"""TDD — build_unpack_payload: client-side Step 3 payload construction.

UP-1  mpack_key is passed through unchanged.
UP-2  branch defaults to "main" when not supplied.
UP-3  head is passed through unchanged.
UP-4  commits_count and objects_count default to 0 when not supplied.
UP-5  All five keys are always present in the returned dict.
UP-6  Counts are integers, not strings.
"""
from __future__ import annotations

from muse.core.mpack import build_unpack_payload
from muse.core.types import blob_id

_KEY = blob_id(b"some mpack bytes")
_HEAD = blob_id(b"tip commit")


def test_up1_mpack_key_passed_through() -> None:
    payload = build_unpack_payload(_KEY, branch="main", head=_HEAD)
    assert payload["mpack_key"] == _KEY


def test_up2_branch_defaults_to_main() -> None:
    payload = build_unpack_payload(_KEY, head=_HEAD)
    assert payload["branch"] == "main"


def test_up3_head_passed_through() -> None:
    payload = build_unpack_payload(_KEY, branch="dev", head=_HEAD)
    assert payload["head"] == _HEAD


def test_up4_counts_default_to_zero() -> None:
    payload = build_unpack_payload(_KEY, head=_HEAD)
    assert payload["commits_count"] == 0
    assert payload["objects_count"] == 0


def test_up5_all_keys_always_present() -> None:
    payload = build_unpack_payload(_KEY, head=_HEAD)
    assert set(payload) == {"mpack_key", "branch", "head", "commits_count", "objects_count"}


def test_up6_counts_are_integers() -> None:
    payload = build_unpack_payload(_KEY, head=_HEAD, commits_count=3, objects_count=12)
    assert isinstance(payload["commits_count"], int)
    assert isinstance(payload["objects_count"], int)
    assert payload["commits_count"] == 3
    assert payload["objects_count"] == 12