package storage

import (
	"encoding/json"

	"git.maze.io/maze/conduit/storage/codec"
)

// KV implements a key-value store.
type KV interface {
	// Has checks if the key is present.
	Has(key string) bool

	// Get a value by key.
	Get(key string) (value []byte, ok bool)
}

// WritableKV can store key-value items.
type WritableKV interface {
	KV

	// Close the key-value storage.
	Close() error

	// DeleteKey removes a key.
	Delete(key string) error

	// Set a value by key.
	Set(key string, value []byte) error
}

type EncodedKV interface {
	Has(key string) bool
	Get(key string, value any) (ok bool, err error)
}

type EncodedWritableKV interface {
	EncodedKV

	Close() error

	Delete(key string) error

	Set(key string, value []byte) error
}

type encodedKV struct {
	kv     KV
	encode func(any) ([]byte, error)
	decode func([]byte, any) error
}

func (kv encodedKV) Has(key)

func NewEncodedKV(kv KV, codec codec.Codec) EncodedKV {
	return &encodedKV{
		kv:     kv,
		encode: json.Marshal,
		decode: json.Unmarshal,
	}
}