#!/usr/bin/env python3
# -*- encoding: utf-8 -*-

import json
import os
from concurrent.futures import ProcessPoolExecutor as PoolExecutor
from pathlib import Path
from urllib.error import ContentTooShortError, HTTPError, URLError

from bs4 import BeautifulSoup as _BS

from .system import simpleDownloader
from .system.subredditTools import (GATEWAY_LINK_ARGS, build_gateway_link,
                                    getEmptySubredditData,
                                    getSubredditPageJsonInfo)


def BeautifulSoup(data): return _BS(data, 'html5lib')

simpleDownloader.setCookies({'over18':1})

wdir = os.path.abspath('.')

def process_subreddit(subreddit):
    simpleDownloader.setCookies({'over18':1})
    srp = os.path.abspath(os.path.join(wdir, 'r', subreddit))
    #if subreddit!='yiff': continue
    nextpage = build_gateway_link(subreddit)
    srdt = getEmptySubredditData(subreddit)
    try:
        with open(os.path.join(srp, 'subreddit.json')) as f:
            srdt = json.loads(f.read())
    except: pass
    #srdt = getEmptySubredditData(subreddit)
    pageno = 0
    ygst = srdt['date_first']
    jsonPageSr = None
    while nextpage:
        pageno+=1
        print(('/r/{0:<20} loading page #%05d'%pageno).format(subreddit))
        print(' >> %s'%(nextpage.replace(GATEWAY_LINK_ARGS, '[...]'),))
        redditBytes = None
        try:
            redditBytes = simpleDownloader.getUrlBytes(nextpage)
        except (HTTPError, URLError, ContentTooShortError) as e:
            print(" >> HTTP Error with code: Skipping...")
            break
        if redditBytes is None:
            print(" >> HTTP Error: Skipping...")
            break
        # bs = BeautifulSoup(redditBytes)
        jsonPage = json.loads(redditBytes)
        first, last, nextpage, links = getSubredditPageJsonInfo(jsonPage, subreddit, pageno)
        if ygst >= first: #if latest stored post is at same age or older than the latest downloaded post, then we are up-to-date
            nextpage = None
        srdt['date_first'] = max(first, srdt['date_first'])
        srdt['date_last'] = min(last, srdt['date_last'])
        for link in links[::-1]:
            if link not in srdt['links']:
                srdt['links'].append(link)
        srid = next(iter(set.intersection(
            set(jsonPage['subreddits'].keys()),
            set(jsonPage['postFlair'].keys()),
            set(jsonPage['subredditAboutInfo'].keys())
        )))
        jsonPageSr = dict(
            id=srid,
            name=subreddit,
            definition=jsonPage['subreddits'][srid],
            about=jsonPage['subredditAboutInfo'][srid],
            flair=jsonPage['postFlair'][srid],
        )
    with open(os.path.join(srp,'subreddit.json'),'w') as f:
        f.write(json.dumps(srdt, sort_keys=True, indent=2))
    if jsonPageSr is not None:
        with open(os.path.join(srp,'meta.json'),'w') as f:
            f.write(json.dumps(jsonPageSr, sort_keys=True, indent=2))


def main():
    build_summary()
    subreddits = sorted(filter(lambda sr: os.path.isdir(os.path.join(wdir,'r',sr)), os.listdir(os.path.join(wdir,'r'))))
    with PoolExecutor(16) as pe:
        q = list()
        for subreddit in subreddits:
            job = pe.submit(process_subreddit, subreddit)
            q.append(job)
        for job in q:
            job.result()
    build_summary()


def build_summary():
    rjpath = Path(wdir, 'r.json')
    oldsrs = dict()
    if rjpath.exists():
        oldsrs = json.loads(rjpath.read_text())
    srs = dict()
    for srp in Path(wdir, 'r').glob('*/subreddit.json'):
        sr = srp.parent.name.lower()
        try:
            srs[sr] = json.loads(srp.read_text())
        except json.decoder.JSONDecodeError:
            if sr not in oldsrs:
                raise
            else:
                print('Restoring old data for corrupted subrredit %r' % sr)
                srs[sr] = oldsrs[sr]
                srp.write_text(json.dumps(oldsrs[sr], indent=1))
    rjpath.write_text(json.dumps(srs, indent=1))


if __name__ == '__main__':
    main()