__author__ = "Dennis Potter"
__copyright__ = "Copyright 2019, Dennis Potter"
__credits__ = ["Dennis Potter"]
__license__ = "GPL-3.0"
__version__ = "0.5.0"
__maintainer__ = "Dennis Potter"
__email__ = "dennis@dennispotter.eu"

import os
import hjson
import time
import sqlite3
import threading
import datetime as dt
import MySQLdb as mysql

from matrix_bot_api.mregex_handler import MRegexHandler

MESSAGES_DIR = os.path.join(os.path.dirname(__file__), 'messages')
DATA_DIR = os.path.join(os.path.dirname(__file__),'../../data/events')
CONFIG_LOCATION = os.path.join(os.path.dirname(__file__), 'config.hjson')

DATA_LOCATION = DATA_DIR + '/data.db'
HELP_LOCATION = MESSAGES_DIR + '/help'
MESSAGES_LOCATION = MESSAGES_DIR + '/messages.dutch.hjson'

class Plugin:
    """ This plugin grabs events from Admidio (https://admidio.org)
    and lets users interact with the data
    """
    def __init__(self, bot):
        # Load the configuration
        with open(CONFIG_LOCATION) as hjson_data:
            self.config = hjson.load(hjson_data)

        # Load all messages for this plugin
        with open(MESSAGES_LOCATION) as hjson_data:
            self.messages = hjson.load(hjson_data)

        # Define sensitivity
        self.handler = []

        self.handler.append(MRegexHandler("Peter evenementen lijst",
            self.list_callback))
        self.handler.append(MRegexHandler("Peter evenementen info",
            self.info_callback))
        self.handler.append(MRegexHandler("Peter evenementen chat",
            self.chat_callback))
        self.handler.append(MRegexHandler("Peter evenementen deelnemers",
            self.participants_callback))

        # Save parent bot
        self.bot = bot

        # Start thread to check events
        self.event_thread = threading.Thread(target=self.check_new_event_thread)
        self.event_thread.start()

    def connect_database(self):
        # Connect to database
        return mysql.connect(
            user = self.config['database_credentials']['username'],
            password = self.config['database_credentials']['password'],
            database = self.config['database_credentials']['database'],
            host = self.config['database_credentials']['host'])


    def check_new_event_thread(self):
        while not self.bot.cancel:
            self.check_new_event()

    def check_new_event(self):
        """ Check every <X> minutes for new events in the database.

        Since the check will only be performed every <X> minutes, the
        connection to the database will not be kept open.

        As soon as an event is posted to the defined room, its ID is
        saved in an SQLite database.
        """

        mysql_db = self.connect_database()
        mysql_cursor = mysql_db.cursor()

        # Grab all events from database that start in the future
        select_sql = """SELECT dat_id, dat_cat_id,
                               dat_headline, dat_begin, dat_end
                        FROM adm_dates
                        WHERE dat_begin >'{}'""".format(
            dt.datetime.now().strftime("%Y-%m-%d %H:%M:%S"))

        mysql_cursor.execute(select_sql)

        # Fetch events
        results = mysql_cursor.fetchall()

        # Open SQLite database
        sqlite_db = sqlite3.connect(DATA_LOCATION)

        sqlite_cursor = sqlite_db.cursor()

        # Define query to SELECT event from SQLite DB
        select_sql = """SELECT dat_id
                        FROM events
                        WHERE dat_id = {}"""

        insert_sql = """INSERT INTO events(dat_id, datetime_posted)
                        VALUES(:dat_id, :datetime_posted)"""

        # Loop through event
        for row in results:
            # First, check if a message on this event was already sent
            sqlite_cursor.execute(select_sql.format(row[0]))

            if sqlite_cursor.fetchall():
                # Do nothing. This event was already processed
                pass
            else:
                # This appears to be a new event. Process it!

                # Generate links
                base_date_url = "{}{}".format(
                    self.config['base_url_adm'],
                    "/adm_program/modules/dates/")

                view_link = "{}dates.php?id={}&view_mode=html&"
                view_link += "view=detail&headline={}"
                view_link = view_link.format(base_date_url, row[0], row[2])

                function_link = "{}dates_function.php?mode={}&dat_id={}&"

                attend_link = function_link.format(base_date_url, '3', row[0])
                maybe_link = function_link.format(base_date_url, '7', row[0])
                cancel_link = function_link.format(base_date_url, '4', row[0])

                # First, write to SQLite database that it is processed
                sqlite_cursor.execute(
                    insert_sql, {
                        'dat_id':row[0],
                        'datetime_posted':
                            dt.datetime.now().strftime("%Y-%m-%d %H:%M:%S")})

                # Check role ID of event and check if config defines
                # where it should be shared.
                for mapping in self.config['cat_id_room_mapping']:
                    if row[1] in mapping[0]:
                        # We got a winner!

                        for i, room in self.bot.client.rooms.items():
                            if room.display_name in mapping[1]:
                                room.send_html(
                                    self.messages["new_event"].format(
                                        row[3].strftime("%d-%m-%Y om %H:%M"),
                                        row[2],
                                        view_link,
                                        attend_link,
                                        maybe_link,
                                        cancel_link))

        # Commit and close queries
        sqlite_db.commit()
        sqlite_db.close()

        # Close MySQL
        mysql_db.close()

        # Sleep
        time.sleep(self.config['update_time_span'] * 60)

    def list_callback(self, room, event):
        number_events = False

        for word in event['content']['body'].split():
            try:
                number_events = int(word)
                break
            except:
                pass

        if not number_events:
            number_events = 10
        elif number_events <= 0 or number_events > 100:
            room.send_text(self.messages['list_event_num_err'])
            number_events = 10

        datetime_now = dt.datetime.now().strftime("%Y-%m-%d %H:%M:%S")

        mysql_db = self.connect_database()
        mysql_cursor = mysql_db.cursor()

        select_sql = f"""SELECT dat_id, dat_cat_id,
                                dat_headline, dat_begin, dat_end
                        FROM adm_dates
                        WHERE dat_begin >'{datetime_now}'
                        ORDER BY dat_begin
                        LIMIT {number_events}"""

        mysql_cursor.execute(select_sql)

        # Fetch events
        results = mysql_cursor.fetchall()

        # Set header
        html_message = self.messages['list_events_head'].format(number_events)

        # Loop through fetched events
        html_message += "<br /><ul>"
        for row in results:
            base_date_url = "{}{}".format(
                self.config['base_url_adm'],
                "/adm_program/modules/dates/")

            function_link = "{}dates_function.php?mode={}&dat_id={}&"

            attend_link = function_link.format(base_date_url, '3', row[0])

            html_message += "<li>"
            html_message += self.messages['list_event_item'].format(
                row[3].strftime("%d-%m-%Y om %H:%M"),
                row[2],
                row[0],
                attend_link)
            html_message += "</li>"

        html_message += "</ul>"

        # Send message
        room.send_html(html_message)

        # Close DB connection
        mysql_db.close()

    def info_callback(self, room, event):
        id_event = False

        for word in event['content']['body'].split():
            try:
                id_event = int(word)
                break
            except:
                pass

        if not id_event or id_event < 0:
            room.send_html(self.messages['info_event_id_err'])
            return

        mysql_db = self.connect_database()
        mysql_cursor = mysql_db.cursor()

        select_sql = f"""SELECT dat_id, dat_headline, dat_description,
                        dat_begin, dat_end
                        FROM adm_dates
                        WHERE dat_id = {id_event}"""

        mysql_cursor.execute(select_sql)

        # Fetch events
        row = mysql_cursor.fetchall()

        date_url = "{}{}{}".format(
            self.config['base_url_adm'],
            "/adm_program/modules/dates/dates.php?id=",
            row[0][0])

        html_message = self.messages['info_event'].format(
            date_url,
            row[0][1],
            row[0][3].strftime("%d-%m-%Y om %H:%M"),
            row[0][4].strftime("%d-%m-%Y om %H:%M"),
            row[0][2])

        # Send message
        room.send_html(html_message)

        # Close DB connection
        mysql_db.close()

    def participants_callback(self, room, event):
        room.send_text("Deelnemers")

    def chat_callback(self, room, event):
        room.send_text("Chat")

    def help(self):
        return open(HELP_LOCATION, mode="r").read()

def setup():
    """This function runs only, ever. It initializes the necessary
    SQLite tables."""

    # Try to make a new directory
    os.mkdir(DATA_DIR)

    # Define query to INSERT event table to SQLite DB
    sql = """CREATE TABLE 'events' (
             'dat_id' integer,
             'datetime_posted' datetime);"""

    # Open, execute, commit, and close SQLite database
    sqlite_db = sqlite3.connect(DATA_LOCATION)
    sqlite_cursor = sqlite_db.cursor()
    sqlite_cursor.execute(sql)
    sqlite_db.commit()
    sqlite_db.close()