// -*- c-basic-offset: 4 -*-
/*
 * Copyright (C) 2006 Apple Computer, Inc.
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Library General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library 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
 * Library General Public License for more details.
 *
 * You should have received a copy of the GNU Library General Public License
 * along with this library; see the file COPYING.LIB.  If not, write to
 * the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
 * Boston, MA 02111-1307, USA.
 */

#include "config.h"
#include "Page.h"

#include "Chrome.h"
#include "ChromeClient.h"
#include "ContextMenuClient.h"
#include "ContextMenuController.h"
#include "EditorClient.h"
#include "DragController.h"
#include "FocusController.h"
#include "Frame.h"
#include "FrameLoader.h"
#include "FrameTree.h"
#include "FrameView.h"
#include "HistoryItem.h"
#include "InspectorController.h"
#include "Logging.h"
#include "ProgressTracker.h"
#include "RenderWidget.h"
#include "SelectionController.h"
#include "Settings.h"
#include "StringHash.h"
#include "Widget.h"
#include <kjs/collector.h>
#include <kjs/JSLock.h>
#include <wtf/HashMap.h>

using namespace KJS;

namespace WebCore {

static HashSet<Page*>* allPages;
static HashMap<String, HashSet<Page*>*>* frameNamespaces;

#ifndef NDEBUG
WTFLogChannel LogWebCorePageLeaks =  { 0x00000000, "", WTFLogChannelOn };

struct PageCounter { 
    static int count; 
    ~PageCounter() 
    { 
        if (count)
            LOG(WebCorePageLeaks, "LEAK: %d Page\n", count);
    }
};
int PageCounter::count = 0;
static PageCounter pageCounter;
#endif

Page::Page(ChromeClient* chromeClient, ContextMenuClient* contextMenuClient, EditorClient* editorClient, DragClient* dragClient, InspectorClient* inspectorClient)
    : m_chrome(new Chrome(this, chromeClient))
    , m_dragCaretController(new SelectionController(0, true))
    , m_dragController(new DragController(this, dragClient))
    , m_focusController(new FocusController(this))
    , m_contextMenuController(new ContextMenuController(this, contextMenuClient))
    , m_inspectorController(new InspectorController(this, inspectorClient))
    , m_settings(new Settings(this))
    , m_progress(new ProgressTracker)
    , m_backForwardList(new BackForwardList(this))
    , m_editorClient(editorClient)
    , m_frameCount(0)
    , m_tabKeyCyclesThroughElements(true)
    , m_defersLoading(false)
    , m_parentInspectorController(0)
{
    if (!allPages) {
        allPages = new HashSet<Page*>;
        setFocusRingColorChangeFunction(setNeedsReapplyStyles);
    }

    ASSERT(!allPages->contains(this));
    allPages->add(this);

#ifndef NDEBUG
    ++PageCounter::count;
#endif
}

Page::~Page()
{
    m_mainFrame->setView(0);
    setGroupName(String());
    allPages->remove(this);
    
    for (Frame* frame = mainFrame(); frame; frame = frame->tree()->traverseNext())
        frame->pageDestroyed();
    m_editorClient->pageDestroyed();
    m_inspectorController->pageDestroyed();

    m_backForwardList->close();

#ifndef NDEBUG
    --PageCounter::count;

    // Cancel keepAlive timers, to ensure we release all Frames before exiting.
    // It's safe to do this because we prohibit closing a Page while JavaScript
    // is executing.
    Frame::cancelAllKeepAlive();
#endif
}

void Page::setMainFrame(PassRefPtr<Frame> mainFrame)
{
    ASSERT(!m_mainFrame); // Should only be called during initialization
    m_mainFrame = mainFrame;
}

BackForwardList* Page::backForwardList()
{
    return m_backForwardList.get();
}

bool Page::goBack()
{
    HistoryItem* item = m_backForwardList->backItem();
    
    if (item) {
        goToItem(item, FrameLoadTypeBack);
        return true;
    }
    return false;
}

bool Page::goForward()
{
    HistoryItem* item = m_backForwardList->forwardItem();
    
    if (item) {
        goToItem(item, FrameLoadTypeForward);
        return true;
    }
    return false;
}

void Page::goToItem(HistoryItem* item, FrameLoadType type)
{
    // Abort any current load if we're going to a history item
    m_mainFrame->loader()->stopAllLoaders();
    m_mainFrame->loader()->goToItem(item, type);
}

void Page::setGroupName(const String& name)
{
    if (frameNamespaces && !m_groupName.isEmpty()) {
        HashSet<Page*>* oldNamespace = frameNamespaces->get(m_groupName);
        if (oldNamespace) {
            oldNamespace->remove(this);
            if (oldNamespace->isEmpty()) {
                frameNamespaces->remove(m_groupName);
                delete oldNamespace;
            }
        }
    }
    m_groupName = name;
    if (!name.isEmpty()) {
        if (!frameNamespaces)
            frameNamespaces = new HashMap<String, HashSet<Page*>*>;
        HashSet<Page*>* newNamespace = frameNamespaces->get(name);
        if (!newNamespace) {
            newNamespace = new HashSet<Page*>;
            frameNamespaces->add(name, newNamespace);
        }
        newNamespace->add(this);
    }
}

const HashSet<Page*>* Page::frameNamespace() const
{
    return (frameNamespaces && !m_groupName.isEmpty()) ? frameNamespaces->get(m_groupName) : 0;
}

const HashSet<Page*>* Page::frameNamespace(const String& groupName)
{
    return (frameNamespaces && !groupName.isEmpty()) ? frameNamespaces->get(groupName) : 0;
}

void Page::setNeedsReapplyStyles()
{
    if (!allPages)
        return;
    HashSet<Page*>::iterator end = allPages->end();
    for (HashSet<Page*>::iterator it = allPages->begin(); it != end; ++it)
        for (Frame* frame = (*it)->mainFrame(); frame; frame = frame->tree()->traverseNext())
            frame->setNeedsReapplyStyles();
}

const Selection& Page::selection() const
{
    return focusController()->focusedOrMainFrame()->selectionController()->selection();
}

void Page::setDefersLoading(bool defers)
{
    if (defers == m_defersLoading)
        return;

    m_defersLoading = defers;
    for (Frame* frame = mainFrame(); frame; frame = frame->tree()->traverseNext())
        frame->loader()->setDefersLoading(defers);
}

void Page::clearUndoRedoOperations()
{
    m_editorClient->clearUndoRedoOperations();
}

} // namespace WebCore