#include <limits.h>
#include <stddef.h>
#include <stdlib.h>

#include "generators.h"

static void generate_random(int *buffer, size_t size)
{
	srandom(1);
	for (size_t i = 0; i < size; i++) buffer[i] = random();

	/* compress the values to nice small numbers to make debugging nicer */
#if 0
	int maxcompressed = -1;
	for (size_t compressed = 0; compressed < size; compressed++) {
		size_t minidx = -1;
		for (size_t i = 0; i < size; i++) {
			if (maxcompressed < buffer[i] && (minidx >= size || buffer[i] < buffer[minidx]))
				minidx = i;
		}
		buffer[minidx] = ++maxcompressed;
	}
#endif
}

static void generate_sorted(int *buffer, size_t size)
{
	for (size_t i = 0; i < size; i++) buffer[i] = i;
}

static void generate_reverse(int *buffer, size_t size)
{
	for (size_t i = 0; i < size; i++) buffer[i] = size - i - 1;
}

static void generate_constant(int *buffer, size_t size)
{
	for (size_t i = 0; i < size; i++) buffer[i] = 42;
}

const struct generator generators[] = {
	{ .name = "random",   .func = generate_random   },
	{ .name = "sorted",   .func = generate_sorted   },
	{ .name = "reverse",  .func = generate_reverse  },
	{ .name = "constant", .func = generate_constant },
	{ 0 }
};