import json
import os
from pydantic_settings import BaseSettings

class Settings(BaseSettings):
    hl7_host: str = "0.0.0.0"
    hl7_port: int = 6060
    contec_ports: list = [511, 515, 516, 517, 518, 519, 520]
    monitor_ip: str = ""
    monitor_model: str = "CMS7000PLUS"
    device_models: dict = {}
    target_api_url: str = "https://api.example.com/vitals"
    api_token: str = ""
    retry_interval_seconds: int = 60
    log_file: str = "hl7_forwarder.log"
    database_url: str = "sqlite:///./hl7_forwarder.db"

    class Config:
        env_file = ".env"

def get_settings() -> Settings:
    base_dir = os.path.dirname(os.path.abspath(__file__))
    config_file = os.path.join(base_dir, "config.json")
    
    settings_obj = Settings()
    
    if os.path.exists(config_file):
        with open(config_file, "r") as f:
            try:
                data = json.load(f)
                for k, v in data.items():
                    setattr(settings_obj, k, v)
            except json.JSONDecodeError:
                pass

    if settings_obj.database_url.startswith("sqlite:///./"):
        db_name = settings_obj.database_url.split("sqlite:///./")[1]
        settings_obj.database_url = f"sqlite:///{os.path.join(base_dir, db_name)}"
        
    if not os.path.isabs(settings_obj.log_file):
        settings_obj.log_file = os.path.join(base_dir, settings_obj.log_file)
        
    return settings_obj

settings = get_settings()