from typing import List, Union
from pydantic_settings import BaseSettings
from pydantic import field_validator
import os

class Settings(BaseSettings):
    PROJECT_NAME: str = "OAuth Authentication System"
    VERSION: str = "1.0.0"
    API_V1_STR: str = "/api/v1"
    
    SECRET_KEY: str = os.getenv("SECRET_KEY", "0198fda4-294e-77b0-a95d-2b601d2c594d")
    ALGORITHM: str = "HS256"
    ACCESS_TOKEN_EXPIRE_MINUTES: int = 30
    REFRESH_TOKEN_EXPIRE_DAYS: int = 7
    
    MONGODB_URL: str = os.getenv("MONGODB_URL", "mongodb://localhost:27017")
    DATABASE_NAME: str = os.getenv("DATABASE_NAME", "oauth_db")
    
    REDIS_URL: str = os.getenv("REDIS_URL", "redis://localhost:6379")
    
    BACKEND_CORS_ORIGINS: List[str] = ["http://localhost:3000", "http://localhost:5173"]
    
    ENVIRONMENT: str = os.getenv("ENVIRONMENT", "dev")
    
    BACKUP_PATH: str = os.getenv("BACKUP_PATH", "/var/backups/oauth")
    ARCHIVE_PATH: str = os.getenv("ARCHIVE_PATH", "/var/archives/oauth")
    
    SMTP_HOST: str = os.getenv("SMTP_HOST", "")
    SMTP_PORT: int = int(os.getenv("SMTP_PORT", "587"))
    SMTP_USER: str = os.getenv("SMTP_USER", "")
    SMTP_PASSWORD: str = os.getenv("SMTP_PASSWORD", "")
    
    NEXUS_URL: str = os.getenv("NEXUS_URL", "")
    NEXUS_REPOSITORY: str = os.getenv("NEXUS_REPOSITORY", "")
    
    @field_validator("BACKEND_CORS_ORIGINS", mode="before")
    @classmethod
    def assemble_cors_origins(cls, v: Union[str, List[str]]) -> Union[List[str], str]:
        if isinstance(v, str) and not v.startswith("["):
            return [i.strip() for i in v.split(",")]
        elif isinstance(v, (list, str)):
            return v
        raise ValueError(v)
    
    class Config:
        env_file = ".env"
        case_sensitive = True

settings = Settings()