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#include "pool.h"
#include "worker.h"
#include "conf.h"
#include "server.h"

#include <stdlib.h>
#include <event.h>
#include <hiredis/adapters/libevent.h>

struct pool *
pool_new(struct worker *w, int count) {

struct pool *p = calloc(1, sizeof(struct pool));

p->count = count;
p->ac = calloc(count, sizeof(redisAsyncContext*));

p->w = w;
p->cfg = w->s->cfg;

return p;
}

static void
pool_on_connect(const redisAsyncContext *ac) {
struct pool *p = ac->data;
int i = 0;

if(!p || ac->err) {
return;
}
/* connected to redis! */

/* add to pool */
for(i = 0; i < p->count; ++i) {
if(p->ac[i] == NULL) {
p->ac[i] = ac;
return;
}
}
}

struct pool_reconnect {
struct event ev;
struct pool *p;

struct timeval tv;
};

static void
pool_can_connect(int fd, short event, void *ptr) {
struct pool_reconnect *pr = ptr;
struct pool *p = pr->p;

(void)fd;
(void)event;

free(pr);

pool_connect(p, 1);
}
static void
pool_schedule_reconnect(struct pool *p) {

struct pool_reconnect *pr = malloc(sizeof(struct pool_reconnect));
pr->p = p;

pr->tv.tv_sec = 0;
pr->tv.tv_usec = 100*1000; /* 0.1 sec*/

evtimer_set(&pr->ev, pool_can_connect, pr);
event_base_set(p->w->base, &pr->ev);
evtimer_add(&pr->ev, &pr->tv);
}



static void
pool_on_disconnect(const redisAsyncContext *ac, int status) {

struct pool *p = ac->data;
int i = 0;
if (status != REDIS_OK) {
/* fprintf(stderr, "Error: %s\n", ac->errstr); */
}

if(p == NULL) { /* no need to clean anything here. */
return;
}

/* remove from the pool */
for(i = 0; i < p->count; ++i) {
if(p->ac[i] == ac) {
p->ac[i] = NULL;
break;
}
}

/* schedule reconnect */
pool_schedule_reconnect(p);
}

/**
* Create new connection.
*/
redisAsyncContext *
pool_connect(struct pool *p, int attach) {

struct redisAsyncContext *ac;
if(p->cfg->redis_host[0] == '/') { /* unix socket */
ac = redisAsyncConnectUnix(p->cfg->redis_host);
} else {
ac = redisAsyncConnect(p->cfg->redis_host, p->cfg->redis_port);
}

if(attach) {
ac->data = p;
} else {
ac->data = NULL;
}

if(ac->err) {
/*
const char err[] = "Connection failed";
slog(s, WEBDIS_ERROR, err, sizeof(err)-1);
*/
/* fprintf(stderr, "Error: %s\n", ac->errstr); */
redisAsyncFree(ac);
pool_schedule_reconnect(p);
return NULL;
}

redisLibeventAttach(ac, p->w->base);
redisAsyncSetConnectCallback(ac, pool_on_connect);
redisAsyncSetDisconnectCallback(ac, pool_on_disconnect);

if (p->cfg->redis_auth) { /* authenticate. */
redisAsyncCommand(ac, NULL, NULL, "AUTH %s", p->cfg->redis_auth);
}
if (p->cfg->database) { /* change database. */
redisAsyncCommand(ac, NULL, NULL, "SELECT %d", p->cfg->database);
}
return ac;
}

const redisAsyncContext *
pool_get_context(struct pool *p) {

int orig = p->cur++;

do {
p->cur++;
p->cur %= p->count;
if(p->ac[p->cur] != NULL) {
return p->ac[p->cur];
}
} while(p->cur != orig);

return NULL;

}
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