#!/usr/bin/env python3

import os
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 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_src = join(merge_base, "src")
                    native_src = join(native_base, "src")
                    merge_dst = join(merge_base, "dst")
                    native_dst = join(native_base, "dst")
                    merge_slnk = join(merge_base, "symlink")
                    native_slnk = join(native_base, "symlink")
                    merge_missing = join(merge_base, "missing")
                    native_missing = join(native_base, "missing")

                    cleanup_paths([merge_src, merge_dst, merge_slnk])
                    touch(merge_src, b"src", 0o644)
                    touch(native_src, b"src", 0o644)

                    err = compare_calls("link success", lambda: os.link(merge_src, merge_dst), lambda: os.link(native_src, native_dst))
                    if err:
                        return fail(err)

                    err = compare_calls(
                        "link ENOENT source",
                        lambda: os.link(merge_missing, join(merge_base, "dst2")),
                        lambda: os.link(native_missing, join(native_base, "dst2")),
                    )
                    if err:
                        return fail(err)

                    err = compare_calls(
                        "symlink success",
                        lambda: os.symlink("src", merge_slnk),
                        lambda: os.symlink("src", native_slnk),
                    )
                    if err:
                        return fail(err)

                    err = compare_calls(
                        "symlink EEXIST",
                        lambda: os.symlink("src", merge_slnk),
                        lambda: os.symlink("src", native_slnk),
                    )
                    if err:
                        return fail(err)

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


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