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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 <SDL_stdinc.h>
#include <assert.h>
struct Stack {
Uint8 len;
Sint8 cards[52];
};
static inline void stackClear(struct Stack *stack) {
stack->len = 0;
}
static inline void stackPush(struct Stack *stack, Sint8 card) {
assert(stack->len < 52);
stack->cards[stack->len++] = card;
}
static inline Sint8 stackPop(struct Stack *stack) {
if (!stack->len) return 0;
return stack->cards[--stack->len];
}
static inline void stackFlipTo(struct Stack *dst, struct Stack *src, Uint8 n) {
if (n > src->len) n = src->len;
for (Uint8 i = 0; i < n; ++i) {
stackPush(dst, -stackPop(src));
}
}
static inline void stackMoveTo(struct Stack *dst, struct Stack *src, Uint8 n) {
if (n > src->len) n = src->len;
for (Uint8 i = 0; i < n; ++i) {
stackPush(dst, src->cards[src->len - n + i]);
}
src->len -= n;
}
static inline void stackDeck(struct Stack *stack) {
stackClear(stack);
for (Sint8 i = 1; i <= 52; ++i) {
stackPush(stack, -i);
}
}
// FIXME: Use a portable random.
static inline void stackShuffle(struct Stack *stack) {
for (Uint8 i = stack->len - 1; i > 0; --i) {
Uint8 j = arc4random_uniform(i + 1);
Sint8 x = stack->cards[i];
stack->cards[i] = stack->cards[j];
stack->cards[j] = x;
}
}
#endif
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