ $ret -eq 0 ]
then
        printf "Installation."
        tar xzf element-${version}.tar.gz
        printf "."
        cp -Rp element-${version}/* riot/
        printf "."
        chown -R www-data:www-data riot
        printf ". OK!\nInstallation finie.\n"
        exit 0
else
        echo "Recuperation impossible, arret"
        exit 2
fi