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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"

EVHandler* evhandler_create(EventHandlerConfig *cfg) {
    EVHandler *ev = malloc(sizeof(EVHandler));
    ev->current = 0;
    ev->instances = calloc(cfg->nthreads, sizeof(void*));
    ev->numins = cfg->nthreads;
    
    for(int i=0;i<cfg->nthreads;i++) {
        EventHandler *handler = malloc(sizeof(EventHandler));
        ev->instances[i] = handler;
        
        handler->kqueue = kqueue();
        if(handler->kqueue == 0) {
            // TODO: error
            return NULL;
        }
        
        SYS_THREAD t = systhread_start(
                0,
                0,
                (thrstartfunc)ev_handle_events,
                handler);
        systhread_detach(t);
    }
    
    return ev;
}


void ev_handle_events(EventHandler *ev) {
    struct timespec timeout;
    timeout.tv_nsec = 0;
    timeout.tv_sec = 600;
    
    struct kevent events[64];
    struct kevent changes[64];
    int numchanges = 0;
    
    for(;;) {
        // wait for events
        int nev = kevent(ev->kqueue, changes, numchanges, events, 64, &timeout);
        if(nev == -1) {
            // TODO: check for error
            perror("kevent");
            continue;
        }
        
        numchanges = 0;
        for(int i=0;i<nev;i++) {
            Event *event = (Event*)events[i].udata;
            if(event->fn) {
                int ep = event->events;
                if(event->fn(ev, event)) {
                    if(event->events != ep) {
                        changes[numchanges++].filter = ev_convert2sys_events(ep);
                    }
                } else if(event->finish) {
                    changes[numchanges++].filter = ev_convert2sys_events(ep);
                    event->finish(ev, event);
                }
            }
        }
    }
}

int ev_convert2sys_events(int events) {
    int e = 0;
    if((events & EVENT_POLLIN) == EVENT_POLLIN) {
        e |= EVFILT_READ;
    }
    if((events & EVENT_POLLOUT) == EVENT_POLLOUT) {
        e |= EVFILT_WRITE;
    }
    return e;
}

int ev_pollin(EventHandler *h, int fd, Event *event) {
    event->events = EVENT_POLLIN;
    struct kevent kev;
    EV_SET(&kev, fd, EVFILT_READ, EV_ADD, 0, 0, event);
    return kevent(h->kqueue, &kev, 1, NULL, 0, NULL);
}

int ev_pollout(EventHandler *h, int fd, Event *event) {
    event->events = EVENT_POLLOUT;
    struct kevent kev;
    EV_SET(&kev, fd, EVFILT_WRITE, EV_ADD, 0, 0, event);
    return kevent(h->kqueue, &kev, 1, NULL, 0, NULL);
}

int event_send(EventHandler *h, Event *event) {
    return 0;
}