import os
import time
import html
import json
import random
import logging
import asyncio
import tempfile
import functools
import mimetypes
import traceback
from decimal import Decimal
from itertools import zip_longest
from urllib.parse import urlparse, urlunparse, urljoin
import yaml
import asyncpraw
import aiohttp
import aiocron
from bs4 import BeautifulSoup
from telethon import TelegramClient, events
from telethon.utils import chunks, is_list_like
from telethon.tl.types import DocumentAttributeVideo

mimetypes.init(['mime.types'])
with open('config.yaml') as file:
    config_data = yaml.safe_load(file)

tg_api_id = config_data['telegram']['api_id']
tg_api_hash = config_data['telegram']['api_hash']
bot_token = config_data['telegram'].get('bot_token')

reddit_client_id = config_data['reddit']['client_id']
reddit_client_secret = config_data['reddit']['client_secret']

storage_chat = config_data['config'].get('storage_chat')
storage_msg_id = config_data['config'].get('storage_message_id')
_bkup_subreddits = config_data['config'].get('subreddits')
_send_to_chats = send_to_chats = config_data['config']['send_to_chats']
if isinstance(_send_to_chats, list):
    send_to_chats = dict()
    for i in _send_to_chats:
        j = None
        if isinstance(i, dict):
            j = tuple(i.values())[0]
            i = tuple(i.keys())[0]
        if isinstance(j, list) or not j:
            j = {'subreddits': j, 'cron_duration': config_data['config']['cron_duration'],
                 'allow_selfposts': True, 'allow_nsfw': True,
                 'allow_spoilers': True, 'show_nsfw_warning': True,
                 'show_spoilers_warning': True, 'timeout': None}
        send_to_chats[i] = j
bot_admins = config_data['config']['bot_admins']

logging.basicConfig(level=logging.INFO)
async def main():
    _added_chats = []
    client = await TelegramClient('redditbot', tg_api_id, tg_api_hash).start(bot_token=bot_token)
    client.parse_mode = 'html'
    session = aiohttp.ClientSession()
    reddit = asyncpraw.Reddit(client_id=reddit_client_id, client_secret=reddit_client_secret, user_agent='linux:redditbot:v1.0.0 (by /u/the_blank_x)')

    try:
        if storage_chat and storage_msg_id:
            await (await client.get_messages(storage_chat, ids=storage_msg_id)).download_media('redditbot.json')
        with open('redditbot.json') as file:
            seen_posts = json.load(file)
        if isinstance(seen_posts, list):
            seen_posts = {'version': 0, 'chats': {'global': seen_posts}}
    except BaseException:
        logging.exception('Loading JSON')
        seen_posts = {'version': 0, 'chats': {'global': []}}
        # chat dict: {chatid: [array of submission ids]}

    uploading_lock = asyncio.Lock()
    async def write_seen_posts():
        with open('redditbot.json', 'w') as file:
            json.dump(seen_posts, file)
        if storage_chat and storage_msg_id:
            async with uploading_lock:
                await client.edit_message(storage_chat, storage_msg_id, file='redditbot.json')

    async def add_chat(chat, chat_data):
        global_sp = chat_sp = seen_posts['chats']['global']
        subreddits = chat_data['subreddits']
        if subreddits:
            chat = await client.get_peer_id(chat)
            if str(chat) not in seen_posts['chats']:
                seen_posts['chats'][str(chat)] = []
            chat_sp = seen_posts['chats'][str(chat)]
        else:
            subreddits = _bkup_subreddits.copy()
        cron_duration = chat_data['cron_duration']
        allow_selfposts = chat_data['allow_selfposts']
        allow_nsfw = chat_data['allow_nsfw']
        allow_spoilers = chat_data['allow_spoilers']
        show_nsfw_warning = chat_data['show_nsfw_warning']
        show_spoilers_warning = chat_data['show_spoilers_warning']
        timeout = chat_data.get('timeout')

        give_ups = set()
        async def _get_submission(unique_id):
            while unique_id not in give_ups:
                subreddit = await reddit.subreddit(random.choice(subreddits))
                random_post = await subreddit.random()
                cpid = cpp = None
                if random_post is None:
                    async for submission in subreddit.hot():
                        if unique_id in give_ups:
                            return
                        cpid = getattr(submission, 'crosspost_parent', None)
                        if cpid and getattr(random_post, 'crosspost_parent_list', None):
                            cpid = cpid[3:]
                        if submission.id in chat_sp + global_sp or cpid in chat_sp + global_sp:
                            continue
                        if not (allow_selfposts and allow_nsfw and allow_spoilers):
                            is_self = submission.is_self
                            nsfw = submission.over_18
                            spoilers = submission.spoiler
                            if cpid:
                                cpp = await reddit.submission(cpid)
                                if not allow_selfposts:
                                    is_self = cpp.is_self
                                if not (nsfw and allow_nsfw):
                                    nsfw = cpp.over_18
                                if not (spoilers and allow_spoilers):
                                    nsfw = cpp.spoiler
                            if is_self and not allow_selfposts:
                                continue
                            if nsfw and not allow_nsfw:
                                continue
                            if spoilers and not allow_spoilers:
                                continue
                        random_post = submission
                        break
                cpid = getattr(random_post, 'crosspost_parent', None)
                if cpid and getattr(random_post, 'crosspost_parent_list', None):
                    cpid = cpid[3:]
                if random_post.id in chat_sp + global_sp or cpid in chat_sp + global_sp:
                    continue
                if not (allow_selfposts and allow_nsfw and allow_spoilers):
                    is_self = random_post.is_self
                    nsfw = random_post.over_18
                    spoilers = random_post.spoiler
                    if cpid and not cpp:
                        cpp = await reddit.submission(cpid)
                    if cpid:
                        if not allow_selfposts:
                            is_self = cpp.is_self
                        if not (nsfw and allow_nsfw):
                            nsfw = cpp.over_18
                        if not (spoilers and allow_spoilers):
                            nsfw = cpp.spoiler
                    if is_self and not allow_selfposts:
                        continue
                    if nsfw and not allow_nsfw:
                        continue
                    if spoilers and not allow_spoilers:
                        continue
                chat_sp.append(cpid or random_post.id)
                print(random_post.id, random_post.shortlink)
                return random_post, cpp

        @aiocron.crontab(cron_duration)
        async def start_post():
            while True:
                unique_id = time.time()
                try:
                    random_post, cpp = await asyncio.wait_for(_get_submission(unique_id), timeout)
                except asyncio.TimeoutError:
                    give_ups.add(unique_id)
                    logging.error('%s timed out', chat)
                    for i in bot_admins:
                        await client.send_message(i, f'{chat} timed out')
                    break
                except BaseException:
                    give_ups.add(unique_id)
                    logging.exception(chat)
                    for i in bot_admins:
                        await client.send_message(i, f'{chat}\n{traceback.format_exc()}')
                else:
                    try:
                        await _actual_start_post(random_post, [chat], cpp, show_nsfw_warning, show_spoilers_warning)
                    except BaseException:
                        logging.exception(random_post.id)
                        for i in bot_admins:
                            await client.send_message(i, f'{random_post.id}\n{traceback.format_exc()}', parse_mode=None)
                    else:
                        break
            await write_seen_posts()

        _added_chats.append(start_post)

    for chat in send_to_chats:
        print(chat, send_to_chats[chat])
        await add_chat(chat, send_to_chats[chat])

    async def _start_broadcast(text, file, chats):
        for chat in chats:
            for i in chunks(zip_longest(text, file or []), 10):
                j, k = zip(*i)
                if not any(k):
                    k = None
                if not k and len(j) == 1:
                    j = j[0]
                if is_list_like(j) and is_list_like(k):
                    if len(j) == 1 and len(k) == 1:
                        j = j[0]
                        k = k[0]
                attributes = []
                try:
                    mimetype = (await _get_file_mimetype(k)) if k else ''
                except TypeError:
                    # (for now) telethon doesn't easily support attributes for grouped media
                    mimetype = ''
                thumb = None
                if mimetype.startswith('video/'):
                    try:
                        data = await _get_video_data(k)
                        duration = int(Decimal(data['format']['duration']))
                        w = h = None
                        for l in data['streams']:
                            if l['codec_type'] != 'video':
                                continue
                            w = l['width']
                            h = l['height']
                            break
                    except Exception:
                        logging.exception('Exception when getting video data')
                    else:
                        attributes.append(DocumentAttributeVideo(duration, w, h, supports_streaming=mimetype == 'video/mp4' or None))
                    dn, _ = os.path.split(k)
                    try:
                        nthumb = os.path.join(dn, f'{time.time()}.jpg')
                        if await _make_thumbnail(nthumb, k):
                            thumb = nthumb
                    except Exception:
                        logging.exception('Exception while making thumbnail')
                await client.send_message(chat, j, file=k, link_preview=False, attributes=attributes, thumb=thumb)

    async def _get_video_data(filename):
        proc = await asyncio.create_subprocess_exec('ffprobe', '-show_format', '-show_streams', '-print_format', 'json', filename, stdout=asyncio.subprocess.PIPE)
        stdout, _ = await proc.communicate()
        data = json.loads(stdout)
        if data.get('format') and 'duration' not in data['format']:
            with tempfile.NamedTemporaryFile() as tempf:
                proc = await asyncio.create_subprocess_exec('ffmpeg', '-an', '-sn', '-i', filename, '-c', 'copy', '-f', 'matroska', tempf.name)
                await proc.communicate()
                ndata = await _get_video_data(tempf.name)
                if ndata.get('format') and 'duration' in ndata['format']:
                    data['format']['duration'] = ndata['format']['duration']
        return data

    async def _make_thumbnail(filename, video):
        data = await _get_video_data(video)
        if not data.get('format'):
            return False
        if data['format'].get('duration') is None:
            return False
        for i in (0, 5, 10, 15):
            if i and data['format']['duration'] > i:
                continue
            proc = await asyncio.create_subprocess_exec('ffmpeg', '-an', '-sn', '-ss', str(i), '-i', video, '-frames:v', '1', filename)
            await proc.communicate()
            if not proc.returncode:
                return True
        return False

    async def _download_file(filename, url):
        print(url)
        async with session.get(url) as resp:
            with open(filename, 'wb') as file:
                while True:
                    chunk = await resp.content.read(10)
                    if not chunk:
                        break
                    file.write(chunk)

    async def _get_file_mimetype(filename):
        mimetype = mimetypes.guess_type(filename, strict=False)[0]
        if not mimetype:
            proc = await asyncio.create_subprocess_exec('file', '--brief', '--mime-type', filename, stdout=asyncio.subprocess.PIPE)
            stdout, _ = await proc.communicate()
            mimetype = stdout.decode().strip()
        return mimetype or ''

    async def _get_file_ext(filename):
        proc = await asyncio.create_subprocess_exec('file', '--brief', '--extension', filename, stdout=asyncio.subprocess.PIPE)
        stdout, _ = await proc.communicate()
        ext = stdout.decode().strip().split('/', maxsplit=1)[0]
        if not ext or ext == '???':
            mimetype = await _get_file_mimetype(filename)
            ext = mimetypes.guess_extension(mimetype, strict=False) or '.bin'
        if not ext.startswith('.'):
            ext = '.' + ext
        return ext

    async def _actual_start_post(random_post, chats, cpp=None, snw=None, ssw=None):
        text = f'<a href="{random_post.shortlink}">{html.escape(random_post.title)}</a>'
        nsfw = random_post.over_18
        spoilers = random_post.spoiler
        cpid = getattr(random_post, 'crosspost_parent', None)
        if cpid and getattr(random_post, 'crosspost_parent_list', None) and not cpp:
            cpp = await reddit.submission(cpid[3:])
        if cpp:
            random_post = cpp
            if snw and not nsfw:
                nsfw = random_post.over_18
            if ssw and not spoilers:
                spoilers = random_post.spoiler
            text += f' (crosspost of <a href="{random_post.shortlink}">{html.escape(random_post.title)}</a>)'
        if spoilers and ssw:
            text = '🙈🙈🙈 SPOILERS 🙈🙈🙈\n' + text
        if nsfw and snw:
            text = '🔞🔞🔞 18+ / NSFW 🔞🔞🔞\n' + text
        if not random_post.is_self:
            with tempfile.TemporaryDirectory() as tempdir:
                url = random_post.url
                filename = os.path.join(tempdir, str(time.time()))
                files = [filename]
                captions = [text]
                if random_post.is_video:
                    ffmpeg_exists = any(True for i in os.environ.get('PATH', '').split(':') if os.path.exists(os.path.join(i, 'ffmpeg')))
                    reddit_video = random_post.secure_media['reddit_video']
                    for i in ('hls_url', 'dash_url'):
                        if not ffmpeg_exists:
                            continue
                        if not reddit_video.get(i):
                            continue
                        url = reddit_video[i]
                        print(url)
                        proc = await asyncio.create_subprocess_exec('ffmpeg', '-nostdin', '-y', '-i', url, '-c', 'copy', '-f', 'mp4', filename)
                        await proc.communicate()
                        if not proc.returncode:
                            url = None
                            break
                    else:
                        if 'fallback_url' in reddit_video:
                            url = reddit_video['fallback_url']
                elif getattr(random_post, 'is_gallery', None):
                    files = []
                    captions = []
                    if getattr(random_post, 'gallery_data', None):
                        gallery_keys = map(lambda i: i[1], sorted(map(lambda i: (i['id'], i['media_id']), random_post.gallery_data['items']), key=lambda i: i[0]))
                    else:
                        gallery_keys = random_post.media_metadata.keys()
                    for a, i in enumerate(gallery_keys):
                        i = random_post.media_metadata[i]
                        if i['status'] == 'valid':
                            filename = os.path.join(tempdir, str(time.time()))
                            for j in ('u', 'mp4', 'gif'):
                                if j in i['s']:
                                    await _download_file(filename, i['s'][j])
                                    break
                            captions.append(f'{text}\n#{a + 1}')
                            files.append(filename)
                    url = None
                if url:
                    parsed = list(urlparse(url))
                    splitted = os.path.splitext(parsed[2])
                    domain = getattr(random_post, 'domain', parsed[1])
                    preview = getattr(random_post, 'preview', None)
                    if domain == 'imgur.com' or domain.endswith('.imgur.com'):
                        parsed[1] = 'i.imgur.com'
                        if parsed[2].startswith('/a/') or parsed[2].startswith('/gallery/'):
                            albumid = os.path.splitext(os.path.split(parsed[2].rstrip('/'))[1])[0]
                            async with session.get(f'https://imgur.com/ajaxalbums/getimages/{albumid}/hit.json?all=true') as resp:
                                apidata = (await resp.json())['data']
                            if apidata['count'] == 1:
                                parsed[2] = apidata['images'][0]['hash'] + apidata['images'][0]['ext']
                                desc = apidata['images'][0]['description']
                                if desc:
                                    captions[0] += '\n' + html.escape(desc)
                            else:
                                files = []
                                captions = []
                                for a, i in enumerate(apidata['images']):
                                    to_append = f'#{a + 1}'
                                    desc = i['description']
                                    if desc:
                                        to_append += ': ' + desc.strip()
                                    caplength = 1023 - len(client.parse_mode.parse(text)[0])
                                    captext = to_append[:caplength]
                                    if len(captext) >= caplength:
                                        captext = captext[:-1]
                                        captext += '…'
                                    captions.append(text + '\n' + html.escape(captext))
                                    filename = os.path.join(tempdir, str(time.time()))
                                    await _download_file(filename, f'https://i.imgur.com/{i["hash"]}{i["ext"]}')
                                    files.append(filename)
                                url = None
                        if splitted[1] == '.gifv':
                            parsed[2] = splitted[0] + '.mp4'
                        if url:
                            url = urlunparse(parsed)
                    elif domain == 'gfycat.com':
                        async with session.get(f'https://api.gfycat.com/v1/gfycats/{splitted[0]}') as resp:
                            apidata = await resp.json()
                        gfyitem = apidata.get('gfyItem')
                        if gfyitem:
                            url = gfyitem.get('mp4Url', url)
                    elif random_post.is_reddit_media_domain and preview:
                        ppreview = preview['images'][0]
                        if splitted[1] == '.gif':
                            for i in ('mp4', 'gif'):
                                if i in ppreview['variants']:
                                    url = ppreview['variants'][i]['source']['url']
                                    break
                        elif random_post.is_video:
                            url = ppreview['source']['url']
                if url:
                    url = urlunparse(urlparse(url, 'https'))
                    await _download_file(filename, url)
                    mimetype = await _get_file_mimetype(filename)
                    if mimetype.startswith('image') and preview and preview.get('enabled'):
                        preview = preview['images'][0]
                        urls = [i['url'] for i in preview['resolutions']]
                        urls.append(preview['source']['url'])
                        urls.reverse()
                        for url in urls:
                            if os.path.getsize(filename) < 10000000:
                                break
                            url = urlunparse(urlparse(url, 'https'))
                            await _download_file(filename, url)
                    ext = await _get_file_ext(filename)
                    if ext in ('.htm', '.html'):
                        with open(filename) as file:
                            soup = BeautifulSoup(file.read())
                        ptitle = soup.find(lambda tag: tag.name == 'meta' and tag.attrs.get('property') == 'og:title' and tag.attrs.get('content')) or soup.find('title')
                        if ptitle:
                            ptitle = ptitle.attrs.get('content', ptitle.text).strip()
                        pdesc = soup.find(lambda tag: tag.name == 'meta' and tag.attrs.get('property') == 'og:description' and tag.attrs.get('content')) or soup.find(lambda tag: tag.name == 'meta' and tag.attrs.get('name') == 'description' and tag.attrs.get('content'))
                        if pdesc:
                            pdesc = pdesc.attrs.get('content', pdesc.text).strip()
                        pmedia = soup.find(lambda tag: tag.name == 'meta' and tag.attrs.get('property') == 'og:video' and tag.attrs.get('content')) or soup.find(lambda tag: tag.name == 'meta' and tag.attrs.get('property') == 'og:image' and tag.attrs.get('content'))
                        if pmedia:
                            pmedia = pmedia.attrs.get('content', '').strip()
                        tat = f'{text}\n\nURL: '
                        if ptitle:
                            tat += f'<a href="{url}">{html.escape(ptitle)}</a>'
                        else:
                            tat += url
                        files = []
                        if pmedia:
                            pmedia = urljoin(url, pmedia)
                            await _download_file(filename, pmedia)
                            if await _get_file_mimetype(filename) == 'video/x-m4v':
                                ofilename = filename + '.oc'
                                os.rename(filename, ofilename)
                                proc = await asyncio.create_subprocess_exec('ffmpeg', '-nostdin', '-y', '-i', ofilename, '-c', 'copy', '-f', 'mp4', filename)
                                await proc.communicate()
                                if not proc.returncode:
                                    os.remove(ofilename)
                                else:
                                    os.rename(ofilename, filename)
                                    try:
                                        os.remove(filename)
                                    except FileNotFoundError:
                                        pass
                            files.append(filename)
                        if pdesc:
                            caplength = 1023 if pmedia else 4095
                            caplength -= len(client.parse_mode.parse(tat)[0])
                            captext = pdesc[:caplength]
                            if len(captext) >= caplength:
                                captext = captext[:-1]
                                captext += '…'
                            tat += '\n' + captext
                        captions = [tat]
                for a, i in enumerate(files):
                    ext = await _get_file_ext(i)
                    os.rename(i, i + ext)
                    files[a] = i + ext
                await _start_broadcast(captions, files, chats)
        else:
            if getattr(random_post, 'selftext', None):
                caplength = 4094 - len(client.parse_mode.parse(text)[0])
                text += '\n\n'
                captext = random_post.selftext.strip()[:caplength]
                if len(captext) >= caplength:
                    captext = captext[:-1]
                    captext += '…'
                text += html.escape(captext)
            await _start_broadcast([text], None, chats)

    def register(pattern):
        def wrapper(func):
            @functools.wraps(func)
            @client.on(events.NewMessage(chats=bot_admins, pattern=pattern))
            async def awrapper(e):
                try:
                    await func(e)
                except BaseException:
                    await e.reply(traceback.format_exc(), parse_mode=None)
                    raise
            return awrapper
        return wrapper

    @register('/(start|help)')
    async def start_or_help(e):
        await e.reply(('/start - /help\n'
                       '/help - /start\n'
                       '/poweroff - shuts down bot\n'
                       '/test <submission id> [ns] - tests sending submission'), parse_mode=None)

    @register('/poweroff')
    async def poweroff(e):
        await e.reply('ok')
        await e.client.disconnect()

    @register(r'/test (\S+)(?: ([ns]+))?')
    async def test_post(e):
        await e.reply('ok')
        post = await reddit.submission(e.pattern_match.group(1))
        flags = e.pattern_match.group(2) or ''
        snw = 'n' in flags
        ssw = 's' in flags
        await _actual_start_post(post, [e.chat_id], None, snw, ssw)

#    await asyncio.gather(*[i.func() for i in _added_chats])
    try:
        await client.run_until_disconnected()
    finally:
        await session.close()

if __name__ == '__main__':
    asyncio.run(main())