#!/usr/bin/env python3

import os
import stat
import sys
import tempfile

from posix_parity import cleanup_dir
from posix_parity import cleanup_paths
from posix_parity import compare_calls
from posix_parity import fail
from posix_parity import join
from posix_parity import should_compare_inode
from posix_parity import temp_dir
from posix_parity import touch


def st_cmp(lhs, rhs):
    return (
        stat.S_IFMT(lhs.st_mode) == stat.S_IFMT(rhs.st_mode)
        and stat.S_IMODE(lhs.st_mode) == stat.S_IMODE(rhs.st_mode)
        and lhs.st_size == rhs.st_size
        and lhs.st_nlink == rhs.st_nlink
    )


def st_cmp_with_inode(lhs, rhs):
    return st_cmp(lhs, rhs) and lhs.st_ino == rhs.st_ino


def main():
    if len(sys.argv) != 2:
        print("usage: TEST_posix_getattr_fgetattr <mountpoint>", file=sys.stderr)
        return 1

    mount = sys.argv[1]
    stcmp = st_cmp_with_inode if should_compare_inode(mount) else st_cmp

    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_dir = join(merge_base, "dir")
            native_dir = join(native_base, "dir")
            merge_missing = join(merge_base, "missing")
            native_missing = join(native_base, "missing")
            merge_notdir = join(merge_base, "notdir")
            native_notdir = join(native_base, "notdir")

            cleanup_paths([merge_file, merge_dir, merge_notdir])

            touch(merge_file, b"abc", 0o640)
            touch(native_file, b"abc", 0o640)
            os.makedirs(merge_dir, exist_ok=True)
            os.makedirs(native_dir, exist_ok=True)
            touch(merge_notdir, b"x", 0o644)
            touch(native_notdir, b"x", 0o644)

            err = compare_calls(
                "lstat regular", lambda: os.lstat(merge_file), lambda: os.lstat(native_file), stcmp
            )
            if err:
                return fail(err)

            err = compare_calls(
                "lstat directory", lambda: os.lstat(merge_dir), lambda: os.lstat(native_dir), stcmp
            )
            if err:
                return fail(err)

            mfd = os.open(merge_file, os.O_RDONLY)
            nfd = os.open(native_file, os.O_RDONLY)
            try:
                err = compare_calls("fstat open fd", lambda: os.fstat(mfd), lambda: os.fstat(nfd), stcmp)
                if err:
                    return fail(err)
            finally:
                os.close(mfd)
                os.close(nfd)

            err = compare_calls("lstat ENOENT", lambda: os.lstat(merge_missing), lambda: os.lstat(native_missing))
            if err:
                return fail(err)

            err = compare_calls(
                "lstat ENOTDIR",
                lambda: os.lstat(join(merge_notdir, "child")),
                lambda: os.lstat(join(native_notdir, "child")),
            )
            if err:
                return fail(err)

            return 0
        finally:
            cleanup_dir(merge_base)


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