assets.py

import os
import pygame

from models import Card
from settings import CARD_RADIUS, CARD_W, CARD_H


def apply_rounded_corners(img: pygame.Surface, radius: int) -> pygame.Surface:
    img = img.convert_alpha()
    w, h = img.get_size()

    mask = pygame.Surface((w, h), pygame.SRCALPHA)
    pygame.draw.rect(mask, (255, 255, 255, 255), (0, 0, w, h), border_radius=radius)

    out = pygame.Surface((w, h), pygame.SRCALPHA)
    out.blit(img, (0, 0))
    out.blit(mask, (0, 0), special_flags=pygame.BLEND_RGBA_MULT)
    return out


def load_deck_from_folder_unique(folder="cards") -> list[Card]:
    if not os.path.isdir(folder):
        raise FileNotFoundError("Missing 'cards' folder. Put your PNG cards in ./cards")

    deck = []
    for f in os.listdir(folder):
        if f.lower().endswith(".png") and f.lower() != "back.png":
            deck.append(Card(f))

    if len(deck) < 20:
        raise RuntimeError("No card images found (except back.png). Check ./cards")
    return deck


def load_images_scaled(folder="cards") -> tuple[dict[str, pygame.Surface], pygame.Surface]:
    images = {}
    back_img = None

    for f in os.listdir(folder):
        if not f.lower().endswith(".png"):
            continue

        path = os.path.join(folder, f)
        img = pygame.image.load(path).convert_alpha()
        img = pygame.transform.smoothscale(img, (CARD_W, CARD_H))
        img = apply_rounded_corners(img, CARD_RADIUS)

        if f.lower() == "back.png":
            back_img = img
        else:
            images[f] = img

    if not images:
        raise RuntimeError("No card images found in ./cards")

    if back_img is None:
        back_img = next(iter(images.values()))

    return images, back_img