"""Unit tests for ``_derive_dept_hierarchy``.

The Google ``Department_Information`` custom schema has 4 slots
(L1-L4 Dept). SuccessFactors ``cust_L0`` is the legal entity (e.g.
"PingCAP") and including it as L1 pushes the real top business unit
down into L2 — which Google admins read as "Engineering Group is a
sub-unit of PingCAP". The handler now strips configured root segments
before mapping into the L1-L4 slots.
"""
from __future__ import annotations

from app.scheduled_jobs.google_handlers import _derive_dept_hierarchy


def test_drops_company_root_when_configured() -> None:
    levels = _derive_dept_hierarchy(
        "PingCAP / Engineering Group / Global Cloud & Customer Support"
        " / Support Engineering",
        level_max=4,
        drop_root_segments=["PingCAP"],
    )
    assert levels == [
        "Engineering Group",
        "Global Cloud & Customer Support",
        "Support Engineering",
    ]


def test_drop_root_is_case_insensitive() -> None:
    levels = _derive_dept_hierarchy(
        "pingcap / Engineering Group / Team",
        drop_root_segments=["PingCAP"],
    )
    assert levels == ["Engineering Group", "Team"]


def test_no_drop_when_root_not_in_list() -> None:
    levels = _derive_dept_hierarchy(
        "Acme / Engineering / Team",
        drop_root_segments=["PingCAP"],
    )
    assert levels == ["Acme", "Engineering", "Team"]


def test_no_drop_when_list_empty() -> None:
    levels = _derive_dept_hierarchy(
        "PingCAP / Engineering / Team",
        drop_root_segments=[],
    )
    assert levels == ["PingCAP", "Engineering", "Team"]


def test_drop_then_truncate_when_over_max() -> None:
    """Drop root first, then take deepest level_max if still too long."""
    levels = _derive_dept_hierarchy(
        "PingCAP / A / B / C / D / E",
        level_max=4,
        drop_root_segments=["PingCAP"],
    )
    assert levels == ["B", "C", "D", "E"]


def test_empty_path_returns_empty() -> None:
    assert _derive_dept_hierarchy(None, drop_root_segments=["PingCAP"]) == []
    assert _derive_dept_hierarchy("", drop_root_segments=["PingCAP"]) == []
    assert _derive_dept_hierarchy(
        "PingCAP", drop_root_segments=["PingCAP"],
    ) == []