/*
   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 <string.h>

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

#include "maps.h"

// generated
#include "demon.h"
#include "fireball.h"

#include "entities.h"
#include "et_demon.h"
#include "et_player.h"

static const struct st_entity base = {
    ET_EXPLO,
    0, 0, 0, 0, 0, 0, 0,
    0, // param
    0, // extra
    update_fireball,
    draw_fireball,
    0
};

void draw_fireball()
{
    put_sprite4(fireball[player_frames[*it_frame]], *it_x, *it_y, 1, 0);
    erase_sprite(*it_ox, *it_oy, 1);
}

void update_fireball()
{
    if ((*it_delay)++ == 1)
    {
        *it_delay = 0;
        if (++(*it_frame) > WALK_CYCLE)
            *it_frame = WALK;
    }

    if (*it_param)
    {
        if (is_map_blocked(*it_x + 11, *it_y + 8)
                || *it_x > TW * TMW - 8 - 4)
            goto fireball_done;
        else
            *it_x += 2;
    }
    else
    {
        if (is_map_blocked(*it_x - 4, *it_y + 8)
                || *it_x < 4)
            goto fireball_done;
        else
            *it_x -= 2;
    }

    if (check_for_player(8))
    {
        player_hit(2);
fireball_done:
        erase_sprite(*it_ox, *it_oy, 1);
        destroy_entity();
    }
}

void new_fireball()
{
    if (!new_entity())
        return;

    memcpy(sp_new, &base, sizeof(base) - 2);
    if (*it_param)
        sp_new->x = *it_x + 8;
    else
        sp_new->x = *it_x - 8;
    sp_new->param = *it_param;
    sp_new->y = *it_y + 8;

    PLW_PlaySoundEffectP(EFX_MAGIC);
}

void draw_demon()
{
    put_sprite4(demon[player_frames[*it_frame]], *it_x, *it_y, 3, *it_param & 128);
    erase_sprite(*it_ox, *it_oy, 3);
}

void update_demon()
{
    if ((*it_delay)++ == 2 || *it_delay == 11)
    {
        *it_delay = 0;
        if (++(*it_frame) > WALK_CYCLE)
            *it_frame = WALK;
    }

    if (*it_extra < 72)
        *it_extra += 1;
    else if (abs_sub(py, *it_y) < 8 &&
             (*it_param && px > *it_x || !*it_param && px < *it_x))
    {
        new_fireball();
        *it_extra = 0;

        *it_frame = WALK_CYCLE;
        *it_delay = 3;
    }

    if (*it_param)
    {
        if (is_map_blocked(*it_x + 11, *it_y + 8)
                || !is_map_blocked(*it_x + 11, *it_y + 24)
                || *it_x > TW * TMW - 8 - 4)
            goto demon_change_dir;
        else
            *it_x += 1;
    }
    else
    {
        if (is_map_blocked(*it_x - 4, *it_y + 8)
                || !is_map_blocked(*it_x - 4, *it_y + 24)
                || *it_x < 4)
            goto demon_change_dir;
        else
            *it_x -= 1;
    }

    if (check_for_player(24))
    {
        player_hit(1);
demon_change_dir:
        *it_param ^= 128;
        *it_delay = 0;
        *it_frame = WALK;
    }
}