#!/usr/bin/python3

import feedparser
import confuse
import redis
import time
import json
import imgkit

from diff_match_patch import diff_match_patch
import difflib

from pprint import pprint
import hashlib


#
# Idea block:
#
#	Můžeme zkusit ke každému ID článku přidat taky hash obsahu, s tím že v začátku budeme kontrolovat jenom změnu hashe a až pak obsah stringů. 
#	Ale nevím jestli to bude reálně efektivnější
#
#	Teď budeme kontrolovat jen titulky, ale postupně můžeme přidat i description článku

config = confuse.Configuration('headline', __name__)
config.set_file('config.yaml')

dmp = diff_match_patch()

rc = redis.Redis(host='localhost', port=6379, db=0)

image_options = {
	'width': '450',
}


def write_article(article, rc):
	rval = json.dumps(article['content'])
	rc.set(article['rss_id'], rval)


def process_diff(diff, article):
	dmp.diff_cleanupSemantic(diff)
	html_diff = dmp.diff_prettyHtml(diff)
	filename = hashlib.md5(article['rss_id'].encode()).hexdigest() + ".jpg"
	image = imgkit.from_string(html_diff, filename, options = {'width': '450'})
	return(True)


def process_item(article, rc):
	if rc.exists(article['rss_id']):
		old = json.loads(rc.get(article['rss_id']))
		new = article['content']
		if old['title'] != new['title']:
			print('Article changed. Fuck the world.')
			diff = dmp.diff_main(old['title'], new['title'])
			process_diff(diff, article)
			#write_article(article_rc)
			return(True)
		else:
			# Article is the same. All good!
			return(True)
	else:
		# Article is new, just create it and exit
		write_article(article, rc)



article_count = 0
for feed in config['feeds']:
	rss_source = str(feed['rss_source'])
	unique_tag = str(feed['unique_tag'])
	name = str(feed['name'])

	rss = feedparser.parse(rss_source)

	for item in rss['entries']:
		rss_id = item[unique_tag]
		title = item['title']
		description = item['description']
		published = time.strftime('%Y:%m:%d %H:%M:%S %Z %z', item['published_parsed'])
		link = item['link']
		article_data = {
			'title'		:	title,
			'description':	description,
			'published'	:	published,
			'link'		:	link,
			'medium'	:	name
		}
		article = {
			'rss_id'	: rss_id, 
			'content'	: article_data
		}
		article_count += 1
		process_item(article, rc)
print("Processed articles:")
print(article_count)