/*
 * openbsd.c
 * Contains OpenBSD specific stuff
 *
 */

#include <sys/dkstat.h>
#include <sys/param.h>
#include <sys/resource.h>
#include <sys/socket.h>
#include <sys/sysctl.h>
#include <sys/time.h>
#include <sys/types.h>
#include <sys/vmmeter.h>
#include <sys/user.h>
#include <sys/ioctl.h>
#include <sys/sensors.h>
#include <sys/malloc.h>
#include <sys/swap.h>
#include <kvm.h>

#include <net/if.h>
#include <net/if_media.h>
#include <netinet/in.h>

#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <ifaddrs.h>
#include <limits.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <machine/apmvar.h>

#include <net80211/ieee80211.h>
#include <net80211/ieee80211_ioctl.h>

#include "conky.h"

#define	MAXSHOWDEVS		16

#define LOG1024			10
#define pagetok(size) ((size) << pageshift)

inline void proc_find_top(struct process **cpu, struct process **mem);

static short cpu_setup = 0;
static kvm_t *kd = 0;

struct ifmibdata *data = NULL;
size_t len = 0;

int init_kvm = 0;
int init_sensors = 0;

static int kvm_init()
{
	if(init_kvm)
		return 1;

	kd = kvm_open(NULL, NULL, NULL, KVM_NO_FILES, NULL);
	if(kd == NULL)
		fprintf(stderr, "error opening kvm\n");
	else	init_kvm = 1;

	return 1;
}

/* note: swapmode taken from 'top' source */
/*
 * swapmode is rewritten by Tobias Weingartner <weingart@openbsd.org>
 * to be based on the new swapctl(2) system call.
 */
static int
swapmode(int *used, int *total)
{
	struct swapent *swdev;
	int nswap, rnswap, i;

	nswap = swapctl(SWAP_NSWAP, 0, 0);
	if (nswap == 0)
		return 0;

	swdev = malloc(nswap * sizeof(*swdev));
	if (swdev == NULL)
		return 0;

	rnswap = swapctl(SWAP_STATS, swdev, nswap);
	if (rnswap == -1)
		return 0;

	/* if rnswap != nswap, then what? */

	/* Total things up */
	*total = *used = 0;
	for (i = 0; i < nswap; i++) {
		if (swdev[i].se_flags & SWF_ENABLE) {
			*used += (swdev[i].se_inuse / (1024 / DEV_BSIZE));
			*total += (swdev[i].se_nblks / (1024 / DEV_BSIZE));
		}
	}
	free(swdev);
	return 1;
}

void
update_uptime()
{
	int mib[2] = { CTL_KERN, KERN_BOOTTIME };
	struct timeval boottime;
	time_t now;
	size_t size = sizeof (boottime);

	if ((sysctl(mib, 2, &boottime, &size, NULL, 0) != -1) &&
			(boottime.tv_sec != 0)) {
		time(&now);
		info.uptime = now - boottime.tv_sec;
	} else {
		fprintf(stderr, "Could not get uptime\n");
		info.uptime = 0;
	}
}

void
update_meminfo()
{
	static int mib[2] = {CTL_VM, VM_METER};
	struct vmtotal vmtotal;
	size_t size;
	int pagesize, pageshift, swap_avail, swap_used;

	pagesize = getpagesize();
	pageshift = 0;
	while (pagesize > 1) {
		pageshift++;
		pagesize >>= 1;
	}

	/* we only need the amount of log(2)1024 for our conversion */
	pageshift -= LOG1024;

	/* get total -- systemwide main memory usage structure */
	size = sizeof(vmtotal);
	if (sysctl(mib, 2, &vmtotal, &size, NULL, 0) < 0) {
		warn("sysctl failed");
		bzero(&vmtotal, sizeof(vmtotal));
	}

	info.memmax =  pagetok(vmtotal.t_rm) + pagetok(vmtotal.t_free);
	info.mem = pagetok(vmtotal.t_rm);

	if ((swapmode(&swap_used, &swap_avail)) >= 0) {
		info.swapmax = swap_avail;
		info.swap = swap_used;
	} else {
		info.swapmax = 0;
		info.swap = 0;
	}
}

void
update_net_stats()
{
	struct net_stat *ns;
	double delta;
	long long r, t, last_recv, last_trans;
	struct ifaddrs *ifap, *ifa;
	struct if_data *ifd;


	/* get delta */
	delta = current_update_time - last_update_time;
	if (delta <= 0.0001)
		return;

	if (getifaddrs(&ifap) < 0)
		return;

	for (ifa = ifap; ifa; ifa = ifa->ifa_next) {
		ns = get_net_stat((const char *) ifa->ifa_name);

		if (ifa->ifa_flags & IFF_UP) {
			struct ifaddrs *iftmp;

			ns->up = 1;
			ns->linkstatus = 1;
			last_recv = ns->recv;
			last_trans = ns->trans;

			if (ifa->ifa_addr->sa_family != AF_LINK)
				continue;

			for (iftmp = ifa->ifa_next; iftmp != NULL &&
				strcmp(ifa->ifa_name, iftmp->ifa_name) == 0;
				iftmp = iftmp->ifa_next)
				if (iftmp->ifa_addr->sa_family == AF_INET)
					memcpy(&(ns->addr), iftmp->ifa_addr,
						iftmp->ifa_addr->sa_len);

			ifd = (struct if_data *) ifa->ifa_data;
			r = ifd->ifi_ibytes;
			t = ifd->ifi_obytes;

			if (r < ns->last_read_recv)
				ns->recv +=
				    ((long long) 4294967295U -
					ns->last_read_recv) + r;
			else
				ns->recv += (r - ns->last_read_recv);

			ns->last_read_recv = r;

			if (t < ns->last_read_trans)
				ns->trans +=
				    ((long long) 4294967295U -
					ns->last_read_trans) + t;
			else
				ns->trans += (t - ns->last_read_trans);

			ns->last_read_trans = t;

			/* calculate speeds */
			ns->recv_speed = (ns->recv - last_recv) / delta;
			ns->trans_speed = (ns->trans - last_trans) / delta;
		} else {
			ns->up = 0;
			ns->linkstatus = 0;
		}
	}

	freeifaddrs(ifap);
}

void
update_total_processes()
{
	int n_processes;

	kvm_init();
	kvm_getprocs(kd, KERN_PROC_ALL, 0, &n_processes); 

	info.procs = n_processes;
}

void
update_running_processes()
{
	struct kinfo_proc2 *p;
	int n_processes;
	int i, cnt = 0;

	kvm_init();
	int max_size = sizeof(struct kinfo_proc2);
	p = kvm_getproc2(kd, KERN_PROC_ALL, 0, max_size, &n_processes);
	for (i = 0; i < n_processes; i++) {
		if (p[i].p_stat == SRUN)
			cnt++;
	}

	info.run_procs = cnt;
}

struct cpu_load_struct {
	unsigned long load[5];
};

struct cpu_load_struct fresh = { {0, 0, 0, 0, 0} };
long cpu_used, oldtotal, oldused;

void
get_cpu_count()
{
	/*
	 * FIXME: is it possible to get per cpu stats with openbsd?
	 */
#if 0
	int cpu_count = 0;
	int mib[2] = { CTL_HW, HW_NCPU };
	size_t len = sizeof(cpu_count);
	if (sysctl(mib, 2, &cpu_count, &len, NULL, 0) == 0)
		info.cpu_count = cpu_count;
	else	/* last resort, 1 cpu */
#endif
		info.cpu_count = 1;

	info.cpu_usage = malloc(info.cpu_count * sizeof (float));
	if (info.cpu_usage == NULL)
		CRIT_ERR("malloc");
}

void
update_cpu_usage()
{
	int mib[2] = { CTL_KERN, KERN_CPTIME };
	long used, total;
	long cp_time[CPUSTATES];
	size_t len = sizeof (cp_time);

	/* add check for !info.cpu_usage since that mem is freed on a SIGUSR1 */
	if ((cpu_setup == 0) || (!info.cpu_usage)) {
		get_cpu_count();
		cpu_setup = 1;
	}

	if (sysctl(mib, 2, &cp_time, &len, NULL, 0) < 0) {
		(void) fprintf(stderr, "Cannot get kern.cp_time");
	}

	fresh.load[0] = cp_time[CP_USER];
	fresh.load[1] = cp_time[CP_NICE];
	fresh.load[2] = cp_time[CP_SYS];
	fresh.load[3] = cp_time[CP_IDLE];
	fresh.load[4] = cp_time[CP_IDLE];

	used = fresh.load[0] + fresh.load[1] + fresh.load[2];
	total =
	    fresh.load[0] + fresh.load[1] + fresh.load[2] + fresh.load[3];

	if ((total - oldtotal) != 0) {
		info.cpu_usage[0] = ((double) (used - oldused)) /
			(double) (total - oldtotal);
	} else {
		info.cpu_usage[0] = 0;
	}

	oldused = used;
	oldtotal = total;
}

void
update_load_average()
{
	double v[3];
	getloadavg(v, 3);

	info.loadavg[0] = (float) v[0];
	info.loadavg[1] = (float) v[1];
	info.loadavg[2] = (float) v[2];
}

/* read sensors from sysctl */
void update_obsd_sensors()
{
	int sensor_cnt, dev, numt, mib[5] = { CTL_HW, HW_SENSORS, 0, 0, 0 };
	struct sensor sensor;
	struct sensordev sensordev;
	size_t slen,sdlen;
	enum sensor_type type;

	slen = sizeof(sensor);
	sdlen = sizeof(sensordev);

	sensor_cnt = 0;

	dev = obsd_sensors.device; // FIXME: read more than one device

	/* for (dev = 0; dev < MAXSENSORDEVICES; dev++) { */
		mib[2] = dev;
		if(sysctl(mib, 3, &sensordev, &sdlen, NULL, 0) == -1) {
			if (errno != ENOENT)
				warn("sysctl");
			return;
			//continue;
		}
		for (type = 0; type < SENSOR_MAX_TYPES; type++) {
			mib[3] = type;
			for (numt = 0; numt < sensordev.maxnumt[type]; numt++) {
				mib[4] = numt;
				if (sysctl(mib, 5, &sensor, &slen, NULL, 0)
				    == -1) {
					if (errno != ENOENT)
						warn("sysctl");
					continue;
				}
				if (sensor.flags & SENSOR_FINVALID)
					continue;

				switch (type) {
					case SENSOR_TEMP:
						//printf("num: %i value: %.2f\n", sensor.numt, (sensor.value - 273150000) / 1000000.0);
						obsd_sensors.temp[dev][sensor.numt] = (sensor.value - 273150000) / 1000000.0;
						break;
					case SENSOR_FANRPM:
						//printf("num: %i value: %i\n", sensor.numt, sensor.value);
						obsd_sensors.fan[dev][sensor.numt] = sensor.value;
						break;
					case SENSOR_VOLTS_DC:
						obsd_sensors.volt[dev][sensor.numt] = sensor.value/1000000.0;
						break;
					default:
						break;
				}

				sensor_cnt++;
			}
		}
	/* } */

	init_sensors = 1;
}

/* chipset vendor */
void get_obsd_vendor(char *buf, size_t client_buffer_size)
{
	int mib[2];
	mib[0] = CTL_HW;
	mib[1] = HW_VENDOR;
	char vendor[64];
	size_t size = sizeof(vendor);
	if(sysctl(mib, 2, vendor, &size, NULL, 0) == -1) {
		fprintf(stderr, "error reading vendor");
		snprintf(buf, client_buffer_size, "unknown");
	} else {
		snprintf(buf, client_buffer_size, "%s", vendor);
	}
}

/* chipset name */
void get_obsd_product(char *buf, size_t client_buffer_size)
{
	int mib[2];
	mib[0] = CTL_HW;
	mib[1] = HW_PRODUCT;
	char product[64];
	size_t size = sizeof(product);
	if(sysctl(mib, 2, product, &size, NULL, 0) == -1) {
		fprintf(stderr, "error reading product");
		snprintf(buf, client_buffer_size, "unknown");
	} else {
		snprintf(buf, client_buffer_size, "%s", product);
	}
}

/* rdtsc() and get_freq_dynamic() copied from linux.c */

#if  defined(__i386) || defined(__x86_64)
__inline__ unsigned long long int
rdtsc()
{
	unsigned long long int x;
	__asm__ volatile(".byte 0x0f, 0x31":"=A" (x));
	return (x);
}
#endif

/* return system frequency in MHz (use divisor=1) or GHz (use divisor=1000) */
void
get_freq_dynamic(char *p_client_buffer, size_t client_buffer_size,
		char *p_format, int divisor)
{
#if  defined(__i386) || defined(__x86_64) 
	struct timezone tz;
	struct timeval tvstart, tvstop;
	unsigned long long cycles[2];	/* gotta be 64 bit */
	unsigned int microseconds;	/* total time taken */

	memset(&tz, 0, sizeof (tz));

	/* get this function in cached memory */
	gettimeofday(&tvstart, &tz);
	cycles[0] = rdtsc();
	gettimeofday(&tvstart, &tz);

	/* we don't trust that this is any specific length of time */
	usleep(100);
	cycles[1] = rdtsc();
	gettimeofday(&tvstop, &tz);
	microseconds = ((tvstop.tv_sec - tvstart.tv_sec) * 1000000) +
		(tvstop.tv_usec - tvstart.tv_usec);

	snprintf(p_client_buffer, client_buffer_size, p_format,
		(float)((cycles[1] - cycles[0]) / microseconds) / divisor);
#else
	get_freq(p_client_buffer, client_buffer_size, p_format, divisor);
#endif
}

/*void*/
char
get_freq(char *p_client_buffer, size_t client_buffer_size,
		char *p_format, int divisor, unsigned int cpu)
{
	int freq = cpu;
	int mib[2] = { CTL_HW, HW_CPUSPEED };
	
	if (!p_client_buffer || client_buffer_size <= 0 ||
			!p_format || divisor <= 0)
		return 0;

	size_t size = sizeof(freq);
	if(sysctl(mib, 2, &freq, &size, NULL, 0) == 0)
		snprintf(p_client_buffer, client_buffer_size,
				p_format, (float)freq/divisor);
	else
		snprintf(p_client_buffer, client_buffer_size, p_format, 0.0f);

	return 1;
}

void
update_top()
{
	proc_find_top(info.cpu, info.memu);
}

void
update_wifi_stats()
{
	struct net_stat * ns;
	struct ifaddrs *ifap, *ifa;
	struct ifmediareq ifmr;
	struct ieee80211_nodereq nr;
	struct ieee80211_bssid bssid;
	int s,ibssid;

	/*
	 * Get iface table
	 */
	if (getifaddrs(&ifap) < 0)
		return;

	for (ifa = ifap; ifa; ifa = ifa->ifa_next) {
		ns = get_net_stat((const char *) ifa->ifa_name);

		s = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);

		/* Get media type */
		bzero(&ifmr, sizeof(ifmr));
		strlcpy(ifmr.ifm_name, ifa->ifa_name, IFNAMSIZ);
		if (ioctl(s, SIOCGIFMEDIA, (caddr_t) &ifmr) < 0)
			goto cleanup;
		
		/*
		 * We can monitor only wireless interfaces
		 * which not in hostap mode
		 */
		if ((ifmr.ifm_active & IFM_IEEE80211) &&
				!(ifmr.ifm_active & IFM_IEEE80211_HOSTAP)) {
			/* Get wi status */

			memset(&bssid, 0, sizeof(bssid));
			strlcpy(bssid.i_name, ifa->ifa_name, sizeof(bssid.i_name));
			ibssid = ioctl(s, SIOCG80211BSSID, &bssid);

			bzero(&nr, sizeof(nr));
			bcopy(bssid.i_bssid, &nr.nr_macaddr, sizeof(nr.nr_macaddr));
			strlcpy(nr.nr_ifname, ifa->ifa_name, sizeof(nr.nr_ifname));

			if (ioctl(s, SIOCG80211NODE, &nr) == 0 && nr.nr_rssi) {
				//if (nr.nr_max_rssi)
				//	printf(" %u%%", IEEE80211_NODEREQ_RSSI(&nr));
				//else 
					ns->linkstatus = nr.nr_rssi;
			}
		}
cleanup:
		close(s);
	}
}
void
update_diskio()
{
	return; /* XXX implement? hifi: not sure how */
}

/*
 * While topless is obviously better, top is also not bad.
 */

int
comparecpu(const void *a, const void *b)
{
	if (((struct process *)a)->amount > ((struct process *)b)->amount)
		return (-1);

	if (((struct process *)a)->amount < ((struct process *)b)->amount)
		return (1);

	return (0);
}

int
comparemem(const void *a, const void *b)
{
	if (((struct process *)a)->totalmem > ((struct process *)b)->totalmem)
		return (-1);

	if (((struct process *)a)->totalmem < ((struct process *)b)->totalmem)
		return (1);

	return (0);
}

inline void
proc_find_top(struct process **cpu, struct process **mem)
{
	struct kinfo_proc2 *p;
	int n_processes;
	int i, j = 0;
	struct process *processes;
	int mib[2];

	int total_pages;
	int pagesize = getpagesize();

	/* we get total pages count again to be sure it is up to date */
	mib[0] = CTL_HW;
	mib[1] = HW_USERMEM;
	size_t size = sizeof(total_pages);
	if(sysctl(mib, 2, &total_pages, &size, NULL, 0) == -1)
		fprintf(stderr, "error reading nmempages\n");

	int max_size = sizeof(struct kinfo_proc2);
	p = kvm_getproc2(kd, KERN_PROC_ALL, 0, max_size, &n_processes);
	processes = malloc(n_processes * sizeof (struct process));


	for (i = 0; i < n_processes; i++) {
		if (!((p[i].p_flag & P_SYSTEM)) &&
				p[i].p_comm != NULL) {
			processes[j].pid = p[i].p_pid;
			processes[j].name =  strdup(p[i].p_comm);
			processes[j].amount = 100.0 *
				p[i].p_pctcpu / FSCALE;
			processes[j].totalmem = (float)(p[i].p_vm_rssize * pagesize /
					(float)total_pages) * 100.0;
			j++;
		}
	}

	qsort(processes, j - 1, sizeof (struct process), comparemem);
	for (i = 0; i < 10; i++) {
		struct process *tmp, *ttmp;

		tmp = malloc(sizeof (struct process));
		tmp->pid = processes[i].pid;
		tmp->amount = processes[i].amount;
		tmp->totalmem = processes[i].totalmem;
		tmp->name = strdup(processes[i].name);

		ttmp = mem[i];
		mem[i] = tmp;
		if (ttmp != NULL) {
			free(ttmp->name);
			free(ttmp);
		}
	}

	qsort(processes, j - 1, sizeof (struct process), comparecpu);
	for (i = 0; i < 10; i++) {
		struct process *tmp, *ttmp;

		tmp = malloc(sizeof (struct process));
		tmp->pid = processes[i].pid;
		tmp->amount = processes[i].amount;
		tmp->totalmem = processes[i].totalmem;
		tmp->name = strdup(processes[i].name);

		ttmp = cpu[i];
		cpu[i] = tmp;
		if (ttmp != NULL) {
			free(ttmp->name);
			free(ttmp);
		}
	}

	for (i = 0; i < j; free(processes[i++].name));
	free(processes);
}

#if	defined(i386) || defined(__i386__) 
#define	APMDEV		"/dev/apm"
#define	APM_UNKNOWN	255

int
apm_getinfo(int fd, void *null)
{
	if (ioctl(fd, APM_IOC_GETPOWER) == -1)
		return (-1);

	return (0);
}

char
*get_apm_adapter()
{
	int fd;
	struct apm_power_info info;
	char *out;

	out  = (char *)calloc(16, sizeof (char));

	fd = open(APMDEV, O_RDONLY);
	if (fd < 0) {
		strncpy(out, "ERR", 16);
		return (out);
	}

	if (apm_getinfo(fd, &info) != 0) {
		close(fd);
		strncpy(out, "ERR", 16);
		return (out);
	}
	close(fd);

	switch (info.ac_state) {
		case APM_AC_OFF:
			strncpy(out, "off-line", 16);
			return (out);
			break;
		case APM_AC_ON:
			if (info.battery_state == APM_BATT_CHARGING) {
				strncpy(out, "charging", 16);
				return (out);
			} else {
				strncpy(out, "on-line", 16);
				return (out);
			}
			break;
		default:
			strncpy(out, "unknown", 16);
			return (out);
			break;
	}
}

char
*get_apm_battery_life()
{
	int fd;
	u_int batt_life;
	struct apm_power_info info;
	char *out;

	out = (char *)calloc(16, sizeof (char));

	fd = open(APMDEV, O_RDONLY);
	if (fd < 0) {
		strncpy(out, "ERR", 16);
		return (out);
	}

	if (apm_getinfo(fd, &info) != 0) {
		close(fd);
		strncpy(out, "ERR", 16);
		return (out);
	}
	close(fd);

	batt_life = info.battery_life;
	if (batt_life <= 100) {
		snprintf(out, 16, "%d%%", batt_life);
		return (out);
	} else
		strncpy(out, "ERR", 16);

	return (out);
}

char
*get_apm_battery_time()
{
	int fd;
	int batt_time;
	int h, m;
	struct apm_power_info info;
	char *out;

	out = (char *)calloc(16, sizeof (char));

	fd = open(APMDEV, O_RDONLY);
	if (fd < 0) {
		strncpy(out, "ERR", 16);
		return (out);
	}

	if (apm_getinfo(fd, &info) != 0) {
		close(fd);
		strncpy(out, "ERR", 16);
		return (out);
	}
	close(fd);

	batt_time = info.minutes_left;

	if (batt_time == -1)
		strncpy(out, "unknown", 16);
	else {
		h = batt_time / 60;
		m = batt_time % 60;
		snprintf(out, 16, "%2d:%02d", h, m);
	}

	return (out);
}

#endif

/* empty stubs so conky links */
int
get_battery_perct(const char *bat)
{
	return (0);
}

int
get_battery_perct_bar(const char *bar)
{
	return (0);
}

void
prepare_update()
{
	return;
}

void update_entropy (void)
{
	return;
}

void
free_all_processes(void)
{
	return;
}

double
get_acpi_temperature(int fd)
{
	return (0);
}

void
get_battery_stuff(char *buf, unsigned int n, const char *bat, int item)
{
	return;
}

int
open_i2c_sensor(const char *dev, const char *type, int n, int *div,
		char *devtype)
{
	return (0);
}

double
get_i2c_info(int *fd, int arg, char *devtype, char *type)
{
	return (0);
}

int
open_acpi_temperature(const char *name)
{
	return (0);
}

void
get_acpi_ac_adapter(char *p_client_buffer, size_t client_buffer_size)
{
	return;
}

void
get_acpi_fan(char *p_client_buffer, size_t client_buffer_size)
{
	return;
}

void
get_adt746x_cpu(char *p_client_buffer, size_t client_buffer_size)
{
	return;
}

void
get_adt746x_fan(char *p_client_buffer, size_t client_buffer_size)
{
	return;
}