from __future__ import annotations

import os
import pytest

from core.config.settings import Settings, get_settings


class TestGetSettings:
    def test_returns_settings_instance(self, env_full) -> None:
        result = get_settings()
        assert isinstance(result, Settings)

    def test_caches_result(self, env_full) -> None:
        a = get_settings()
        b = get_settings()
        assert a is b

    def test_cache_clear_allows_new_instance(self, env_full) -> None:
        a = get_settings()
        get_settings.cache_clear()
        b = get_settings()
        assert a is not b


class TestSettings:
    def test_defaults(self) -> None:
        s = Settings(
            BOT_TOKEN="123456789:AAHdqTcvCH1vGWJxfSeofSAsQK6PALsAWo",
            OPENAI_API_KEY="sk-test",
            ADMIN_ID="1",
        )
        assert s.PORT == 7860
        assert s.LOG_LEVEL == "INFO"
        assert s.LOG_FORMAT == "json"
        assert s.DEFAULT_PROVIDER == "openai"

    def test_required_fields(self) -> None:
        s = Settings(
            BOT_TOKEN="123456789:AAHdqTcvCH1vGWJxfSeofSAsQK6PALsAWo",
            OPENAI_API_KEY="sk-test",
            ADMIN_ID="1",
        )
        rf = s.required_fields
        assert "BOT_TOKEN" in rf
        assert "OPENAI_API_KEY" in rf
        assert "ADMIN_ID" in rf

    def test_port_validation_low(self) -> None:
        with pytest.raises(Exception):
            Settings(
                BOT_TOKEN="t",
                OPENAI_API_KEY="k",
                ADMIN_ID="1",
                PORT=0,
            )

    def test_port_validation_high(self) -> None:
        with pytest.raises(Exception):
            Settings(
                BOT_TOKEN="t",
                OPENAI_API_KEY="k",
                ADMIN_ID="1",
                PORT=70000,
            )

    def test_reads_from_env(self, env_full) -> None:
        s = get_settings()
        assert s.BOT_TOKEN == "123456789:AAHdqTcvCH1vGWJxfSeofSAsQK6PALsAWo"
        assert s.ADMIN_ID == "123456789"

    def test_default_provider_literal(self) -> None:
        s = Settings(
            BOT_TOKEN="t",
            OPENAI_API_KEY="k",
            ADMIN_ID="1",
            DEFAULT_PROVIDER="claude",
        )
        assert s.DEFAULT_PROVIDER == "claude"

    def test_invalid_default_provider(self) -> None:
        with pytest.raises(Exception):
            Settings(
                BOT_TOKEN="t",
                OPENAI_API_KEY="k",
                ADMIN_ID="1",
                DEFAULT_PROVIDER="invalid_provider",
            )