/*
 * Copyright (C) 2006, 2007 Apple Inc. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 
 */

#include "config.h"
#include "DOMWindow.h"

#include "BarInfo.h"
#include "CSSComputedStyleDeclaration.h"
#include "CSSRuleList.h"
#include "CSSStyleSelector.h"
#include "Chrome.h"
#include "Console.h"
#include "DOMSelection.h"
#include "Database.h"
#include "Document.h"
#include "Element.h"
#include "FloatRect.h"
#include "Frame.h"
#include "FrameLoader.h"
#include "FrameTree.h"
#include "FrameView.h"
#include "History.h"
#include "Page.h"
#include "PlatformScreen.h"
#include "PlatformString.h"
#include "Screen.h"
#include <algorithm>
#include <wtf/MathExtras.h>

using std::min;
using std::max;

namespace WebCore {

// This function:
// 1) Validates the pending changes are not changing to NaN
// 2) Constrains the window rect to no smaller than 100 in each dimension and no
//    bigger than the the float rect's dimensions.
// 3) Constrain window rect to within the top and left boundaries of the screen rect
// 4) Constraint the window rect to within the bottom and right boundaries of the
//    screen rect.
// 5) Translate the window rect coordinates to be within the coordinate space of
//    the screen rect.
void DOMWindow::adjustWindowRect(const FloatRect& screen, FloatRect& window, const FloatRect& pendingChanges)
{
    // Make sure we're in a valid state before adjusting dimensions
    ASSERT(!isnan(screen.x()) && !isnan(screen.y()) && !isnan(screen.width()) && !isnan(screen.height()) &&
           !isnan(window.x()) && !isnan(window.y()) && !isnan(window.width()) && !isnan(window.height()));
    
    // Update window values if they are not NaN
    if (!isnan(pendingChanges.x()))
        window.setX(pendingChanges.x());
    if (!isnan(pendingChanges.y()))
        window.setY(pendingChanges.y());
    if (!isnan(pendingChanges.width()))
        window.setWidth(pendingChanges.width());
    if (!isnan(pendingChanges.height()))
        window.setHeight(pendingChanges.height());
    
    // Resize the window to between 100 and the screen width and height if it's
    // outside of those ranges.
    window.setWidth(min(max(100.0f, window.width()), screen.width()));
    window.setHeight(min(max(100.0f, window.height()), screen.height()));
    
    // Constrain the window to the top and left of the screen if it's left or
    // above it.
    window.setX(max(window.x(), screen.x()));
    window.setY(max(window.y(), screen.y()));

    // Constrain the window to the bottom and right of the screen if it's past
    // the right or below it.
    window.setX(window.x() - max(0.0f, window.right() - screen.width() - screen.x()));
    window.setY(window.y() - max(0.0f, window.bottom() - screen.height() - screen.y()));
}

DOMWindow::DOMWindow(Frame* frame)
    : m_frame(frame)
{
}

DOMWindow::~DOMWindow()
{
}

void DOMWindow::disconnectFrame()
{
    m_frame = 0;
    clear();
}

void DOMWindow::clear()
{
    if (m_screen)
        m_screen->disconnectFrame();
    m_screen = 0;

    if (m_selection)
        m_selection->disconnectFrame();
    m_selection = 0;

    if (m_history)
        m_history->disconnectFrame();
    m_history = 0;

    if (m_locationbar)
        m_locationbar->disconnectFrame();
    m_locationbar = 0;

    if (m_menubar)
        m_menubar->disconnectFrame();
    m_menubar = 0;

    if (m_personalbar)
        m_personalbar->disconnectFrame();
    m_personalbar = 0;

    if (m_scrollbars)
        m_scrollbars->disconnectFrame();
    m_scrollbars = 0;

    if (m_statusbar)
        m_statusbar->disconnectFrame();
    m_statusbar = 0;

    if (m_toolbar)
        m_toolbar->disconnectFrame();
    m_toolbar = 0;

    if (m_console)
        m_console->disconnectFrame();
    m_console = 0;
}

Screen* DOMWindow::screen() const
{
    if (!m_screen)
        m_screen = new Screen(m_frame);
    return m_screen.get();
}

History* DOMWindow::history() const
{
    if (!m_history)
        m_history = new History(m_frame);
    return m_history.get();
}

BarInfo* DOMWindow::locationbar() const
{
    if (!m_locationbar)
        m_locationbar = new BarInfo(m_frame, BarInfo::Locationbar);
    return m_locationbar.get();
}

BarInfo* DOMWindow::menubar() const
{
    if (!m_menubar)
        m_menubar = new BarInfo(m_frame, BarInfo::Menubar);
    return m_menubar.get();
}

BarInfo* DOMWindow::personalbar() const
{
    if (!m_personalbar)
        m_personalbar = new BarInfo(m_frame, BarInfo::Personalbar);
    return m_personalbar.get();
}

BarInfo* DOMWindow::scrollbars() const
{
    if (!m_scrollbars)
        m_scrollbars = new BarInfo(m_frame, BarInfo::Scrollbars);
    return m_scrollbars.get();
}

BarInfo* DOMWindow::statusbar() const
{
    if (!m_statusbar)
        m_statusbar = new BarInfo(m_frame, BarInfo::Statusbar);
    return m_statusbar.get();
}

BarInfo* DOMWindow::toolbar() const
{
    if (!m_toolbar)
        m_toolbar = new BarInfo(m_frame, BarInfo::Toolbar);
    return m_toolbar.get();
}

Console* DOMWindow::console() const
{
    if (!m_console)
        m_console = new Console(m_frame);
    return m_console.get();
}

DOMSelection* DOMWindow::getSelection()
{
    if (!m_selection)
        m_selection = new DOMSelection(m_frame);
    return m_selection.get();
}

Element* DOMWindow::frameElement() const
{
    if (!m_frame)
        return 0;

    Document* doc = m_frame->document();
    ASSERT(doc);
    if (!doc)
        return 0;

    // FIXME: could this use m_frame->ownerElement() instead of going through the Document.
    return doc->ownerElement();
}

void DOMWindow::focus()
{
    if (!m_frame)
        return;

    m_frame->focusWindow();
}

void DOMWindow::blur()
{
    if (!m_frame)
        return;

    m_frame->unfocusWindow();
}

void DOMWindow::close()
{
    if (!m_frame)
        return;

    if (m_frame->loader()->openedByDOM() || m_frame->loader()->getHistoryLength() <= 1)
        m_frame->scheduleClose();
}

void DOMWindow::print()
{
    if (!m_frame)
        return;

    Page* page = m_frame->page();
    if (!page)
        return;

    page->chrome()->print(m_frame);
}

void DOMWindow::stop()
{
    if (!m_frame)
        return;

    // We must check whether the load is complete asynchronously, because we might still be parsing
    // the document until the callstack unwinds.
    m_frame->loader()->stopForUserCancel(true);
}

void DOMWindow::alert(const String& message)
{
    if (!m_frame)
        return;

    Document* doc = m_frame->document();
    ASSERT(doc);
    if (doc)
        doc->updateRendering();

    Page* page = m_frame->page();
    if (!page)
        return;

    page->chrome()->runJavaScriptAlert(m_frame, message);
}

bool DOMWindow::confirm(const String& message)
{
    if (!m_frame)
        return false;

    Document* doc = m_frame->document();
    ASSERT(doc);
    if (doc)
        doc->updateRendering();

    Page* page = m_frame->page();
    if (!page)
        return false;

    return page->chrome()->runJavaScriptConfirm(m_frame, message);
}

String DOMWindow::prompt(const String& message, const String& defaultValue)
{
    if (!m_frame)
        return String();

    Document* doc = m_frame->document();
    ASSERT(doc);
    if (doc)
        doc->updateRendering();

    Page* page = m_frame->page();
    if (!page)
        return String();

    String returnValue;
    if (page->chrome()->runJavaScriptPrompt(m_frame, message, defaultValue, returnValue))
        return returnValue;

    return String();
}

bool DOMWindow::find(const String& string, bool caseSensitive, bool backwards, bool wrap, bool wholeWord, bool searchInFrames, bool showDialog) const
{
    if (!m_frame)
        return false;

    // FIXME (13016): Support wholeWord, searchInFrames and showDialog
    return m_frame->findString(string, !backwards, caseSensitive, wrap, false);
}

bool DOMWindow::offscreenBuffering() const
{
    return true;
}

int DOMWindow::outerHeight() const
{
    if (!m_frame)
        return 0;

    Page* page = m_frame->page();
    if (!page)
        return 0;

    return static_cast<int>(page->chrome()->windowRect().height());
}

int DOMWindow::outerWidth() const
{
    if (!m_frame)
        return 0;

    Page* page = m_frame->page();
    if (!page)
        return 0;

    return static_cast<int>(page->chrome()->windowRect().width());
}

int DOMWindow::innerHeight() const
{
    if (!m_frame)
        return 0;

    FrameView* view = m_frame->view();
    if (!view)
        return 0;

    return view->height();
}

int DOMWindow::innerWidth() const
{
    if (!m_frame)
        return 0;

    FrameView* view = m_frame->view();
    if (!view)
        return 0;

    return view->width();
}

int DOMWindow::screenX() const
{
    if (!m_frame)
        return 0;

    Page* page = m_frame->page();
    if (!page)
        return 0;

    return static_cast<int>(page->chrome()->windowRect().x());
}

int DOMWindow::screenY() const
{
    if (!m_frame)
        return 0;

    Page* page = m_frame->page();
    if (!page)
        return 0;

    return static_cast<int>(page->chrome()->windowRect().y());
}

int DOMWindow::scrollX() const
{
    if (!m_frame)
        return 0;

    FrameView* view = m_frame->view();
    if (!view)
        return 0;

    Document* doc = m_frame->document();
    ASSERT(doc);
    if (doc)
        doc->updateLayoutIgnorePendingStylesheets();

    return view->contentsX();
}

int DOMWindow::scrollY() const
{
    if (!m_frame)
        return 0;

    FrameView* view = m_frame->view();
    if (!view)
        return 0;

    Document* doc = m_frame->document();
    ASSERT(doc);
    if (doc)
        doc->updateLayoutIgnorePendingStylesheets();

    return view->contentsY();
}

bool DOMWindow::closed() const
{
    return !m_frame;
}

unsigned DOMWindow::length() const
{
    if (!m_frame)
        return 0;

    return m_frame->tree()->childCount();
}

String DOMWindow::name() const
{
    if (!m_frame)
        return String();

    return m_frame->tree()->name();
}

void DOMWindow::setName(const String& string)
{
    if (!m_frame)
        return;

    m_frame->tree()->setName(string);
}

String DOMWindow::status() const
{
    if (!m_frame)
        return String();

    return m_frame->jsStatusBarText();
}

void DOMWindow::setStatus(const String& string)
{
    if (!m_frame)
        return;

    m_frame->setJSStatusBarText(string);
}

String DOMWindow::defaultStatus() const
{
    if (!m_frame)
        return String();

    return m_frame->jsDefaultStatusBarText();
}

void DOMWindow::setDefaultStatus(const String& string)
{
    if (!m_frame)
        return;

    m_frame->setJSDefaultStatusBarText(string);
}

DOMWindow* DOMWindow::self() const
{
    if (!m_frame)
        return 0;

    return m_frame->domWindow();
}

DOMWindow* DOMWindow::opener() const
{
    if (!m_frame)
        return 0;

    Frame* opener = m_frame->loader()->opener();
    if (!opener)
        return 0;

    return opener->domWindow();
}

DOMWindow* DOMWindow::parent() const
{
    if (!m_frame)
        return 0;

    Frame* parent = m_frame->tree()->parent();
    if (parent)
        return parent->domWindow();

    return m_frame->domWindow();
}

DOMWindow* DOMWindow::top() const
{
    if (!m_frame)
        return 0;

    Page* page = m_frame->page();
    if (!page)
        return 0;

    return page->mainFrame()->domWindow();
}

Document* DOMWindow::document() const
{
    if (!m_frame)
        return 0;

    ASSERT(m_frame->document());
    return m_frame->document();
}

PassRefPtr<CSSStyleDeclaration> DOMWindow::getComputedStyle(Element* elt, const String&) const
{
    if (!elt)
        return 0;

    // FIXME: This needs to work with pseudo elements.
    return new CSSComputedStyleDeclaration(elt);
}

PassRefPtr<CSSRuleList> DOMWindow::getMatchedCSSRules(Element* elt, const String& pseudoElt, bool authorOnly) const
{
    if (!m_frame)
        return 0;

    Document* doc = m_frame->document();
    ASSERT(doc);
    if (!doc)
        return 0;

    if (!pseudoElt.isEmpty())
        return doc->styleSelector()->pseudoStyleRulesForElement(elt, pseudoElt.impl(), authorOnly);
    return doc->styleSelector()->styleRulesForElement(elt, authorOnly);
}

double DOMWindow::devicePixelRatio() const
{
    if (!m_frame)
        return 0.0;

    Page* page = m_frame->page();
    if (!page)
        return 0.0;

    return page->chrome()->scaleFactor();
}

#if ENABLE(DATABASE)
PassRefPtr<Database> DOMWindow::openDatabase(const String& name, const String& version, const String& displayName, unsigned long estimatedSize, ExceptionCode& ec)
{
    if (!m_frame)
        return 0;

    Document* doc = m_frame->document();
    ASSERT(doc);
    if (!doc)
        return 0;

    return Database::openDatabase(doc, name, version, displayName, estimatedSize, ec);
}
#endif

void DOMWindow::scrollBy(int x, int y) const
{
    if (!m_frame)
        return;

    Document* doc = m_frame->document();
    ASSERT(doc);
    if (doc)
        doc->updateLayoutIgnorePendingStylesheets();

    FrameView* view = m_frame->view();
    if (!view)
        return;

    view->scrollBy(x, y);
}

void DOMWindow::scrollTo(int x, int y) const
{
    if (!m_frame)
        return;

    Document* doc = m_frame->document();
    ASSERT(doc);
    if (doc)
        doc->updateLayoutIgnorePendingStylesheets();

    FrameView* view = m_frame->view();
    if (!view)
        return;

    view->setContentsPos(x, y);
}

void DOMWindow::moveBy(float x, float y) const
{
    if (!m_frame)
        return;

    Page* page = m_frame->page();
    if (!page)
        return;

    FloatRect fr = page->chrome()->windowRect();
    FloatRect update = fr;
    update.move(x, y);
    // Security check (the spec talks about UniversalBrowserWrite to disable this check...)
    adjustWindowRect(screenAvailableRect(page->mainFrame()->view()), fr, update);
    page->chrome()->setWindowRect(fr);
}

void DOMWindow::moveTo(float x, float y) const
{
    if (!m_frame)
        return;

    Page* page = m_frame->page();
    if (!page)
        return;

    FloatRect fr = page->chrome()->windowRect();
    FloatRect sr = screenAvailableRect(page->mainFrame()->view());
    fr.setLocation(sr.location());
    FloatRect update = fr;
    update.move(x, y);     
    // Security check (the spec talks about UniversalBrowserWrite to disable this check...)
    adjustWindowRect(sr, fr, update);
    page->chrome()->setWindowRect(fr);
}

void DOMWindow::resizeBy(float x, float y) const
{
    if (!m_frame)
        return;

    Page* page = m_frame->page();
    if (!page)
        return;

    FloatRect fr = page->chrome()->windowRect();
    FloatSize dest = fr.size() + FloatSize(x, y);
    FloatRect update(fr.location(), dest);
    adjustWindowRect(screenAvailableRect(page->mainFrame()->view()), fr, update);
    page->chrome()->setWindowRect(fr);
}

void DOMWindow::resizeTo(float width, float height) const
{
    if (!m_frame)
        return;

    Page* page = m_frame->page();
    if (!page)
        return;

    FloatRect fr = page->chrome()->windowRect();
    FloatSize dest = FloatSize(width, height);
    FloatRect update(fr.location(), dest);
    adjustWindowRect(screenAvailableRect(page->mainFrame()->view()), fr, update);
    page->chrome()->setWindowRect(fr);
}

} // namespace WebCore