/*-
 * Copyright (c) 2005 Michael Bushkov <bushman@rsu.ru>
 * 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 AUTHOR 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 AUTHOR 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 <sys/cdefs.h>
#include <assert.h>
#include <stdlib.h>
#include <string.h>

#include "agent.h"
#include "debug.h"

static int
agent_cmp_func(const void *a1, const void *a2)
{
        struct agent const *ap1 = *((struct agent const **)a1);
        struct agent const *ap2 = *((struct agent const **)a2);
        int res;

        res = strcmp(ap1->name, ap2->name);
        if (res == 0) {
                if (ap1->type == ap2->type)
                        res = 0;
                else if (ap1->type < ap2->type)
                        res = -1;
                else
                        res = 1;
        }

        return (res);
}

struct agent_table *
init_agent_table(void)
{
        struct agent_table      *retval;

        TRACE_IN(init_agent_table);
        retval = calloc(1, sizeof(*retval));
        assert(retval != NULL);

        TRACE_OUT(init_agent_table);
        return (retval);
}

void
register_agent(struct agent_table *at, struct agent *a)
{
        struct agent **new_agents;
        size_t new_agents_num;

        TRACE_IN(register_agent);
        assert(at != NULL);
        assert(a != NULL);
        new_agents_num = at->agents_num + 1;
        new_agents = malloc(sizeof(*new_agents) *
                new_agents_num);
        assert(new_agents != NULL);
        memcpy(new_agents, at->agents, at->agents_num * sizeof(struct agent *));
        new_agents[new_agents_num - 1] = a;
        qsort(new_agents, new_agents_num, sizeof(struct agent *),
                agent_cmp_func);

        free(at->agents);
        at->agents = new_agents;
        at->agents_num = new_agents_num;
        TRACE_OUT(register_agent);
}

struct agent *
find_agent(struct agent_table *at, const char *name, enum agent_type type)
{
        struct agent **res;
        struct agent model, *model_p;

        TRACE_IN(find_agent);
        model.name = (char *)name;
        model.type = type;
        model_p = &model;
        res = bsearch(&model_p, at->agents, at->agents_num,
                sizeof(struct agent *), agent_cmp_func);

        TRACE_OUT(find_agent);
        return ( res == NULL ? NULL : *res);
}

void
destroy_agent_table(struct agent_table *at)
{
        size_t i;

        TRACE_IN(destroy_agent_table);
        assert(at != NULL);
        for (i = 0; i < at->agents_num; ++i) {
                free(at->agents[i]->name);
                free(at->agents[i]);
        }

        free(at->agents);
        free(at);
        TRACE_OUT(destroy_agent_table);
}