#ifndef CONFIG_MANAGER_H
#define CONFIG_MANAGER_H

#include <Arduino.h>
#include <ArduinoJson.h>

#define NVS_NAMESPACE "acuvim_cfg"

struct DeviceConfig {
    char device_id[32];

    // WiFi
    char wifi_ssid[64];
    char wifi_password[64];
    bool wifi_enabled;

    // MQTT
    char mqtt_broker[128];
    uint16_t mqtt_port;
    char mqtt_username[64];
    char mqtt_password[64];
    char mqtt_topic_prefix[64];
    bool mqtt_tls;

    // GSM
    char gsm_apn[64];
    char gsm_user[32];
    char gsm_pass[32];
    bool gsm_enabled;

    // Transport
    uint8_t transport_priority;
    uint16_t gsm_poll_interval_sec;
    bool gsm_batch_enabled;
    uint8_t gsm_batch_size;

    // SD Card
    uint16_t sd_retention_days;

    // Console
    char console_url[128];

    // Acuvim II / Modbus
    uint8_t modbus_slave_addr;
    uint32_t modbus_baud_rate;
    uint16_t poll_interval_sec;

    // Sleep
    uint16_t sleep_duration_min;
    uint16_t wake_duration_sec;

    // Heartbeat
    uint16_t heartbeat_interval_sec;

    // OTA
    uint8_t ota_check_interval_hours;
    uint8_t ota_auto_update;

    // Firmware
    char firmware_version[16];
};

class ConfigManager {
public:
    void begin();
    void save();
    void reset();

    DeviceConfig& get() { return _config; }
    const DeviceConfig& get() const { return _config; }

    String toJson(bool includeSecrets = false);
    bool fromJson(const String& json);

    String getDeviceId();

private:
    DeviceConfig _config;

    void loadDefaults();
    void loadFromNVS();
    void generateDeviceId();
};

#endif