import configparser
from imaplib import IMAP4
import ssl
import email
import os
from glob import glob
from email.message import Message

from sqlalchemy import create_engine, text
from sqlalchemy.engine import Connection
import gpxpy
from bs4 import BeautifulSoup


config = configparser.ConfigParser()
config.read('config.ini')

db = create_engine(f"postgresql://{config['db']['username']}:{config['db']['password']}@{config['db']['host']}/{config['db']['database']}").connect()

mail = IMAP4(host=config['mail']['host'])
fitotrack_msg_filter = 'ALL'


def init_database():
    with open('init.sql') as f:
        db.execute('\n'.join(f.readlines()))


def _get_sender(msg: Message) -> str:
    sender: str = msg.get('from')
    if ' ' in sender:
        sender = sender.split(' ')
        for field in sender:
            if '@' in field and '<' in field and '>' in field:
                return field[1:-1]

    return sender


def get_gpx_files_from_mail():
    try:
        os.mkdir('gpx_files')
    except FileExistsError:
        pass
    mail.starttls(ssl.create_default_context())
    mail.login(config['mail']['username'], config['mail']['password'])

    mail.create(config['mail']['mailbox_dir'])
    mail.select()
    _, ids = mail.search(None, fitotrack_msg_filter)
    ids = ids[0].split()
    for i in ids:
        _, fetched = mail.fetch(i, '(RFC822)')
        email_message = email.message_from_bytes(fetched[0][1])
        sender = _get_sender(email_message)
        for part in email_message.walk():
            if part.get_content_maintype() == 'multipart' or part.get_content_disposition() is None:
                continue
            filename = part.get_filename()

            if filename:
                filename = f'{sender}_{filename}'
                if not os.path.exists(f'gpx_files/{filename}'):
                    with open(f'gpx_files/{filename}', 'wb') as f:
                        f.write(part.get_payload(decode=True))

        mail.store(i, '+FLAGS', '\\Deleted')
    
    mail.expunge()
    mail.close()
    mail.logout()


def process_gpx_files(tx: Connection):
    for filepath in glob('gpx_files/*.gpx'):
        owner = os.path.split(filepath)[-1].split('_workout-')[0]
        filename = f'workout-{os.path.split(filepath)[-1].split("_workout-")[1]}'
        if list(db.execute(text('select exists(select from training where owner = :owner and filename = :filename)'),
                dict(owner=owner, filename=filename,),),)[0][0]:
            continue
        with open(filepath) as f:
            gpx_file = gpxpy.parse(f)
            if gpx_file.creator != 'FitoTrack':
                raise ValueError('gpx file not generated by the FitoTrack app')
            training_id = list(db.execute(
                text("""
                    insert into training(owner, filename, type, description, moving_time, stopped_time, moving_distance, stopped_distance) values 
                    (:owner, :filename, :type, :description, :moving_time, :stopped_time, :moving_distance, :stopped_distance) returning id
                """),
                dict(owner=owner,
                filename=filename,
                type='cycling', # TODO other training types
                description=gpx_file.description,
                moving_time=gpx_file.get_moving_data().moving_time,
                stopped_time=gpx_file.get_moving_data().stopped_time,
                moving_distance=gpx_file.get_moving_data().moving_distance,
                stopped_distance=gpx_file.get_moving_data().stopped_distance,),
            ))[0][0]
            for track in gpx_file.tracks:
                for segment in track.segments:
                    for point in segment.points:
                        db.execute(text("""
                            insert into training_data(training_id, t, geog, speed, elevation)
                                values (:training_id, :t, :geog, :speed, :elevation)
                            """),
                            dict(training_id=training_id,
                            t=point.time,
                            geog=f'POINT({point.latitude} {point.longitude})',
                            speed=point.speed,
                            elevation=point.elevation,),)


def main():
    init_database()
    get_gpx_files_from_mail()
    db.transaction(process_gpx_files)


if __name__ == '__main__':
    try:
        main()
    except (KeyboardInterrupt, EOFError):
        pass