#include "disk.h"
#include "common/mallocHelper.h"
#include "common/strutil.h"

#include <stdalign.h>
#include <sys/mount.h>
#include <sys/stat.h>

#ifdef __NetBSD__
    #include <sys/types.h>
    #include <sys/statvfs.h>
    #define statfs statvfs
    #define f_flags f_flag
    #define f_bsize f_frsize
#endif

#ifdef __FreeBSD__
    #if __has_include(<libgeom.h>)
        #include <libgeom.h>

static const char* detectFsLabel(struct statfs* fs, FFDisk* disk) {
    if (!ffStrStartsWith(fs->f_mntfromname, "/dev/")) {
        return "Only block devices are supported";
    }

    // Detect volume label in geom tree
    static struct gmesh geomTree;
    static struct gclass* cLabels;
    if (!cLabels) {
        if (geomTree.lg_ident) {
            return "Previous geom_gettree() failed";
        }

        if (geom_gettree(&geomTree) < 0) {
            geomTree.lg_ident = (void*) (intptr_t) -1;
            return "geom_gettree() failed";
        }

        for (cLabels = geomTree.lg_class.lh_first; cLabels && !ffStrEquals(cLabels->lg_name, "LABEL"); cLabels = cLabels->lg_class.le_next);
        if (!cLabels) {
            return "Class LABEL is not found";
        }
    }

    for (struct ggeom* label = cLabels->lg_geom.lh_first; label; label = label->lg_geom.le_next) {
        struct gprovider* provider = label->lg_provider.lh_first;
        if (!provider || !ffStrEquals(label->lg_name, fs->f_mntfromname + strlen("/dev/"))) {
            continue;
        }
        const char* str = strchr(provider->lg_name, '/');
        ffStrbufSetS(&disk->name, str ? str + 1 : provider->lg_name);
    }

    return NULL;
}
    #else
static const char* detectFsLabel(FF_A_UNUSED struct statfs* fs, FF_A_UNUSED FFDisk* disk) {
    return "Fastfetch was compiled without libgeom support";
}
    #endif

static void detectFsInfo(struct statfs* fs, FFDisk* disk) {
    if (ffStrbufEqualS(&disk->filesystem, "zfs")) {
        disk->type = !ffStrbufStartsWithS(&disk->mountFrom, "zroot/") || ffStrbufStartsWithS(&disk->mountFrom, "zroot/ROOT/")
            ? FF_DISK_VOLUME_TYPE_REGULAR_BIT
            : FF_DISK_VOLUME_TYPE_SUBVOLUME_BIT;
    } else if (fs->f_flags & MNT_IGNORE) {
        disk->type = FF_DISK_VOLUME_TYPE_HIDDEN_BIT;
    } else if (!(fs->f_flags & MNT_LOCAL)) {
        disk->type = FF_DISK_VOLUME_TYPE_EXTERNAL_BIT;
    } else {
        disk->type = FF_DISK_VOLUME_TYPE_REGULAR_BIT;
    }

    detectFsLabel(fs, disk);
}
#elif __APPLE__
    #include "common/apple/cf_helpers.h"

    #include <sys/attr.h>
    #include <unistd.h>

    #ifndef MAC_OS_X_VERSION_10_15
        #define MNT_REMOVABLE 0x00000200
    #endif

struct CmnAttrBuf {
    uint32_t length;
    attrreference_t nameRef;
    char nameSpace[NAME_MAX * 3 + 1];
} FF_A_PACKED;

void detectFsInfo(struct statfs* fs, FFDisk* disk) {
    if (fs->f_flags & MNT_DONTBROWSE) {
        disk->type = FF_DISK_VOLUME_TYPE_HIDDEN_BIT;
    } else if (fs->f_flags & MNT_REMOVABLE || !(fs->f_flags & MNT_LOCAL)) {
        disk->type = FF_DISK_VOLUME_TYPE_EXTERNAL_BIT;
    } else {
        disk->type = FF_DISK_VOLUME_TYPE_REGULAR_BIT;
    }

    alignas(4) struct CmnAttrBuf attrBuf;
    if (getattrlist(disk->mountpoint.chars, &(struct attrlist) {
                                                .bitmapcount = ATTR_BIT_MAP_COUNT,
                                                .commonattr = ATTR_CMN_NAME,
                                            },
            &attrBuf,
            sizeof(attrBuf),
            0) == 0) {
        ffStrbufInitNS(&disk->name, attrBuf.nameRef.attr_length - 1 /* excluding '\0' */, attrBuf.nameSpace);
    }
}
#else
static void detectFsInfo(struct statfs* fs, FFDisk* disk) {
    #ifdef MNT_IGNORE
    if (fs->f_flags & MNT_IGNORE) {
        disk->type = FF_DISK_VOLUME_TYPE_HIDDEN_BIT;
    } else
    #endif
        if (!(fs->f_flags & MNT_LOCAL)) {
        disk->type = FF_DISK_VOLUME_TYPE_EXTERNAL_BIT;
    } else {
        disk->type = FF_DISK_VOLUME_TYPE_REGULAR_BIT;
    }
}
#endif

const char* ffDetectDisksImpl(FFDiskOptions* options, FFlist* disks) {
#ifndef __NetBSD__
    int size = getfsstat(NULL, 0, MNT_WAIT);
    if (size <= 0) {
        return "getfsstat(NULL, 0, MNT_WAIT) failed";
    }
#else
    int size = getvfsstat(NULL, 0, ST_WAIT);
    if (size <= 0) {
        return "getvfsstat(NULL, 0, ST_WAIT) failed";
    }
#endif

    FF_AUTO_FREE struct statfs* buf = malloc(sizeof(*buf) * (unsigned) size);
#ifndef __NetBSD__
    if (getfsstat(buf, (int) (sizeof(*buf) * (unsigned) size), MNT_NOWAIT) <= 0) {
        return "getfsstat(buf, size, MNT_NOWAIT) failed";
    }
#else
    if (getvfsstat(buf, sizeof(*buf) * (unsigned) size, ST_NOWAIT) <= 0) {
        return "getvfsstat(buf, size, ST_NOWAIT) failed";
    }
#endif

    for (struct statfs* fs = buf; fs < buf + size; ++fs) {
        if (__builtin_expect(options->folders.length > 0, 0)) {
            if (!ffStrbufSeparatedContainS(&options->folders, fs->f_mntonname, FF_DISK_FOLDER_SEPARATOR)) {
                continue;
            }
        } else if (!ffStrEquals(fs->f_mntonname, "/") && !ffStrStartsWith(fs->f_mntfromname, "/dev/") && !ffStrEquals(fs->f_fstypename, "zfs") && !ffStrEquals(fs->f_fstypename, "fusefs.sshfs")) {
            continue;
        }

        if (options->hideFolders.length && ffDiskMatchesFolderPatterns(&options->hideFolders, fs->f_mntonname, FF_DISK_FOLDER_SEPARATOR)) {
            continue;
        }

        if (options->hideFS.length && ffStrbufSeparatedContainS(&options->hideFS, fs->f_fstypename, ':')) {
            continue;
        }

#ifdef __FreeBSD__
        // f_bavail and f_ffree are signed on FreeBSD...
        if (fs->f_bavail < 0) {
            fs->f_bavail = 0;
        }
        if (fs->f_ffree < 0) {
            fs->f_ffree = 0;
        }
#endif

        FFDisk* disk = FF_LIST_ADD(FFDisk, *disks);

        disk->bytesTotal = (uint64_t) fs->f_blocks * (uint64_t) fs->f_bsize;
        disk->bytesFree = (uint64_t) fs->f_bfree * (uint64_t) fs->f_bsize;
        disk->bytesAvailable = (uint64_t) fs->f_bavail * (uint64_t) fs->f_bsize;
        disk->bytesUsed = 0; // To be filled in ./disk.c

        disk->filesTotal = (uint32_t) fs->f_files;
        disk->filesUsed = (uint32_t) fs->f_files - (uint32_t) fs->f_ffree;

        ffStrbufInitS(&disk->mountFrom, fs->f_mntfromname);
        ffStrbufInitS(&disk->mountpoint, fs->f_mntonname);
        ffStrbufInitS(&disk->filesystem, fs->f_fstypename);
        ffStrbufInit(&disk->name);
        disk->type = 0;
        disk->createTime = 0;

        detectFsInfo(fs, disk);

        if (fs->f_flags & MNT_RDONLY) {
            disk->type |= FF_DISK_VOLUME_TYPE_READONLY_BIT;
        }

#ifdef __OpenBSD__
    #define st_birthtimespec __st_birthtim
#endif
#ifndef __DragonFly__
        struct stat st;
        if (stat(fs->f_mntonname, &st) == 0 && st.st_birthtimespec.tv_sec > 0) {
            disk->createTime = (uint64_t) (((uint64_t) st.st_birthtimespec.tv_sec * 1000) + ((uint64_t) st.st_birthtimespec.tv_nsec / 1000000));
        }
#endif
    }

    return NULL;
}
