from PyQt5.QtNetwork import QNetworkAccessManager, QNetworkRequest
from PyQt5.QtCore import QUrl, QEventLoop
from urllib.parse import urlencode


class SyncRequester:
    def __init__(self, networkManager=None):
        self.networkManager = networkManager or QNetworkAccessManager()

    def get(self, url, params=None, headers={}):
        url = QUrl(url)
        if params:
            qs = url.query() + ('&' if url.query() else '') + urlencode(params)
            url.setQuery(qs)
        request = self._getRequest(url, headers)
        reply = self.networkManager.get(request)
        self._waitReply(reply)
        return reply

    def head(self, url, headers={}):
        u = QUrl(url)
        request = self._getRequest(u, headers)
        reply = self.networkManager.head(request)
        self._waitReply(reply)
        return reply

    def post(self, url, data, headers={}):
        url = QUrl(url)
        if isinstance(data, (dict, list, tuple)):
            data = urlencode(data).encode('ascii')
        request = self._getRequest(url, headers)
        reply = self.networkManager.post(request, data)
        self._waitReply(reply)
        return reply

    def put(self, url, data, headers={}):
        url = QUrl(url)
        request = self._getRequest(url, headers)
        reply = self.networkManager.put(request, data)
        self._waitReply(reply)
        return reply

    def _getRequest(self, url, headers):
        request = QNetworkRequest(url)
        for header, value in headers.items():
            request.setRawHeader(bytes(header, 'ascii'), bytes(value, 'ascii'))
        return request

    def _waitReply(self, reply):
        loop = QEventLoop()
        reply.finished.connect(loop.quit)
        loop.exec_()


if __name__ == '__main__':
    from PyQt5.QtWidgets import (QApplication, QWidget, QVBoxLayout, QLabel,
                                 QTextEdit)
    app = QApplication([])
    requester = SyncRequester()
    r = requester.get("http://httpbin.org/get", {"foo": "bar"})
    w = QWidget()
    lay = QVBoxLayout(w)
    lay.addWidget(QLabel("Response:"))
    lay.addWidget(QTextEdit("<pre>{}</pre>".format(str(r.readAll(), 'utf-8'))))
    w.show()
    app.exec_()
    del app # QWaitCondition: Destroyed while threads are still waiting?!