package bus

import (
	"context"
	"strings"

	"github.com/pkg/errors"
)

type (
	MessageNamespace string
	Address          string
	Message          any
)

type Envelope interface {
	Message() any
	Context() context.Context
	Address() Address
}

type BaseEnvelope struct {
	msg  Message
	ctx  context.Context
	addr Address
}

func NewEnvelope(ctx context.Context, addr Address, msg Message) *BaseEnvelope {
	return &BaseEnvelope{
		ctx:  ctx,
		addr: addr,
		msg:  msg,
	}
}

func NewMessageNamespace(namespaces ...MessageNamespace) MessageNamespace {
	var sb strings.Builder

	for i, ns := range namespaces {
		if i != 0 {
			if _, err := sb.WriteString(":"); err != nil {
				panic(errors.Wrap(err, "could not build new message namespace"))
			}
		}

		if _, err := sb.WriteString(string(ns)); err != nil {
			panic(errors.Wrap(err, "could not build new message namespace"))
		}
	}

	return MessageNamespace(sb.String())
}