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/* Copyright (C) 2019 C. McEnroe <june@causal.agency>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero 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 Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef STACK_H
#define STACK_H
#include <assert.h>
#include <stdlib.h>
#include <SDL_stdinc.h>
#include <cards.h>
#ifndef STACK_CAP
#define STACK_CAP 52
#endif
#if STACK_CAP < 52
#error "Stack capacity too small for deck"
#endif
typedef Sint8 Card;
static inline int suit(Card card) {
card = abs(card);
if (card > Cards_Spade) {
return Cards_Spade;
} else if (card > Cards_Heart) {
return Cards_Heart;
} else if (card > Cards_Diamond) {
return Cards_Diamond;
} else {
return Cards_Club;
}
}
static inline int color(Card card) {
return suit(card) == Cards_Diamond || suit(card) == Cards_Heart;
}
static inline int rank(Card card) {
return abs(card) - suit(card);
}
struct Stack {
Uint8 len;
Card cards[STACK_CAP];
};
static const struct Stack Deck = {
.len = 52,
.cards = {
-1, -2, -3, -4, -5, -6, -7, -8, -9, -10, -11, -12, -13,
-14, -15, -16, -17, -18, -19, -20, -21, -22, -23, -24, -25, -26,
-27, -28, -29, -30, -31, -32, -33, -34, -35, -36, -37, -38, -39,
-40, -41, -42, -43, -44, -45, -46, -47, -48, -49, -50, -51, -52,
},
};
static inline void clear(struct Stack *stack) {
stack->len = 0;
}
static inline void push(struct Stack *stack, Card card) {
assert(stack->len < STACK_CAP);
stack->cards[stack->len++] = card;
}
static inline Card pop(struct Stack *stack) {
if (!stack->len) return 0;
return stack->cards[--stack->len];
}
static inline Card peek(const struct Stack *stack) {
if (!stack->len) return 0;
return stack->cards[stack->len - 1];
}
static inline void flipTo(struct Stack *dst, struct Stack *src, Uint8 n) {
if (n > src->len) n = src->len;
for (Uint8 i = 0; i < n; ++i) {
push(dst, -pop(src));
}
}
static inline void moveTo(struct Stack *dst, struct Stack *src, Uint8 n) {
if (n > src->len) n = src->len;
for (Uint8 i = 0; i < n; ++i) {
push(dst, src->cards[src->len - n + i]);
}
src->len -= n;
}
static inline int randUniform(int bound) {
for (;;) {
int r = rand();
if (r >= RAND_MAX % bound) return r % bound;
}
}
static inline void shuffle(struct Stack *stack) {
for (Uint8 i = stack->len - 1; i > 0; --i) {
Uint8 j = randUniform(i + 1);
Card x = stack->cards[i];
stack->cards[i] = stack->cards[j];
stack->cards[j] = x;
}
}
#endif
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