#ifndef OPENUF_SYSINFO_H
#define OPENUF_SYSINFO_H

/*
 * openuf - sysinfo.h
 *
 * Reads system statistics (CPU, RAM, interfaces, radios).
 * All readings come directly from the Linux kernel:
 *
 *   /proc/stat        → CPU usage (deltas between two snapshots)
 *   /proc/meminfo     → total/free/buffer/cache memory
 *   /proc/net/dev     → rx/tx counters per interface
 *   /sys/class/net/   → speed, duplex, operstate, MAC
 *   iw dev <if> info  → current channel, TX power
 *   iw dev <if> survey dump → channel utilization
 */

#include <stdbool.h>

/* ── Memory ─────────────────────────────────────────────────────── */
typedef struct {
    long total_kb;
    long free_kb;
    long buffer_kb;
    long cached_kb;
} mem_stats_t;

int sysinfo_mem(mem_stats_t *out);

/* ── CPU ─────────────────────────────────────────────────────────── */
/* Returns % CPU usage (0-100). The first call returns 0 (takes a snapshot).
 * Subsequent calls compute the delta relative to the previous one.
 * With a 10s interval this gives a good average of usage.  */
int sysinfo_cpu_percent(void);

/* ── Network interface ─────────────────────────────────────────────── */
typedef struct {
    char      name[32];
    char      mac[32];
    char      ip[64];
    bool      up;
    int       speed;        /* Mbps: 10/100/1000; -1 if not available */
    bool      full_duplex;
    long long rx_bytes;
    long long tx_bytes;
    long long rx_packets;
    long long tx_packets;
    long long rx_errors;
    long long tx_errors;
    long long rx_dropped;
    long long tx_dropped;
    long long rx_frame;
    long long rx_multicast;
} iface_stats_t;

int sysinfo_iface(const char *ifname, iface_stats_t *out);

/* ── Radio WiFi ─────────────────────────────────────────────────── */
typedef struct {
    char name[32];
    char iface[32];
    int  channel;
    int  tx_power;
    int  cu_total;    /* % total channel usage */
    int  cu_self_tx;  /* % time spent transmitting */
    int  cu_self_rx;  /* % time spent receiving */
    int  num_sta;
    int  noise;       /* dBm */
    int  nss;         /* usable spatial streams */
    int  tx_antennas; /* configured TX chains */
    int  rx_antennas; /* configured RX chains */
    long long tx_packets;
    long long tx_retries;
    long long tx_failed;
    long long tx_duration; /* microseconds */
    long long rx_duration; /* microseconds */
} radio_stats_t;

/* iface: "wlan0", "wlan1" */
int sysinfo_radio(const char *iface, radio_stats_t *out);

#define MAX_SCAN_RESULTS 128

typedef struct {
    char bssid[32];
    char essid[64];
    int  frequency;
    int  channel;
    int  signal;       /* dBm */
    int  rssi;         /* controller-compatible quality, 0-100 */
    int  age;          /* seconds since last seen */
    bool secured;
} wifi_scan_t;

/* Read the kernel's cached BSS list without starting a disruptive scan. */
int sysinfo_wifi_scan_cache(const char *iface, wifi_scan_t *out, int max_out);

#endif /* OPENUF_SYSINFO_H */