from __future__ import annotations

from pathlib import Path


def test_session_has_state_snapshot_and_status_contract() -> None:
    model_path = (
        Path(__file__).resolve().parents[3] / "src" / "models" / "agent_chat_session.py"
    )
    content = model_path.read_text(encoding="utf-8")

    assert "state_snapshot" in content
    assert "AgentChatSessionStatus" in content


def test_message_has_token_cost_and_metadata_contract() -> None:
    model_path = (
        Path(__file__).resolve().parents[3] / "src" / "models" / "agent_chat_message.py"
    )
    content = model_path.read_text(encoding="utf-8")

    assert "input_tokens" in content
    assert "output_tokens" in content
    assert "cost" in content
    assert '"metadata"' in content

    versions_dir = Path(__file__).resolve().parents[3] / "alembic" / "versions"
    migration_file = versions_dir / "20260305_agent_runtime_closed_loop_contract.py"
    assert migration_file.exists()


def test_message_currency_removal_migration_contract() -> None:
    versions_dir = Path(__file__).resolve().parents[3] / "alembic" / "versions"
    migration_file = versions_dir / "20260306_0002_drop_message_currency.py"
    assert migration_file.exists()

    content = migration_file.read_text(encoding="utf-8")
    assert "drop_column(\"messages\", \"currency\")" in content
    assert "Irreversible migration" in content