"""Shared bounded native schematic upload validation."""
from fastapi import HTTPException
from .config import settings
from .parser.record_decoder import ParseError,detect_format

async def read_schematic(file):
    try:
        name=(file.filename or '').replace('\\','/').rsplit('/',1)[-1]
        name=''.join(c for c in name if c.isprintable())[:255]
        if not name.lower().endswith('.schdoc'):
            raise HTTPException(415,{'code':'unsupported_file_type','message':'Upload a .SchDoc file'})
        body=bytearray()
        while chunk:=await file.read(1024*1024):
            body.extend(chunk)
            if len(body)>settings().max_upload_bytes:
                raise HTTPException(413,{'code':'upload_too_large','message':'Schematic exceeds configured upload size'})
        try:detect_format(bytes(body))
        except ParseError as exc:raise HTTPException(422,{'code':'invalid_schematic','message':str(exc)}) from exc
        return name,bytes(body)
    finally:await file.close()