import pytest
from pydantic import ValidationError

from src.core.config import Settings


def test_fastgpt_backend_accepts_legacy_environment_names():
    settings = Settings(
        _env_file=None,
        ZNJJ_ENVIRONMENT="test",
        AGENT_BACKEND="fastgpt",
        ANALYSIS_AUTH_TOKEN="test-fastgpt-key",
        ANALYSIS_SERVICE_URL="http://fastgpt.test",
        APP_ID="test-app",
    )

    assert settings.environment == "test"
    assert settings.agent_backend == "fastgpt"
    assert settings.has_fastgpt_config
    assert settings.fastgpt_api_key.get_secret_value() == "test-fastgpt-key"


def test_fastgpt_backend_rejects_incomplete_configuration():
    with pytest.raises(ValidationError, match="FastGPT backend requires"):
        Settings(
            _env_file=None,
            environment="test",
            agent_backend="fastgpt",
            fastgpt_api_key="test-key",
        )


def test_langgraph_backend_requires_only_minimal_llm_configuration():
    settings = Settings(
        _env_file=None,
        environment="test",
        agent_backend="langgraph",
        langgraph_checkpointer="memory",
        llm_api_key="test-llm-key",
        llm_model="test-model",
    )

    assert settings.agent_backend == "langgraph"
    assert settings.langgraph_checkpointer == "memory"
    assert not settings.has_fastgpt_config


def test_langgraph_backend_rejects_missing_llm_configuration():
    with pytest.raises(ValidationError, match="LLM_API_KEY, LLM_MODEL"):
        Settings(
            _env_file=None,
            environment="test",
            agent_backend="langgraph",
        )


def test_production_cannot_use_memory_checkpointer():
    with pytest.raises(ValidationError, match="cannot use the memory checkpointer"):
        Settings(
            _env_file=None,
            environment="production",
            agent_backend="langgraph",
            langgraph_checkpointer="memory",
            llm_api_key="test-llm-key",
            llm_model="test-model",
        )


def test_secret_values_are_masked_in_settings_repr():
    settings = Settings(
        _env_file=None,
        environment="test",
        agent_backend="langgraph",
        llm_api_key="never-print-this-key",
        llm_model="test-model",
    )

    assert "never-print-this-key" not in repr(settings)