/*
   Kitsune's Curse
   Copyright (C) 2020-2023 Juan J. Martinez <jjm@usebox.net>

   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 "splib.h"
#include "plw.h"
#include "sound.h"
#include "main.h"

#include "maps.h"

// generated
#include "spider.h"

#include "entities.h"
#include "et_spider.h"
#include "et_player.h"

void draw_spider()
{
    if (!*it_frame)
        put_sprite4(spider[1], *it_x, *it_y, 1, 0);
    else
    {
        // draws the thread
        if (!(*it_param & 128))
            it_k = *it_param & 127;
        else
            it_k = *it_extra - (*it_param & 127);

        it_k >>= 3;
        while (it_k)
        {
            put_sprite4(spider[2], *it_x, *it_y - (it_k << 3), 1, 0);
            --it_k;
        }

        put_sprite4(spider[0], *it_x, *it_y, 2, 0);
        erase_sprite(*it_ox, *it_oy, 2);
    }
}

void update_spider()
{
    // waiting
    if (!*it_frame)
    {
        if (!magic && life && py > *it_y && abs_sub(*it_x, px) < 9 && abs_sub(*it_y, py) < 48)
        {
            *it_frame = 1;
            PLW_PlaySoundEffectP(EFX_SPIDER);
        }
        else
            return;
    }

    // limit and change direction
    if ((*it_param & 127) == *it_extra)
    {
        // back up
        if (*it_param & 128)
        {
            erase_sprite(*it_x, *it_y + 8, 1);
            *it_frame = 0;
            *it_param = 0;
            goto spider_done;
        }
        else
            // touch bottom
            *it_param = 128;
    }

    if (*it_param & 128)
    {
        *it_y -= 1;
        *it_param += 1;
    }
    else
    {
        *it_y += 8;
        *it_param += 8;
    }

spider_done:

    // only going down
    if (!(*it_param & 128) && check_for_player(16))
        player_hit(1);
}