openweathermapbackend.cpp

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// Copyright (C) 2021 The Qt Company Ltd.

// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause

#include "openweathermapbackend.h"

#include <QtCore/qjsonarray.h>

#include <QtCore/qjsondocument.h>

#include <QtCore/qjsonobject.h>

#include <QtCore/qjsonvalue.h>

#include <QtCore/qloggingcategory.h>

#include <QtCore/qurlquery.h>

#include <QtNetwork/qnetworkaccessmanager.h>

#include <QtNetwork/qnetworkreply.h>

#include <QtPositioning/qgeocoordinate.h>

Q_DECLARE_LOGGING_CATEGORY(requestsLog)

static constexpr auto kZeroKelvin = 273.15;

static QString niceTemperatureString(double t)

    return QString::number(qRound(t - kZeroKelvin)) + QChar(0xB0);

/*

    Converts weather code to a string that will be used to show the icon.

    The possible strings are based on the icon names. The icon name is built up

    as follows:

        weather-[mystring].png

    where [mystring] is the value returned by this method.

    Check resources for the full list of available icons.

*/

static QString weatherCodeToString(const QString &code)

    if (code == u"01d" || code == u"01n")

        return "sunny";

    else if (code == u"02d" || code == u"02n")

        return "sunny-very-few-clouds";

    else if (code == u"03d" || code == u"03n")

        return "few-clouds";

    else if (code == u"04d" || code == u"04n")

        return "overcast";

    else if (code == u"09d" || code == u"09n" || code == u"10d" || code == u"10n")

        return "showers";

    else if (code == u"11d" || code == u"11n")

        return "thundershower";

    else if (code == u"13d" || code == u"13n")

        return "snow";

    else if (code == u"50d" || code == u"50n")

        return "fog";

    return "sunny"; // default choice

static void parseWeatherDescription(const QJsonObject &object, WeatherInfo &info)

    const QJsonArray weatherArray = object.value(u"weather").toArray();

    if (!weatherArray.isEmpty()) {

        const QJsonObject obj = weatherArray.first().toObject();

        info.m_weatherDescription = obj.value(u"description").toString();

        info.m_weatherIconId = weatherCodeToString(obj.value(u"icon").toString());

    } else {

        qCDebug(requestsLog, "An empty weather array is returned.");

OpenWeatherMapBackend::OpenWeatherMapBackend(QObject *parent)

    : ProviderBackend(parent),

      m_networkManager(new QNetworkAccessManager(this)),

      m_appId(QStringLiteral("36496bad1955bf3365448965a42b9eac"))

void OpenWeatherMapBackend::requestWeatherInfo(const QString &city)

    QUrlQuery query;

    query.addQueryItem(QStringLiteral("q"), city);

    requestCurrentWeather(query, QGeoCoordinate());

void OpenWeatherMapBackend::requestWeatherInfo(const QGeoCoordinate &coordinate)

    QUrlQuery query;

    query.addQueryItem(QStringLiteral("lat"), QString::number(coordinate.latitude()));

    query.addQueryItem(QStringLiteral("lon"), QString::number(coordinate.longitude()));

    requestCurrentWeather(query, coordinate);

void OpenWeatherMapBackend::handleCurrentWeatherReply(QNetworkReply *reply,

                                                      const QGeoCoordinate &coordinate)

    if (!reply) {

        emit errorOccurred();

        return;

    bool parsed = false;

    if (!reply->error()) {

        // extract info about current weather

        const QJsonDocument document = QJsonDocument::fromJson(reply->readAll());

        const QJsonObject documentObject = document.object();

        LocationInfo currentLocation;

        currentLocation.m_name = documentObject.value(u"name").toString();

        if (coordinate.isValid())

            currentLocation.m_coordinate = coordinate;

        qCDebug(requestsLog) << "Got current weather for" << currentLocation.m_name;

        WeatherInfo currentWeather;

        parseWeatherDescription(documentObject, currentWeather);

        const QJsonObject mainObject = documentObject.value(u"main").toObject();

        const QJsonValue tempValue = mainObject.value(u"temp");

        if (tempValue.isDouble())

            currentWeather.m_temperature = niceTemperatureString(tempValue.toDouble());

        else

            qCDebug(requestsLog, "Failed to parse current temperature.");

        parsed = !currentLocation.m_name.isEmpty() && !currentWeather.m_temperature.isEmpty();

        if (parsed) {

            // request forecast

            requestWeatherForecast(currentLocation, currentWeather);

    if (!parsed) {

        emit errorOccurred();

        if (reply->error())

            qCDebug(requestsLog) << reply->errorString();

        else

            qCDebug(requestsLog, "Failed to parse current weather JSON.");

    reply->deleteLater();

void OpenWeatherMapBackend::handleWeatherForecastReply(QNetworkReply *reply,

                                                       const LocationInfo &location,

                                                       const WeatherInfo &currentWeather)

    if (!reply) {

        emit errorOccurred();

        return;

    if (!reply->error()) {

        QJsonDocument document = QJsonDocument::fromJson(reply->readAll());

        const QJsonObject documentObject = document.object();

        QList<WeatherInfo> weatherDetails;

        // current weather will be the first in the list

        weatherDetails << currentWeather;

        QJsonArray daysList = documentObject.value(u"list").toArray();

        // include current day as well

        for (qsizetype i = 0; i < daysList.size(); ++i) {

            QJsonObject dayObject = daysList.at(i).toObject();

            WeatherInfo info;

            const QDateTime dt = QDateTime::fromSecsSinceEpoch(dayObject.value(u"dt").toInteger());

            info.m_dayOfWeek = dt.toString(u"ddd");

            const QJsonObject tempObject = dayObject.value(u"temp").toObject();

            const QJsonValue minTemp = tempObject.value(u"min");

            const QJsonValue maxTemp = tempObject.value(u"max");

            if (minTemp.isDouble() && maxTemp.isDouble()) {

                info.m_temperature = niceTemperatureString(minTemp.toDouble()) + QChar('/')

                        + niceTemperatureString(maxTemp.toDouble());

            } else {

                qCDebug(requestsLog, "Failed to parse min or max temperature.");

            parseWeatherDescription(dayObject, info);

            if (!info.m_temperature.isEmpty() && !info.m_weatherIconId.isEmpty())

                weatherDetails.push_back(info);

        emit weatherInformation(location, weatherDetails);

    } else {

        emit errorOccurred();

        qCDebug(requestsLog) << reply->errorString();

    reply->deleteLater();

void OpenWeatherMapBackend::requestCurrentWeather(QUrlQuery &query,

                                                  const QGeoCoordinate &coordinate)

    QUrl url("http://api.openweathermap.org/data/2.5/weather");

    query.addQueryItem(QStringLiteral("mode"), QStringLiteral("json"));

    query.addQueryItem(QStringLiteral("APPID"), m_appId);

    url.setQuery(query);

    QNetworkReply *reply = m_networkManager->get(QNetworkRequest(url));

    connect(reply, &QNetworkReply::finished, this,

            [this, reply, coordinate]() { handleCurrentWeatherReply(reply, coordinate); });

void OpenWeatherMapBackend::requestWeatherForecast(const LocationInfo &location,

                                                   const WeatherInfo &currentWeather)

    QUrl url("http://api.openweathermap.org/data/2.5/forecast/daily");

    QUrlQuery query;

    query.addQueryItem(QStringLiteral("q"), location.m_name);

    query.addQueryItem(QStringLiteral("mode"), QStringLiteral("json"));

    query.addQueryItem(QStringLiteral("cnt"), QStringLiteral("4"));

    query.addQueryItem(QStringLiteral("APPID"), m_appId);

    url.setQuery(query);

    QNetworkReply *reply = m_networkManager->get(QNetworkRequest(url));

    connect(reply, &QNetworkReply::finished, this, [this, reply, location, currentWeather]() {

        handleWeatherForecastReply(reply, location, currentWeather);

});