#ifndef V2X_DB_H
#define V2X_DB_H

#include <stdint.h>
#include <stdbool.h>
#include <sys/types.h>

#define V2X_MAX_FRAME_LEN  320
#define SD_CARD_MOUNT_POINT "/sdcard"
#define SD_CSV_FILE         "/sdcard/v2x_frames.csv"
#define SD_LOG_FILE         "/sdcard/v2x_log.txt"

#define CSV_LINE_MAX        512
#define RAW_HEX_BUF         2048

/* Message-Typen */
typedef enum {
    V2X_MSG_UNKNOWN   = 0,
    V2X_MSG_BSM       = 1,
    V2X_MSG_CAM       = 2,
    V2X_MSG_DENM      = 3,
    V2X_MSG_SOA3      = 4,
    V2X_MSG_SAE2619   = 5,
    V2X_MSG_SAE2725   = 6,
} v2x_msg_type_t;

/* Ein Frame: alle Felder werden in CSV geschrieben */
typedef struct {
    uint64_t     timestamp_us;  /* esp_timer_get_time() */
    uint8_t      msg_type;      /* V2X_MSG_* */
    uint8_t      channel;       /* 157-164 (5 GHz) oder 17/18 (4300 MHz) */
    float        frequency_mhz; /* z.B. 5845.0 */
    int8_t       rssi_dbm;
    int8_t       noise_dbm;
    uint8_t      rate_index;
    uint16_t     frame_len;     /* 802.11 PDU length */
    uint8_t      mac_addr[6];   /* Source MAC */
    uint8_t      bssid[6];      /* BSSID */
    uint8_t      raw_data[V2X_MAX_FRAME_LEN];
    uint16_t     raw_len;
} v2x_frame_t;

#define CSV_HEADER \
    "timestamp_us,msg_type,channel,frequency_mhz,rssi_dbm,noise_dbm,rate_index,frame_len,mac_addr,bssid,raw_hex"

/* === SD-Karte === */
esp_err_t v2x_sd_init(void);

/* === CSV-Schreiber === */
esp_err_t v2x_sd_write_frame(const v2x_frame_t *frame);

/* === Log === */
esp_err_t v2x_sd_log_write(const char *fmt, ...);

/* === Statistik === */
typedef struct {
    uint32_t total_frames;
    uint32_t cam_count;
    uint32_t denm_count;
    uint32_t bsm_count;
    uint32_t unknown_count;
    uint32_t sd_write_errors;
    uint64_t start_timestamp_us;
} v2x_stats_t;

const v2x_stats_t* v2x_sd_get_stats(void);
void v2x_sd_reset_stats(void);
esp_err_t v2x_sd_dump_stats(void);

/* === Hilfsfunktionen === */
void frame_to_csv_line(const v2x_frame_t *frame, char *out, size_t out_len);

#endif /* V2X_DB_H */