from flask import url_for, session
from .models import Posts, Threads
from .auth import is_logged_in

def get_post_url(post_id, _anchor=False, external=False):
    post = Posts.find({'id': post_id})
    if not post:
        return ''

    thread = Threads.find({'id': post.thread_id})

    anchor = None if not _anchor else f'post-{post_id}'

    return url_for('threads.thread_by_id', thread_id=thread.id, after=post_id, _external=external, _anchor=anchor)

def dict_to_query_string(d) -> str:
    return '?' + '&'.join([f'{key}={str(value)}' for key, value in d.items()])

def get_csrf_token():
    if not is_logged_in():
        return ''

    return session.get('csrf', '')

def csrf_input():
    return f'<input type="hidden" name="csrf" value="{get_csrf_token()}">'