import os
from typing import List
from dotenv import load_dotenv

# Load environment variables from .env file
load_dotenv()

class Config:
    """Configuration settings loaded from environment variables."""
    
    # Google Cloud Configuration
    GOOGLE_APPLICATION_CREDENTIALS: str = os.getenv("GOOGLE_APPLICATION_CREDENTIALS", "")
    GOOGLE_CLOUD_PROJECT: str = os.getenv("GOOGLE_CLOUD_PROJECT", "")
    
    # OpenAI Configuration
    OPENAI_API_KEY: str = os.getenv("OPENAI_API_KEY", "")
    OPENAI_MODEL: str = os.getenv("OPENAI_MODEL", "gpt-4o-mini")
    
    # Speech-to-Text Configuration
    SPEECH_LANGUAGE_CODE: str = os.getenv("SPEECH_LANGUAGE_CODE", "id-ID")
    SPEECH_SAMPLE_RATE: int = int(os.getenv("SPEECH_SAMPLE_RATE", "48000"))
    SPEECH_ENCODING: str = os.getenv("SPEECH_ENCODING", "WEBM_OPUS")
    
    # Text-to-Speech Configuration
    TTS_LANGUAGE_CODE: str = os.getenv("TTS_LANGUAGE_CODE", "id-ID")
    TTS_VOICE_NAME: str = os.getenv("TTS_VOICE_NAME", "id-ID-Standard-A")
    TTS_VOICE_GENDER: str = os.getenv("TTS_VOICE_GENDER", "FEMALE")
    TTS_SPEAKING_RATE: float = float(os.getenv("TTS_SPEAKING_RATE", "1.0"))
    TTS_PITCH: float = float(os.getenv("TTS_PITCH", "0.0"))
    
    # Server Configuration
    HOST: str = os.getenv("HOST", "0.0.0.0")
    PORT: int = int(os.getenv("PORT", "8000"))
    DEBUG: bool = os.getenv("DEBUG", "false").lower() == "true"
    
    # CORS Configuration
    CORS_ORIGINS: List[str] = [
        origin.strip() 
        for origin in os.getenv("CORS_ORIGINS", "http://localhost:3000,http://localhost:5173").split(",")
    ]
    
    @classmethod
    def validate(cls) -> None:
        """Validate required environment variables are set."""
        required_vars = [
            ("OPENAI_API_KEY", cls.OPENAI_API_KEY),
        ]
        
        missing_vars = []
        for var_name, var_value in required_vars:
            if not var_value:
                missing_vars.append(var_name)
        
        if missing_vars:
            raise ValueError(f"Missing required environment variables: {', '.join(missing_vars)}")
        
        # Warn about optional but recommended variables
        if not cls.GOOGLE_APPLICATION_CREDENTIALS:
            print("Warning: GOOGLE_APPLICATION_CREDENTIALS not set. Speech features may not work.")
        
        if not cls.GOOGLE_CLOUD_PROJECT:
            print("Warning: GOOGLE_CLOUD_PROJECT not set. Some Google Cloud features may not work.")

# Global config instance
config = Config()