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Hearts: Let the AI prefer lead cards for which other cards are in play

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When picking a lead card the AI should avoid playing cards where it
knows that no other player has a lower value card of the same type.
This commit is contained in:
Gunnar Beutner 2021-05-23 14:49:58 +02:00 • committed by Andreas Kling
parent 647d0f9f8a
commit 2dfced2501
3 changed files with 19 additions and 5 deletions
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17
Userland/Games/Hearts/Player.cpp
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@ -11,7 +11,8 @@
namespace Hearts {
size_t Player::pick_lead_card(Function<bool(Card&)> valid_play, Function<bool(Card&)> prefer_card)
size_t Player::pick_lead_card(Function<bool(Card&)> valid_play, Function<bool(Card&)> prefer_card,
Function<bool(Card&)> lower_value_card_in_play)
{
struct CardWithIndex {
RefPtr<Card> card;
@ -38,17 +39,27 @@ size_t Player::pick_lead_card(Function<bool(Card&)> valid_play, Function<bool(Ca
dbgln("----");
}
size_t last_index = -1;
ssize_t fallback_index = -1;
ssize_t last_index = -1;
for (auto& cwi : sorted_hand) {
if (!valid_play(*cwi.card))
continue;
if (lower_value_card_in_play(*cwi.card)) {
// Allow falling back to this card if no other suitable card is in play.
fallback_index = cwi.index;
continue;
}
if (prefer_card(*cwi.card)) {
dbgln_if(HEARTS_DEBUG, "Preferring card {}", *cwi.card);
return cwi.index;
}
last_index = cwi.index;
}
return last_index;
if (last_index == -1) {
dbgln_if(HEARTS_DEBUG, "Falling back to card {}", *hand[fallback_index]);
return fallback_index;
} else
return last_index;
}
Optional<size_t> Player::pick_low_points_high_value_card(Optional<Card::Type> type)