import os
from pathlib import Path
from pydantic_settings import BaseSettings
from typing import Optional


class Config(BaseSettings):
    """Application configuration from environment variables"""
    
    # API Keys
    pexels_api_key: Optional[str] = None
    hf_tts: Optional[str] = None
    
    # Server Configuration
    port: int = 8880
    log_level: str = "info"
    
    # System Configuration
    whisper_model: str = "tiny.en"
    whisper_verbose: bool = False
    concurrency: int = 1
    video_cache_size_in_bytes: int = 2684354560  # 2.5GB
    
    # Docker/Environment
    docker: bool = False
    dev: bool = False
    data_dir_path: Optional[str] = None
    
    class Config:
        env_file = ".env"
        case_sensitive = False
        extra = "ignore"
    
    @property
    def base_data_dir(self) -> Path:
        """Get the base data directory path"""
        if self.data_dir_path:
            return Path(self.data_dir_path)
        
        if self.docker:
            return Path("/data")
        
        # For local development
        home = Path.home()
        return home / ".short-video-maker"
    
    @property
    def videos_dir_path(self) -> Path:
        """Directory for storing generated videos"""
        path = self.base_data_dir / "videos"
        path.mkdir(parents=True, exist_ok=True)
        return path
    
    @property
    def temp_dir_path(self) -> Path:
        """Directory for temporary files"""
        path = self.base_data_dir / "temp"
        path.mkdir(parents=True, exist_ok=True)
        return path
    
    @property
    def music_dir_path(self) -> Path:
        """Directory for music files"""
        # Music files are bundled with the application
        return Path(__file__).parent / "static" / "music"
    
    @property
    def whisper_model_dir(self) -> Path:
        """Directory for Whisper models"""
        path = self.base_data_dir / "whisper_models"
        path.mkdir(parents=True, exist_ok=True)
        return path
    
    def ensure_directories(self):
        """Ensure all required directories exist"""
        self.videos_dir_path.mkdir(parents=True, exist_ok=True)
        self.temp_dir_path.mkdir(parents=True, exist_ok=True)
        self.whisper_model_dir.mkdir(parents=True, exist_ok=True)


# Global config instance
config = Config()