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/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright 2013 Olaf Wintermann. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 *   1. Redistributions of source code must retain the above copyright
 *      notice, this list of conditions and the following disclaimer.
 *
 *   2. Redistributions in binary form must reproduce the above copyright
 *      notice, this list of conditions and the following disclaimer in the
 *      documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

#include <stdio.h>
#include <stdlib.h>

#include "../util/atomic.h"

#include "event_bsd.h"

event_handler_t* evhandler_create(int numthreads) {
    event_handler_t *ev = malloc(sizeof(event_handler_t));
    if(ev == NULL) {
        return NULL;
    }
    
    ev->ports = calloc(numthreads, sizeof(int));
    if(ev->ports == NULL) {
        free(ev);
        return NULL;
    }
    ev->nports = numthreads;
    ev->lp = 0;
    
    /* create ports event threads */
    for(int i=0;i<numthreads;i++) {
        /* create port */
        //ev->ports[i] = port_create();
        ev->ports[i] = kqueue();
        if(ev->ports[i] == 0) {
            free(ev->ports);
            free(ev);
            return NULL;
        }
        
        /*
         * start a new handler thread
         * the thread needs the event port and a pointer to the event handler
         */
        ev_thr_conf_t *conf = malloc(sizeof(ev_thr_conf_t));
        if(conf == NULL) {
            free(ev->ports);
            free(ev);
            return NULL;
        }
        conf->handler = ev;
        conf->port = ev->ports[i];
        
        systhread_start(0, 0, (thrstartfunc)ev_handle_events, conf);
        /* TODO: error handling */
    }
    
    return ev;
}

void ev_handle_events(ev_thr_conf_t *conf) {
    event_handler_t *ev = conf->handler;
    int kq = conf->port;
    
    free(conf);
    
    struct timespec timeout;
    timeout.tv_nsec = 0;
    timeout.tv_sec = 600;
    
    struct kevent events[16];
    
    for(;;) {
        // wait for events
        int nev;
        nev = kevent(kq, NULL, 0, events, 16, &timeout);
        if(nev == -1) {
            // TODO: check for error
            perror("kevent");
            continue;
        }
        
        for(int i=0;i<nev;i++) {
            event_t *event = (event_t*)events[i].udata;
            if(event->fn) {
                if(event->fn(ev, event)) {
                    // TODO: reassociate?               
                } else if(event->finish) {
                    event->finish(ev, event);
                }
            }
        }
    }
}

/* returns a event handler port */
int ev_get_port(event_handler_t *h) {
    int nps = h->nports;
    if(nps == 1) {
        return h->ports[0];
    }
    
    int cp = h->lp % nps;
    ws_atomic_inc32(&h->lp);
    
    return h->ports[cp];
}

int ev_pollin(event_handler_t *h, int fd, event_t *event) {
    struct kevent kev;
    EV_SET(&kev, fd, EVFILT_READ, EV_ADD, 0, 0, event);
    return kevent(ev_get_port(h), &kev, 1, NULL, 0, NULL);
}

int ev_pollout(event_handler_t *h, int fd, event_t *event) {
    struct kevent kev;
    EV_SET(&kev, fd, EVFILT_WRITE, EV_ADD, 0, 0, event);
    return kevent(ev_get_port(h), &kev, 1, NULL, 0, NULL);
}

int evt_send(event_handler_t *h, event_t *event) {
    return 0;
}