#!/bin/bash

########################################################################
# A shell script to install / upgrade SimpleHelp on a Linux system.
#
# Configure the installation directory below. This script will always
# download the latest public release of SimpleHelp. If an existing
# installation is detected
########################################################################

# Installation directory
install="/opt/SimpleHelp"
if [ ! -z "$1" ]; then
    install="$1"
fi

# Check permissions
parentdir="$(dirname "$install")"
if [ ! -w "$parentdir" ]; then
    echo "[ERROR] Insufficient permissions to write installation files in $parentdir" >&2
    exit 1
fi
if [ -d "$install" ]; then
    if [ ! -w "$parentdir" ]; then
        echo "[ERROR] Insufficient permissions to write installation files in $install" >&2
        exit 1
    fi
fi

echo "--- Managing SimpleHelp installation in $install"

# Generate a timestamp
now=$(date +"%Y%m%d_%H%M%S")

# Keep track of the initial directory
initial_dir="$PWD"

# Stop the server
if [ -d "$install" ]; then
    echo "--- Stopping SimpleHelp installation in $install"
    cd "$install"
    sh serverstop.sh >/dev/null 2>&1
    sleep 10
    cd ..
    echo "--- Backing up the SimpleHelp installation to SimpleHelp_backup_$now"
    mv "$install" "SimpleHelp_backup_$now"
fi

# Fetch the new version
echo "--- Downloading the latest version"
uname_out=`uname -m`
case "$uname_out" in
    *aarch64*|*arm64*)
        echo "--- Using the Linux ARM 64bit Release"
        sh_binary="SimpleHelp-linux-arm64.tar.gz"
        sh_url="https://simple-help.com/releases/SimpleHelp-linux-arm64.tar.gz"
    ;;
    *aarch*|*arm*)
        echo "--- Using the Linux ARM 32bit Release"
        sh_binary="SimpleHelp-linux-arm32.tar.gz"
        sh_url="https://simple-help.com/releases/SimpleHelp-linux-arm32.tar.gz"
    ;;
    *64*)
        echo "--- Using the Linux Intel 64bit Release"
        sh_binary="SimpleHelp-linux-amd64.tar.gz"
        sh_url="https://simple-help.com/releases/SimpleHelp-linux-amd64.tar.gz"
    ;;
    *)
        echo "--- Using the Linux Intel 32bit Release"
        sh_binary="SimpleHelp-linux.tar.gz"
        sh_url="https://simple-help.com/releases/SimpleHelp-linux.tar.gz"
    ;;
esac

rm -f $sh_binary
echo "--- Downloading..."
wget -q $sh_url
echo "--- Extracting..."
tar -xzf $sh_binary

if [ "$install" != "$PWD/SimpleHelp" ]; then
    echo "--- Moving install to $install"
    mv SimpleHelp "$install"
fi

# Copy across the old configuration folder
if [ -d "SimpleHelp_backup_$now" ]; then
    echo "--- Copying across configuration files"
    cp -R $install/../SimpleHelp_backup_$now/configuration/* $install/configuration
fi

# Start the new server
echo "--- Starting your new SimpleHelp server"
cd "$install"
sh serverstart.sh
cd $initial_dir