import functions_framework
from google.cloud.firestore_v1.base_query import FieldFilter
from firebase_admin import initialize_app, credentials, firestore
import os
from datetime import datetime

initialize_app()

@functions_framework.http
def clear_users(request):
    """HTTP Cloud Function.
    Args:
        request (flask.Request): The request object.
        <https://flask.palletsprojects.com/en/1.1.x/api/#incoming-request-data>
    Returns:
        The response text, or any set of values that can be turned into a
        Response object using `make_response`
        <https://flask.palletsprojects.com/en/1.1.x/api/#flask.make_response>.
    """
    if request.method == 'OPTIONS':
        headers = {
            'Access-Control-Allow-Origin': '*',
            'Access-Control-Allow-Methods': 'GET',
            'Access-Control-Allow-Headers': 'Content-Type',
            # 'Access-Control-Max-Age': '3600'
        }

        return ('', 204, headers)

    headers = {
        'Access-Control-Allow-Origin': '*'
    }
    
    db = firestore.client()
    source_collection = "patientData"

    # Get all documents from the source collection
    source_docs = db.collection(source_collection).where(filter=FieldFilter("createdAt", ">=", datetime.today().strftime("%Y-%m-%d"))).stream()
    count = 0
    for doc in source_docs:
        # Extract the document ID
        doc_id = doc.id
        print(doc_id)

        # Get the document data
        doc_data = doc.to_dict()

        try:
            # Delete the document from the source collection
            db.collection(source_collection).document(doc_id).delete()
            print(f"Document with ID '{doc_id}' updated")
            count = count + 1
        except Exception as e:
            print(f"Error deleting document with ID '{doc_id}' from the source collection: {e}")
    
    return ('cleared users: {}!'.format(count), 200, headers)