/*
 * Copyright (C) 2011 Canonical, Ltd.
 *
 * Authors:
 *  Florian Boucault <florian.boucault@canonical.com>
 *
 * 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; version 3.
 *
 * 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/>.
 */

// Self
#include "scopes.h"

// Local
#include "scope.h"

// Qt
#include <QDebug>
#include <QtCore/QStringList>
#include <QtGui/QKeySequence>

Scopes::Scopes(QObject *parent)
    : QAbstractListModel(parent)
    , m_unityScopes(std::make_shared<unity::dash::GSettingsScopes>())
    , m_loaded(false)
{
    m_roles[Scopes::RoleScope] = "scope";
    m_roles[Scopes::RoleId] = "id";
    m_roles[Scopes::RoleVisible] = "visible";

    m_unityScopes->scope_added.connect(sigc::mem_fun(this, &Scopes::onScopeAdded));
    m_unityScopes->scope_removed.connect(sigc::mem_fun(this, &Scopes::onScopeRemoved));
    m_unityScopes->scopes_reordered.connect(sigc::mem_fun(this, &Scopes::onScopesReordered));
    m_unityScopes->LoadScopes();
}

QHash<int, QByteArray> Scopes::roleNames() const
{
    return m_roles;
}

int Scopes::rowCount(const QModelIndex& parent) const
{
    Q_UNUSED(parent)

    return m_scopes.count();
}

QVariant Scopes::data(const QModelIndex& index, int role) const
{
    Q_UNUSED(role)

    if (!index.isValid()) {
        return QVariant();
    }

    Scope* scope = m_scopes.at(index.row());

    if (role == Scopes::RoleScope) {
        return QVariant::fromValue(scope);
    } else if (role == Scopes::RoleId) {
        return QVariant::fromValue(scope->id());
    } else if (role == Scopes::RoleVisible) {
        return QVariant::fromValue(scope->visible());
    } else {
        return QVariant();
    }
}

QVariant Scopes::get(int row) const
{
    return data(QAbstractListModel::index(row), 0);
}

QVariant Scopes::get(const QString& scope_id) const
{
    Q_FOREACH(Scope* scope, m_scopes) {
        if (scope->id() == scope_id) {
            return QVariant::fromValue(scope);
        }
    }

    return QVariant();
}

bool Scopes::loaded() const
{
    return m_loaded;
}

void Scopes::onScopeAdded(const unity::dash::Scope::Ptr& scope, int /*position*/)
{
    int index = m_scopes.count();
    beginInsertRows(QModelIndex(), index, index);
    addUnityScope(scope);
    endInsertRows();

    // FIXME: do only once after all loaded?
    m_loaded = true;
    Q_EMIT loadedChanged(m_loaded);
}

void Scopes::onScopesLoaded()
{
}

void Scopes::onScopeRemoved(const unity::dash::Scope::Ptr& scope)
{
    auto id = QString::fromStdString(scope->id);
    auto index = findScopeById(id);
    if (index >= 0) {
        beginRemoveRows(QModelIndex(), index, index);
        removeUnityScope(index);
        endRemoveRows();

        Q_EMIT scopeRemoved(id, index);
    }
}

void Scopes::onScopesReordered(const unity::dash::Scopes::ScopeList& scopes)
{
    // FIXME Should use beginMoveRows()/endMoveRows() to not recreate the UI for every scope.
    beginResetModel();

    // remove existing scopes
    for (auto i=m_scopes.count()-1; i>=0; i--) {
        removeUnityScope(i);
    }

    // re-create scopes
    for (uint i=0; i<scopes.size(); i++) {
        addUnityScope(scopes[i]);
    }
    endResetModel();
}

void Scopes::onScopePropertyChanged()
{
    QModelIndex scopeIndex = index(m_scopes.indexOf(qobject_cast<Scope*>(sender())));
    Q_EMIT dataChanged(scopeIndex, scopeIndex);
}

void Scopes::addUnityScope(const unity::dash::Scope::Ptr& unity_scope)
{
    Scope* scope = new Scope(this);
    scope->setUnityScope(unity_scope);
    /* DOCME */
    QObject::connect(scope, SIGNAL(visibleChanged(bool)), this, SLOT(onScopePropertyChanged()));
    m_scopes.append(scope);
}

void Scopes::removeUnityScope(int index)
{
    Scope* scope = m_scopes.takeAt(index);

    delete scope;
}

int Scopes::findScopeById(const QString& scope_id)
{
    for (int i=0; i<m_scopes.count(); i++) {
        if (m_scopes[i]->id() == scope_id) {
            return i;
        }
    }
    return -1;
}