/*
 * Tuxánci 2 - A first person shooter
 * Copyright (C) 2025-2026  Connor Thomson
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <https://www.gnu.org/licenses/>.
 */

#include "ta_sdl.h"
#include "keyboard.h"
#include <stdlib.h>
#include <string.h>

static ta_key_callback_fn *ta_keyboard_callbacks = NULL;
static int ta_keyboard_callbacks_capacity = 0;

static int ta_keyboard_ensure_capacity(int key) {
    if (key < ta_keyboard_callbacks_capacity) {
        return 1;
    }

    int new_capacity = ta_keyboard_callbacks_capacity;
    while (new_capacity <= key) {
        new_capacity += sizeof(SDLK_UNKNOWN);
    }

    ta_key_callback_fn *new_array = realloc(
        ta_keyboard_callbacks,
        (size_t)new_capacity * sizeof(ta_key_callback_fn)
    );
    if (new_array == NULL) {
        return 0;
    }

    memset(
        new_array + ta_keyboard_callbacks_capacity,
        0,
        (size_t)(new_capacity - ta_keyboard_callbacks_capacity) * sizeof(ta_key_callback_fn)
    );

    ta_keyboard_callbacks = new_array;
    ta_keyboard_callbacks_capacity = new_capacity;
    return 1;
}

void ta_keyboard_set_callback(int key, void (*callback)(void)) {
    if (key < 0 || !ta_keyboard_ensure_capacity(key)) {
        return;
    }
    ta_keyboard_callbacks[key] = callback;
}

void ta_keyboard_dispatch(int key) {
    if (key < 0) {
        return;
    }

    if (key < ta_keyboard_callbacks_capacity && ta_keyboard_callbacks[key] != NULL) {
        ta_keyboard_callbacks[key]();
    }
}

void ta_keyboard_shutdown(void) {
    if (ta_keyboard_callbacks) {
        free(ta_keyboard_callbacks);
    }

    ta_keyboard_callbacks = NULL;
    ta_keyboard_callbacks_capacity = 0;
}