#!/usr/bin/env bash

HOSTS="$1"
ROLE_LIST=( "virt-common" "docker" "apps" "postgresql" "proxy" )

# Dynamically remove roles that are incompatible with a host
OLDIFS="$IFS"
IFS=:
for target in $HOSTS; do
    case $target in
    *app*)
        ROLE_LIST=( "${ROLE_LIST[@]/postgresql}" )
        ROLE_LIST=( "${ROLE_LIST[@]/proxy}" )
        ;;
    *db*)
        ROLE_LIST=( "${ROLE_LIST[@]/docker}" )
        ROLE_LIST=( "${ROLE_LIST[@]/apps}" )
        ROLE_LIST=( "${ROLE_LIST[@]/proxy}" )
        ;;
    *mda*|media*)
        ROLE_LIST=( "${ROLE_LIST[@]/apps}" )
        ROLE_LIST=( "${ROLE_LIST[@]/postgresql}" )
        ROLE_LIST=( "${ROLE_LIST[@]/proxy}" )
        ;;
    *prx*|proxy*)
        ROLE_LIST=( "${ROLE_LIST[@]/apps}" )
        ROLE_LIST=( "${ROLE_LIST[@]/postgresql}" )
        ;;
    *)
        ROLE_LIST=( "virt-common" ) ;;
    esac
done
IFS="$OLDIFS"

# Transform role list into JSON array
ROLES="$(jq -c -M -n '$ARGS.positional | map(select(length > 0))' --args -- "${ROLE_LIST[@]}")"
echo "Running roles $ROLES against $HOSTS"

# Export vars for envsubst
export HOSTS
export ROLES

# Execution of temporary envsubst'ed playbook
PLAYBOOK="playbook-$(tr -dc A-Za-z < /dev/urandom | head -c 10).yml"
envsubst < site.yml > "$PLAYBOOK"
ansible-playbook "$PLAYBOOK"
STATUS=$?

# Clean up temporary playbook
rm -f "$PLAYBOOK"
exit $STATUS