#!/usr/bin/env python3

import os
import stat
import sys
import tempfile

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 stat_cmp_basic
from posix_parity import touch


def st_cmp(lhs, rhs):
    return (
        stat_cmp_basic(lhs, rhs)
        and stat.S_IFMT(lhs.st_mode) == stat.S_IFMT(rhs.st_mode)
        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_file = join(mount, "posix-getattr/file")
        native_file = join(native, "posix-getattr/file")
        merge_dir = join(mount, "posix-getattr/dir")
        native_dir = join(native, "posix-getattr/dir")
        merge_missing = join(mount, "posix-getattr/missing")
        native_missing = join(native, "posix-getattr/missing")
        merge_notdir = join(mount, "posix-getattr/notdir")
        native_notdir = join(native, "posix-getattr/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


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