#!/bin/sh

EXEC_NAME="$(basename "$0")"
EXTENSION="$1"

usage() {
	cat << EOF
usage: $EXEC_NAME [EXT]

examples:
	cd Decsync/calendars/$(uuidgen)/v2/DeviceName-DecSyncCC-$RANDOM ; $EXEC_NAME ics

	cd Decsync/contacts/$(uuidgen)/v2/DeviceName-DecSyncCC-$RANDOM ; $EXEC_NAME vcf

$EXEC_NAME will attempt to guess the appropriate file extension based on the parent folder names. the first parent folder that matches exactly one of the following determines the file extension:
	calendars  ->  .ics
	contacts   ->  .vcf
	tasks      ->  .ics

if no file extension is found and none is explicitly provided, $EXEC_NAME will exit.
EOF
}

if [ "$1" = "-h" ] || [ "$1" = "--help" ] ; then
	usage
	exit 0
fi

if [ ! -e sequences ] ; then
	echo "error: could not find decsync sequences file"
	exit 1
fi

# auto detect extension if not explicitly provided
if [ -z "$EXTENSION" ] ; then
	EXTENSION="$(realpath "$PWD" | tr '/' '\n' | tac | while read -r folder ; do
		case "$folder" in
			calendars|tasks) echo ics ; break ;;
			contacts) echo vcf ; break ;;
		esac
	done)"
fi

if [ -z "$EXTENSION" ] ; then
	echo "error: could not detect EXT"
	exit 1
fi

COLLECTION_PREFIX="$(jq --raw-output 'if .[2] == "name" then "\(.[3])/" else empty end' info)"
mkdir -p "$COLLECTION_PREFIX"

jq --raw-output '. | keys | join("\n")' sequences |\
	sed '/^info$/d' |\
	tr '\n' '\0' |\
	xargs -0 -n1 cat |\
while read -r line ; do
	filename="$COLLECTION_PREFIX$(echo "$line" | jq --raw-output '.[0][1]').$EXTENSION"
	echo "$filename"
	echo "$line" | jq --raw-output '.[3]' > "$filename"
done