// Copyright (C) 2023 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause

#include "cgooglefonts.h"
#include <QString>

#include <QNetworkAccessManager>
#include <QNetworkRequest>
#include <QNetworkReply>
#include <QEventLoop>

#include <QUrl>
#include <QUrlQuery>

#include <QJsonDocument>
#include <QJsonArray>


QStringList arrayToString(const QJsonArray& array) {
	QStringList list;

	foreach (const QJsonValue& item, array) {
		list.append(item.toString());
	}

	return list;
}

QMap<QString, QString> objectToMap(const QJsonObject& object) {
	QMap<QString, QString>	list;

	for (const QString &key : object.keys()) {
		QJsonValue value = object.value(key);
		list.insert(key, value.toString());
	}

	return list;
}

cGoogleFonts::cGoogleFonts() {
	m_key	= tr("AIzaSyCqPgQFvG-k4lbPF7L0oqJLKJxoC1O6R90");
}

cGoogleFonts::~cGoogleFonts() {
}

QString	cGoogleFonts::pluginAPIVersion() {
	return tr("1.0");
}

QString	cGoogleFonts::name() {
	return tr("Google Fonts");
}

QString cGoogleFonts::version() {
	return tr("0.1");
}

QList<cFontInfo> cGoogleFonts::search(const QString& family, const QString& subset, const Sort& sort) {
	QNetworkAccessManager	networkManager;
	QString					urlString	= "https://www.googleapis.com/webfonts/v1/webfonts";
	QUrlQuery				query;

	query.addQueryItem("key", m_key);

	if(!family.isEmpty())
		query.addQueryItem("family", family);

	if(!subset.isEmpty())
		query.addQueryItem("subset", subset);

	switch(sort)
	{
	case Sort::alpha:
		query.addQueryItem("sort", "alpha");
		break;
	case Sort::date:
		query.addQueryItem("sort", "date");
		break;
	case Sort::popularity:
		query.addQueryItem("sort", "popularity");
		break;
	case Sort::style:
		query.addQueryItem("sort", "style");
		break;
	default:
		query.addQueryItem("sort", "alpha");
		break;
	}

	QUrl					url(urlString);
	url.setQuery(query);

	QNetworkRequest			request(url);

	request.setHeader(QNetworkRequest::ContentTypeHeader, "application/x-www-form-urlencoded");

	QNetworkReply*			reply	= networkManager.get(request);
	QEventLoop				loop;

	QObject::connect(reply, &QNetworkReply::finished, &loop, &QEventLoop::quit);
	loop.exec();

	QByteArray				data	= reply->readAll();
	delete reply;

	QJsonDocument			doc		= QJsonDocument::fromJson(data);
	if(doc.isNull()) {
		qDebug() << "Error: JSON return is empty";
		return QList<cFontInfo>();
	}

	if(!doc.isObject()) {
		qDebug() << "Error: invalid JSON";
		return QList<cFontInfo>();
	}

	QJsonObject				root	= doc.object();

	if(!root.contains("items")) {
		qDebug() << "Error: no fonts found";
		return QList<cFontInfo>();
	}

	QJsonValue				itemsV	= root.value("items");
	if(!itemsV.isArray()) {
		qDebug() << "Error: no fonts found";
		return QList<cFontInfo>();
	}

	QJsonArray				items	= itemsV.toArray();

	if(!items.count())
		return QList<cFontInfo>();

	QList<cFontInfo>			fontList;

	foreach (const QJsonValue& item, items) {
		if (item.isObject()) {
			cFontInfo		font;
			QJsonObject		obj	= item.toObject();

			if(obj.contains("family"))
				font.setFamily(obj.value("family").toString());
			else
				continue;

			if(obj.contains("variants"))
				font.setVariants(arrayToString(obj.value("variants").toArray()));

			if(obj.contains("subsets"))
				font.setSubsets(arrayToString(obj.value("subsets").toArray()));

			if(obj.contains("version"))
				font.setVersion(obj.value("version").toString());

			if(obj.contains("lastModified"))
				font.setLastModified(QDate::fromString(obj.value("lastModified").toString()));

			if(obj.contains("files")) {
				QJsonObject	filesObj	= obj.value("files").toObject();

				font.setFiles(objectToMap(filesObj));
			}

			if(obj.contains("category"))
				font.setCategory(obj.value("category").toString());

			if(obj.contains("kind"))
				font.setKind(obj.value("kind").toString());

			fontList.append(font);
		}
	}

	return fontList;
}