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#include "recentfiles.h"

#include "globals.h"

#include <QtCore/QDebug>

#include <QtCore/QFileInfo>

#include <QtCore/QSettings>

#include <QtCore/QString>

#include <QtCore/QStringList>

QT_BEGIN_NAMESPACE

static QString configKey()

{

    return settingPath("RecentlyOpenedFiles");

}

RecentFiles::RecentFiles(const int maxEntries)

  : m_groupOpen(false),

    m_clone1st(false),

    m_maxEntries(maxEntries)

{

    m_timer.setSingleShot(true);

    m_timer.setInterval(3 * 60 * 1000);

    connect(&m_timer, SIGNAL(timeout()), SLOT(closeGroup()));

}

/*

 * The logic is as follows:

 * - The most recent (i.e., topmost) item can be open ("in flux")

 * - The item is closed by either a timeout (3 min or so) or a

 *   "terminal action" (e.g., closing all files)

 * - While the item is open, modifications to the set of open files

 *   will modify that item instead of creating new items

 * - If the open item is modified to be equal to an existing item,

 *   the existing item is deleted, but will be re-created when the

 *   open item is modified even further

 * Cases (actions in parentheses are no-ops):

 * - identical to top item => (do nothing)

 * - closed, new item => insert at top, (clear marker)

 * - closed, existing item => move to top, mark for cloning

 * - open, new item, not marked => replace top, (clear marker)

 * - open, new item, marked => insert at top, clear marker

 * - open, existing item, not marked => replace top, delete copy, mark for cloning

 * - open, existing item, marked => insert at top, delete copy, (mark for cloning)

 * - closing clears marker

 */

void RecentFiles::addFiles(const QStringList &names)

{

    if (m_strLists.isEmpty() || names != m_strLists.first()) {

        if (m_groupOpen && !m_clone1st)

            // Group being open implies at least one item in the list

            m_strLists.removeFirst();

        m_groupOpen = true;

        // We do *not* sort the actual entries, as that would destroy the user's

        // chosen arrangement. However, we do the searching on sorted lists, so

        // we throw out (probably) obsolete arrangements.

        QList<QStringList> sortedLists = m_strLists;

        for (int i = 0; i < sortedLists.size(); ++i)

            sortedLists[i].sort();

        QStringList sortedNames = names;

        sortedNames.sort();

        int index = sortedLists.indexOf(sortedNames);

        if (index >= 0) {

            m_strLists.removeAt(index);

            m_clone1st = true;

        } else {

            if (m_strLists.count() >= m_maxEntries)

                m_strLists.removeLast();

            m_clone1st = false;

        }

        m_strLists.prepend(names);

    }

    m_timer.start();

}

void RecentFiles::closeGroup()

{

    m_timer.stop();

    m_groupOpen = false;

}

void RecentFiles::readConfig()

{

    m_strLists.clear();

    QVariant val = QSettings().value(configKey());

    if (val.type() == QVariant::StringList) // Backwards compat to Qt < 4.5

        foreach (const QString &s, val.toStringList())

            m_strLists << QStringList(QFileInfo(s).canonicalFilePath());

    else

        foreach (const QVariant &v, val.toList())

            m_strLists << v.toStringList();

}

void RecentFiles::writeConfig() const

{

    QList<QVariant> vals;

    foreach (const QStringList &sl, m_strLists)

        vals << sl;

    QSettings().setValue(configKey(), vals);

}

QT_END_NAMESPACE