import logging
from pathlib import Path
from typing import Any

from pydantic.fields import FieldInfo
from pydantic_settings import BaseSettings, PydanticBaseSettingsSource, SettingsConfigDict, TomlConfigSettingsSource

from libs.file_utils import search_file_upwards

from .deploy import DeploymentConfig
from .enterprise import EnterpriseFeatureConfig
from .extend import ExtendConfig  # 二开部分 新增配置
from .extra import ExtraServiceConfig
from .feature import FeatureConfig
from .middleware import MiddlewareConfig
from .observability import ObservabilityConfig
from .packaging import PackagingInfo
from .remote_settings_sources import RemoteSettingsSource, RemoteSettingsSourceConfig, RemoteSettingsSourceName
from .remote_settings_sources.apollo import ApolloSettingsSource
from .remote_settings_sources.nacos import NacosSettingsSource

logger = logging.getLogger(__name__)


class RemoteSettingsSourceFactory(PydanticBaseSettingsSource):
    def __init__(self, settings_cls: type[BaseSettings]):
        super().__init__(settings_cls)

    def get_field_value(self, field: FieldInfo, field_name: str) -> tuple[Any, str, bool]:
        raise NotImplementedError

    def __call__(self) -> dict[str, Any]:
        current_state = self.current_state
        remote_source_name = current_state.get("REMOTE_SETTINGS_SOURCE_NAME")
        if not remote_source_name:
            return {}

        remote_source: RemoteSettingsSource | None = None
        match remote_source_name:
            case RemoteSettingsSourceName.APOLLO:
                remote_source = ApolloSettingsSource(current_state)
            case RemoteSettingsSourceName.NACOS:
                remote_source = NacosSettingsSource(current_state)
            case _:
                logger.warning("Unsupported remote source: %s", remote_source_name)
                return {}

        d: dict[str, Any] = {}

        for field_name, field in self.settings_cls.model_fields.items():
            field_value, field_key, value_is_complex = remote_source.get_field_value(field, field_name)
            field_value = remote_source.prepare_field_value(field_name, field, field_value, value_is_complex)
            if field_value is not None:
                d[field_key] = field_value

        return d


class DifyConfig(
    # Packaging info
    PackagingInfo,
    # Deployment configs
    DeploymentConfig,
    # Feature configs
    FeatureConfig,
    # Middleware configs
    MiddlewareConfig,
    # Extra service configs
    ExtraServiceConfig,
    # Observability configs
    ObservabilityConfig,
    # Remote source configs
    RemoteSettingsSourceConfig,
    # Enterprise feature configs
    # **Before using, please contact business@dify.ai by email to inquire about licensing matters.**
    EnterpriseFeatureConfig,
    # 二开部分 新增配置
    ExtendConfig,
):
    model_config = SettingsConfigDict(
        # read from dotenv format config file
        env_file=".env",
        env_file_encoding="utf-8",
        # ignore extra attributes
        extra="ignore",
    )

    # Before adding any config,
    # please consider to arrange it in the proper config group of existed or added
    # for better readability and maintainability.
    # Thanks for your concentration and consideration.

    @classmethod
    def settings_customise_sources(
        cls,
        settings_cls: type[BaseSettings],
        init_settings: PydanticBaseSettingsSource,
        env_settings: PydanticBaseSettingsSource,
        dotenv_settings: PydanticBaseSettingsSource,
        file_secret_settings: PydanticBaseSettingsSource,
    ) -> tuple[PydanticBaseSettingsSource, ...]:
        return (
            init_settings,
            env_settings,
            RemoteSettingsSourceFactory(settings_cls),
            dotenv_settings,
            file_secret_settings,
            TomlConfigSettingsSource(
                settings_cls=settings_cls,
                toml_file=search_file_upwards(
                    base_dir_path=Path(__file__).parent,
                    target_file_name="pyproject.toml",
                    max_search_parent_depth=2,
                ),
            ),
        )