package stdio

import (
	"encoding/json"
	"fmt"
	"strings"
	"time"
)

// busStateCalls are the method prefixes of the calls a bundle makes on its own bus state through the runtime (novox/hq
// ADR 0595 §9, design 25 § 12.5): their shapes and names are package buscalls's, and package busstate the typed way
// to make them.
var busStateCalls = []string{"mesh/objects.", "mesh/stream.", "mesh/workqueue.", "mesh/ledger."}

// BusState asks the runtime one call on this bundle's own bus state, an entry its module asks for in `requires`, named
// by its local name in params; the runtime serves it from the module's own bindings only. A method that is none of
// those calls is refused here, before the runtime is asked.
func BusState(method string, params any) (json.RawMessage, error) {
	known := false
	for _, p := range busStateCalls {
		known = known || strings.HasPrefix(method, p)
	}
	if !known {
		return nil, fmt.Errorf("%s is no call on a bundle's own bus state (%s)", method, strings.Join(busStateCalls, ", "))
	}
	c, err := live()
	if err != nil {
		return nil, err
	}
	return c.ask(method, params, 60*time.Second)
}