import os
from typing import List, Optional
from pydantic_settings import BaseSettings
from pydantic import Field


class Config(BaseSettings):
    """Configuration for ChatCal Voice-Enabled Hugging Face deployment."""
    
    # Application
    app_name: str = Field(default="ChatCal Voice Assistant", env="APP_NAME")
    app_env: str = Field(default="production", env="APP_ENV")
    
    # Groq API (primary LLM)
    groq_api_key: str = Field(..., env="GROQ_API_KEY")
    
    # Anthropic (fallback LLM)
    anthropic_api_key: Optional[str] = Field(None, env="ANTHROPIC_API_KEY")
    
    # Gemini API (fallback LLM)
    gemini_api_key: Optional[str] = Field(None, env="GEMINI_API_KEY")
    
    # Google Calendar
    google_calendar_id: str = Field(default="pgits.job@gmail.com", env="GOOGLE_CALENDAR_ID")
    google_client_id: Optional[str] = Field(None, env="GOOGLE_CLIENT_ID")
    google_client_secret: Optional[str] = Field(None, env="GOOGLE_CLIENT_SECRET")
    
    # Security
    secret_key: str = Field(..., env="SECRET_KEY")
    
    # Timezone
    default_timezone: str = Field(default="America/New_York", env="DEFAULT_TIMEZONE")
    
    # Working Hours Configuration
    weekday_start_time: str = Field(default="07:30", env="WEEKDAY_START_TIME")
    weekday_end_time: str = Field(default="18:30", env="WEEKDAY_END_TIME")
    weekend_start_time: str = Field(default="10:30", env="WEEKEND_START_TIME")
    weekend_end_time: str = Field(default="16:30", env="WEEKEND_END_TIME")
    working_hours_timezone: str = Field(default="America/New_York", env="WORKING_HOURS_TIMEZONE")
    
    # Chat Settings
    max_conversation_history: int = Field(default=20, env="MAX_CONVERSATION_HISTORY")
    session_timeout_minutes: int = Field(default=30, env="SESSION_TIMEOUT_MINUTES")
    
    # Contact Information
    my_phone_number: str = Field(..., env="MY_PHONE_NUMBER")
    my_email_address: str = Field(..., env="MY_EMAIL_ADDRESS")
    
    # Email Service Configuration
    smtp_server: str = Field(default="smtp.gmail.com", env="SMTP_SERVER")
    smtp_port: int = Field(default=587, env="SMTP_PORT")
    smtp_username: Optional[str] = Field(None, env="SMTP_USERNAME")
    smtp_password: Optional[str] = Field(None, env="SMTP_PASSWORD")
    email_from_name: str = Field(default="ChatCal Voice Assistant", env="EMAIL_FROM_NAME")
    
    # Testing Configuration
    testing_mode: bool = Field(default=True, env="TESTING_MODE")
    
    # Audio Services Configuration (Hugging Face spaces)
    stt_service_url: str = Field(
        default="https://huggingface.co/spaces/pgits/stt-gpu-service", 
        env="STT_SERVICE_URL"
    )
    tts_service_url: str = Field(
        default="https://huggingface.co/spaces/pgits/tts-gpu-service",
        env="TTS_SERVICE_URL"
    )
    
    # Voice Settings
    default_voice: str = Field(default="v2/en_speaker_6", env="DEFAULT_VOICE")
    enable_voice_responses: bool = Field(default=True, env="ENABLE_VOICE_RESPONSES")
    
    class Config:
        env_file = ".env"
        env_file_encoding = "utf-8"
        case_sensitive = False


# Global config instance
config = Config()