import pytest
from pydantic import ValidationError

from src.core.config import Settings, get_settings

SMB_ENV = {
    "OPENBAO__SMB__SMB_HOST": "smb.example",
    "OPENBAO__SMB__SMB_PATH": "share",
    "OPENBAO__SMB__SMB_LOGIN": "user",
    "OPENBAO__SMB__SMB_PASSWORD": "secret",
}


def _clean_env(monkeypatch):
    """Убрать из окружения всё, что относится к SMB/NATS-учётным данным и режиму горячей папки."""
    for key in list(SMB_ENV) + ["OPENBAO__NATS__NATS_SEED", "OPENBAO__NATS__NATS_JWT", "SCAN_HOTFOLDER_MODE"]:
        monkeypatch.delenv(key, raising=False)


def test_defaults_local_mode_without_smb_and_nats_credentials(monkeypatch, minimal_env_file):
    _clean_env(monkeypatch)

    s = get_settings()

    assert s.SERVICE_NAME == "scan-gateway"
    assert s.NATS_ENABLED is True
    assert s.PUBLISH_RETRIES == 3
    assert s.DONE_CACHE_SIZE == 1000
    assert s.SCAN_HOTFOLDER_MODE == "local"
    assert s.SCAN_INPUT_DIR == "Input"
    assert s.SCAN_OUTPUT_DIR == "Output"
    assert s.SCAN_POLL_SECONDS == 5
    assert s.SCAN_TIMEOUT_SECONDS == 300
    assert s.SCAN_MAX_INFLIGHT == 4
    assert s.OPENBAO.SMB.SMB_HOST == ""
    assert s.OPENBAO.NATS.NATS_SEED == ""
    assert s.OPENBAO.NATS.NATS_JWT == ""
    assert not hasattr(s.OPENBAO, "DATABASE")


def test_local_mode_requires_hotfolder_path(monkeypatch):
    _clean_env(monkeypatch)
    monkeypatch.setenv("SCAN_HOTFOLDER_PATH", "")

    with pytest.raises(ValidationError, match="SCAN_HOTFOLDER_PATH"):
        get_settings()


def test_smb_mode_without_smb_block_fails_with_clear_error(monkeypatch):
    _clean_env(monkeypatch)
    monkeypatch.setenv("SCAN_HOTFOLDER_MODE", "smb")

    with pytest.raises(ValidationError, match="OPENBAO__SMB"):
        get_settings()


def test_smb_mode_with_smb_block_ok(monkeypatch):
    _clean_env(monkeypatch)
    monkeypatch.setenv("SCAN_HOTFOLDER_MODE", "smb")
    for key, value in SMB_ENV.items():
        monkeypatch.setenv(key, value)

    s = get_settings()

    assert s.OPENBAO.SMB.SMB_HOST == "smb.example"


def test_unknown_hotfolder_mode_rejected(monkeypatch):
    monkeypatch.setenv("SCAN_HOTFOLDER_MODE", "ftp")

    with pytest.raises(ValidationError):
        get_settings()


def test_env_file_selected_by_env_file_variable(monkeypatch, tmp_path):
    _clean_env(monkeypatch)
    for key in (
        "SCAN_HOTFOLDER_PATH",
        "SCAN_POLL_SECONDS",
        "SERVER__PORT",
        "OPENBAO__NATS__NATS_URL",
        "OPENBAO__MINIO__MINIO_URL",
        "OPENBAO__MINIO__MINIO_ADMIN_LOGIN",
        "OPENBAO__MINIO__MINIO_ADMIN_PASSWORD",
        "OPENBAO__MINIO__MINIO_BUCKET",
    ):
        monkeypatch.delenv(key, raising=False)
    env_file = tmp_path / "custom.env"
    env_file.write_text(
        "\n".join(
            [
                "OPENBAO__MINIO__MINIO_URL=minio.test:9000",
                "OPENBAO__MINIO__MINIO_ADMIN_LOGIN=a",
                "OPENBAO__MINIO__MINIO_ADMIN_PASSWORD=b",
                "OPENBAO__MINIO__MINIO_BUCKET=bucket",
                "OPENBAO__NATS__NATS_URL=nats://nats.test:4222",
                "SCAN_HOTFOLDER_PATH=/data/hot",
                "SCAN_POLL_SECONDS=1",
                "SERVER__PORT=8123",
            ]
        )
    )
    monkeypatch.setenv("ENV_FILE", str(env_file))

    s = get_settings()

    assert s.OPENBAO.MINIO.MINIO_URL == "minio.test:9000"
    assert s.OPENBAO.NATS.NATS_URL == "nats://nats.test:4222"
    assert s.SCAN_HOTFOLDER_PATH == "/data/hot"
    assert s.SCAN_POLL_SECONDS == 1
    assert s.server.PORT == 8123


def test_get_settings_is_cached(monkeypatch):
    assert get_settings() is get_settings()
    assert isinstance(get_settings(), Settings)


def test_env_test_file_loads_for_tests():
    """pytest.ini выбирает `.env.test`: он должен давать рабочие настройки local-режима с укороченными интервалами."""
    s = get_settings()

    assert s.SCAN_HOTFOLDER_MODE == "local"
    assert s.SCAN_HOTFOLDER_PATH == "./.hotfolder-test"
    assert s.SCAN_POLL_SECONDS == 0.1
    assert s.SCAN_TIMEOUT_SECONDS == 5
    assert s.OPENBAO.MINIO.MINIO_URL == "127.0.0.1:9000"
    assert s.OPENBAO.MINIO.MINIO_SECURE is False
    assert s.OPENBAO.NATS.NATS_URL == "nats://127.0.0.1:4222"
    assert s.OPENBAO.NATS.NATS_SEED == ""


def test_env_example_loads(monkeypatch):
    """`.env.example` — рабочий dev-набор: Settings читает его без ошибок."""
    monkeypatch.setenv("ENV_FILE", ".env.example")

    s = get_settings()

    assert s.SCAN_HOTFOLDER_MODE == "local"
    assert s.SCAN_INPUT_DIR == "Input"
    assert s.OPENBAO.MINIO.MINIO_BUCKET == "arm-ka"
    assert s.OPENBAO.NATS.NATS_JWT == ""