"""SP9 — payer config YAML loader tests."""

from __future__ import annotations

from pathlib import Path

import pytest
import yaml

from cyclone import payers


@pytest.fixture(autouse=True)
def _reset_registry():
    payers.reset()
    yield
    payers.reset()


def test_load_default_config_has_co_txix_837p():
    configs = payers.load_payer_configs()
    assert ("CO_TXIX", "837P") in configs
    block = configs[("CO_TXIX", "837P")]
    assert block["payer_id"] == "CO_TXIX"
    assert "CH" in block["bht06_allowed"]
    assert "RP" in block["bht06_allowed"]
    assert block["bht06_default"] == "CH"
    assert block["sbr09_default"] == "MC"


def test_load_default_config_has_co_txix_835():
    configs = payers.load_payer_configs()
    assert ("CO_TXIX", "835") in configs
    block = configs[("CO_TXIX", "835")]
    assert "1811725341" in block["expected_payer_tax_ids"]
    assert block["expected_payer_health_plan_id"] == "7912900843"


def test_get_config_returns_block():
    payers.load_payer_configs()
    block = payers.get_config("CO_TXIX", "837P")
    assert block is not None
    assert block["submitter_name"] == "Dzinesco"


def test_get_config_returns_none_for_missing():
    payers.load_payer_configs()
    assert payers.get_config("UNKNOWN_PAYER", "837P") is None


def test_load_invalid_yaml_raises(tmp_path):
    bad = tmp_path / "bad.yaml"
    bad.write_text(yaml.safe_dump({"payers": [
        {"payer_id": "X", "configs": {"837P": {"submitter_name": "ok"}}}  # missing required keys
    ]}))
    with pytest.raises(ValueError, match="invalid config"):
        payers.load_payer_configs(bad)


def test_load_missing_payers_key_raises(tmp_path):
    bad = tmp_path / "bad.yaml"
    bad.write_text("not_a_payers_key: 1")
    with pytest.raises(ValueError, match="missing top-level 'payers:'"):
        payers.load_payer_configs(bad)


def test_load_missing_file_warns_and_clears(tmp_path, caplog):
    fake = tmp_path / "does-not-exist.yaml"
    with caplog.at_level("WARNING"):
        result = payers.load_payer_configs(fake)
    assert result == {}


def test_all_configs_returns_snapshot():
    payers.load_payer_configs()
    snap = payers.all_configs()
    assert isinstance(snap, dict)
    assert len(snap) >= 2
    # Mutating snapshot must not affect registry
    snap.clear()
    assert len(payers.all_configs()) >= 2


def test_reload_picks_up_changes(tmp_path):
    a = tmp_path / "a.yaml"
    a.write_text(yaml.safe_dump({"payers": [
        {"payer_id": "AAA", "configs": {"837P": {
            "submitter_name": "A", "submitter_contact_name": "A",
            "submitter_contact_email": "a@a",
            "receiver_name": "R", "receiver_id": "R",
            "bht06_allowed": ["CH"], "bht06_default": "CH",
            "sbr09_default": "MC", "sbr09_allowed": ["MC"],
            "payer_id_qualifier": "PI", "payer_id": "AAA",
            "pwk_supported": False, "cas_2320_group_allowed": False,
        }}}
    ]}))
    b = tmp_path / "b.yaml"
    b.write_text(yaml.safe_dump({"payers": [
        {"payer_id": "BBB", "configs": {"837P": {
            "submitter_name": "B", "submitter_contact_name": "B",
            "submitter_contact_email": "b@b",
            "receiver_name": "R", "receiver_id": "R",
            "bht06_allowed": ["CH"], "bht06_default": "CH",
            "sbr09_default": "MC", "sbr09_allowed": ["MC"],
            "payer_id_qualifier": "PI", "payer_id": "BBB",
            "pwk_supported": False, "cas_2320_group_allowed": False,
        }}}
    ]}))
    payers.load_payer_configs(a)
    assert payers.get_config("AAA", "837P") is not None
    payers.load_payer_configs(b)
    assert payers.get_config("BBB", "837P") is not None
    assert payers.get_config("AAA", "837P") is None