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**
** Copyright (C) 2019 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
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** This file is part of Qt Creator.
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** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3 as published by the Free Software
** Foundation with exceptions as appearing in the file LICENSE.GPL3-EXCEPT
** included in the packaging of this file. Please review the following
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#include "qmlpreviewconnectionmanager.h"

#include <coreplugin/icore.h>
#include <coreplugin/messagemanager.h>
#include <qtsupport/baseqtversion.h>

#include <QFileInfo>
#include <QDir>
#include <QMessageBox>

namespace QmlPreview {
namespace Internal {

QmlPreviewConnectionManager::~QmlPreviewConnectionManager()
{
}

QmlPreviewConnectionManager::QmlPreviewConnectionManager(QObject *parent) :
    QmlDebug::QmlDebugConnectionManager(parent)
{
    setTarget(nullptr);
}

void QmlPreviewConnectionManager::setTarget(ProjectExplorer::Target *target)
{
    QtSupport::BaseQtVersion::populateQmlFileFinder(&m_projectFileFinder, target);
    m_projectFileFinder.setAdditionalSearchDirectories(Utils::FilePaths());
    m_targetFileFinder.setTarget(target);
}

void QmlPreviewConnectionManager::setFileLoader(QmlPreviewFileLoader fileLoader)
{
    m_fileLoader = fileLoader;
}

void QmlPreviewConnectionManager::setFileClassifier(QmlPreviewFileClassifier fileClassifier)
{
    m_fileClassifier = fileClassifier;
}

void QmlPreviewConnectionManager::setFpsHandler(QmlPreviewFpsHandler fpsHandler)
{
    m_fpsHandler = fpsHandler;
}

void QmlPreviewConnectionManager::createClients()
{
    createPreviewClient();
    createDebugTranslationClient();
}

QUrl QmlPreviewConnectionManager::findValidI18nDirectoryAsUrl(const QString &locale)
{
    const QString shortLocale = locale.left(locale.indexOf("_"));
    QString path = m_lastLoadedUrl.path();

    while (!path.isEmpty()) {
        path = path.left(qMax(0, path.lastIndexOf("/")));
        QUrl url = m_lastLoadedUrl;

        auto tryPath = [&](const QString &postfix) {
            url.setPath(path + "/i18n/qml_" + postfix);
            bool success = false;
            m_projectFileFinder.findFile(url, &success);
            return success;
        };

        if (tryPath(locale + ".qm"))
            break;
        if (tryPath(locale))
            break;
        if (tryPath(shortLocale + ".qm"))
            break;
        if (tryPath(shortLocale))
            break;
    }

    QUrl url = m_lastLoadedUrl;
    url.setPath(path);
    return url;
}

void QmlPreviewConnectionManager::createDebugTranslationClient()
{
    m_qmlDebugTranslationClient = new QmlDebugTranslationClient(connection());
    QObject::connect(this, &QmlPreviewConnectionManager::language,
                     m_qmlDebugTranslationClient.data(), [this](const QString &locale) {

        // service expects a context URL.
        // Search the parent directories of the last loaded URL for i18n files.
        m_qmlDebugTranslationClient->changeLanguage(findValidI18nDirectoryAsUrl(locale), locale);
    });
    QObject::connect(m_qmlDebugTranslationClient.data(), &QmlDebugTranslationClient::debugServiceUnavailable,
                     this, []() {
        QMessageBox::warning(Core::ICore::dialogParent(), "Error connect to QML DebugTranslation service",
                             "QML DebugTranslation feature is not available for this version of Qt.");
    }, Qt::QueuedConnection); // Queue it, so that it interfere with the connection timer
}

void QmlPreviewConnectionManager::createPreviewClient()
{
    m_qmlPreviewClient = new QmlPreviewClient(connection());

    QObject::connect(
                this, &QmlPreviewConnectionManager::loadFile, m_qmlPreviewClient.data(),
                [this](const QString &filename, const QString &changedFile,
                       const QByteArray &contents) {
        if (!m_fileClassifier(changedFile)) {
            emit restart();
            return;
        }

        bool success = false;
        const QString remoteChangedFile = m_targetFileFinder.findPath(changedFile, &success);
        if (success)
            m_qmlPreviewClient->announceFile(remoteChangedFile, contents);
        else
            m_qmlPreviewClient->clearCache();

        m_lastLoadedUrl = m_targetFileFinder.findUrl(filename);
        m_qmlPreviewClient->loadUrl(m_lastLoadedUrl);
    });

    QObject::connect(this, &QmlPreviewConnectionManager::rerun,
                     m_qmlPreviewClient.data(), &QmlPreviewClient::rerun);

    QObject::connect(this, &QmlPreviewConnectionManager::zoom,
                     m_qmlPreviewClient.data(), &QmlPreviewClient::zoom);

    QObject::connect(this, &QmlPreviewConnectionManager::language,
                     m_qmlPreviewClient.data(), [this](const QString &locale) {

        // service expects a context URL.
        // Search the parent directories of the last loaded URL for i18n files.
        m_qmlPreviewClient->language(findValidI18nDirectoryAsUrl(locale), locale);
    });

    QObject::connect(m_qmlPreviewClient.data(), &QmlPreviewClient::pathRequested,
                     this, [this](const QString &path) {
        const bool found = m_projectFileFinder.findFileOrDirectory(
                    path, [&](const QString &filename, int confidence) {
            if (m_fileLoader && confidence == path.length()) {
                bool success = false;
                QByteArray contents = m_fileLoader(filename, &success);
                if (success) {
                    if (!m_fileSystemWatcher.watchesFile(filename)) {
                        m_fileSystemWatcher.addFile(filename,
                            Utils::FileSystemWatcher::WatchModifiedDate);
                    }
                    m_qmlPreviewClient->announceFile(path, contents);
                } else {
                    m_qmlPreviewClient->announceError(path);
                }
            } else {
                m_qmlPreviewClient->announceError(path);
            }
        }, [&](const QStringList &entries, int confidence) {
            if (confidence == path.length())
                m_qmlPreviewClient->announceDirectory(path, entries);
            else
                m_qmlPreviewClient->announceError(path);
        });

        if (!found)
            m_qmlPreviewClient->announceError(path);
    });

    QObject::connect(m_qmlPreviewClient.data(), &QmlPreviewClient::errorReported,
                     this, [](const QString &error) {
        Core::MessageManager::write("Error loading QML Live Preview:");
        Core::MessageManager::write(error);
    });

    QObject::connect(m_qmlPreviewClient.data(), &QmlPreviewClient::fpsReported,
                     this, [this](const QmlPreviewClient::FpsInfo &frames) {
        if (m_fpsHandler) {
            quint16 stats[] = {
                frames.numSyncs, frames.minSync, frames.maxSync, frames.totalSync,
                frames.numRenders, frames.minRender, frames.maxRender, frames.totalRender
            };
            m_fpsHandler(stats);
        }
    });

    QObject::connect(m_qmlPreviewClient.data(), &QmlPreviewClient::debugServiceUnavailable,
                     this, []() {
        QMessageBox::warning(Core::ICore::dialogParent(), "Error loading QML Live Preview",
                             "QML Live Preview is not available for this version of Qt.");
    }, Qt::QueuedConnection); // Queue it, so that it interfere with the connection timer

    QObject::connect(&m_fileSystemWatcher, &Utils::FileSystemWatcher::fileChanged,
                     m_qmlPreviewClient.data(), [this](const QString &changedFile) {
        if (!m_fileLoader || !m_lastLoadedUrl.isValid())
            return;

        bool success = false;

        const QByteArray contents = m_fileLoader(changedFile, &success);
        if (!success)
            return;

        if (!m_fileClassifier(changedFile)) {
            emit restart();
            return;
        }

        const QString remoteChangedFile = m_targetFileFinder.findPath(changedFile, &success);
        if (success)
            m_qmlPreviewClient->announceFile(remoteChangedFile, contents);
        else
            m_qmlPreviewClient->clearCache();

        m_qmlPreviewClient->loadUrl(m_lastLoadedUrl);
    });
}

void QmlPreviewConnectionManager::clearClient(QObject *client)
{
    if (client) {
        disconnect(client, nullptr, this, nullptr);
        disconnect(this, nullptr, client, nullptr);
        client->deleteLater();
    }
};


void QmlPreviewConnectionManager::destroyClients()
{
    clearClient(m_qmlPreviewClient);
    clearClient(m_qmlDebugTranslationClient);
    m_fileSystemWatcher.removeFiles(m_fileSystemWatcher.files());
    QTC_ASSERT(m_fileSystemWatcher.directories().isEmpty(),
               m_fileSystemWatcher.removeDirectories(m_fileSystemWatcher.directories()));
}

} // namespace Internal
} // namespace QmlPreview