#! /usr/bin/env bash

set -e

readonly ARGS="$#"
readonly SERVICE="$1"
readonly SERVICE_PLAN="$2"
readonly SERVICE_INSTANCE="$3"
readonly SERVICE_CREDENTIALS_JSON="$4"
readonly PROGNAME=$(basename $0)

usage() {
	cat <<- EOF
	usage: $PROGNAME service-name service-plan service-instance

	Program creates a clound foundry service in the currently selected space
	if necessary.  If a service already exists with the given instance name,
	then the service will be updated to use the new plan.  Note, will not try
	to chang the service broker.

	Examples:
	   Create a mysql database using the 512mb plan named bet-mysql:
	   $PROGNAME p-mysql 512mb bet-mysql
	EOF
}

array_contains () {
	local seeking=$1; shift
	local in=false
	for element; do
		if [[ $element == $seeking ]]; then
			in=true
			break
		fi
	done
	echo $in
}

does_service_exist() {
	local services=$(cf services | awk '{print $1}' | tail -n +4)
	echo $(array_contains $SERVICE_INSTANCE $services)
}

main() {
    if [ $ARGS -gt 4 ] || [ $ARGS -lt 3 ]; then
        usage
        return 1
    fi
	if [ "$(does_service_exist $SERVICE_INSTANCE)" = false ]; then
		echo "Creating Service..."
		if [ -z "$SERVICE_CREDENTIALS_JSON" ]; then
		    cf create-service $SERVICE $SERVICE_PLAN $SERVICE_INSTANCE
		else
		    cf create-service $SERVICE $SERVICE_PLAN $SERVICE_INSTANCE -c "$SERVICE_CREDENTIALS_JSON"
		fi
	else
		echo "Service $SERVICE_INSTANCE Already Exists, Updating..."
		if [ -z "$SERVICE_CREDENTIALS_JSON" ]; then
		    cf update-service $SERVICE_INSTANCE -p $SERVICE_PLAN
        else
		    cf update-service $SERVICE_INSTANCE -p $SERVICE_PLAN -c "$SERVICE_CREDENTIALS_JSON"
		fi
	fi
}

main