import re
import time
import sqlite3
import requests
#from flask_login import current_user, login_required
from flask_login import LoginManager, UserMixin, current_user, login_user, logout_user, login_required
from flask import Blueprint, render_template, request, redirect, flash, url_for, jsonify, g

from ..common.common import *

frontend = Blueprint('reddit', __name__,
    template_folder='templates',
    static_folder='static',
    static_url_path='/static/rd')

@frontend.route('/feed/subreddits')
# disabled for guest user: @login_required
def feed():
    return "reddit feed: TODO"
    if current_user.is_anonymous:
        token = 'guest'
    else:
        token = current_user.token
    page = int(request.args.get('page', 0))
    with sqlite3.connect(cf['global']['database']) as conn:
        c = conn.cursor()
        c.execute("""
	   SELECT videos.id, channel_id, name, title, published, flags.display
	     FROM videos
	     JOIN channels ON videos.channel_id = channels.id
	LEFT JOIN flags ON (videos.id = flags.video_id) AND (flags.user = ?)
	    WHERE channel_id IN 
		  (SELECT channel_id FROM subscriptions WHERE user = ?)
		  AND flags.display IS NOT 'hidden'
	 ORDER BY (display = 'pinned') DESC, crawled DESC
	    LIMIT 36
	   OFFSET 36*?""", (token, token, page))
        rows = [{
            'video_id': video_id,
            'channel_id': channel_id,
            'author': author,
            'title': title,
            'published': published,
            'pinned': display == 'pinned',
        } for (video_id, channel_id, author, title, published, display) in c.fetchall()]
    return render_template('index.html.j2', rows=rows, page=page)

@frontend.route('/manage/subreddits')
# disabled for guest user: @login_required
def subscription_manager():
    return "reddit feed: TODO"
    if current_user.is_anonymous:
        token = 'guest'
    else:
        token = current_user.token
    with sqlite3.connect(cf['global']['database']) as conn:
        #with conn.cursor() as c:
            c = conn.cursor()
            c.execute("""
		  SELECT subscriptions.channel_id, name, 
		         (subscribed_until < datetime('now')) AS obsolete
		    FROM subscriptions
		    left JOIN channels ON channels.id = subscriptions.channel_id
		    left JOIN websub ON channels.id = websub.channel_id
		   WHERE user = ?
		     AND subscriptions.type IN ('channel', 'playlist')
		ORDER BY obsolete=0, name COLLATE NOCASE ASC""", (token,))
            rows = [{
                'channel_id': channel_id,
                'author': author or channel_id,
                'subscribed_until': subscribed_until
            } for (channel_id, author, subscribed_until) in c.fetchall()]
    return render_template('subscription_manager.html.j2', rows=rows)

@frontend.route('/feed/subreddits', methods=['POST'])
@login_required
def feed_post():
    return "reddit feed: TODO"
    token = current_user.token
    action = next(request.form.keys(), None)
    if action in ['pin', 'unpin', 'hide']:
        video_id = request.form.get(action)
        display = {
            'pin': 'pinned',
            'unpin': None,
            'hide': 'hidden',
        }[action]
        with sqlite3.connect(cf['global']['database']) as conn:
            #with conn.cursor() as c:
                c = conn.cursor()
                c.execute("""
			INSERT OR REPLACE INTO flags (user, video_id, display)
			VALUES (?, ?, ?)
                """, (token, video_id, display))
    else:
        flash("unsupported action", "error")
    return redirect(request.url, code=303)

@frontend.route('/manage/subreddits', methods=['POST'])
@login_required
def manage_subscriptions():
    return "reddit feed: TODO"
    token = current_user.token
    if 'subscribe' in request.form:
        channel_id = request.form.get("subscribe")
        match = re.search(r"(UC[A-Za-z0-9_-]{22})", channel_id)
        if match:
            channel_id = match.group(1)
        else:
            match = re.search(r"((?:PL|LL|EC|UU|FL|UL|OL)[A-Za-z0-9_-]{10,})", channel_id)
            if match:  # NOTE: PL-playlists are 32chars, others differ in length.
                flash("playlists not (yet?) supported.", "error")
                return redirect(request.url, code=303) # TODO: dedup redirection
            else:
                flash("not a valid/subscribable URI", "error")
                return redirect(request.url, code=303) # TODO: dedup redirection
        with sqlite3.connect(cf['global']['database']) as conn:
            #with conn.cursor() as c:
                c = conn.cursor()
                c.execute("""
			INSERT OR IGNORE INTO subscriptions (user, channel_id)
			VALUES (?, ?)
                """, (token, channel_id))
                # TODO: sql-error-handling, asynchronically calling update-subs.pl

    elif 'unsubscribe' in request.form:
        channel_id = request.form.get("unsubscribe")
        with sqlite3.connect(cf['global']['database']) as conn:
            #with conn.cursor() as c:
                c = conn.cursor()
                c.execute("""
			DELETE FROM subscriptions
			WHERE user = ? AND channel_id = ?
                """, (token, channel_id))
                # TODO: sql-error-handling, report success

    else:
        flash("unsupported action", "error")

    return redirect(request.url, code=303)

@frontend.route('/r/')
def reddit_index():
    return ""
@frontend.route('/r/<subreddit>')
def reddit(subreddit="videos"):
    count = int(request.args.get('count', 0))
    before = request.args.get('before')
    after = request.args.get('after')
    query = '&'.join([f"{k}={v}" for k,v in [('count',count), ('before',before), ('after',after)] if v])
    r = requests.get(f"https://old.reddit.com/r/{subreddit}.json?{query}", headers={'User-Agent':'Mozilla/5.0'})
    if not r.ok or not 'data' in r.json():
        return r.text+"error retrieving reddit data", 502

    good = [e for e in r.json()['data']['children'] if e['data']['score'] > 1]
    bad  = [e for e in r.json()['data']['children'] if e['data']['score'] <=1]
    videos = []
    for entry in (good+bad):
        e = entry['data']
        if e['domain'] not in ['youtube.com', 'youtu.be', 'invidio.us']:
            continue
        video_id = re.match(r'^https?://(?:www.|m.)?(?:youtube.com/watch\?(?:.*&amp;)?v=|youtu.be/|youtube.com/embed/)([-_0-9A-Za-z]+)', e['url']).group(1)
        if not video_id: continue
        videos.append({
            'video_id': video_id,
            'title': e['title'],
            'url': e['permalink'],
            'n_comments': e['num_comments'],
            'n_karma': e['score'],
        })
    before = r.json()['data']['before']
    after = r.json()['data']['after']
    return render_template('reddit.html.j2', subreddit=subreddit, rows=videos, before=before, after=after, count=count)