#include "fsctl/fugue/cluster.h"
#include "fsctl/fugue/sector.h"
#include "fsctl/fugue/utils.h"

//---
// Public
//---

/* fugue_cluster_is_valid() : check cluster validity */
//TODO : support FAT12 / FAT32
int fugue_cluster_is_valid(fugue_fs_t *fs, int cluster_idx)
{
    void *sector;
    uint16_t id;

    id = FAT_WORD(((uint16_t *)fs->_private.fat0)[cluster_idx]);
    if (id == 0x0000)
        return 0;
    if (cluster_idx == 0)
        return 0;

    /* special check for the root fake cluster */
    if (cluster_idx == 1)
    {
        if (id != 0xffff)
            return -1;
        return 0;
    }

    cluster_idx -= 2;
    sector = (void*)((uintptr_t)(fs->props.cluster_nb_sector * cluster_idx));
    sector = (void*)((uintptr_t)sector + fs->props.sector_root_nb);
    sector = (void*)((uintptr_t)sector * 512);
    sector = (void*)((uintptr_t)sector + (uintptr_t)fs->_private.root);

    for (int i = 0 ; i < fs->props.cluster_nb_sector ; i++)
    {
        if (fugue_sector_is_invalid(sector))
            return -2;
        sector = (void *)((uintptr_t)sector + 512);
    }
    return 0;
}