import os
from pydantic_settings import BaseSettings
from typing import Optional

class Settings(BaseSettings):
    """應用程式設定"""
    
    # LINE Bot 設定
    LINE_CHANNEL_ACCESS_TOKEN: str = os.getenv("LINE_CHANNEL_ACCESS_TOKEN", "")
    LINE_CHANNEL_SECRET: str = os.getenv("LINE_CHANNEL_SECRET", "")
    
    # 資料庫設定 (PostgreSQL 直連)
    DB_HOST: str = os.getenv("DB_HOST", "")
    DB_PORT: str = os.getenv("DB_PORT", "6543")
    DB_NAME: str = os.getenv("DB_NAME", "")
    DB_USER: str = os.getenv("DB_USER", "")
    DB_PASSWORD: str = os.getenv("DB_PASSWORD", "")
    
    # SQLAlchemy 資料庫 URL
    @property
    def DATABASE_URL(self) -> str:
        return f"postgresql+psycopg://{self.DB_USER}:{self.DB_PASSWORD}@{self.DB_HOST}:{self.DB_PORT}/{self.DB_NAME}"
    
    # OpenRouter 設定 (用於自然語言處理)
    OPENROUTER_API_KEY: Optional[str] = os.getenv("OPENROUTER_API_KEY", "")
    OPENROUTER_MODEL: str = os.getenv("OPENROUTER_MODEL", "anthropic/claude-3-haiku")
    
    # Groq 設定 (主要 AI 服務)
    GROQ_API_KEY: Optional[str] = os.getenv("GROQ_API_KEY", "")
    GROQ_MODEL: str = os.getenv("GROQ_MODEL", "qwen/qwen3-32b")
    
    # 其他設定
    DEBUG: bool = os.getenv("DEBUG", "False").lower() == "true"
    LOG_LEVEL: str = os.getenv("LOG_LEVEL", "INFO")
    
    class Config:
        env_file = ".env"
        case_sensitive = True

settings = Settings()