/**************************************************************************
**
** Copyright (c) 2014 Dmitry Savchenko
** Copyright (c) 2014 Vasiliy Sorokin
** Contact: http://www.qt-project.org/legal
**
** This file is part of Qt Creator.
**
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** use the contact form at http://qt.digia.com/contact-us.
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** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 2.1 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL included in the
** packaging of this file.  Please review the following information to
** ensure the GNU Lesser General Public License version 2.1 requirements
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****************************************************************************/

#include "todoitemsprovider.h"
#include "constants.h"
#include "cpptodoitemsscanner.h"
#include "qmljstodoitemsscanner.h"
#include "todoitemsmodel.h"
#include "todoitemsscanner.h"

#include <projectexplorer/projectexplorer.h>
#include <coreplugin/editormanager/editormanager.h>
#include <projectexplorer/session.h>

#include <QTimer>

using namespace ProjectExplorer;

namespace Todo {
namespace Internal {

TodoItemsProvider::TodoItemsProvider(Settings settings, QObject *parent) :
    QObject(parent),
    m_settings(settings)
{
    setupItemsModel();
    setupStartupProjectBinding();
    setupCurrentEditorBinding();
    setupUpdateListTimer();
    createScanners();
}

TodoItemsModel *TodoItemsProvider::todoItemsModel()
{
    return m_itemsModel;
}

void TodoItemsProvider::settingsChanged(const Settings &newSettings)
{
    if (newSettings.keywords != m_settings.keywords)
        foreach (TodoItemsScanner *scanner, m_scanners)
            scanner->setKeywordList(newSettings.keywords);

    m_settings = newSettings;

    updateList();
}

void TodoItemsProvider::updateList()
{
    m_itemsList.clear();

    // Show only items of the current file if any
    if (m_settings.scanningScope == ScanningScopeCurrentFile) {
        if (m_currentEditor)
            m_itemsList = m_itemsHash.value(m_currentEditor->document()->filePath());
    // Show only items of the startup project if any
    } else {
        if (m_startupProject)
            setItemsListWithinStartupProject();
    }

    m_itemsModel->todoItemsListUpdated();
}

void TodoItemsProvider::createScanners()
{
    qRegisterMetaType<QList<TodoItem> >("QList<TodoItem>");

    if (CppTools::CppModelManagerInterface::instance())
        m_scanners << new CppTodoItemsScanner(m_settings.keywords, this);

    if (QmlJS::ModelManagerInterface::instance())
        m_scanners << new QmlJsTodoItemsScanner(m_settings.keywords, this);

    foreach (TodoItemsScanner *scanner, m_scanners)
        connect(scanner, SIGNAL(itemsFetched(QString,QList<TodoItem>)), this,
            SLOT(itemsFetched(QString,QList<TodoItem>)), Qt::QueuedConnection);
}

void TodoItemsProvider::setItemsListWithinStartupProject()
{
    QHashIterator<QString, QList<TodoItem> > it(m_itemsHash);
    QSet<QString> fileNames = QSet<QString>::fromList(m_startupProject->files(ProjectExplorer::Project::ExcludeGeneratedFiles));
    while (it.hasNext()) {
        it.next();
        if (fileNames.contains(it.key()))
            m_itemsList << it.value();
    }
}

void TodoItemsProvider::itemsFetched(const QString &fileName, const QList<TodoItem> &items)
{
    // Replace old items with new ones
    m_itemsHash.insert(fileName, items);

    m_shouldUpdateList = true;
}

void TodoItemsProvider::startupProjectChanged(ProjectExplorer::Project *project)
{
    m_startupProject = project;
    updateList();
}

void TodoItemsProvider::projectsFilesChanged()
{
    updateList();
}

void TodoItemsProvider::currentEditorChanged(Core::IEditor *editor)
{
    m_currentEditor = editor;
    if (m_settings.scanningScope == ScanningScopeCurrentFile)
        updateList();
}

void TodoItemsProvider::updateListTimeoutElapsed()
{
    if (m_shouldUpdateList) {
        m_shouldUpdateList = false;
        updateList();
    }
}

void TodoItemsProvider::setupStartupProjectBinding()
{
    m_startupProject = SessionManager::startupProject();
    connect(SessionManager::instance(), SIGNAL(startupProjectChanged(ProjectExplorer::Project*)),
        SLOT(startupProjectChanged(ProjectExplorer::Project*)));
    connect(ProjectExplorerPlugin::instance(), SIGNAL(fileListChanged()), SLOT(projectsFilesChanged()));
}

void TodoItemsProvider::setupCurrentEditorBinding()
{
    m_currentEditor = Core::EditorManager::currentEditor();
    connect(Core::EditorManager::instance(), SIGNAL(currentEditorChanged(Core::IEditor*)),
        SLOT(currentEditorChanged(Core::IEditor*)));
}

void TodoItemsProvider::setupUpdateListTimer()
{
    m_shouldUpdateList = false;
    QTimer *timer = new QTimer(this);
    connect(timer, SIGNAL(timeout()), SLOT(updateListTimeoutElapsed()));
    timer->start(Constants::OUTPUT_PANE_UPDATE_INTERVAL);
}

void TodoItemsProvider::setupItemsModel()
{
    m_itemsModel = new TodoItemsModel(this);
    m_itemsModel->setTodoItemsList(&m_itemsList);
}

}
}