package chain

import (
	"crypto/ed25519"
	"encoding/hex"
	"maps"
	"strconv"
)

type CoinID struct {
	TxHash string
	Index  int
}

func (id CoinID) Key() string { return id.TxHash + ":" + strconv.Itoa(id.Index) }

type Coin struct {
	Amount int
	Owner  ed25519.PublicKey
}

func (c Coin) OwnerHex() string { return hex.EncodeToString(c.Owner) }

type UnspentCoin struct {
	Coin
	CoinID CoinID
}

type CoinStore map[string]*UnspentCoin

func (s CoinStore) Add(txHash string, idx int, coin Coin) {
	id := CoinID{TxHash: txHash, Index: idx}
	s[id.Key()] = &UnspentCoin{Coin: coin, CoinID: id}
}

func (s CoinStore) Spend(id CoinID) { delete(s, id.Key()) }

func (s CoinStore) Get(id CoinID) *UnspentCoin { return s[id.Key()] }

func (s CoinStore) Clone() CoinStore {
	c := make(CoinStore, len(s))
	maps.Copy(c, s)

	return c
}