#!/bin/bash
set -eu
{{/* This script pulls down the OpenVPN-Config.ovpn file. It will do so once per week. */ -}}

FILE=~/.config/ovpn/Local.ovpn
ONE_WEEK=604800

function displaytime {
    local T=$1
    local D=$((T / 60 / 60 / 24))
    local H=$((T / 60 / 60 % 24))
    local M=$((T / 60 % 60))
    local S=$((T % 60))
    (($D > 0)) && printf '%d days ' $D
    (($H > 0)) && printf '%d hours ' $H
    (($M > 0)) && printf '%d minutes ' $M
    (($D > 0 || $H > 0 || $M > 0)) && printf 'and '
    printf '%d seconds\n' $S
}

download() {
    echo "Downloading OpenVPN-Config.ovpn"
    TEMP_FILE=$(mktemp)
    if bw get attachment 'OpenVPN-Config.ovpn' --itemid eca96b94-ee35-4aa8-a58f-b21e016c94a3 --output "$TEMP_FILE"; then
        mv "$TEMP_FILE" "$FILE"
    else
        echo "Failed to download OpenVPN-Config.ovpn"
    fi
}

# Check if file exists
if [ -f "$FILE" ]; then
    FILE_ABSOLUTE=$(realpath "$FILE")
    RELATIVE_SECONDS=$(expr $EPOCHSECONDS - $(stat -c %Y -- "$FILE_ABSOLUTE"))

    echo "File exists, last downloaded $(displaytime $RELATIVE_SECONDS) ago"
    if ! test "$RELATIVE_SECONDS" -lt $ONE_WEEK; then
        echo "File is older than a week, redownloading (last downloaded $(displaytime $RELATIVE_SECONDS) ago)"
        download
    fi
else
    download
fi