#include "dice.h"
#include <stdlib.h>
#include <memory.h>

int roll_die(enum die_type die) {
	int const max = die - 1;
	return (rand() % max) + 1;
}

static int current_active_count = 0;
static enum die_type active_dice_set[MAX_ACTIVE_DICE];

enum die_type const *get_active_dice_set(size_t *out_length) {
	if (out_length != nullptr) {
		*out_length = current_active_count;
	}
	return active_dice_set;
}

size_t add_die_to_active(enum die_type die) {
	if (current_active_count >= MAX_ACTIVE_DICE) {
		return MAX_ACTIVE_DICE;
	}
	active_dice_set[current_active_count] = die;
	return current_active_count++;
}

void remove_die_from_active(size_t index) {
	memmove(active_dice_set + index + 1, active_dice_set + index, MAX_ACTIVE_DICE - index - 1);
}

struct roll_result_type roll_active_dice_set(enum die_type die) {
	struct roll_result_type results = {
		.individual_result_count = MAX_ACTIVE_DICE,
		.total = 0
	};
	for (size_t i = 0; i < current_active_count; ++i) {
		results.individual_results[i] = roll_die(active_dice_set[i]);
		results.total += results.individual_results[i];
	}

	return results;
}