import time
start_time = time.time()
import urllib3
from urllib3 import exceptions
from datetime import datetime
from subprocess import call
from mastodon import Mastodon
import threading
import os
import json
import signal
import sys
import os.path
import requests
from requests import exceptions
import operator
import calendar
import psycopg2
from itertools import product

from multiprocessing import Pool, Lock, Process, Queue, current_process, Manager
import multiprocessing

import aiohttp
import aiodns
import asyncio
from aiohttp import ClientError, ClientSession, ClientConnectionError, ClientConnectorError, ClientSSLError, ClientConnectorSSLError, ServerTimeoutError
from asyncio import TimeoutError
import socket
from socket import gaierror, gethostbyname

from decimal import *
getcontext().prec = 2

apis = ['/nodeinfo/2.0?', '/nodeinfo/2.0.json?', '/main/nodeinfo/2.0?', '/api/statusnet/config?', '/api/nodeinfo/2.0.json?', '/api/nodeinfo?', '/api/v1/instance?','/wp-json/nodeinfo/2.0?']

client_exceptions = (
    aiohttp.ClientResponseError,
    aiohttp.ClientConnectionError,
    aiohttp.ClientConnectorError,
    aiohttp.ClientError,
    asyncio.TimeoutError,
    socket.gaierror,
)

now = datetime.now()

###############################################################################
# INITIALISATION
###############################################################################

def is_json(myjson):
    try:
        json_object = json.loads(myjson)
    except ValueError as e:
        return False
    return True

def write_api(server, software, users, alive, api, soft_version):

    insert_sql = "INSERT INTO fediverse(server, updated_at, software, users, alive, users_api, version) VALUES(%s,%s,%s,%s,%s,%s,%s) ON CONFLICT DO NOTHING"
    conn = None

    try:

        conn = psycopg2.connect(database = fediverse_db, user = fediverse_db_user, password = "", host = "/var/run/postgresql", port = "5432")

        cur = conn.cursor()

        cur.execute(insert_sql, (server, now, software, users, alive, api, soft_version))

        cur.execute("UPDATE fediverse SET updated_at=(%s), software=(%s), users=(%s), alive=(%s), users_api=(%s), version=(%s) where server=(%s)", (now, software, users, alive, api, soft_version, server))

        cur.execute("UPDATE world SET checked='t' where server=(%s)", (server,))

        conn.commit()

        cur.close()

    except (Exception, psycopg2.DatabaseError) as error:

        print(error)

    finally:

        if conn is not None:

            conn.close()

async def getsoft(server):

    try:

        socket.gethostbyname(server)

    except socket.gaierror:

        pass
        return

    soft = ''

    url = 'https://' + server

    timeout = aiohttp.ClientTimeout(total=3)
    async with aiohttp.ClientSession(timeout=timeout) as session:
        for api in apis:
            try:
                async with session.get(url+api) as response:
                    if response.status == 200:
                        try:
                            response_json = await response.json()
                        except:
                            pass
            except aiohttp.ClientConnectorError as err:
                pass
            else:
               if response.status == 200 and api != '/api/v1/instance?':
                   try:
                       soft = response_json['software']['name']
                       soft = soft.lower()
                       soft_version = response_json['software']['version']
                       users = response_json['usage']['users']['total']
                       if users > 1000000:
                           return
                       alive = True
                       write_api(server, soft, users, alive, api, soft_version)
                       print("Server " + server + " (" + soft + " " + soft_version + ") is alive!")
                       return
                   except:
                       pass
               if response.status == 200 and soft == '' and api == "/api/v1/instance?":
                   soft = 'mastodon'
                   users = response_json['stats']['user_count']
                   soft_version = response_json['version']
                   if users > 1000000:
                       return
                   alive = True
                   write_api(server, soft, users, alive, api)
                   print("Server " + server + " (" + soft + ") is alive!")

def getserver(server, x):

    server = server[0].rstrip('.').lower()

    if server.find(".") == -1:
        return
    if server.find("@") != -1:
       return
    if server.find("/") != -1:
       return
    if server.find(":") != -1:
       return

    try:

        loop = asyncio.get_event_loop()
        coroutines = [getsoft(server)]
        soft = loop.run_until_complete(asyncio.gather(*coroutines, return_exceptions=True))

    except:

        pass

# Returns the parameter from the specified file
def get_parameter( parameter, file_path ):
    # Check if secrets file exists
    if not os.path.isfile(file_path):
        print("File %s not found, exiting."%file_path)
        sys.exit(0)

    # Find parameter in file
    with open( file_path ) as f:
        for line in f:
            if line.startswith( parameter ):
                return line.replace(parameter + ":", "").strip()

    # Cannot find parameter, exit
    print(file_path + "  Missing parameter %s "%parameter)
    sys.exit(0)


# Load configuration from config file
config_filepath = "config/config.txt"
mastodon_hostname = get_parameter("mastodon_hostname", config_filepath)

# Load database config from db_config file
db_config_filepath = "config/db_config.txt"
fediverse_db = get_parameter("fediverse_db", db_config_filepath)
fediverse_db_user = get_parameter("fediverse_db_user", db_config_filepath)

###############################################################################
# main

if __name__ == '__main__':

    world_servers = []

    try:

        conn = None
        conn = psycopg2.connect(database = fediverse_db, user = fediverse_db_user, password = "", host = "/var/run/postgresql", port = "5432")

        cur = conn.cursor()

        ### get world servers list

        cur.execute("select server from world where checked='f'")

        for row in cur:

            world_servers.append(row[0])

        cur.close()

        print("Remaining servers: " + str(len(world_servers)))

    except (Exception, psycopg2.DatabaseError) as error:

        print(error)

    finally:

        if conn is not None:

            conn.close()

    ###########################################################################
    # multiprocessing!

    m = Manager()
    q = m.Queue()
    z = zip(world_servers)

    serv_number = len(world_servers)

    pool_tuple = [(x, q) for x in z]
    with Pool(processes=64) as pool:
        pool.starmap(getserver, pool_tuple)

    print('Done.')