src/behavior.c

/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 * Copyright 2025 Mike Becker. 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 "ascension/behavior.h"
#include "ascension/context.h"
#include "ascension/scene.h"
#include "ascension/util.h"
#include "ascension/error.h"

#include <cx/array_list.h>
#include <cx/tree.h>

#include <assert.h>

static void asc_behavior_destroy(void *b) {
    AscBehavior *behavior = b;
    asc_dprintf("Destroy behavior: %"CX_PRIstr, CX_SFMT(behavior->name));
    cx_strfree(&behavior->name);
    if (behavior->destroy_func) {
        behavior->destroy_func(behavior);
    }
}

static CxList *asc_behavior_new_list(void) {
    CxList *list = cxArrayListCreate(NULL, NULL, sizeof(AscBehavior), 4);
    cxDefineDestructor(list, asc_behavior_destroy);
    return list;
}

AscBehavior *asc_behavior_add_(AscSceneNode *node, struct asc_behavior_create_args args) {
    if (node->behaviors == NULL) {
        node->behaviors = asc_behavior_new_list();
    }
    AscBehavior *behavior = cxListEmplace(node->behaviors);
    assert(behavior != NULL);
    behavior->enabled = true;
    behavior->killed = false;
    behavior->node = node;
    behavior->func = args.func;
    behavior->destroy_func = args.destroy_func;
    behavior->data = args.data;
    behavior->interval = args.interval;
    behavior->last_execution = 0;
    asc_behavior_name(behavior, args.name);
    asc_dprintf("Create behavior: %"CX_PRIstr, CX_SFMT(behavior->name));
    return behavior;
}

void asc_behavior_remove(AscBehavior *behavior) {
    // TODO: implement some sort of ID for behaviors which can also be used for logging
    behavior->killed = true;
    behavior->enabled = false;
}

void asc_behavior_trigger(AscBehavior *behavior) {
    assert(behavior->enabled);
    if (behavior->last_execution + behavior->interval > asc_context.total_nanos) return;

    behavior->func(behavior);
    behavior->last_execution = asc_context.total_nanos;
}

void asc_behavior_name(AscBehavior *behavior, const char *name) {
    cx_strfree(&behavior->name);
    if (name == NULL) {
        behavior->name = asc_util_gen_name(behavior, "behavior");
    } else {
        behavior->name.ptr = strdup(name);
        behavior->name.length = strlen(name);
    }
}