#!/bin/bash

# Copyright 2020 Midgard
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.


# Configure me
SSHARGS="myserver.example.org"
SYMBOLS="USD GBP"
SERVERSIDE_PATH_TO_RATES="/usr/local/lib/pricedb/rates"


set -euo pipefail

pricedb="$HOME/ledger/pricedb.ledger"
cd "$(dirname "$pricedb")"

last_date="$(tail -n1 "$pricedb" | sed 's/P \([0-9 :-]*\) .*/\1/')"
printf 'Fetching all exchange rates after %s\n' "$last_date"

values="$(ssh $SSHARGS "$SERVERSIDE_PATH_TO_RATES '$last_date' $SYMBOLS")"
if [ $? -eq 0 -a -n "$values" ]; then
	printf '%s\n' "$values" >> "$pricedb"
	printf '%s\n' "$values"
fi

git diff --quiet "$pricedb" && exit
git diff --cached --quiet || { echo "Not adding to Git because there are staged changes"; exit; }
git add "$pricedb"
git commit -m "Update pricedb"