"""Config loading and validation — the instrument's shape can't drift."""

import shutil

import pytest

from diaglib import list_industries, load_config
from tests.conftest import CONFIGS


def test_contact_center_loads(config):
    assert config.industry == "contact_center"
    assert config.version == "1.0"
    assert len(config.competencies) == 12
    assert [d.id for d in config.dimensions] == [
        "strategy_value", "foundations", "delivery", "sustain"]
    # 4 dimensions × 3 competencies — the heatmap contract
    for d in config.dimensions:
        assert sum(1 for c in config.competencies if c.dimension == d.id) == 3
    assert config.foundational_competencies == [
        "process_discovery", "data_readiness", "technical_architecture"]
    assert [d.id for d in config.value_drivers] == [
        "deflection_lift", "aht_reduction", "attrition_reduction"]


def test_capping_bands_pinned(config):
    bands = {k: (v.realized_low, v.realized_high)
             for k, v in config.capping_heuristic.items()}
    assert bands == {
        1: (0.00, 0.15), 2: (0.25, 0.40), 3: (0.50, 0.65),
        4: (0.65, 0.85), 5: (0.80, 1.00),
    }


def test_every_competency_has_five_levels_and_vignette(config):
    for c in config.competencies:
        assert set(c.level_descriptors) == {1, 2, 3, 4, 5}
        assert c.failure_vignette
        assert c.description


def test_unlock_costs_reachable(config):
    # Every foundational competency can be lifted 1→5 in the CC config.
    for cid in config.foundational_competencies:
        for level in (1, 2, 3, 4):
            lift = config.lift_cost(cid, level)
            assert lift is not None, f"{cid} lift {level}->{level + 1} missing"
            assert lift.cost_low <= lift.cost_high


def test_stub_config_loads(stub_config):
    assert stub_config.industry == "financial_services"
    assert stub_config.value_drivers == []
    assert len(stub_config.competencies) == 12   # model comes from base


def test_list_industries():
    assert list_industries(CONFIGS) == ["contact_center", "financial_services"]


def test_overlay_may_not_redefine_base_keys(tmp_path):
    shutil.copy(CONFIGS / "base.yaml", tmp_path / "base.yaml")
    (tmp_path / "rogue.yaml").write_text(
        "extends: base\nindustry: rogue\ncompetencies: []\n", encoding="utf-8")
    with pytest.raises(ValueError, match="base-only"):
        load_config("rogue", tmp_path)


def test_overlay_must_extend_base(tmp_path):
    shutil.copy(CONFIGS / "base.yaml", tmp_path / "base.yaml")
    (tmp_path / "loner.yaml").write_text("industry: loner\n", encoding="utf-8")
    with pytest.raises(ValueError, match="extends"):
        load_config("loner", tmp_path)