import time
start_time = time.time()
from six.moves import urllib
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
import operator
import calendar
import psycopg2
from itertools import product

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

updated_at = datetime.now()
peers_api = '/api/v1/instance/peers?'
lemmy_api = '/api/v2/site?'

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

def get_lemmy_server(server):

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

    except:

        pass

def getserver(server):

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

    except:

        pass

async def get_lemmy_peers(server):

    try:

        socket.gethostbyname(server)

    except socket.gaierror:

        return

    url = 'https://' + server

    timeout = aiohttp.ClientTimeout(total=3)
    async with aiohttp.ClientSession(timeout=timeout) as session:

            try:
                async with session.get(url+lemmy_api) as resp:
                    response = await resp.json()
                    if resp.status == 200:
                        try:
                            data = response['federated_instances']['linked']
                            print("Server: " + server + ", " + "federated with " + str(len(data)) + " servers")
                            i = 0
                            while i < len(data):

                                saved_at = datetime.now()
                                insert_sql = "INSERT INTO world(server, federated_with, updated_at, saved_at) VALUES(%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, (data[i], server, updated_at, saved_at,))

                                    conn.commit()

                                    cur.close()

                                except (Exception, psycopg2.DatabaseError) as error:

                                    print(error)

                                finally:

                                    if conn is not None:

                                        conn.close()

                                i += 1

                        except:

                            pass

            except aiohttp.ClientConnectorError as err:

                pass


async def getpeers(server):

    try:

        socket.gethostbyname(server)

    except socket.gaierror:

        return

    url = 'https://' + server

    timeout = aiohttp.ClientTimeout(total=3)

    async with aiohttp.ClientSession(timeout=timeout) as session:

            try:

                async with session.get(url+peers_api) as resp:

                    response = await resp.json()

                    if resp.status == 200:

                        try:

                            response_json = response

                            print("Server: " + server + ", " + "federated with " + str(len(response_json)) + " servers")

                            i = 0

                            while i < len(response_json):

                                saved_at = datetime.now()

                                insert_sql = "INSERT INTO world(server, federated_with, updated_at, saved_at) VALUES(%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, (response_json[i], server, updated_at, saved_at,))

                                    conn.commit()

                                    cur.close()

                                except (Exception, psycopg2.DatabaseError) as error:

                                    print(error)

                                finally:

                                    if conn is not None:

                                        conn.close()

                                i += 1

                        except:

                            pass

            except aiohttp.ClientConnectorError as err:

                pass

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

# 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 secrets from secrets file
secrets_filepath = "secrets/secrets.txt"
uc_client_id     = get_parameter("uc_client_id",     secrets_filepath)
uc_client_secret = get_parameter("uc_client_secret", secrets_filepath)
uc_access_token  = get_parameter("uc_access_token",  secrets_filepath)

# 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)

# Initialise Mastodon API
mastodon = Mastodon(
    client_id = uc_client_id,
    client_secret = uc_client_secret,
    access_token = uc_access_token,
    api_base_url = 'https://' + mastodon_hostname,
)

# Initialise access headers
headers={ 'Authorization': 'Bearer %s'%uc_access_token }

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

if __name__ == '__main__':

    lemmy_server = 'lemmy.ml'
    get_lemmy_server(lemmy_server)

    getserver(mastodon_hostname)
    self_peers = mastodon.instance_peers()

    ###########################################################################

    nprocs = multiprocessing.cpu_count()
    with multiprocessing.Pool(processes=nprocs) as pool:
        results = pool.starmap(getserver, product(self_peers))

    exec_time = str(round((time.time() - start_time), 2))
    print(exec_time)