"""Version checker"""

# Copyright 2013 Anthony Beville

# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at

#     http://www.apache.org/licenses/LICENSE-2.0

# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

import platform
import sys
import urllib.parse

import requests

from . import _version

try:
    from PyQt5.QtCore import QByteArray, QObject, QUrl, pyqtSignal
    from PyQt5.QtNetwork import QNetworkAccessManager, QNetworkReply, QNetworkRequest
except ImportError:
    # No Qt, so define a few dummy QObjects to help us compile
    class QObject:
        def __init__(self, *args):
            pass

    class pyqtSignal:
        def __init__(self, *args):
            pass

        def emit(a, b, c):
            pass


class VersionChecker(QObject):
    def getRequestUrl(self, uuid, use_stats):

        base_url = "http://comictagger1.appspot.com/latest"
        args = ""
        params = dict()
        if use_stats:
            params = {"uuid": uuid, "version": _version.version}
            if platform.system() == "Windows":
                params["platform"] = "win"
            elif platform.system() == "Linux":
                params["platform"] = "lin"
            elif platform.system() == "Darwin":
                params["platform"] = "mac"
            else:
                params["platform"] = "other"

            if not getattr(sys, "frozen", None):
                params["src"] = "T"

        return (base_url, params)

    def getLatestVersion(self, uuid, use_stats=True):
        try:
            url, params = self.getRequestUrl(uuid, use_stats)
            new_version = requests.get(url, params=params).text
        except Exception as e:
            return None

        if new_version is None or new_version == "":
            return None
        return new_version.strip()

    versionRequestComplete = pyqtSignal(str)

    def asyncGetLatestVersion(self, uuid, use_stats):
        url, params = self.getRequestUrl(uuid, use_stats)

        self.nam = QNetworkAccessManager()
        self.nam.finished.connect(self.asyncGetLatestVersionComplete)
        self.nam.get(QNetworkRequest(QUrl(str(url + "?" + urllib.parse.urlencode(params)))))

    def asyncGetLatestVersionComplete(self, reply):
        if reply.error() != QNetworkReply.NoError:
            return

        # read in the response
        new_version = str(reply.readAll())

        if new_version is None or new_version == "":
            return

        self.versionRequestComplete.emit(new_version.strip())