enum e_anum
{
    e_anim_idle,
    e_anim_attack,
    e_anim_count,
};

struct s_anim_data
{
    b8 loop;
    int sprite_count;
    float duration;
    s_v2i sprite_indices[16];
};

local_persist s_anim_data g_anim_data[] =  {
    {
        .loop = true,
        .sprite_count = 5,
        .duration = 0.5f,
        .sprite_indices = {
            v2i(6, 4), v2i(7, 4), v2i(8, 4), v2i(9, 4), v2i(10, 4)
        },
    },
    {
        .sprite_count = 4,
        // .duration = 0.5f,
        .sprite_indices = {
            v2i(6, 5), v2i(7, 5), v2i(8, 5), v2i(9, 5)
        },
    },
};

struct s_anim
{
    float time;

    int get_index(int anim)
    {
        float percent = time / g_anim_data[anim].duration;
        int index = roundfi(percent * (g_anim_data[anim].sprite_count - 1));
        return index;
    }

    void update(int anim)
    {
        time += delta;
        if(time > g_anim_data[anim].duration)
        {
            if(g_anim_data[anim].loop) { time = 0; }
            else { time = 1; }
        }
    }
};

struct s_hero
{
    float attack_time;
    int anim;
    s_anim anims[e_anim_count];
};

local_persist s_hero hero = zero;

constexpr float attack_delay = 0.2f;

delta = 1.0f/60.0f;

hero.attack_time = at_most(attack_delay + delta, hero.attack_time + delta);

local_persist s_v2 proj = zero;
local_persist s_v2 proj_dir = v2(1, 0);
local_persist s_v2 hero_pos = c_world_center;


while(v2_distance(input->mouse, c_world_center) < 600 && hero.attack_time >= attack_delay)
{
    hero.attack_time -= attack_delay;

    proj = hero_pos;
    proj_dir = v2_normalized(input->mouse - proj);

    // attack
    hero.anim = e_anim_attack;
}

hero.anims[hero.anim].update(hero.anim);

int index;
if(hero.anim == e_anim_attack)
{
    ui_label("ATTACK", v2(c_world_center.x, 300));
    float percent = hero.attack_time / attack_delay;
    index = roundfi(percent * (g_anim_data[hero.anim].sprite_count - 1));
    if(percent >= 1)
    {
        hero.anim = e_anim_idle;
        index = 0;
    }
}
else
{
    ui_label("IDLE", v2(c_world_center.x, 300));
    index = hero.anims[hero.anim].get_index(hero.anim);
}

draw_texture_ui(
    e_texture_atlas,
    hero_pos,
    e_z_index_ui0,
    v2(256, 256),
    color(1).rgb,
    g_anim_data[hero.anim].sprite_indices[index],
    origin_center
);

draw_texture_ui(
    e_texture_atlas,
    proj,
    e_z_index_ui0,
    v2(128, 128),
    color(1).rgb,
    v2i(7, 8),
    origin_center
);

proj += proj_dir * delta * 800;