#!/usr/bin/env python3
# -*-coding:UTF-8 -*
"""
The Telegram Feeder Importer Module
================

Process Telegram JSON

"""
import os
import sys
import datetime

sys.path.append(os.environ['AIL_BIN'])
##################################
# Import Project packages
##################################
from importer.feeders.Default import DefaultFeeder
from lib.ConfigLoader import ConfigLoader
from lib.objects.Chats import Chat
from lib.objects import Messages
from lib.objects import UsersAccount
from lib.objects.Usernames import Username

import base64
import io
import gzip
def gunzip_bytes_obj(bytes_obj):
    gunzipped_bytes_obj = None
    try:
        in_ = io.BytesIO()
        in_.write(bytes_obj)
        in_.seek(0)

        with gzip.GzipFile(fileobj=in_, mode='rb') as fo:
            gunzipped_bytes_obj = fo.read()
    except Exception as e:
        print(f'Global; Invalid Gzip file: {e}')

    return gunzipped_bytes_obj

class TelegramFeeder(DefaultFeeder):

    def __init__(self, json_data):
        super().__init__(json_data)
        self.name = 'telegram'

    # define item id
    def get_item_id(self): # TODO rename self.item_id
        # Get message date
        timestamp = self.json_data['meta']['date']['timestamp']  # TODO CREATE DEFAULT TIMESTAMP
        # if self.json_data['meta'].get('date'):
        #     date = datetime.datetime.fromtimestamp( self.json_data['meta']['date']['timestamp'])
        #     date = date.strftime('%Y/%m/%d')
        # else:
        #     date = datetime.date.today().strftime("%Y/%m/%d")
        chat_id = str(self.json_data['meta']['chat']['id'])
        message_id = str(self.json_data['meta']['id'])
        self.item_id = Messages.create_obj_id('telegram', chat_id, message_id, timestamp)  # TODO rename self.item_id
        return self.item_id

    def process_meta(self):
        """
        Process JSON meta field.
        """
        # message chat
        meta = self.json_data['meta']
        mess_id = self.json_data['meta']['id']
        if meta.get('reply_to'):
            reply_to_id = int(meta['reply_to'])
        else:
            reply_to_id = None

        timestamp = meta['date']['timestamp']
        date = datetime.datetime.fromtimestamp(timestamp)
        date = date.strftime('%Y%m%d')

        if self.json_data.get('translation'):
            translation = self.json_data['translation']
        else:
            translation = None
        decoded = base64.standard_b64decode(self.json_data['data'])
        content = gunzip_bytes_obj(decoded)
        message = Messages.create(self.item_id, content, translation=translation)

        if meta.get('chat'):
            chat = Chat(meta['chat']['id'], 'telegram')

            if meta['chat'].get('username'):
                chat_username = Username(meta['chat']['username'], 'telegram')
                chat.update_username_timeline(chat_username.get_global_id(), timestamp)

            # Chat---Message
            chat.add(date)
            chat.add_message(message.get_global_id(), timestamp, mess_id, reply_id=reply_to_id)
        else:
            chat = None

        # message sender
        if meta.get('sender'):  # TODO handle message channel forward - check if is user
            user_id = meta['sender']['id']
            user_account = UsersAccount.UserAccount(user_id, 'telegram')
            # UserAccount---Message
            user_account.add(date, obj=message)
            # UserAccount---Chat
            user_account.add_correlation(chat.type, chat.get_subtype(r_str=True), chat.id)

            if meta['sender'].get('firstname'):
                user_account.set_first_name(meta['sender']['firstname'])
            if meta['sender'].get('lastname'):
                user_account.set_last_name(meta['sender']['lastname'])
            if meta['sender'].get('phone'):
                user_account.set_phone(meta['sender']['phone'])

            if meta['sender'].get('username'):
                username = Username(meta['sender']['username'], 'telegram')
                # TODO timeline or/and correlation ????
                user_account.add_correlation(username.type, username.get_subtype(r_str=True), username.id)
                user_account.update_username_timeline(username.get_global_id(), timestamp)

                # Username---Message
                username.add(date)  # TODO # correlation message ???

                # if chat: # TODO Chat---Username correlation ???
                #     # Chat---Username
                #     chat.add_correlation(username.type, username.get_subtype(r_str=True), username.id)

        # if meta.get('fwd_from'):
            # if meta['fwd_from'].get('post_author') # user first name

        # TODO reply threads ????
        # message edit ????


        return None