#!/bin/bash
set -e

# check dependencies
count=0
for dependency in grep cut sort tail sed; do
	if [ ! -x "$(command -v $dependency)" ]; then
		echo "$dependency missing"
		count=$((count+1))
	fi
done

# exit script if any dependencies missing
if [ $count -ne 0 ]; then
	exit 1
fi

# options to pass to cURL, including custom user agent
USER_AGENT="nightly-version-checker/1.0 george@rawlinson.net.nz"
CURL_OPTS=(--silent --user-agent "$USER_AGENT")

# package variables
_name=firefox
_channel=nightly
_lang="en-GB"
CARCH=x86_64
_base_url="https://ftp.mozilla.org/pub/${_name}/${_channel}"

_version=$(curl "${CURL_OPTS[@]}" ${_base_url}/latest-mozilla-central-l10n/ | grep "${_lang}.linux-${CARCH}.checksums" | sed "s/^.*>firefox-//; s/\.${_lang}.*//" | sort -n | tail -n 1)
_build_id_raw="$(curl "${CURL_OPTS[@]}" "${_base_url}/latest-mozilla-central-l10n/${_name}-${_version}.${_lang}.linux-${CARCH}.checksums" | grep '.partial.mar' | cut -d' ' -f4 | grep -E -o '[[:digit:]]{14}' | sort | tail -n1)"
declare -A _build_id
_build_id=(
	[year]="${_build_id_raw:0:4}"
	[month]="${_build_id_raw:4:2}"
	[day]="${_build_id_raw:6:2}"
	[hour]="${_build_id_raw:8:2}"
	[min]="${_build_id_raw:10:2}"
	[sec]="${_build_id_raw:12:2}"
	[date]="${_build_id_raw:0:8}"
	[time]="${_build_id_raw:8:6}"
)

echo "${_version}.${_build_id[date]}.${_build_id[time]}"

exit 0