/**

* @file nvs_config.c

* @brief Runtime configuration via NVS (Non-Volatile Storage).

*

* Checks NVS namespace "csi_cfg" for keys: ssid, password, target_ip,

* target_port, node_id. Falls back to Kconfig defaults when absent.

*/

#include "nvs_config.h"

#include <string.h>

#include "esp_log.h"

#include "nvs_flash.h"

#include "nvs.h"

#include "sdkconfig.h"

static const char *TAG = "nvs_config";

void nvs_config_load(nvs_config_t *cfg)

{

if (cfg == NULL) {

ESP_LOGE(TAG, "nvs_config_load: cfg is NULL");

return;

}

/* Start with Kconfig compiled defaults */

strncpy(cfg->wifi_ssid, CONFIG_CSI_WIFI_SSID, NVS_CFG_SSID_MAX - 1);

cfg->wifi_ssid[NVS_CFG_SSID_MAX - 1] = '\0';

#ifdef CONFIG_CSI_WIFI_PASSWORD

strncpy(cfg->wifi_password, CONFIG_CSI_WIFI_PASSWORD, NVS_CFG_PASS_MAX - 1);

cfg->wifi_password[NVS_CFG_PASS_MAX - 1] = '\0';

#else

cfg->wifi_password[0] = '\0';

#endif

strncpy(cfg->target_ip, CONFIG_CSI_TARGET_IP, NVS_CFG_IP_MAX - 1);

cfg->target_ip[NVS_CFG_IP_MAX - 1] = '\0';

cfg->target_port = (uint16_t)CONFIG_CSI_TARGET_PORT;

cfg->node_id = (uint8_t)CONFIG_CSI_NODE_ID;

/* ADR-029: Defaults for channel hopping and TDM.

* hop_count=1 means single-channel (backward-compatible). */

cfg->channel_hop_count = 1;

cfg->channel_list[0] = (uint8_t)CONFIG_CSI_WIFI_CHANNEL;

for (uint8_t i = 1; i < NVS_CFG_HOP_MAX; i++) {

cfg->channel_list[i] = 0;

}

cfg->dwell_ms = 50;

cfg->tdm_slot_index = 0;

cfg->tdm_node_count = 1;

/* ADR-039: Edge intelligence defaults from Kconfig. */

#ifdef CONFIG_EDGE_TIER

cfg->edge_tier = (uint8_t)CONFIG_EDGE_TIER;

#else

cfg->edge_tier = 2;

#endif

cfg->presence_thresh = 0.0f; /* 0 = auto-calibrate. */

#ifdef CONFIG_EDGE_FALL_THRESH

cfg->fall_thresh = (float)CONFIG_EDGE_FALL_THRESH / 1000.0f;

#else

cfg->fall_thresh = 2.0f;

#endif

cfg->vital_window = 256;

#ifdef CONFIG_EDGE_VITAL_INTERVAL_MS

cfg->vital_interval_ms = (uint16_t)CONFIG_EDGE_VITAL_INTERVAL_MS;

#else

cfg->vital_interval_ms = 1000;

#endif

#ifdef CONFIG_EDGE_TOP_K

cfg->top_k_count = (uint8_t)CONFIG_EDGE_TOP_K;

#else

cfg->top_k_count = 8;

#endif

#ifdef CONFIG_EDGE_POWER_DUTY

cfg->power_duty = (uint8_t)CONFIG_EDGE_POWER_DUTY;

#else

cfg->power_duty = 100;

#endif

/* ADR-040: WASM programmable sensing defaults from Kconfig. */

#ifdef CONFIG_WASM_MAX_MODULES

cfg->wasm_max_modules = (uint8_t)CONFIG_WASM_MAX_MODULES;

#else

cfg->wasm_max_modules = 4;

#endif

cfg->wasm_verify = 1; /* Default: verify enabled (secure-by-default). */

#ifndef CONFIG_WASM_VERIFY_SIGNATURE

cfg->wasm_verify = 0; /* Kconfig disabled signature verification. */

#endif

/* Try to override from NVS */

nvs_handle_t handle;

esp_err_t err = nvs_open("csi_cfg", NVS_READONLY, &handle);

if (err != ESP_OK) {

ESP_LOGI(TAG, "No NVS config found, using compiled defaults");

return;

}

size_t len;

char buf[NVS_CFG_PASS_MAX];

/* WiFi SSID */

len = sizeof(buf);

if (nvs_get_str(handle, "ssid", buf, &len) == ESP_OK && len > 1) {

strncpy(cfg->wifi_ssid, buf, NVS_CFG_SSID_MAX - 1);

cfg->wifi_ssid[NVS_CFG_SSID_MAX - 1] = '\0';

ESP_LOGI(TAG, "NVS override: ssid=%s", cfg->wifi_ssid);

}

/* WiFi password */

len = sizeof(buf);

if (nvs_get_str(handle, "password", buf, &len) == ESP_OK) {

strncpy(cfg->wifi_password, buf, NVS_CFG_PASS_MAX - 1);

cfg->wifi_password[NVS_CFG_PASS_MAX - 1] = '\0';

ESP_LOGI(TAG, "NVS override: password=***");

}

/* Target IP */

len = sizeof(buf);

if (nvs_get_str(handle, "target_ip", buf, &len) == ESP_OK && len > 1) {

strncpy(cfg->target_ip, buf, NVS_CFG_IP_MAX - 1);

cfg->target_ip[NVS_CFG_IP_MAX - 1] = '\0';

ESP_LOGI(TAG, "NVS override: target_ip=%s", cfg->target_ip);

}

/* Target port */

uint16_t port_val;

if (nvs_get_u16(handle, "target_port", &port_val) == ESP_OK) {

cfg->target_port = port_val;

ESP_LOGI(TAG, "NVS override: target_port=%u", cfg->target_port);

}

/* Node ID */

uint8_t node_val;

if (nvs_get_u8(handle, "node_id", &node_val) == ESP_OK) {

cfg->node_id = node_val;

ESP_LOGI(TAG, "NVS override: node_id=%u", cfg->node_id);

}

/* ADR-029: Channel hop count */

uint8_t hop_count_val;

if (nvs_get_u8(handle, "hop_count", &hop_count_val) == ESP_OK) {

if (hop_count_val >= 1 && hop_count_val <= NVS_CFG_HOP_MAX) {

cfg->channel_hop_count = hop_count_val;

ESP_LOGI(TAG, "NVS override: hop_count=%u", (unsigned)cfg->channel_hop_count);

} else {

ESP_LOGW(TAG, "NVS hop_count=%u out of range [1..%u], ignored",

(unsigned)hop_count_val, (unsigned)NVS_CFG_HOP_MAX);

}

}

/* ADR-029: Channel list (stored as a blob of up to NVS_CFG_HOP_MAX bytes) */

len = NVS_CFG_HOP_MAX;

uint8_t ch_blob[NVS_CFG_HOP_MAX];

if (nvs_get_blob(handle, "chan_list", ch_blob, &len) == ESP_OK && len > 0) {

uint8_t count = (len < cfg->channel_hop_count) ? (uint8_t)len : cfg->channel_hop_count;

for (uint8_t i = 0; i < count; i++) {

cfg->channel_list[i] = ch_blob[i];

}

ESP_LOGI(TAG, "NVS override: chan_list loaded (%u channels)", (unsigned)count);

}

/* ADR-029: Dwell time */

uint32_t dwell_val;

if (nvs_get_u32(handle, "dwell_ms", &dwell_val) == ESP_OK) {

if (dwell_val >= 10) {

cfg->dwell_ms = dwell_val;

ESP_LOGI(TAG, "NVS override: dwell_ms=%lu", (unsigned long)cfg->dwell_ms);

} else {

ESP_LOGW(TAG, "NVS dwell_ms=%lu too small, ignored", (unsigned long)dwell_val);

}

}

/* ADR-029/031: TDM slot index */

uint8_t slot_val;

if (nvs_get_u8(handle, "tdm_slot", &slot_val) == ESP_OK) {

cfg->tdm_slot_index = slot_val;

ESP_LOGI(TAG, "NVS override: tdm_slot_index=%u", (unsigned)cfg->tdm_slot_index);

}

/* ADR-029/031: TDM node count */

uint8_t tdm_nodes_val;

if (nvs_get_u8(handle, "tdm_nodes", &tdm_nodes_val) == ESP_OK) {

if (tdm_nodes_val >= 1) {

cfg->tdm_node_count = tdm_nodes_val;

ESP_LOGI(TAG, "NVS override: tdm_node_count=%u", (unsigned)cfg->tdm_node_count);

} else {

ESP_LOGW(TAG, "NVS tdm_nodes=%u invalid, ignored", (unsigned)tdm_nodes_val);

}

}

/* ADR-039: Edge intelligence overrides. */

uint8_t edge_tier_val;

if (nvs_get_u8(handle, "edge_tier", &edge_tier_val) == ESP_OK) {

if (edge_tier_val <= 2) {

cfg->edge_tier = edge_tier_val;

ESP_LOGI(TAG, "NVS override: edge_tier=%u", (unsigned)cfg->edge_tier);

}

}

/* Presence threshold stored as u16 (value * 1000). */

uint16_t pres_thresh_val;

if (nvs_get_u16(handle, "pres_thresh", &pres_thresh_val) == ESP_OK) {

cfg->presence_thresh = (float)pres_thresh_val / 1000.0f;

ESP_LOGI(TAG, "NVS override: presence_thresh=%.3f", cfg->presence_thresh);

}

/* Fall threshold stored as u16 (value * 1000). */

uint16_t fall_thresh_val;

if (nvs_get_u16(handle, "fall_thresh", &fall_thresh_val) == ESP_OK) {

cfg->fall_thresh = (float)fall_thresh_val / 1000.0f;

ESP_LOGI(TAG, "NVS override: fall_thresh=%.3f", cfg->fall_thresh);

}

uint16_t vital_win_val;

if (nvs_get_u16(handle, "vital_win", &vital_win_val) == ESP_OK) {

if (vital_win_val >= 32 && vital_win_val <= 256) {

cfg->vital_window = vital_win_val;

ESP_LOGI(TAG, "NVS override: vital_window=%u", cfg->vital_window);

}

}

uint16_t vital_int_val;

if (nvs_get_u16(handle, "vital_int", &vital_int_val) == ESP_OK) {

if (vital_int_val >= 100) {

cfg->vital_interval_ms = vital_int_val;

ESP_LOGI(TAG, "NVS override: vital_interval_ms=%u", cfg->vital_interval_ms);

}

}

uint8_t topk_val;

if (nvs_get_u8(handle, "subk_count", &topk_val) == ESP_OK) {

if (topk_val >= 1 && topk_val <= 32) {

cfg->top_k_count = topk_val;

ESP_LOGI(TAG, "NVS override: top_k_count=%u", (unsigned)cfg->top_k_count);

}

}

uint8_t duty_val;

if (nvs_get_u8(handle, "power_duty", &duty_val) == ESP_OK) {

if (duty_val >= 10 && duty_val <= 100) {

cfg->power_duty = duty_val;

ESP_LOGI(TAG, "NVS override: power_duty=%u%%", (unsigned)cfg->power_duty);

}

}

/* ADR-040: WASM configuration overrides. */

uint8_t wasm_max_val;

if (nvs_get_u8(handle, "wasm_max", &wasm_max_val) == ESP_OK) {

if (wasm_max_val >= 1 && wasm_max_val <= 8) {

cfg->wasm_max_modules = wasm_max_val;

ESP_LOGI(TAG, "NVS override: wasm_max_modules=%u", (unsigned)cfg->wasm_max_modules);

}

}

uint8_t wasm_verify_val;

if (nvs_get_u8(handle, "wasm_verify", &wasm_verify_val) == ESP_OK) {

cfg->wasm_verify = wasm_verify_val ? 1 : 0;

ESP_LOGI(TAG, "NVS override: wasm_verify=%u", (unsigned)cfg->wasm_verify);

}

/* ADR-040: Load WASM signing public key from NVS (32-byte blob). */

cfg->wasm_pubkey_valid = 0;

memset(cfg->wasm_pubkey, 0, 32);

size_t pubkey_len = 32;

if (nvs_get_blob(handle, "wasm_pubkey", cfg->wasm_pubkey, &pubkey_len) == ESP_OK

&& pubkey_len == 32)

{

cfg->wasm_pubkey_valid = 1;

ESP_LOGI(TAG, "NVS: wasm_pubkey loaded (%02x%02x...%02x%02x)",

cfg->wasm_pubkey[0], cfg->wasm_pubkey[1],

cfg->wasm_pubkey[30], cfg->wasm_pubkey[31]);

} else if (cfg->wasm_verify) {

ESP_LOGW(TAG, "wasm_verify=1 but no wasm_pubkey in NVS — uploads will be rejected");

}

/* Validate tdm_slot_index < tdm_node_count */

if (cfg->tdm_slot_index >= cfg->tdm_node_count) {

ESP_LOGW(TAG, "tdm_slot_index=%u >= tdm_node_count=%u, clamping to 0",

(unsigned)cfg->tdm_slot_index, (unsigned)cfg->tdm_node_count);

cfg->tdm_slot_index = 0;

}

nvs_close(handle);

}