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#include "wallet_persist.h"
#include "wallet.h"
#include "config.h"
#include "esp_log.h"
#include "cJSON.h"
#include <string.h>
#include <stdio.h>
#include <unistd.h>
static const char *TAG = "wallet_persist";
static const char *WALLET_FILE = "/spiffs/wallet.json";
esp_err_t wallet_persist_save(void)
{
const tollgate_config_t *cfg = tollgate_config_get();
wallet_t *w = wallet_get();
if (w->balance < cfg->persist_threshold_sats) {
if (w->proof_count == 0) {
unlink(WALLET_FILE);
ESP_LOGI(TAG, "Wallet empty, removed persist file");
}
return ESP_OK;
}
cJSON *root = cJSON_CreateObject();
cJSON_AddNumberToObject(root, "balance", (double)w->balance);
cJSON *proofs = cJSON_CreateArray();
for (int i = 0; i < w->proof_count; i++) {
cJSON *p = cJSON_CreateObject();
cJSON_AddNumberToObject(p, "amount", (double)w->proofs[i].amount);
cJSON_AddStringToObject(p, "id", w->proofs[i].id);
cJSON_AddStringToObject(p, "secret", w->proofs[i].secret);
cJSON_AddStringToObject(p, "C", w->proofs[i].c);
cJSON_AddItemToArray(proofs, p);
}
cJSON_AddItemToObject(root, "proofs", proofs);
cJSON *keysets = cJSON_CreateArray();
for (int i = 0; i < w->keyset_count; i++) {
cJSON *ks = cJSON_CreateObject();
cJSON_AddStringToObject(ks, "id", w->keysets[i].id);
cJSON_AddItemToArray(keysets, ks);
}
cJSON_AddItemToObject(root, "keysets", keysets);
char *json_str = cJSON_PrintUnformatted(root);
cJSON_Delete(root);
FILE *f = fopen(WALLET_FILE, "w");
if (!f) {
ESP_LOGE(TAG, "Failed to open %s for writing", WALLET_FILE);
cJSON_free(json_str);
return ESP_FAIL;
}
size_t written = fwrite(json_str, 1, strlen(json_str), f);
fclose(f);
cJSON_free(json_str);
ESP_LOGI(TAG, "Wallet persisted: %d proofs, balance=%llu (%zu bytes)",
w->proof_count, (unsigned long long)w->balance, written);
return ESP_OK;
}
esp_err_t wallet_persist_load(void)
{
wallet_t *w = wallet_get();
FILE *f = fopen(WALLET_FILE, "r");
if (!f) {
ESP_LOGI(TAG, "No persisted wallet found, starting fresh");
return ESP_OK;
}
fseek(f, 0, SEEK_END);
long fsize = ftell(f);
fseek(f, 0, SEEK_SET);
if (fsize <= 0 || fsize > 65536) {
fclose(f);
ESP_LOGW(TAG, "Wallet file size invalid: %ld", fsize);
return ESP_FAIL;
}
char *buf = malloc(fsize + 1);
if (!buf) {
fclose(f);
return ESP_ERR_NO_MEM;
}
fread(buf, 1, fsize, f);
buf[fsize] = '\0';
fclose(f);
cJSON *root = cJSON_Parse(buf);
free(buf);
if (!root) {
ESP_LOGE(TAG, "Failed to parse wallet.json");
return ESP_FAIL;
}
cJSON *balance_j = cJSON_GetObjectItemCaseSensitive(root, "balance");
if (balance_j && cJSON_IsNumber(balance_j)) {
w->balance = (uint64_t)balance_j->valuedouble;
}
cJSON *proofs = cJSON_GetObjectItemCaseSensitive(root, "proofs");
if (proofs && cJSON_IsArray(proofs)) {
int count = cJSON_GetArraySize(proofs);
if (count > WALLET_MAX_PROOFS) count = WALLET_MAX_PROOFS;
for (int i = 0; i < count; i++) {
cJSON *p = cJSON_GetArrayItem(proofs, i);
cJSON *amt = cJSON_GetObjectItemCaseSensitive(p, "amount");
cJSON *id = cJSON_GetObjectItemCaseSensitive(p, "id");
cJSON *secret = cJSON_GetObjectItemCaseSensitive(p, "secret");
cJSON *c = cJSON_GetObjectItemCaseSensitive(p, "C");
if (amt) w->proofs[i].amount = (uint64_t)amt->valuedouble;
if (id && cJSON_IsString(id))
strncpy(w->proofs[i].id, id->valuestring, WALLET_KEYSET_ID_LEN - 1);
if (secret && cJSON_IsString(secret))
strncpy(w->proofs[i].secret, secret->valuestring, WALLET_SECRET_LEN - 1);
if (c && cJSON_IsString(c))
strncpy(w->proofs[i].c, c->valuestring, WALLET_SIG_LEN - 1);
w->proof_count++;
}
}
cJSON *keysets = cJSON_GetObjectItemCaseSensitive(root, "keysets");
if (keysets && cJSON_IsArray(keysets)) {
int count = cJSON_GetArraySize(keysets);
if (count > WALLET_MAX_KEYSETS) count = WALLET_MAX_KEYSETS;
for (int i = 0; i < count; i++) {
cJSON *ks = cJSON_GetArrayItem(keysets, i);
cJSON *id = cJSON_GetObjectItemCaseSensitive(ks, "id");
if (id && cJSON_IsString(id))
strncpy(w->keysets[i].id, id->valuestring, WALLET_KEYSET_ID_LEN - 1);
w->keyset_count++;
}
}
cJSON_Delete(root);
ESP_LOGI(TAG, "Wallet loaded: %d proofs, %d keysets, balance=%llu",
w->proof_count, w->keyset_count, (unsigned long long)w->balance);
return ESP_OK;
}
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