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#include "nucula_wallet.h"
#include "wallet.hpp"
#include "cashu_json.hpp"
#include "crypto.h"
#include "hex.h"
#include "esp_log.h"
#include "secp256k1.h"
#include "cJSON.h"
#include <cstring>
#include <string>
#include <vector>
static const char *TAG = "nucula_wallet";
static secp256k1_context *s_ctx = nullptr;
static cashu::Wallet *s_wallet = nullptr;
static std::vector<cashu::Proof> &mutable_proofs()
{
return const_cast<std::vector<cashu::Proof> &>(s_wallet->proofs());
}
esp_err_t nucula_wallet_init(const char *mint_url)
{
if (s_wallet) return ESP_OK;
s_ctx = secp256k1_context_create(SECP256K1_CONTEXT_SIGN | SECP256K1_CONTEXT_VERIFY);
if (!s_ctx) {
ESP_LOGE(TAG, "Failed to create secp256k1 context");
return ESP_FAIL;
}
s_wallet = new cashu::Wallet(std::string(mint_url), s_ctx, 0);
if (!s_wallet) {
ESP_LOGE(TAG, "Failed to create wallet");
secp256k1_context_destroy(s_ctx);
s_ctx = nullptr;
return ESP_FAIL;
}
s_wallet->load_from_nvs();
if (!s_wallet->load_keysets()) {
ESP_LOGW(TAG, "Keyset load failed (may be offline)");
}
ESP_LOGI(TAG, "Wallet initialized: balance=%d proofs=%d keysets=%d",
s_wallet->balance(), (int)s_wallet->proofs().size(),
(int)s_wallet->keysets().size());
return ESP_OK;
}
esp_err_t nucula_wallet_receive(const char *token_str)
{
if (!s_wallet || !token_str) return ESP_FAIL;
cashu::Token tok;
bool decoded = false;
if (strncmp(token_str, "cashuA", 6) == 0) {
decoded = cashu::deserialize_token_v3(token_str, tok);
}
if (!decoded) {
ESP_LOGE(TAG, "Failed to decode token");
return ESP_FAIL;
}
std::vector<cashu::Proof> proofs_out;
if (!s_wallet->receive(tok, proofs_out)) {
ESP_LOGE(TAG, "Receive failed");
return ESP_FAIL;
}
int total = 0;
for (const auto &p : proofs_out) total += p.amount;
ESP_LOGI(TAG, "Received %d sat (%d proofs), new balance=%d",
total, (int)proofs_out.size(), s_wallet->balance());
return ESP_OK;
}
esp_err_t nucula_wallet_send(uint64_t amount_sat, char *token_out, size_t token_out_size)
{
if (!s_wallet) return ESP_FAIL;
int amount = (int)amount_sat;
std::vector<cashu::Proof> selected, remaining;
if (!s_wallet->select_proofs(amount, selected, remaining)) {
ESP_LOGE(TAG, "Insufficient balance for %d sat", amount);
return ESP_FAIL;
}
std::vector<cashu::Proof> new_proofs, change;
if (!s_wallet->swap(selected, (int)amount_sat, new_proofs, change)) {
ESP_LOGE(TAG, "Swap for send failed");
return ESP_FAIL;
}
cashu::Token token;
token.mint = s_wallet->mint_url();
token.unit = "sat";
for (auto &p : new_proofs) token.proofs.push_back(p);
std::string encoded = cashu::serialize_token_v3(token);
if (encoded.empty()) {
ESP_LOGE(TAG, "Token serialization failed");
return ESP_FAIL;
}
if (encoded.size() >= token_out_size) {
ESP_LOGE(TAG, "Token too large: %zu >= %zu", encoded.size(), token_out_size);
return ESP_FAIL;
}
memcpy(token_out, encoded.c_str(), encoded.size() + 1);
auto &proofs = mutable_proofs();
proofs = remaining;
for (auto &p : change) proofs.push_back(p);
s_wallet->save_proofs();
ESP_LOGI(TAG, "Sent %llu sat, token=%zu bytes, remaining balance=%d",
(unsigned long long)amount_sat, encoded.size(), s_wallet->balance());
return ESP_OK;
}
uint64_t nucula_wallet_balance(void)
{
if (!s_wallet) return 0;
return (uint64_t)s_wallet->balance();
}
int nucula_wallet_proof_count(void)
{
if (!s_wallet) return 0;
return (int)s_wallet->proofs().size();
}
char *nucula_wallet_proofs_json(void)
{
if (!s_wallet) return nullptr;
const auto &proofs = s_wallet->proofs();
cJSON *arr = cJSON_CreateArray();
for (const auto &p : proofs) {
cJSON *obj = cJSON_CreateObject();
cJSON_AddNumberToObject(obj, "amount", p.amount);
cJSON_AddStringToObject(obj, "id", p.id.c_str());
cJSON_AddItemToArray(arr, obj);
}
char *json = cJSON_PrintUnformatted(arr);
cJSON_Delete(arr);
return json;
}
esp_err_t nucula_wallet_swap_all(void)
{
if (!s_wallet) return ESP_FAIL;
auto &proofs = mutable_proofs();
if (proofs.empty()) {
ESP_LOGW(TAG, "No proofs to swap");
return ESP_FAIL;
}
int old_balance = s_wallet->balance();
std::vector<cashu::Proof> inputs = proofs;
std::vector<cashu::Proof> new_proofs, change;
if (!s_wallet->swap(inputs, -1, new_proofs, change)) {
ESP_LOGE(TAG, "Swap failed");
return ESP_FAIL;
}
proofs.clear();
for (auto &p : new_proofs) proofs.push_back(p);
for (auto &p : change) proofs.push_back(p);
s_wallet->save_proofs();
ESP_LOGI(TAG, "Swap complete: %d -> %d sat (%d proofs)",
old_balance, s_wallet->balance(), (int)proofs.size());
return ESP_OK;
}
void nucula_wallet_print_status(void)
{
if (!s_wallet) {
ESP_LOGI(TAG, "Wallet not initialized");
return;
}
ESP_LOGI(TAG, "Wallet: balance=%d proofs=%d keysets=%d",
s_wallet->balance(), (int)s_wallet->proofs().size(),
(int)s_wallet->keysets().size());
const auto &proofs = s_wallet->proofs();
for (size_t i = 0; i < proofs.size(); i++) {
ESP_LOGI(TAG, " [%d] amount=%d id=%s", (int)i,
proofs[i].amount, proofs[i].id.c_str());
}
}
esp_err_t nucula_wallet_melt(const char *bolt11_invoice, uint64_t max_fee_sats)
{
if (!s_wallet || !bolt11_invoice) return ESP_FAIL;
cashu::MeltQuote quote;
if (!s_wallet->request_melt_quote(std::string(bolt11_invoice), quote)) {
ESP_LOGE(TAG, "Melt quote request failed");
return ESP_FAIL;
}
uint64_t total_cost = (uint64_t)quote.amount + (uint64_t)quote.fee_reserve;
if (total_cost > max_fee_sats) {
ESP_LOGE(TAG, "Melt cost %llu exceeds max %llu (amount=%d fee=%d)",
(unsigned long long)total_cost, (unsigned long long)max_fee_sats,
quote.amount, quote.fee_reserve);
return ESP_FAIL;
}
int balance_before = s_wallet->balance();
if (balance_before < quote.amount) {
ESP_LOGE(TAG, "Insufficient balance: %d < %d", balance_before, quote.amount);
return ESP_FAIL;
}
int change_amount = 0;
if (!s_wallet->melt_tokens(quote, change_amount)) {
ESP_LOGE(TAG, "Melt tokens failed");
return ESP_FAIL;
}
ESP_LOGI(TAG, "Melted: %d sats paid, %d change, balance=%d->%d",
quote.amount, change_amount, balance_before, s_wallet->balance());
return ESP_OK;
}
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