/* Copyright 2013-2017 MultiMC Contributors
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#include <QtNetwork>
#include <QtXml>
#include <QRegExp>

#include <QDebug>

#include "java/JavaInstallList.h"
#include "java/JavaCheckerJob.h"
#include "java/JavaUtils.h"
#include "MMCStrings.h"
#include "minecraft/VersionFilterData.h"

JavaInstallList::JavaInstallList(QObject *parent) : BaseVersionList(parent)
{
}

shared_qobject_ptr<Task> JavaInstallList::getLoadTask()
{
	load();
	return getCurrentTask();
}

shared_qobject_ptr<Task> JavaInstallList::getCurrentTask()
{
	if(m_status == Status::InProgress)
	{
		return m_loadTask;
	}
	return nullptr;
}

void JavaInstallList::load()
{
	if(m_status != Status::InProgress)
	{
		m_status = Status::InProgress;
		m_loadTask = new JavaListLoadTask(this);
		m_loadTask->start();
	}
}

const BaseVersionPtr JavaInstallList::at(int i) const
{
	return m_vlist.at(i);
}

bool JavaInstallList::isLoaded()
{
	return m_status == JavaInstallList::Status::Done;
}

int JavaInstallList::count() const
{
	return m_vlist.count();
}

QVariant JavaInstallList::data(const QModelIndex &index, int role) const
{
	if (!index.isValid())
		return QVariant();

	if (index.row() > count())
		return QVariant();

	auto version = std::dynamic_pointer_cast<JavaInstall>(m_vlist[index.row()]);
	switch (role)
	{
		case VersionPointerRole:
			return qVariantFromValue(m_vlist[index.row()]);
		case VersionIdRole:
			return version->descriptor();
		case VersionRole:
			return version->id.toString();
		case RecommendedRole:
			return version->recommended;
		case PathRole:
			return version->path;
		case ArchitectureRole:
			return version->arch;
		default:
			return QVariant();
	}
}

BaseVersionList::RoleList JavaInstallList::providesRoles() const
{
	return {VersionPointerRole, VersionIdRole, VersionRole, RecommendedRole, PathRole, ArchitectureRole};
}


void JavaInstallList::updateListData(QList<BaseVersionPtr> versions)
{
	beginResetModel();
	m_vlist = versions;
	sortVersions();
	if(m_vlist.size())
	{
		auto best = std::dynamic_pointer_cast<JavaInstall>(m_vlist[0]);
		best->recommended = true;
	}
	endResetModel();
	m_status = Status::Done;
	m_loadTask.reset();
}

bool sortJavas(BaseVersionPtr left, BaseVersionPtr right)
{
	auto rleft = std::dynamic_pointer_cast<JavaInstall>(left);
	auto rright = std::dynamic_pointer_cast<JavaInstall>(right);
	return (*rleft) > (*rright);
}

void JavaInstallList::sortVersions()
{
	beginResetModel();
	std::sort(m_vlist.begin(), m_vlist.end(), sortJavas);
	endResetModel();
}

JavaListLoadTask::JavaListLoadTask(JavaInstallList *vlist) : Task()
{
	m_list = vlist;
	m_currentRecommended = NULL;
}

JavaListLoadTask::~JavaListLoadTask()
{
}

void JavaListLoadTask::executeTask()
{
	setStatus(tr("Detecting Java installations..."));

	JavaUtils ju;
	QList<QString> candidate_paths = ju.FindJavaPaths();

	m_job = std::shared_ptr<JavaCheckerJob>(new JavaCheckerJob("Java detection"));
	connect(m_job.get(), &Task::finished, this, &JavaListLoadTask::javaCheckerFinished);
	connect(m_job.get(), &Task::progress, this, &Task::setProgress);

	qDebug() << "Probing the following Java paths: ";
	int id = 0;
	for(QString candidate : candidate_paths)
	{
		qDebug() << " " << candidate;

		auto candidate_checker = new JavaChecker();
		candidate_checker->m_path = candidate;
		candidate_checker->m_id = id;
		m_job->addJavaCheckerAction(JavaCheckerPtr(candidate_checker));

		id++;
	}

	m_job->start();
}

void JavaListLoadTask::javaCheckerFinished()
{
	QList<JavaInstallPtr> candidates;
	auto results = m_job->getResults();

	qDebug() << "Found the following valid Java installations:";
	for(JavaCheckResult result : results)
	{
		if(result.validity == JavaCheckResult::Validity::Valid)
		{
			JavaInstallPtr javaVersion(new JavaInstall());

			javaVersion->id = result.javaVersion;
			javaVersion->arch = result.mojangPlatform;
			javaVersion->path = result.path;
			candidates.append(javaVersion);

			qDebug() << " " << javaVersion->id.toString() << javaVersion->arch << javaVersion->path;
		}
	}

	QList<BaseVersionPtr> javas_bvp;
	for (auto java : candidates)
	{
		//qDebug() << java->id << java->arch << " at " << java->path;
		BaseVersionPtr bp_java = std::dynamic_pointer_cast<BaseVersion>(java);

		if (bp_java)
		{
			javas_bvp.append(java);
		}
	}

	m_list->updateListData(javas_bvp);
	emitSucceeded();
}