# -*- coding: utf-8 -*-
# This file is part of beets.
# Copyright 2016, Adrian Sampson.
#
# Permission is hereby granted, free of charge, to any person obtaining
# a copy of this software and associated documentation files (the
# "Software"), to deal in the Software without restriction, including
# without limitation the rights to use, copy, modify, merge, publish,
# distribute, sublicense, and/or sell copies of the Software, and to
# permit persons to whom the Software is furnished to do so, subject to
# the following conditions:
#
# The above copyright notice and this permission notice shall be
# included in all copies or substantial portions of the Software.

"""Updates Subsonic library on Beets import
Your Beets configuration file should contain
a "subsonic" section like the following:
    subsonic:
        host: 192.168.x.y (Subsonic server IP)
        port: 4040 (default)
        user: <your username>
        pass: <your password>
        contextpath: /subsonic
"""
from __future__ import division, absolute_import, print_function

import hashlib
import random
import string

import requests

from beets import config
from beets.plugins import BeetsPlugin

__author__ = 'https://github.com/maffo999'


def build_payload():
    """ To avoid sending plaintext passwords, authentication will be
    performed via username, a token, and a 6 random
    letters/numbers sequence.
    The token is the concatenation of your password and the 6 random
    letters/numbers (the salt) which is hashed with MD5.
    """

    user = config['subsonic']['user'].as_str()
    password = config['subsonic']['pass'].as_str()

    # Pick the random sequence and salt the password
    r = string.ascii_letters + string.digits
    salt = "".join([random.choice(r) for n in range(6)])
    t = password + salt
    token = hashlib.md5()
    token.update(t.encode('utf-8'))

    # Put together the payload of the request to the server and the URL
    return {
        'u': user,
        't': token.hexdigest(),
        's': salt,
        'v': '1.15.0',  # Subsonic 6.1 and newer.
        'c': 'beets'
    }


def formal_url():
    """ Formats URL to send request to Subsonic
    DEPRECATED schema, host, port, contextpath; use ${url}
    """

    host = config['subsonic']['host'].as_str()
    port = config['subsonic']['port'].get(int)

    context_path = config['subsonic']['contextpath'].as_str()
    if context_path == '/':
        context_path = ''

    url = config['subsonic']['url'].as_str()
    if url and url.endsWith('/'):
        url = url[:-1]

    if not url:
        url = "http://{}:{}{}".format(host, port, context_path)

    return url + '/rest/startScan'


class SubsonicUpdate(BeetsPlugin):
    def __init__(self):
        super(SubsonicUpdate, self).__init__()

        # Set default configuration values
        config['subsonic'].add({
            'host': 'localhost',
            'port': '4040',
            'user': 'admin',
            'pass': 'admin',
            'contextpath': '/',
            'url': 'http://localhost:4040'
        })

        config['subsonic']['pass'].redact = True
        self.register_listener('import', self.start_scan)

    def start_scan(self):
        url = formal_url()
        payload = build_payload()

        response = requests.post(url, params=payload)

        if response.status_code == 403:
            self._log.error(u'Server authentication failed')
        elif response.status_code == 200:
            self._log.debug(u'Updating Subsonic')
        else:
            self._log.error(
                u'Generic error, please try again later [Status Code: {}]'
                    .format(response.status_code))