#!/usr/bin/env python3

import os
import sys
import tempfile
import errno

from posix_parity import compare_calls
from posix_parity import fail
from posix_parity import join
from posix_parity import touch


def errno_name(err):
    if err is None:
        return "None"
    return errno.errorcode.get(err, str(err))


def format_oserror(prefix, exc):
    return f"{prefix}: errno={exc.errno}({errno_name(exc.errno)}) msg={exc.strerror}"


def has_attr(name):
    def _cmp(lhs, rhs):
        return (name in lhs) == (name in rhs)

    return _cmp


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

    mount = sys.argv[1]
    xname = "user.mergerfs.posix"
    xvalue = b"parity-check"

    with tempfile.TemporaryDirectory() as native:
        merge_file = join(mount, "posix-xattr/file")
        native_file = join(native, "posix-xattr/file")
        merge_missing = join(mount, "posix-xattr/missing")
        native_missing = join(native, "posix-xattr/missing")
        merge_notdir = join(mount, "posix-xattr/notdir")
        native_notdir = join(native, "posix-xattr/notdir")

        touch(merge_file, b"x")
        touch(native_file, b"x")
        touch(merge_notdir, b"x")
        touch(native_notdir, b"x")

        err = compare_calls(
            "setxattr success",
            lambda: os.setxattr(merge_file, xname, xvalue),
            lambda: os.setxattr(native_file, xname, xvalue),
        )
        if err:
            try:
                os.setxattr(merge_file, xname, xvalue)
            except OSError as exc:
                err += " | " + format_oserror("mergerfs setxattr", exc)
            try:
                os.setxattr(native_file, xname, xvalue)
            except OSError as exc:
                err += " | " + format_oserror("native setxattr", exc)
            return fail(err)

        err = compare_calls(
            "getxattr success",
            lambda: os.getxattr(merge_file, xname),
            lambda: os.getxattr(native_file, xname),
            lambda lhs, rhs: lhs == rhs,
        )
        if err:
            try:
                os.getxattr(merge_file, xname)
            except OSError as exc:
                err += " | " + format_oserror("mergerfs getxattr", exc)
            try:
                os.getxattr(native_file, xname)
            except OSError as exc:
                err += " | " + format_oserror("native getxattr", exc)
            return fail(err)

        err = compare_calls(
            "listxattr includes key",
            lambda: os.listxattr(merge_file),
            lambda: os.listxattr(native_file),
            has_attr(xname),
        )
        if err:
            try:
                m_list = os.listxattr(merge_file)
                err += f" | mergerfs list={m_list!r}"
            except OSError as exc:
                err += " | " + format_oserror("mergerfs listxattr", exc)
            try:
                n_list = os.listxattr(native_file)
                err += f" | native list={n_list!r}"
            except OSError as exc:
                err += " | " + format_oserror("native listxattr", exc)
            return fail(err)

        err = compare_calls(
            "removexattr success",
            lambda: os.removexattr(merge_file, xname),
            lambda: os.removexattr(native_file, xname),
        )
        if err:
            try:
                os.removexattr(merge_file, xname)
            except OSError as exc:
                err += " | " + format_oserror("mergerfs removexattr", exc)
            try:
                os.removexattr(native_file, xname)
            except OSError as exc:
                err += " | " + format_oserror("native removexattr", exc)
            return fail(err)

        err = compare_calls(
            "getxattr missing attr",
            lambda: os.getxattr(merge_file, xname),
            lambda: os.getxattr(native_file, xname),
        )
        if err:
            try:
                os.getxattr(merge_file, xname)
            except OSError as exc:
                err += " | " + format_oserror("mergerfs getxattr missing", exc)
            try:
                os.getxattr(native_file, xname)
            except OSError as exc:
                err += " | " + format_oserror("native getxattr missing", exc)
            return fail(err)

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

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

        return 0


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