"""

  Configuration management for ShopAgent

  Loads environment variables and provides configuration objects
  """
  

  from pathlib import Path

  from typing import Optional

  from pydantic_settings import BaseSettings, PydanticBaseSettingsSource, SettingsConfigDict
  
  # config.py sits at app/config.py → parent.parent = project root
  PROJECT_ROOT = Path(__file__).resolve().parent.parent

  
  
  class Settings(BaseSettings):
      """Application settings loaded from environment variables
  
      All settings can be configured via .env file or environment variables.

      Priority (high → low): init kwargs > .env file > env vars > defaults

      """
  

      model_config = SettingsConfigDict(
          env_file=str(PROJECT_ROOT / ".env"),
          env_file_encoding="utf-8",
          case_sensitive=False,
          extra="ignore",
      )
  

      # OpenAI Configuration
      openai_api_key: str
      openai_model: str = "gpt-4o-mini"

      openai_temperature: float = 0.7
      openai_max_tokens: int = 1000

      # Base URL for OpenAI-compatible APIs (e.g. Qwen/DashScope)
      # Qwen 北京: https://dashscope.aliyuncs.com/compatible-mode/v1
      openai_api_base_url: Optional[str] = None

  
      # Search Configuration
      top_k_results: int = 10
      similarity_threshold: float = 0.6
  

      # Search API (see docs/搜索API对接指南.md)
      search_api_base_url: str = "http://120.76.41.98:6002"

      search_api_tenant_id: str = "170"

      # Application Configuration
      app_host: str = "0.0.0.0"
      app_port: int = 8000
      debug: bool = True
      log_level: str = "INFO"
  
      # Data Paths
      raw_data_path: str = "./data/raw"
      processed_data_path: str = "./data/processed"
      image_data_path: str = "./data/images"
  

      @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, ...]:
          """Make .env file take priority over system environment variables.
  
          Default order:  init > env > dotenv > secrets
          Our order:      init > dotenv > env > secrets
          """
          return init_settings, dotenv_settings, env_settings, file_secret_settings

  
  
  # Global settings instance
  settings = Settings()
  
  

  def get_absolute_path(relative_path: str) -> str:

      """Convert relative path to absolute path based on project root"""
      return str(PROJECT_ROOT / relative_path)