"""Unit tests for the dimension IR + ``admits`` scoping gate (Fase 1, Step 1, SC1).

``admits`` must accept an in-dimension candidate (``measure_type`` in the allowed
set) and reject an out-of-dimension one, exercising BOTH branches of the
code-prefix logic — empty prefixes (measure_type-only) and non-empty prefixes
where a matching vs non-matching code decides the outcome. A ``Dimension`` with an
empty ``label`` must fail construction (Pydantic ``ValidationError``).

Model test: ``tests/test_validator.py`` (rejection assertions).
"""

from __future__ import annotations

import pytest
from pydantic import ValidationError

from portfolio_optimiser.dimension import Dimension, admits


def _energy_dim(*, prefixes: frozenset[str] = frozenset()) -> Dimension:
    return Dimension(
        id="energi",
        label="Energi",
        allowed_measure_types=frozenset({"energy_efficiency"}),
        allowed_code_prefixes=prefixes,
    )


def test_admits_in_dimension_measure_type_only() -> None:
    """Empty ``allowed_code_prefixes``: only the measure_type gate applies."""
    dim = _energy_dim()
    assert (
        admits(measure_type="energy_efficiency", codes=frozenset({"07.1"}), dimension=dim) is True
    )


def test_admits_rejects_out_of_dimension_measure_type() -> None:
    """Out-of-dimension measure_type is rejected regardless of codes."""
    dim = _energy_dim()
    assert admits(measure_type="paving", codes=frozenset({"07.1"}), dimension=dim) is False


def test_admits_prefix_branch_matching_code() -> None:
    """Non-empty prefixes: a code matching a prefix is admitted."""
    dim = _energy_dim(prefixes=frozenset({"07"}))
    assert (
        admits(
            measure_type="energy_efficiency",
            codes=frozenset({"07.1", "99.9"}),
            dimension=dim,
        )
        is True
    )


def test_admits_prefix_branch_no_matching_code() -> None:
    """Non-empty prefixes: no code matches any prefix -> rejected even when measure_type is allowed."""
    dim = _energy_dim(prefixes=frozenset({"07"}))
    assert (
        admits(
            measure_type="energy_efficiency",
            codes=frozenset({"99.9"}),
            dimension=dim,
        )
        is False
    )


def test_dimension_empty_label_raises() -> None:
    """An empty ``label`` violates ``Field(min_length=1)`` -> ValidationError at construction."""
    with pytest.raises(ValidationError):
        Dimension(
            id="energi",
            label="",
            allowed_measure_types=frozenset({"energy_efficiency"}),
        )