package state

import (
	"encoding/json"
	"errors"
)

type uniqueList struct {
	store    StateStore
	storeKey string
	data     map[string][]byte
}

func NewUniqueList(store StateStore, storeKey string) uniqueList {
	l := uniqueList{store: store}
	l.data = make(map[string][]byte)
	l.storeKey = storeKey

	return l
}

func (l *uniqueList) persist() error {
	err := l.store.StoreState(l.storeKey, l.data)
	return err
}

func (l *uniqueList) AddItem(key string, item any) error {
	data, err := json.Marshal(item)
	if err != nil {
		return err
	}

	l.data[key] = data
	err = l.persist()
	if err != nil {
		return err
	}

	return nil
}

func (l *uniqueList) ItemExists(key string) (bool, error) {
	_, ok := l.data[key]
	return ok, nil
}

func (l *uniqueList) GetItem(key string, item any) error {
	data, ok := l.data[key]
	if !ok {
		return errors.New("Item not found")
	}

	err := json.Unmarshal(data, item)
	return err
}

func (l *uniqueList) GetKeys() []string {
	keys := make([]string, len(l.data))

	i := 0
	for k := range l.data {
		keys[i] = k
		i++
	}

	return keys
}