from fastapi import Depends, HTTPException, File, UploadFile, APIRouter
import shutil

from uuid import UUID

from .models import Contract, Party
from ..core.routes import get_tenant_db_cursor


signature_router = APIRouter()

@signature_router.get("/{signature_id}", response_description="")
async def get_signature(signature_id: UUID, db=Depends(get_tenant_db_cursor)) -> Party:
    contract = await Contract.find_by_signature_id(db, signature_id)
    signature = contract.get_signature(signature_id)
    return signature

@signature_router.post("/{signature_id}", response_description="")
async def affix_signature(signature_id: UUID, signature_file: UploadFile = File(...), db=Depends(get_tenant_db_cursor)) -> bool:
    contract = await Contract.find_by_signature_id(db, signature_id)

    if not contract:
        raise HTTPException(status_code=404, detail="Contract record not found!")

    signature_index = contract.get_signature_index(signature_id)
    signature = contract.parties[signature_index]

    if signature.signature_affixed:
        raise HTTPException(status_code=400, detail="Signature already affixed")

    with open(f'media/signatures/{signature_id}.png', "wb") as buffer:
        shutil.copyfileobj(signature_file.file, buffer)

    await contract.affix_signature(db, signature_index)
    return True