/* StationSearcher.cpp */

/* Copyright (C) 2011-2024 Michael Lugmair (Lucio Carreras)
 *
 * This file is part of sayonara player
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.

 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.

 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

#include "StationSearcher.h"
#include "FMStreamParser.h"
#include "RadioStation.h"
#include "Utils/WebAccess/WebClientImpl.h"

#include <QUrl>
#include <QList>

namespace
{
	constexpr const auto EntriesPerPage = 100;
}

struct StationSearcher::Private
{
	QString searchString;
	QList<RadioStation> foundStations;
	int currentPageIndex {0};
	int lastPageIndex {1};
	int currentServer {0};
	StationSearcher::Mode mode {StationSearcher::ByName};
};

StationSearcher::StationSearcher(QObject* parent) :
	QObject {parent},
	m {Pimpl::make<Private>()} {}

StationSearcher::~StationSearcher() = default;

void StationSearcher::startCall()
{
	const auto url = buildUrl(m->searchString, m->currentServer, m->mode, m->currentPageIndex, EntriesPerPage);

	auto* webClient = new WebClientImpl(this);
	connect(webClient, &WebClient::sigFinished, this, &StationSearcher::searchFinished);
	webClient->run(url);
}

void StationSearcher::searchStyle(const QString& style)
{
	m->searchString = style;
	m->mode = StationSearcher::ByStyle;

	startCall();
}

void StationSearcher::searchStation(const QString& name)
{
	m->mode = StationSearcher::ByName;
	m->currentPageIndex = 0;
	m->lastPageIndex = -1;
	m->searchString = name;

	startCall();
}

void StationSearcher::searchPrevious()
{
	m->currentPageIndex--;
	startCall();
}

void StationSearcher::searchNext()
{
	m->currentPageIndex++;
	startCall();
}

bool StationSearcher::canSearchNext() const
{
	return (m->foundStations.size() >= EntriesPerPage) &&
	       (m->currentPageIndex != m->lastPageIndex);
}

bool StationSearcher::canSearchPrevious() const { return (m->currentPageIndex > 0); }

StationSearcher::Mode StationSearcher::mode() const { return m->mode; }

const QList<RadioStation>& StationSearcher::foundStations() const { return m->foundStations; }

void StationSearcher::searchFinished()
{
	auto* webClient = dynamic_cast<WebClient*>(sender());

	const auto parser = createStationParser();
	auto stations = parser->parse(webClient->data());
	webClient->deleteLater();

	if(stations.isEmpty())
	{
		if(m->currentPageIndex > 0)
		{
			m->currentPageIndex--;
			m->lastPageIndex = m->currentPageIndex;
		}

		else
		{
			m->foundStations.clear();
			if(m->currentServer < serverCount() - 1)
			{
				m->currentServer++;
				startCall();
				return;
			}
		}
	}

	else
	{
		m->foundStations = std::move(stations);
	}

	emit sigStationsFound();
}

int StationSearcher::serverCount() const { return 1; }

StationParser::~StationParser() = default;

