#!/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 temp_dir
from posix_parity import touch


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

    mount = sys.argv[1]

    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)


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