Summarise new contracts in Drive and email the key terms

import io
from pypdf import PdfReader
from google.oauth2.credentials import Credentials
from googleapiclient.discovery import build
from googleapiclient.http import MediaIoBaseUpload
from clickruntime import on_trigger, credentials, state, notify, ai, report_fetched

FOLDER_ID = "your-contracts-folder-id"

@on_trigger
def run(event):
    drive = build("drive", "v3", credentials=Credentials(credentials.connection("google", "work")), cache_discovery=False)
    seen = set(state.get("seen") or [])
    files = drive.files().list(q=f"'{FOLDER_ID}' in parents and mimeType='application/pdf' and trashed=false", fields="files(id,name)").execute()["files"]
    new = [f for f in files if f["id"] not in seen]
    report_fetched(len(new))
    if not new:
        return {"summary": "Nothing new"}
    for f in new:
        pdf = drive.files().get_media(fileId=f["id"]).execute()
        text = "".join(p.extract_text() or "" for p in PdfReader(io.BytesIO(pdf)).pages)[:20000]
        summary = ai.generate(f"Summarise this contract: parties, dates, value, payment terms, notice period, unusual clauses.\n{text}", max_output_tokens=600).text
        doc = drive.files().create(body={"name": f"Summary - {f['name']}", "parents": [FOLDER_ID], "mimeType": "application/vnd.google-apps.document"},
                                   media_body=MediaIoBaseUpload(io.BytesIO(summary.encode()), mimetype="text/plain"), fields="webViewLink").execute()
        notify.email_me(f"Contract summary: {f['name']}", f"{summary}\n\n{doc['webViewLink']}")
        seen.add(f["id"])
    state.set("seen", list(seen)[-1000:])
    return {"summarised": len(new)}