# Engine API 1. Selection is an allowlist of packaged implementations, never a
# filename, shell fragment or a plugin downloaded from cluster configuration.
mc_engine_load()
{
    local plugin hook
    if [ "${OCF_RESKEY_application:-postgresql}" != postgresql ] ||
       [ "${OCF_RESKEY_container_runtime:-podman}" != podman ] ||
       [ "${OCF_RESKEY_lifecycle_manager:-systemd}" != systemd ]; then
        ocf_exit_reason "Supported plugin combination: application=postgresql container_runtime=podman lifecycle_manager=systemd"
        return "${OCF_ERR_CONFIGURED}"
    fi

    unset MC_RUNTIME_API MC_LIFECYCLE_API MC_APPLICATION_API
    for plugin in runtimes/podman lifecycles/systemd applications/postgresql/plugin; do
        if ! . "${MC_MODULE_DIR}/${plugin}.sh"; then
            ocf_exit_reason "Unable to load resource-agent module ${MC_MODULE_DIR}/${plugin}.sh"
            return "${OCF_ERR_CONFIGURED}"
        fi
    done
    if [ "${MC_RUNTIME_API:-}" != 1 ] || [ "${MC_LIFECYCLE_API:-}" != 1 ] ||
       [ "${MC_APPLICATION_API:-}" != 1 ]; then
        ocf_exit_reason "Incompatible plugin interface; API 1 required"
        return "${OCF_ERR_CONFIGURED}"
    fi
    for hook in mc_runtime_exec mc_runtime_exec_bounded mc_runtime_inspect mc_runtime_info \
                mc_lifecycle_start mc_lifecycle_stop mc_lifecycle_running mc_lifecycle_cat \
                mc_application_monitor mc_application_standby_score mc_application_validate \
                mc_application_metadata mc_application_notify mc_application_action; do
        if ! declare -F "${hook}" >/dev/null; then
            ocf_exit_reason "Required plugin hook is missing: ${hook}"
            return "${OCF_ERR_CONFIGURED}"
        fi
    done
}

mc_engine_metadata()
{
    # Metadata discovery works without configured resource instance attributes.
    # Capture the plugin's status before transforming XML; avoid a pipeline
    # masking a metadata failure. No runtime/service/cluster access is required.
    local metadata
    metadata="$(mc_application_metadata)" || return "$?"
    printf '%s\n' "${metadata}" | sed '/<\/parameters>/i\
    <parameter name="application" unique="0" required="0">\
      <longdesc lang="en">Packaged application plugin. Only postgresql is supported.</longdesc>\
      <shortdesc lang="en">Application plugin</shortdesc>\
      <content type="string" default="postgresql"/>\
    </parameter>\
    <parameter name="container_runtime" unique="0" required="0">\
      <longdesc lang="en">Packaged runtime adapter. Only podman is supported.</longdesc>\
      <shortdesc lang="en">Container runtime</shortdesc>\
      <content type="string" default="podman"/>\
    </parameter>\
    <parameter name="lifecycle_manager" unique="0" required="0">\
      <longdesc lang="en">Container lifecycle owner. Only systemd with the existing user service is supported.</longdesc>\
      <shortdesc lang="en">Lifecycle manager</shortdesc>\
      <content type="string" default="systemd"/>\
    </parameter>'
}