from pathlib import Path

import pytest
from pydantic import ValidationError

from app import config as config_module
from app.config import Settings, get_settings

PROJECT_ROOT = Path(__file__).resolve().parents[2]
TEST_CONFIG_FILE = PROJECT_ROOT / "config.test.yaml"
MISSING_REQUIRED_SECTION_CONFIG_FILE = (
    PROJECT_ROOT / "tests" / "config" / "fixtures" / "config.missing_adapter.yaml"
)
DEFAULT_CONFIG_FILE_FIXTURE = (
    PROJECT_ROOT / "tests" / "config" / "fixtures" / "config.default.yaml"
)
TEST_OVERRIDE_CONFIG_FILE_FIXTURE = (
    PROJECT_ROOT / "tests" / "config" / "fixtures" / "config.test.override.yaml"
)


def _use_runtime_config_files(
    monkeypatch: pytest.MonkeyPatch,
    *,
    test_config_file: Path,
    default_config_file: Path | None = None,
) -> None:
    monkeypatch.setattr(config_module, "TEST_CONFIG_FILE", str(test_config_file))
    if default_config_file is not None:
        monkeypatch.setattr(
            config_module,
            "DEFAULT_CONFIG_FILE",
            str(default_config_file),
        )
    get_settings.cache_clear()


def test_configuration_sections_are_loaded_from_yaml_file(
    monkeypatch: pytest.MonkeyPatch,
) -> None:
    _use_runtime_config_files(monkeypatch, test_config_file=TEST_CONFIG_FILE)

    settings = Settings()

    assert settings.controller.api_prefix == "/api/v1"
    assert settings.controller.request_id_header == "X-Request-ID"
    assert settings.service.provider_timeout_seconds == 10.0
    assert settings.service.max_parallel_providers == 8
    assert settings.business_logic.weight_round_scale == 2
    assert settings.repository.redis_dsn == "redis://localhost:6379/0"
    assert settings.repository.price_cache_ttl_seconds == 900
    assert settings.adapter.cdek_base_url == "https://api.cdek.ru/v2"
    assert settings.adapter.cdek_client_id == "test-client-id"
    assert settings.adapter.cdek_client_secret == "test-client-secret"
    assert settings.adapter.cdek_retry_attempts == 2
    assert settings.adapter.cdek_retry_backoff_seconds == 0.2
    assert settings.adapter.cdek_timeout_seconds == 10.0
    assert settings.adapter.cdek_cache_ttl_seconds == 900


def test_get_settings_fails_when_required_yaml_section_is_missing(
    monkeypatch: pytest.MonkeyPatch,
) -> None:
    _use_runtime_config_files(
        monkeypatch,
        test_config_file=MISSING_REQUIRED_SECTION_CONFIG_FILE,
    )

    with pytest.raises(ValidationError) as error:
        get_settings()

    locations = {tuple(item["loc"]) for item in error.value.errors()}
    assert ("adapter",) in locations
    get_settings.cache_clear()


def test_get_settings_returns_cached_instance(monkeypatch: pytest.MonkeyPatch) -> None:
    _use_runtime_config_files(monkeypatch, test_config_file=TEST_CONFIG_FILE)

    first = get_settings()
    second = get_settings()

    assert first is second
    assert first.service.provider_timeout_seconds == 10.0
    get_settings.cache_clear()


def test_get_settings_uses_config_test_yaml_in_pytest_environment(
    monkeypatch: pytest.MonkeyPatch,
) -> None:
    _use_runtime_config_files(
        monkeypatch,
        test_config_file=TEST_OVERRIDE_CONFIG_FILE_FIXTURE,
        default_config_file=DEFAULT_CONFIG_FILE_FIXTURE,
    )

    settings = get_settings()

    assert settings.service.provider_timeout_seconds == 17.0
    assert settings.controller.api_prefix == "/from-config-test-yaml"
    assert settings.adapter.cdek_client_id == "test-id"
    get_settings.cache_clear()