import time
import os
from datetime import datetime, timedelta
import humanfriendly
from mastodon import Mastodon
import psycopg2

def get_uptime():
    
    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 count(server) from fediverse where alive")

        row = cur.fetchone()

        alive_servers = row[0]

        cur.execute("select MAX(last_checked_at - first_checked_at) from fediverse")

        row = cur.fetchone()

        max_uptime = row[0]

        cur.execute("select count(server) from fediverse where last_checked_at-first_checked_at=(%s)", (max_uptime,))

        row = cur.fetchone()

        if row is not None:

            best_servers = row[0]

        cur.execute("select software, count(*) as servers from fediverse where last_checked_at-first_checked_at=(%s) group by software order by servers desc", (max_uptime,))

        rows = cur.fetchall()

        software_lst = []

        servers_lst = []

        for row in rows:

            software_lst.append(row[0])

            servers_lst.append(row[1])

        cur.close()

        return (alive_servers, max_uptime, best_servers, software_lst, servers_lst)

    except (Exception, psycopg2.DatabaseError) as error:

        print(error)

    finally:

        if conn is not None:

            conn.close()

def get_percentage(uptime_servers, software):

    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 count(server) from fediverse where alive and software=(%s)", (software,))

        row = cur.fetchone()

        if row is not None:

            soft_total_servers = row[0]

        cur.close()

        soft_uptime_percent = round((uptime_servers * 100) / soft_total_servers, 1)

        return (soft_uptime_percent)

    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/uptime_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)

# 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)

# main

if __name__ == '__main__':

    mastodon, mastodon_hostname = mastodon()

    fediverse_db, fediverse_db_user = db_config()
    
    alive_servers, max_uptime, best_servers, software_lst, servers_lst = get_uptime()
    
    toot_text = '\nAlive servers: ' + str(alive_servers)
    toot_text += '\n\n'
    toot_text += f"Best #fediverse's server uptime:\n{humanfriendly.format_timespan(max_uptime)}"
    toot_text += '\n'
    toot_text += f'\nBest uptime servers:\n{str(best_servers)} ({str(round((best_servers*100)/alive_servers,2))}%)'
    toot_text += '\n\n'
    toot_text += 'Best uptime softwares & servers:\n'
    i = 0
    while i < len(software_lst):

        soft_percent = get_percentage(servers_lst[i], software_lst[i])
        toot_text += ':' + str(software_lst[i]) + ': ' + str(servers_lst[i]) + ' (' + str(soft_percent) + '%)\n'
        
        if len(toot_text) > 470:
            break
        i +=1

    print("Tooting...")
    print(toot_text)

    mastodon.status_post(toot_text, in_reply_to_id=None)