import sys
import os
import time
from datetime import datetime
import urllib3
import requests
import socket
from mastodon import Mastodon
import psycopg2
import matplotlib.pyplot as plt
import ray

ray.init(num_cpus = 32) # Specify this system CPUs.

class Server:

    name = 'Server'

    def __init_(self, server, software, users, alive, api, soft_version, now):

        self.server = server
        self.software = software
        self.users = users
        self.alive = alive
        self.api = api
        self.version = self.soft_version
        self.now = now

    @ray.remote
    def get_alive_servers(server):

        users = 0

        downs = 0

        fediverse_db, fediverse_db_user = db_config()

        try:

            conn = None

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

            cur = conn.cursor()

            cur.execute("select alive, software, users_api, version, first_checked_at, downs from fediverse where server=(%s)", (server,))

            row = cur.fetchone()

            if row is not None:

                was_alive = row[0]
                software = row[1]
                api = row[2]
                soft_version = row[3]
                first_checked_at = row[4]
                downs_qty = row[5]

            cur.close()

        except (Exception, psycopg2.DatabaseError) as error:

            print(error)

        finally:

            if conn is not None:

                conn.close()

            alive = False

            try:

                user_agent = {'User-agent': 'Mozilla/5.0'}

                data = requests.get('https://' + server + api, headers = user_agent, timeout=3)

                try:

                    users = data.json()['usage']['users']['total']

                    if users == 0:

                        users = data.json()['usage']['users']['activeHalfyear']

                    if software == 'socialhome':

                        soft_version = data.json()['server']['version']

                    else:

                        soft_version = data.json()['software']['version']

                    if software == "wordpress" and "activitypub" in data.json()['protocols']:

                        alive = True

                    elif software == "wordpress" and "activitypub" not in data.json()['protocols']:

                        alive = False

                    else:

                        alive = True

                except:

                    soft_version = ""

                else: 

                    if api == '/api/v1/instance?':

                        try:
                            users = data.json()['stats']['user_count']
                            soft_version = data.json()['version']
                            alive = True
                        except:
                            soft_version = ""

                if alive:

                    if downs_qty != None:

                        downs = downs_qty

                    if soft_version != "" and soft_version is not None:

                        print(f'\n** Server {server} ({software} {soft_version}) is alive! **')

                    else:

                        print(f'\n** Server {server} ({software}) is alive! **')

            except urllib3.exceptions.ProtocolError as protoerr:

                print_dead(server)
                pass

            except requests.exceptions.ChunkedEncodingError as chunkerr:

                print_dead(server)
                pass

            except KeyError as e:

                print_dead(server)
                pass

            except ValueError as verr:

                print_dead(server)
                pass

            except requests.exceptions.SSLError as errssl:

                print_dead(server)
                pass

            except requests.exceptions.HTTPError as errh:

                print_dead(server)
                pass

            except requests.exceptions.ConnectionError as errc:

                print_dead(server)
                pass

            except requests.exceptions.Timeout as errt:

                print_dead(server)
                pass

            except requests.exceptions.RequestException as err:

                print_dead(server)
                pass

            except socket.gaierror as gai_error:

                print_dead(server)
                pass

            if not alive:

                if downs_qty != None:

                    downs = downs_qty + 1

                else:

                    downs = 1

        return (server, software, soft_version, alive, api, users, downs, first_checked_at)

def write_alive_server(server, software, soft_version, alive, api, users, downs, first_checked_at):

    insert_sql = "INSERT INTO fediverse(server, users, updated_at, software, alive, users_api, version, first_checked_at, last_checked_at, downs) VALUES(%s,%s,%s,%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, users, now, software, alive, api, soft_version, now, now, downs))

        if first_checked_at != None:

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

        else:

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

def write_not_alive_server(server, software, soft_version, alive, api, users, downs, first_checked_at):

    conn = None

    try:

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

        cur = conn.cursor()

        if first_checked_at != None:

            cur.execute("UPDATE fediverse SET updated_at=(%s), alive=(%s), downs=(%s) where server=(%s)", (now, alive, downs, server))

        else:

            cur.execute("UPDATE fediverse SET updated_at=(%s), alive=(%s), first_checked_at=(%s), downs=(%s) where server=(%s)", (now, alive, now, downs, 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()

def delete_dead_servers():

    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("select server from fediverse where downs > '14' and not alive and now() - first_checked_at > interval '7 days'")

        rows = cur.fetchall()

        for row in rows:

            print(f'Deleting server {row[0]}...')

            cur.execute("delete from fediverse where server=(%s)", (row[0],))

        conn.commit()

        cur.close()

    except (Exception, psycopg2.DatabaseError) as error:

        print(error)

    finally:

        if conn is not None:

            conn.close()

def get_last_checked_servers():

    ############################################################################
    # get last checked servers from fediverse DB

    alive_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 server in (select server from fediverse where users_api != '')")

        alive_servers = []

        for row in cur:

            alive_servers.append(row[0])

        cur.close()

    except (Exception, psycopg2.DatabaseError) as error:

        print(error)

    finally:

        if conn is not None:

            conn.close()

    return alive_servers

def print_dead(server):

    print(f'\nServer {server} is dead :-(')

def set_world_servers_check_to_false():

    ############################################################################
    # set all world servers's checked column to False

    try:

        conn = None

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

        cur = conn.cursor()

        cur.execute("UPDATE world SET checked='f'")

        conn.commit()

        cur.close()

    except (Exception, psycopg2.DatabaseError) as error:

        print(error)

    finally:

        if conn is not None:

            conn.close()

def set_world_servers_check_to_false():

    ############################################################################
    # set all world servers's checked column to False

    try:

        conn = None

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

        cur = conn.cursor()

        cur.execute("UPDATE world SET checked='f'")

        conn.commit()

        cur.close()

    except (Exception, psycopg2.DatabaseError) as error:

        print(error)

    finally:

        if conn is not None:

            conn.close()

def mastodon():

    # 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)

    # 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}

    return (mastodon, mastodon_hostname)

def db_config():

    # Load db configuration from config file
    config_filepath = "config/db_config.txt"
    fediverse_db = get_parameter("fediverse_db", config_filepath)
    fediverse_db_user = get_parameter("fediverse_db_user", config_filepath)

    return (fediverse_db, fediverse_db_user)

def usage():

    print('usage: python ' + sys.argv[0] + ' --multi' + ' (multiprocessing, fast)')
    print('usage: python ' + sys.argv[0] + ' --mono' + ' (one process, slow)')

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)

if __name__ == '__main__':

    # usage modes

    if len(sys.argv) == 1:

        usage()

    elif len(sys.argv) == 2:

        if sys.argv[1] == '--multi':

            now = datetime.now()

            mastodon, mastodon_hostname = mastodon()

            fediverse_db, fediverse_db_user = db_config()

            total_servers = 0

            total_users = 0

            set_world_servers_check_to_false()

            alive_servers = get_last_checked_servers()

            getservers = Server()

            getservers.now = datetime.now()

            start = time.time()

            results = ray.get([getservers.get_alive_servers.remote(server) for server in alive_servers])

            print(f"duration = {time.time() - start}.\nprocessed servers: {len(results)}")

            all_servers = len(results)

            server_num = 1

            for server in results:

                servername = server[0]
                software = server[1]
                soft_version = server[2]
                alive = server[3]
                api = server[4]
                users = server[5]
                downs = server[6]
                first_checked_at = server[7]

                if alive:

                    print(f'** Saving server {server_num} of {all_servers}: {servername}, alive')

                    write_alive_server(servername, software, soft_version, alive, api, users, downs, first_checked_at)

                else:

                    print(f'-- Saving server {server_num} of {all_servers}: {servername}, not alive')

                    first_checked_at = now if first_checked_at == None else first_checked_at

                    write_not_alive_server(servername, software, soft_version, alive, api, users, downs, first_checked_at)

                server_num += 1

            ###########################################################################
            # get current total servers and users, get users from every software

            now = datetime.now()

            gettotals_sql = "select count(server), sum(users) from fediverse where alive"
            get_soft_totals_sql = "select software, sum(users) as users, count(server) as servers from fediverse where users != 0 and alive group by software order by users desc"
            soft_total_project = []
            soft_total_users = []
            soft_total_servers = []

            try:

                conn = None

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

                cur = conn.cursor()

                cur.execute(gettotals_sql)

                row = cur.fetchone()

                total_servers = row[0]

                total_users = row[1]

                cur.execute(get_soft_totals_sql)

                rows = cur.fetchall()

                for row in rows:

                    soft_total_project.append(row[0])
                    soft_total_users.append(row[1])
                    soft_total_servers.append(row[2])

                cur.close()

            except (Exception, psycopg2.DatabaseError) as error:

                print(error)

            finally:

                if conn is not None:

                    conn.close()

            ###########################################################################
            #  get last check values and write current total ones

            select_sql = "select total_servers, total_users from totals order by datetime desc limit 1"

            insert_sql = "INSERT INTO totals(datetime, total_servers, total_users) VALUES(%s,%s,%s)"

            try:

                conn = None

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

                cur = conn.cursor()

                cur.execute(select_sql)

                row = cur.fetchone()

                if row is not None:

                    servers_before = row[0]

                    users_before = row[1]

                else:

                    servers_before = 0

                    users_before = 0

                cur.execute(insert_sql, (now, total_servers, total_users))

                conn.commit()

                cur.close()

                evo_servers = total_servers - servers_before

                evo_users = total_users - users_before

            except (Exception, psycopg2.DatabaseError) as error:

                print(error)

            finally:

                if conn is not None:

                    conn.close()

            ################################################################################
            #  write evo values

            insert_sql = "INSERT INTO evo(datetime, servers, users) VALUES(%s,%s,%s)"

            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, (now, evo_servers, evo_users))

                conn.commit()

                cur.close()

            except (Exception, psycopg2.DatabaseError) as error:

                print(error)

            finally:

                if conn is not None:

                    conn.close()

            ##############################################################################
            # get world's last update datetime

            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("select updated_at from world order by updated_at desc limit 1")

                row = cur.fetchone()

                last_update = row[0]

                last_update = last_update.strftime('%m/%d/%Y, %H:%M:%S')

                cur.close()

            except (Exception, psycopg2.DatabaseError) as error:

                print(error)

            finally:

                if conn is not None:

                    conn.close()

            ##############################################################################
            # get max servers and users

            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("select MAX(total_servers) from totals")

                row = cur.fetchone()

                if row is not None:

                    max_servers = row[0]

                else:

                    max_servers = 0

                cur.execute("select MAX(total_users) from totals")

                row = cur.fetchone()

                if row is not None:

                    max_users = row[0]

                else:

                    max_users = 0

                cur.close()

            except (Exception, psycopg2.DatabaseError) as error:

                print(error)

            finally:

                if conn is not None:

                    conn.close()

            ###############################################################################
            # get plots

            servers_plots = []

            users_plots = []

            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("select total_servers, total_users from totals order by datetime desc limit 14")

                rows = cur.fetchall()

                for row in rows:

                    servers_plots.append(row[0])

                    users_plots.append(row[1])

                cur.close()

            except (Exception, psycopg2.DatabaseError) as error:

                print(error)

            finally:

                if conn is not None:

                    conn.close()

            ###############################################################################
            # generate graphs

            plt.plot([-6, -5, -4, -3, -2, -1, 0], [servers_plots[6], servers_plots[5], servers_plots[4], servers_plots[3], servers_plots[2], servers_plots[1], servers_plots[0]], marker='o', color='mediumseagreen')

            plt.plot([-6, -5, -4, -3, -2, -1, 0], [max_servers, max_servers, max_servers, max_servers, max_servers, max_servers, max_servers], color='red')

            plt.title('fediverse: total alive servers (max: ' + str(f"{max_servers:,}" + ')'), loc='right', color='blue')

            plt.xlabel('Last seven days')

            plt.ylabel('fediverse alive servers')

            plt.legend(('servers', 'max'), shadow=True, loc=(0.01, 1.00), handlelength=1.5, fontsize=10)

            plt.savefig('servers.png')

            plt.close()

            plt.plot([-6, -5, -4, -3, -2, -1, 0], [users_plots[6], users_plots[5], users_plots[4], users_plots[3], users_plots[2], users_plots[1], users_plots[0]], marker='o', color='royalblue')

            plt.plot([-6, -5, -4, -3, -2, -1, 0], [max_users, max_users, max_users, max_users, max_users, max_users, max_users], color='red')

            plt.title('fediverse: total registered users (max: ' + str(f"{max_users:,}" + ')'), loc='right', color='royalblue')

            plt.legend(('users', 'max'), shadow=True, loc=(0.01, 0.80), handlelength=1.5, fontsize=10)

            plt.xlabel('Last seven days')

            plt.ylabel('Registered users')

            plt.savefig('users.png')

            plt.close()

            ###############################################################################
            # T  O  O  T !

            toot_text = "#fediverse alive servers stats" + " \n"

            toot_text += "\n"

            if evo_servers >= 0:

                toot_text += "alive servers: " + str(f"{total_servers:,}") + " (+"+ str(f"{evo_servers:,}") + ") \n"

                toot_text += "max: " + str(f"{max_servers:,}") + "\n"

            elif evo_servers < 0:

                toot_text += "alive servers: " + str(f"{total_servers:,}") + " ("+ str(f"{evo_servers:,}") + ") \n"

                toot_text += "max: " + str(f"{max_servers:,}") + "\n"

            if evo_users >= 0:

                toot_text += "total users: " + str(f"{total_users:,}") + " (+"+ str(f"{evo_users:,}") + ") \n"

                toot_text += "max: " + str(f"{max_users:,}") + "\n"

            elif evo_users < 0:

                toot_text += "total users: " + str(f"{total_users:,}") + " ("+ str(f"{evo_users:,}") + ") \n"

                toot_text += "max: " + str(f"{max_users:,}") + "\n"

            toot_text += "\ntop ten (soft users servers):\n\n"

            i = 0

            while i < 10:

                project_soft = soft_total_project[i]

                project_users = soft_total_users[i]

                project_servers = soft_total_servers[i]

                len_pr_soft = len(project_soft)

                toot_text += f":{project_soft}: {project_users:,} {project_servers:,}\n"

                i += 1

            print("Tooting...")

            print(toot_text)

            servers_image_id = mastodon.media_post('servers.png', "image/png", description='servers graph').id

            users_image_id = mastodon.media_post('users.png', "image/png", description='users graph').id

            mastodon.status_post(toot_text, in_reply_to_id=None, media_ids={servers_image_id, users_image_id})

            delete_dead_servers()

    else:

        usage()