#!/usr/bin/env python3

import errno
import os
import sys
import tempfile

from posix_parity import cleanup_dir
from posix_parity import cleanup_paths
from posix_parity import compare_access
from posix_parity import fail
from posix_parity import join
from posix_parity import mergerfs_mount
from posix_parity import temp_dir
from posix_parity import touch


def main():
    try:
        with mergerfs_mount() as (mount, _):
            with tempfile.TemporaryDirectory() as native:
                merge_base = temp_dir(mount)
                try:
                    native_base = join(native, os.path.basename(merge_base))
                    os.makedirs(native_base, exist_ok=True)

                    merge_file = join(merge_base, "file")
                    native_file = join(native_base, "file")
                    merge_notdir = join(merge_base, "notdir")
                    native_notdir = join(native_base, "notdir")
                    merge_missing = join(merge_base, "missing")
                    native_missing = join(native_base, "missing")

                    cleanup_paths([merge_file, merge_notdir])

                    touch(merge_file, b"ok", 0o644)
                    touch(native_file, b"ok", 0o644)
                    touch(merge_notdir, b"x", 0o644)
                    touch(native_notdir, b"x", 0o644)

                    err = compare_access("F_OK existing", merge_file, native_file, os.F_OK)
                    if err:
                        return fail(err)

                    err = compare_access(
                        "F_OK missing", merge_missing, native_missing, os.F_OK, errno.ENOENT
                    )
                    if err:
                        return fail(err)

                    err = compare_access(
                        "X_OK non-directory prefix",
                        join(merge_notdir, "child"),
                        join(native_notdir, "child"),
                        os.X_OK,
                        errno.ENOTDIR,
                    )
                    if err:
                        return fail(err)

                    os.chmod(merge_file, 0)
                    os.chmod(native_file, 0)

                    err = compare_access("R_OK unreadable", merge_file, native_file, os.R_OK)
                    if err:
                        return fail(err)

                    os.chmod(merge_file, 0o644)
                    os.chmod(native_file, 0o644)

                    return 0
                finally:
                    cleanup_dir(merge_base)
    except RuntimeError as exc:
        print(str(exc), end="")
        return 77


if __name__ == "__main__":
    raise SystemExit(main())