use kings_eunuch::game_engine::Deck;

#[test]
fn test_new_deck_has_52_cards() {
    let deck = Deck::new();
    assert_eq!(deck.remaining(), 52);
}

#[test]
fn test_default_creates_52_cards() {
    let deck = Deck::default();
    assert_eq!(deck.remaining(), 52);
}

#[test]
fn test_deal_single_card() {
    let mut deck = Deck::new();
    let _card = deck.deal();
    assert_eq!(deck.remaining(), 51);
}

#[test]
fn test_deal_multiple() {
    let mut deck = Deck::new();
    let cards = deck.deal_multiple(5);
    assert_eq!(cards.len(), 5);
    assert_eq!(deck.remaining(), 47);
}

#[test]
fn test_shuffle_changes_order() {
    // Create two decks - one shuffled, one not
    let mut deck1 = Deck::new();
    let mut deck2 = Deck::new();
    deck2.shuffle_cards();

    // Deal all cards from both and compare order
    let cards1 = deck1.deal_multiple(52);
    let cards2 = deck2.deal_multiple(52);

    // Probability of same order is 1/52! (astronomically small)
    assert_ne!(cards1, cards2, "Shuffled deck should have different order");
}