#include <stdint.h>
#include <stdlib.h>
#include <string.h>

#include <bitops.h>
#include <flash.h>

#include <fs/mufs.h>

struct mufs_super {
	char magic[4];
	uint32_t nblocks;
	uint32_t file_size;
	uint32_t root;
	uint8_t depth;
} __attribute__((packed));

int mufs_mount(struct mufs *fs, struct flash_dev *dev)
{
	struct mufs_super super;

	if (!fs || !dev)
		return -1;

	if (flash_read(dev, 0, &super, sizeof super) == 0)
		return -1;

	if (memcmp(super.magic, "mufs", 4) != 0)
		return -1;

	fs->dev = dev;
	fs->nblocks = super.nblocks;
	fs->log2_nentries = fs->dev->log2_block_size - ilog2(sizeof(uint32_t));

	fs->root.file_size = super.file_size;
	fs->root.root = super.root;
	fs->root.depth = super.depth;

	return 0;
}

int mufs_format(struct flash_dev *dev)
{
	struct mufs_super super;

	memcpy(super.magic, "mufs", 4);
	super.nblocks = flash_get_capacity(dev) >> dev->log2_block_size;

	super.file_size = 0;
	super.root = 0;
	super.depth = 0;

	if (flash_write(dev, 0, &super, sizeof super) == 0)
		return -1;

	return 0;
}