package cluster

import (
	"context"
	"errors"

	"git.giftfish.de/ston1th/haproxy-lb/pkg/config"
	"github.com/go-logr/logr"
)

var (
	ErrNotLeader      = errors.New("not leader")
	ErrKeyNotFound    = errors.New("key not found")
	ErrPrefixNotFound = errors.New("prefix not found")
)

type Cluster interface {
	Start(*config.Config) error
	SetCallbacks(Callbacks) error
	Stepdown()
	Stop()
}

type KV interface {
	Get(k string) ([]byte, error)
	GetPrefix(k string) (map[string][]byte, error)
	Set(k string, v []byte) error
	Delete(k string) error
}

type CallbackContext interface {
	logr.Logger
	KV
	ID() string
	Fatal(error)
}

type Callbacks struct {
	Leader   func(context.Context, CallbackContext)
	Follower func(context.Context, CallbackContext)
	Cleanup  func(context.Context, CallbackContext)
}