"""
Configuration module for FactsDB service
Loads configuration from environment variables
"""

import os
from dataclasses import dataclass
from typing import Optional

@dataclass
class DatabaseConfig:
    """Database configuration"""
    path: str = "./facts.db"

@dataclass
class AIEndpointConfig:
    """AI endpoint configuration"""
    url: str = ""
    auth_token: str = ""

@dataclass
class FTPServerConfig:
    """FTP server configuration"""
    host: str = "0.0.0.0"
    port: int = 2121
    username: str = ""
    password: str = ""

@dataclass
class SchedulerConfig:
    """Scheduler configuration"""
    interval_minutes: int = 10

class Config:
    """Main configuration class"""
    
    def __init__(self):
        self.database = DatabaseConfig(
            path=os.getenv('DATABASE_PATH', './facts.db')
        )
        
        self.ai_endpoint = AIEndpointConfig(
            url=os.getenv('AI_ENDPOINT_URL', ''),
            auth_token=os.getenv('AI_ENDPOINT_TOKEN', '')
        )
        if not self.ai_endpoint.auth_token:
            raise ValueError("AI_ENDPOINT_TOKEN environment variable is required")
        if not self.ai_endpoint.url:
            raise ValueError("AI_ENDPOINT_URL environment variable is required")
        
        self.ftp_server = FTPServerConfig(
            host=os.getenv('FTP_HOST', '0.0.0.0'),
            port=int(os.getenv('FTP_PORT', '2121')),
            username=os.getenv('FTP_USERNAME', ''),
            password=os.getenv('FTP_PASSWORD', '')
        )
        if not self.ftp_server.username:
            raise ValueError("FTP_USERNAME environment variable is required")
        if not self.ftp_server.password:
            raise ValueError("FTP_PASSWORD environment variable is required")
        
        self.scheduler = SchedulerConfig(
            interval_minutes=int(os.getenv('SCHEDULER_INTERVAL', '10'))
        )