from flask import Flask, render_template, request, redirect, abort, Response, send_from_directory, url_for, send_file, make_response, jsonify
from flask_cors import CORS
import youtube_dl
import textwrap
import twitter
import pymongo
import requests
import json
import re
import os
import urllib.parse
import urllib.request
import combineImg
from datetime import date,datetime, timedelta
from io import BytesIO

app = Flask(__name__)
CORS(app)

pathregex = re.compile("\\w{1,15}\\/(status|statuses)\\/\\d{2,20}")
generate_embed_user_agents = [
    "facebookexternalhit/1.1",
    "Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/31.0.1650.57 Safari/537.36",
    "Mozilla/5.0 (Windows; U; Windows NT 10.0; en-US; Valve Steam Client/default/1596241936; ) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/79.0.3945.117 Safari/537.36",
    "Mozilla/5.0 (Windows; U; Windows NT 10.0; en-US; Valve Steam Client/default/0; ) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/79.0.3945.117 Safari/537.36", 
    "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_11_1) AppleWebKit/601.2.4 (KHTML, like Gecko) Version/9.0.1 Safari/601.2.4 facebookexternalhit/1.1 Facebot Twitterbot/1.0", 
    "facebookexternalhit/1.1",
    "Mozilla/5.0 (Windows; U; Windows NT 6.1; en-US; Valve Steam FriendsUI Tenfoot/0; ) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/84.0.4147.105 Safari/537.36", 
    "Slackbot-LinkExpanding 1.0 (+https://api.slack.com/robots)", 
    "Mozilla/5.0 (Macintosh; Intel Mac OS X 10.10; rv:38.0) Gecko/20100101 Firefox/38.0", 
    "Mozilla/5.0 (compatible; Discordbot/2.0; +https://discordapp.com)", 
    "TelegramBot (like TwitterBot)", 
    "Mozilla/5.0 (compatible; January/1.0; +https://gitlab.insrt.uk/revolt/january)", 
    "test"]

# Read config from config.json. If it does not exist, create new.
if not os.path.exists("config.json"):
    with open("config.json", "w") as outfile:
        default_config = {
            "config":{
                "link_cache":"json",
                "database":"[url to mongo database goes here]",
                "table":"TwiFix",
                "method":"youtube-dl", 
                "color":"#43B581", 
                "appname": "vxTwitter", 
                "repo": "https://github.com/dylanpdx/BetterTwitFix", 
                "url": "https://vxtwitter.com"
                },
            "api":{"api_key":"[api_key goes here]",
            "api_secret":"[api_secret goes here]",
            "access_token":"[access_token goes here]",
            "access_secret":"[access_secret goes here]"
            }
        }

        json.dump(default_config, outfile, indent=4, sort_keys=True)

    config = default_config
else:
    f = open("config.json")
    config = json.load(f)
    f.close()

# If method is set to API or Hybrid, attempt to auth with the Twitter API
if config['config']['method'] in ('api', 'hybrid'):
    auth = twitter.oauth.OAuth(config['api']['access_token'], config['api']['access_secret'], config['api']['api_key'], config['api']['api_secret'])
    twitter_api = twitter.Twitter(auth=auth)

link_cache_system = config['config']['link_cache']

if link_cache_system == "json":
    link_cache = {}
    if not os.path.exists("config.json"):
        with open("config.json", "w") as outfile:
            default_link_cache = {"test":"test"}
            json.dump(default_link_cache, outfile, indent=4, sort_keys=True)

    try:
        f = open('links.json',)
        link_cache = json.load(f)
    except json.decoder.JSONDecodeError:
        print(" ➤ [ X ] Failed to load cache JSON file. Creating new file.")
        link_cache = {}
    except FileNotFoundError:
        print(" ➤ [ X ] Failed to load cache JSON file. Creating new file.")
        link_cache = {}
    finally:
        f.close()
        
elif link_cache_system == "db":
    client = pymongo.MongoClient(config['config']['database'], connect=False)
    table = config['config']['table']
    db = client[table]

@app.route('/') # If the useragent is discord, return the embed, if not, redirect to configured repo directly
def default():
    user_agent = request.headers.get('user-agent')
    if user_agent in generate_embed_user_agents:
        return message("TwitFix is an attempt to fix twitter video embeds in discord! created by Robin Universe :)\n\n💖\n\nClick me to be redirected to the repo!")
    else:
        return redirect(config['config']['repo'], 301)

@app.route('/oembed.json') #oEmbed endpoint
def oembedend():
    desc  = request.args.get("desc", None)
    user  = request.args.get("user", None)
    link  = request.args.get("link", None)
    ttype = request.args.get("ttype", None)
    return  oEmbedGen(desc, user, link, ttype)

@app.route('/<path:sub_path>') # Default endpoint used by everything
def twitfix(sub_path):
    user_agent = request.headers.get('user-agent')
    match = pathregex.search(sub_path)
    print(request.url)

    if request.url.startswith("https://d.vx"): # Matches d.fx? Try to give the user a direct link
        if user_agent in generate_embed_user_agents:
            print( " ➤ [ D ] d.vx link shown to discord user-agent!")
            if request.url.endswith(".mp4") and "?" not in request.url:
                return dl(sub_path)
            else:
                return message("To use a direct MP4 link in discord, remove anything past '?' and put '.mp4' at the end")
        else:
            print(" ➤ [ R ] Redirect to MP4 using d.fxtwitter.com")
            return dir(sub_path)
    elif request.url.startswith("https://c.vx"):
        twitter_url = sub_path

        if match.start() == 0:
            twitter_url = "https://twitter.com/" + sub_path
        
        if user_agent in generate_embed_user_agents:
            return embedCombined(twitter_url)
    elif request.url.endswith(".mp4") or request.url.endswith("%2Emp4"):
        twitter_url = "https://twitter.com/" + sub_path
        
        if "?" not in request.url:
            clean = twitter_url[:-4]
        else:
            clean = twitter_url

        return dl(clean)

    # elif request.url.endswith(".json") or request.url.endswith("%2Ejson"):
    #     twitter_url = "https://twitter.com/" + sub_path
        
    #     if "?" not in request.url:
    #         clean = twitter_url[:-5]
    #     else:
    #         clean = twitter_url

    #     print( " ➤ [ API ] VNF Json api hit!")

    #     vnf = link_to_vnf_from_api(clean.replace(".json",""))

    #     if user_agent in generate_embed_user_agents:
    #         return message("VNF Data: ( discord useragent preview )\n\n"+ json.dumps(vnf, default=str))
    #     else:
    #         return Response(response=json.dumps(vnf, default=str), status=200, mimetype="application/json")

    elif request.url.endswith("/1") or request.url.endswith("/2") or request.url.endswith("/3") or request.url.endswith("/4") or request.url.endswith("%2F1") or request.url.endswith("%2F2") or request.url.endswith("%2F3") or request.url.endswith("%2F4"):
        twitter_url = "https://twitter.com/" + sub_path
        
        if "?" not in request.url:
            clean = twitter_url[:-2]
        else:
            clean = twitter_url

        image = ( int(request.url[-1]) - 1 )
        return embed_video(clean, image)

    if match is not None:
        twitter_url = sub_path

        if match.start() == 0:
            twitter_url = "https://twitter.com/" + sub_path

        if user_agent in generate_embed_user_agents:
            res = embed_video(twitter_url)
            return res

        else:
            print(" ➤ [ R ] Redirect to " + twitter_url)
            return redirect(twitter_url, 301)
    else:
        return message("This doesn't appear to be a twitter URL")

        
@app.route('/dir/<path:sub_path>') # Try to return a direct link to the MP4 on twitters servers
def dir(sub_path):
    user_agent = request.headers.get('user-agent')
    url   = sub_path
    match = pathregex.search(url)
    if match is not None:
        twitter_url = url

        if match.start() == 0:
            twitter_url = "https://twitter.com/" + url

        if user_agent in generate_embed_user_agents:
            res = embed_video(twitter_url)
            return res

        else:
            print(" ➤ [ R ] Redirect to direct MP4 URL")
            return direct_video(twitter_url)
    else:
        return redirect(url, 301)

@app.route('/favicon.ico') # This shit don't work
def favicon():
    return send_from_directory(os.path.join(app.root_path, 'static'),
                          'favicon.ico',mimetype='image/vnd.microsoft.icon')

@app.route("/rendercombined.png")
def rendercombined():
    # get "imgs" from request arguments
    imgs = request.args.get("imgs", "")
    imgs = imgs.split(",")
    if (len(imgs) == 0 or len(imgs)>4):
        abort(400)
    #check that each image starts with "https://pbs.twimg.com"
    for img in imgs:
        if not img.startswith("https://pbs.twimg.com"):
            abort(400)
    finalImg= combineImg.genImageFromURL(imgs)
    imgIo = BytesIO()
    finalImg.save(imgIo, 'PNG')
    imgIo.seek(0)
    return send_file(imgIo, mimetype='image/png')

def getDefaultTTL():
    return datetime.today().replace(microsecond=0) + timedelta(days=1)

def direct_video(video_link): # Just get a redirect to a MP4 link from any tweet link
    cached_vnf = getVnfFromLinkCache(video_link)
    if cached_vnf == None:
        try:
            vnf = link_to_vnf(video_link)
            addVnfToLinkCache(video_link, vnf)
            return redirect(vnf['url'], 301)
            print(" ➤ [ D ] Redirecting to direct URL: " + vnf['url'])
        except Exception as e:
            print(e)
            return message("Failed to scan your link! This may be due to an incorrect link, private account, or the twitter API itself might be having issues (Check here: https://api.twitterstat.us/)")
    else:
        return redirect(cached_vnf['url'], 301)
        print(" ➤ [ D ] Redirecting to direct URL: " + vnf['url'])

def direct_video_link(video_link): # Just get a redirect to a MP4 link from any tweet link
    cached_vnf = getVnfFromLinkCache(video_link)
    if cached_vnf == None:
        try:
            vnf = link_to_vnf(video_link)
            addVnfToLinkCache(video_link, vnf)
            return vnf['url']
            print(" ➤ [ D ] Redirecting to direct URL: " + vnf['url'])
        except Exception as e:
            print(e)
            return message("Failed to scan your link! This may be due to an incorrect link, private account, or the twitter API itself might be having issues (Check here: https://api.twitterstat.us/)")
    else:
        return cached_vnf['url']
        print(" ➤ [ D ] Redirecting to direct URL: " + vnf['url'])

def embed_video(video_link, image=0): # Return Embed from any tweet link
    cached_vnf = getVnfFromLinkCache(video_link)

    if cached_vnf == None:
        try:
            vnf = link_to_vnf(video_link)
            addVnfToLinkCache(video_link, vnf)
            return embed(video_link, vnf, image)

        except Exception as e:
            print(e)
            return message("Failed to scan your link! This may be due to an incorrect link, private account, or the twitter API itself might be having issues (Check here: https://api.twitterstat.us/)")
    else:
        return embed(video_link, cached_vnf, image)

def tweetInfo(url, tweet="", desc="", thumb="", uploader="", screen_name="", pfp="", tweetType="", images="", hits=0, likes=0, rts=0, time="", qrt={}, nsfw=False,ttl=getDefaultTTL()): # Return a dict of video info with default values
    vnf = {
        "tweet"         : tweet,
        "url"           : url,
        "description"   : desc,
        "thumbnail"     : thumb,
        "uploader"      : uploader,
        "screen_name"   : screen_name,
        "pfp"           : pfp,
        "type"          : tweetType,
        "images"        : images,
        "hits"          : hits,
        "likes"         : likes,
        "rts"           : rts,
        "time"          : time,
        "qrt"           : qrt,
        "nsfw"          : nsfw,
        "ttl"           : ttl
    }
    return vnf

def link_to_vnf_from_api(video_link):
    print(" ➤ [ + ] Attempting to download tweet info from Twitter API")
    twid = int(re.sub(r'\?.*$','',video_link.rsplit("/", 1)[-1])) # gets the tweet ID as a int from the passed url
    tweet = twitter_api.statuses.show(_id=twid, tweet_mode="extended")
    # For when I need to poke around and see what a tweet looks like
    #print(tweet)
    imgs = ["","","","", ""]
    print(" ➤ [ + ] Tweet Type: " + tweetType(tweet))
    # Check to see if tweet has a video, if not, make the url passed to the VNF the first t.co link in the tweet
    if tweetType(tweet) == "Video":
        if tweet['extended_entities']['media'][0]['video_info']['variants']:
            best_bitrate = 0
            thumb = tweet['extended_entities']['media'][0]['media_url']
            for video in tweet['extended_entities']['media'][0]['video_info']['variants']:
                if video['content_type'] == "video/mp4" and video['bitrate'] > best_bitrate:
                    url = video['url']
                    best_bitrate = video['bitrate']
    elif tweetType(tweet) == "Text":
        url   = ""
        thumb = ""
    else:
        imgs = ["","","","", ""]
        i = 0
        for media in tweet['extended_entities']['media']:
            imgs[i] = media['media_url_https']
            i = i + 1

        #print(imgs)
        imgs[4] = str(i)
        url   = ""
        images= imgs
        thumb = tweet['extended_entities']['media'][0]['media_url_https']

    qrt = {}

    if 'quoted_status' in tweet:
        qrt['desc']       = tweet['quoted_status']['full_text']
        qrt['handle']     = tweet['quoted_status']['user']['name']
        qrt['screen_name'] = tweet['quoted_status']['user']['screen_name']

    text = tweet['full_text']

    if 'possibly_sensitive' in tweet:
        nsfw = tweet['possibly_sensitive']
    else:
        nsfw = False

    vnf = tweetInfo(
        url, 
        video_link, 
        text, thumb, 
        tweet['user']['name'], 
        tweet['user']['screen_name'], 
        tweet['user']['profile_image_url'], 
        tweetType(tweet), 
        likes=tweet['favorite_count'], 
        rts=tweet['retweet_count'], 
        time=tweet['created_at'], 
        qrt=qrt, 
        images=imgs,
        nsfw=nsfw
        )
        
    return vnf

def link_to_vnf_from_youtubedl(video_link):
    print(" ➤ [ X ] Attempting to download tweet info via YoutubeDL: " + video_link)
    with youtube_dl.YoutubeDL({'outtmpl': '%(id)s.%(ext)s'}) as ydl:
        result = ydl.extract_info(video_link, download=False)
        vnf    = tweetInfo(result['url'], video_link, result['description'].rsplit(' ',1)[0], result['thumbnail'], result['uploader'])
        return vnf

def link_to_vnf(video_link): # Return a VideoInfo object or die trying
    if config['config']['method'] == 'hybrid':
        try:
            return link_to_vnf_from_api(video_link)
        except Exception as e:
            print(" ➤ [ !!! ] API Failed")
            print(e)
            return link_to_vnf_from_youtubedl(video_link)
    elif config['config']['method'] == 'api':
        try:
            return link_to_vnf_from_api(video_link)
        except Exception as e:
            print(" ➤ [ X ] API Failed")
            print(e)
            return None
    elif config['config']['method'] == 'youtube-dl':
        try:
            return link_to_vnf_from_youtubedl(video_link)
        except Exception as e:
            print(" ➤ [ X ] Youtube-DL Failed")
            print(e)
            return None
    else:
        print("Please set the method key in your config file to 'api' 'youtube-dl' or 'hybrid'")
        return None

def getVnfFromLinkCache(video_link):
    if link_cache_system == "db":
        collection = db.linkCache
        vnf        = collection.find_one({'tweet': video_link})
        # print(vnf)
        if vnf != None: 
            hits   = ( vnf['hits'] + 1 ) 
            print(" ➤ [ ✔ ] Link located in DB cache. " + "hits on this link so far: [" + str(hits) + "]")
            query  = { 'tweet': video_link }
            change = { "$set" : { "hits" : hits } }
            out    = db.linkCache.update_one(query, change)
            return vnf
        else:
            print(" ➤ [ X ] Link not in DB cache")
            return None
    elif link_cache_system == "json":
        if video_link in link_cache:
            print("Link located in json cache")
            vnf = link_cache[video_link]
            return vnf
        else:
            print(" ➤ [ X ] Link not in json cache")
            return None

def serializeUnknown(obj):
    if isinstance(obj, (datetime, date)):
        return obj.isoformat()
    raise TypeError ("Type %s not serializable" % type(obj))

def addVnfToLinkCache(video_link, vnf):
    try:
        if link_cache_system == "db":
                out = db.linkCache.insert_one(vnf)
                print(" ➤ [ + ] Link added to DB cache ")
                return True
        elif link_cache_system == "json":
            link_cache[video_link] = vnf
            with open("links.json", "w") as outfile: 
                json.dump(link_cache, outfile, indent=4, sort_keys=True, default=serializeUnknown)
                return None
    except Exception:
        print(" ➤ [ X ] Failed to add link to DB cache")
        return None

def message(text):
    return render_template(
        'default.html', 
        message = text, 
        color   = config['config']['color'], 
        appname = config['config']['appname'], 
        repo    = config['config']['repo'], 
        url     = config['config']['url'] )

def embed(video_link, vnf, image):
    print(" ➤ [ E ] Embedding " + vnf['type'] + ": " + vnf['url'])
    
    desc    = re.sub(r' http.*t\.co\S+', '', vnf['description'])
    urlUser = urllib.parse.quote(vnf['uploader'])
    urlDesc = urllib.parse.quote(desc)
    urlLink = urllib.parse.quote(video_link)
    likeDisplay = ("\n\n💖 " + str(vnf['likes']) + " 🔁 " + str(vnf['rts']) + "\n")
    
    try:
        if vnf['type'] == "":
            desc = desc
        elif vnf['type'] == "Video":
            desc = desc
        elif vnf['qrt'] == {}: # Check if this is a QRT and modify the description
            desc = (desc + likeDisplay)
        else:
            qrtDisplay = ("\n─────────────\n ➤ QRT of " + vnf['qrt']['handle'] + " (@" + vnf['qrt']['screen_name'] + "):\n─────────────\n'" + vnf['qrt']['desc'] + "'")
            desc = (desc + qrtDisplay +  likeDisplay)
    except:
        vnf['likes'] = 0; vnf['rts'] = 0; vnf['time'] = 0
        print(' ➤ [ X ] Failed QRT check - old VNF object')
    appNamePost = ""
    if vnf['type'] == "Text": # Change the template based on tweet type
        template = 'text.html'
    if vnf['type'] == "Image":
        if vnf['images'][4]!="1":
            appNamePost = " - Image " + str(image+1) + "/" + str(vnf['images'][4])
        image = vnf['images'][image]
        template = 'image.html'
    if vnf['type'] == "Video":
        urlDesc = urllib.parse.quote(textwrap.shorten(desc, width=220, placeholder="..."))
        template = 'video.html'
    if vnf['type'] == "":
        urlDesc  = urllib.parse.quote(textwrap.shorten(desc, width=220, placeholder="..."))
        template = 'video.html'
        
    color = "#7FFFD4" # Green

    if vnf['nsfw'] == True:
        color = "#800020" # Red

    return render_template(
        template, 
        likes      = vnf['likes'], 
        rts        = vnf['rts'], 
        time       = vnf['time'], 
        screenName = vnf['screen_name'], 
        vidlink    = vnf['url'], 
        pfp        = vnf['pfp'],  
        vidurl     = vnf['url'], 
        desc       = desc,
        pic        = image,
        user       = vnf['uploader'], 
        video_link = video_link, 
        color      = color, 
        appname    = config['config']['appname']+appNamePost, 
        repo       = config['config']['repo'], 
        url        = config['config']['url'], 
        urlDesc    = urlDesc, 
        urlUser    = urlUser, 
        urlLink    = urlLink,
        tweetLink  = vnf['tweet'] )


def embedCombined(video_link):
    cached_vnf = getVnfFromLinkCache(video_link)

    if cached_vnf == None:
        try:
            vnf = link_to_vnf(video_link)
            addVnfToLinkCache(video_link, vnf)
            return embedCombinedVnf(video_link, vnf)

        except Exception as e:
            print(e)
            return message("Failed to scan your link! This may be due to an incorrect link, private account, or the twitter API itself might be having issues (Check here: https://api.twitterstat.us/)")
    else:
        return embedCombinedVnf(video_link, cached_vnf)

def embedCombinedVnf(video_link,vnf):
    if vnf['type'] != "Image":
        return embed(video_link, vnf, 0)
    desc    = re.sub(r' http.*t\.co\S+', '', vnf['description'])
    urlUser = urllib.parse.quote(vnf['uploader'])
    urlDesc = urllib.parse.quote(desc)
    urlLink = urllib.parse.quote(video_link)
    likeDisplay = ("\n\n💖 " + str(vnf['likes']) + " 🔁 " + str(vnf['rts']) + "\n")

    if vnf['qrt'] == {}: # Check if this is a QRT and modify the description
            desc = (desc + likeDisplay)
    else:
        qrtDisplay = ("\n─────────────\n ➤ QRT of " + vnf['qrt']['handle'] + " (@" + vnf['qrt']['screen_name'] + "):\n─────────────\n'" + vnf['qrt']['desc'] + "'")
        desc = (desc + qrtDisplay +  likeDisplay)

    color = "#7FFFD4" # Green

    if vnf['nsfw'] == True:
        color = "#800020" # Red
    image = "https://vxtwitter.com/rendercombined.png?imgs="
    for i in range(0,int(vnf['images'][4])):
        image = image + vnf['images'][i] + ","
    image = image[:-1] # Remove last comma
    return render_template(
        'image.html', 
        likes      = vnf['likes'], 
        rts        = vnf['rts'], 
        time       = vnf['time'], 
        screenName = vnf['screen_name'], 
        vidlink    = vnf['url'], 
        pfp        = vnf['pfp'],  
        vidurl     = vnf['url'], 
        desc       = desc,
        pic        = image,
        user       = vnf['uploader'], 
        video_link = video_link, 
        color      = color, 
        appname    = config['config']['appname'], 
        repo       = config['config']['repo'], 
        url        = config['config']['url'], 
        urlDesc    = urlDesc, 
        urlUser    = urlUser, 
        urlLink    = urlLink,
        tweetLink  = vnf['tweet'] )


def tweetType(tweet): # Are we dealing with a Video, Image, or Text tweet?
    if 'extended_entities' in tweet:
        if 'video_info' in tweet['extended_entities']['media'][0]:
            out = "Video"
        else:
            out = "Image"
    else:
        out = "Text"

    return out


def oEmbedGen(description, user, video_link, ttype):
    out = {
            "type"          : ttype,
            "version"       : "1.0",
            "provider_name" : config['config']['appname'],
            "provider_url"  : config['config']['repo'],
            "title"         : description,
            "author_name"   : user,
            "author_url"    : video_link
            }

    return out

if __name__ == "__main__":
    app.config['SERVER_NAME']='localhost:80'
    app.run(host='0.0.0.0')