#!/bin/bash
#
# Manage list of deployed version numbers for a channel in order to generate incremental builds
#
set -euo pipefail

SCRIPT_DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )"
ROOT_DIR="$(dirname "$SCRIPT_DIR")"
. "$ROOT_DIR/config.sh"

function usage {
	cat >&2 <<DONE
Usage:
 -c CHANNEL            Release channel (e.g., 'beta'); defaults to 'release'
 -p PLATFORM           Platform (m=Mac, w=Windows, l=Linux)
 -a VERSION            Add version to incrementals list; cannot be used with -n
 -n NUM_VERSIONS       Number of previous versions to return; cannot be used with -a
DONE
	exit 1
}

CHANNEL="release"
PLATFORM=""
VERSION=""
NUM_VERSIONS=""
while getopts "c:p:a:n:" opt; do
	case $opt in
		c)
			CHANNEL="$OPTARG"
			;;
		p)
			case "$OPTARG" in
				m) PLATFORM=mac;;
				w) PLATFORM=win;;
				l) PLATFORM=linux;;
				*)
					echo "$0: Invalid platform option $OPTARG"
					usage
					;;
			esac
			;;
		a)
			VERSION="$OPTARG"
			;;
		n)
			NUM_VERSIONS="$OPTARG"
			;;
		*)
			usage
			;;
	esac
	shift $((OPTIND-1)); OPTIND=1
done

if [[ -z "$PLATFORM" ]]; then
	usage
fi

if [[ -z "$VERSION" ]] && [[ -z "$NUM_VERSIONS" ]]; then
	usage
fi

if [[ "$VERSION" ]] && [[ "$NUM_VERSIONS" ]]; then
	usage
fi

INCR_FILENAME="incrementals-$CHANNEL-$PLATFORM"
S3_URL="s3://$S3_BUCKET/$S3_DIST_PATH/$CHANNEL/incrementals-$PLATFORM"
INCR_PATH="$DIST_DIR/$INCR_FILENAME"

mkdir -p "$DIST_DIR"
aws s3 cp $S3_URL $INCR_PATH >&2

# Add version to file and reupload
if [ "$VERSION" ]; then
	echo "Adding $VERSION to incrementals-$PLATFORM"
	echo $VERSION >> $INCR_PATH
	aws s3 cp $INCR_PATH $S3_URL
# Show last n versions
elif [ "$NUM_VERSIONS" ]; then
	tail -n $NUM_VERSIONS $INCR_PATH
fi
rm $INCR_PATH