#include "../src/MapWidget.h"

#include <QApplication>
#include <QElapsedTimer>
#include <QHostAddress>
#include <QSet>
#include <QTcpServer>
#include <QTcpSocket>
#include <QThread>

#include <cassert>

int main(int argc, char **argv)
{
    QApplication app(argc, argv);

    QTcpServer tileServer;
    assert(tileServer.listen(QHostAddress::LocalHost, 0));

    int requestCount = 0;
    QSet<QByteArray> requestedPaths;
    QObject::connect(&tileServer, &QTcpServer::newConnection, [&]() {
        while (tileServer.hasPendingConnections()) {
            QTcpSocket *socket = tileServer.nextPendingConnection();
            const auto respond = [&, socket]() {
                if (!socket->canReadLine()) {
                    return;
                }
                const QByteArray requestLine = socket->readLine().trimmed();
                const QList<QByteArray> fields = requestLine.split(' ');
                if (fields.size() >= 2) {
                    ++requestCount;
                    requestedPaths.insert(fields[1]);
                }
                socket->readAll();
                socket->write("HTTP/1.1 503 Service Unavailable\r\n"
                              "Content-Length: 0\r\n"
                              "Connection: close\r\n\r\n");
                socket->disconnectFromHost();
            };
            QObject::connect(socket, &QTcpSocket::readyRead, socket, respond);
            QObject::connect(socket, &QTcpSocket::disconnected,
                             socket, &QObject::deleteLater);
            respond();
        }
    });

    const QByteArray tileUrl = QByteArray("http://127.0.0.1:")
        + QByteArray::number(tileServer.serverPort()) + "/{z}/{x}/{y}.png";
    qputenv("LOCATION_PLOTTER_TILE_URL_TEMPLATE", tileUrl);

    {
        MapWidget map;
        map.resize(640, 480);
        map.show();

        QElapsedTimer timer;
        timer.start();
        while (timer.elapsed() < 1200) {
            app.processEvents(QEventLoop::AllEvents, 50);
            QThread::msleep(5);
        }

        // Every URL fails. Seeing any URL more than once proves that a failed
        // tile schedules a new paint/request instead of remaining a blank
        // placeholder forever.
        assert(!requestedPaths.isEmpty());
        assert(requestCount > requestedPaths.size());
    }

    qunsetenv("LOCATION_PLOTTER_TILE_URL_TEMPLATE");
    return 0;
}