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import re
from contextlib import asynccontextmanager
from datetime import datetime
from fastapi import Depends
from pydantic import validator
from sqlalchemy.ext.asyncio import create_async_engine
from sqlalchemy.orm import sessionmaker
from sqlmodel import Field, SQLModel
from sqlmodel.ext.asyncio.session import AsyncSession
from scams import scam_categories
from settings import settings
database_url = settings.DATABASE_URL.get_secret_value()
engine = create_async_engine(database_url, echo=settings.is_dev())
async_session = sessionmaker(engine, class_=AsyncSession, expire_on_commit=False)
async def create_db_and_tables():
async with engine.begin() as conn:
await conn.run_sync(SQLModel.metadata.create_all)
@asynccontextmanager
async def get_session() -> AsyncSession:
"""
Dependency function to provide an async database session.
Ensures proper cleanup after use.
"""
async with async_session() as session:
try:
yield session
finally:
await session.close()
class Scammer(SQLModel, table=True):
"""Scammer ORM Model."""
id: int = Field(default=None, primary_key=True)
scammer_mobile: str = Field(index=True, description="Scammer mobile number")
scam_id: int = Field(description="Scam ID of the scam type")
reporter_ordeal: str = Field(description="Summary of the scam")
reporter_mobile: str = Field(description="Reporter mobile number")
created_at: datetime = Field(
default_factory=datetime.utcnow, description="Timestamp of report creation"
)
@validator("scammer_mobile", "reporter_mobile", pre=True)
def validate_mobile_number(cls, value: str) -> str:
"""Validate mobile numbers using a regex."""
pattern = r"^\+\d{1,3}-?\d{6,14}$" # E.164 format
if not re.match(pattern, value):
raise ValueError(f"Invalid mobile number: {value}")
return value
@validator("scam_id")
def validate_scam_id(cls, value: int) -> int:
"""Validate if scam_id exists in scam_categories."""
if value not in scam_categories.keys():
raise ValueError(
f"Invalid scam_id: {value}. Must be one of {list(scam_categories.keys())}."
)
return value
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