from flask import Blueprint, redirect, url_for, render_template, request, session, abort

from ..models import Topics, Threads
import math

bp = Blueprint('topics', __name__, url_prefix = '/topics/')

@bp.get('/')
def all_topics():
    topic_list = Topics.get_list()
    return render_template('topics/topics.html', topics=topic_list)

@bp.get('/<slug>/')
def topic(slug):
    topic = Topics.find({'slug': slug})
    if not topic:
        abort(404)
    sort_by = request.args.get('sort_by', default=session.get('sort_by', default='activity'))
    PER_PAGE = 3
    threads_count = Threads.count({'topic_id': topic.id})
    page_count = max(1, math.ceil(threads_count / PER_PAGE))
    try:
        page = max(1, min(int(request.args.get('page', default=1)), page_count))
    except ValueError:
        abort(404)
    return render_template('topics/topic.html', topic=topic, threads=topic.get_threads(PER_PAGE, page, sort_by), sort_by=sort_by, page=page, page_count=page_count)

@bp.get('/<slug>/feed.atom')
def feed(slug):
    return 'stub'