/*
 * Copyright (C) 2011 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 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 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. 
 */

#pragma once

#include "AccessibilityTextMarker.h"
#include "AccessibilityTextMarkerRange.h"
#include "JSWrappable.h"

#include <JavaScriptCore/JSObjectRef.h>
#include <JavaScriptCore/JSRetainPtr.h>
#include <wtf/Platform.h>
#include <wtf/Vector.h>

#if PLATFORM(COCOA)
OBJC_CLASS NSArray;
OBJC_CLASS NSString;
#include <wtf/RetainPtr.h>
using PlatformUIElement = id;
#elif HAVE(ACCESSIBILITY) && USE(ATK)
#include "AccessibilityNotificationHandlerAtk.h"
#include <atk/atk.h>
#include <wtf/glib/GRefPtr.h>
typedef GRefPtr<AtkObject> PlatformUIElement;
#else
typedef void* PlatformUIElement;
#endif

namespace WTR {

class AccessibilityController;

class AccessibilityUIElement : public JSWrappable {
#if PLATFORM(COCOA)
    // Helper functions that dispatch the corresponding AccessibilityObjectWrapper method to the AX secondary thread when appropriate.
    friend RetainPtr<NSArray> supportedAttributes(id);
    friend id attributeValue(id, NSString *);
    friend void setAttributeValue(id, NSString *, id, bool synchronous);
#endif

public:
    static Ref<AccessibilityUIElement> create(PlatformUIElement);
    static Ref<AccessibilityUIElement> create(const AccessibilityUIElement&);

    ~AccessibilityUIElement();

#if PLATFORM(COCOA)
    id platformUIElement() { return m_element.get(); }
#endif
#if !PLATFORM(COCOA)
    PlatformUIElement platformUIElement() { return m_element; }
#endif

    virtual JSClassRef wrapperClass();

    static JSObjectRef makeJSAccessibilityUIElement(JSContextRef, const AccessibilityUIElement&);

    bool isEqual(AccessibilityUIElement* otherElement);
    
    RefPtr<AccessibilityUIElement> elementAtPoint(int x, int y);
    RefPtr<AccessibilityUIElement> childAtIndex(unsigned);
    unsigned indexOfChild(AccessibilityUIElement*);
    int childrenCount();
    RefPtr<AccessibilityUIElement> titleUIElement();
    RefPtr<AccessibilityUIElement> parentElement();

    void takeFocus();
    void takeSelection();
    void addSelection();
    void removeSelection();

    // Methods - platform-independent implementations
    JSRetainPtr<JSStringRef> allAttributes();
    JSRetainPtr<JSStringRef> attributesOfLinkedUIElements();
    RefPtr<AccessibilityUIElement> linkedUIElementAtIndex(unsigned);
    
    JSRetainPtr<JSStringRef> attributesOfDocumentLinks();
    JSRetainPtr<JSStringRef> attributesOfChildren();
    JSRetainPtr<JSStringRef> parameterizedAttributeNames();
    void increment();
    void decrement();
    void showMenu();
    void press();
    bool dismiss();
#if PLATFORM(MAC)
    void syncPress();
    void asyncIncrement();
    void asyncDecrement();
#else
    void syncPress() { press(); }
    void asyncIncrement() { }
    void asyncDecrement() { };
#endif

    // Attributes - platform-independent implementations
    JSRetainPtr<JSStringRef> stringDescriptionOfAttributeValue(JSStringRef attribute);
    JSRetainPtr<JSStringRef> stringAttributeValue(JSStringRef attribute);
    double numberAttributeValue(JSStringRef attribute);
    JSValueRef uiElementArrayAttributeValue(JSStringRef attribute) const;
    RefPtr<AccessibilityUIElement> uiElementAttributeValue(JSStringRef attribute) const;
    bool boolAttributeValue(JSStringRef attribute);
#if PLATFORM(MAC)
    void attributeValueAsync(JSStringRef attribute, JSValueRef callback);
#else
    void attributeValueAsync(JSStringRef attribute, JSValueRef callback) { }
#endif
    void setBoolAttributeValue(JSStringRef attribute, bool value);
    bool isAttributeSupported(JSStringRef attribute);
    bool isAttributeSettable(JSStringRef attribute);
    bool isPressActionSupported();
    bool isIncrementActionSupported();
    bool isDecrementActionSupported();
    void setValue(JSStringRef);
    JSRetainPtr<JSStringRef> role();
    JSRetainPtr<JSStringRef> subrole();
    JSRetainPtr<JSStringRef> roleDescription();
    JSRetainPtr<JSStringRef> computedRoleString();
    JSRetainPtr<JSStringRef> title();
    JSRetainPtr<JSStringRef> description();
    JSRetainPtr<JSStringRef> language();
    JSRetainPtr<JSStringRef> stringValue();
    JSRetainPtr<JSStringRef> accessibilityValue() const;
    JSRetainPtr<JSStringRef> helpText() const;
    JSRetainPtr<JSStringRef> orientation() const;
    double x();
    double y();
    double width();
    double height();
    double intValue() const;
    double minValue();
    double maxValue();
    JSRetainPtr<JSStringRef> valueDescription();
    int insertionPointLineNumber();
    JSRetainPtr<JSStringRef> selectedTextRange();
    bool isEnabled();
    bool isRequired() const;
    
    bool isFocused() const;
    bool isFocusable() const;
    bool isSelected() const;
    bool isSelectedOptionActive() const;
    bool isSelectable() const;
    bool isMultiSelectable() const;
    void setSelectedChild(AccessibilityUIElement*) const;
    void setSelectedChildAtIndex(unsigned) const;
    void removeSelectionAtIndex(unsigned) const;
    void clearSelectedChildren() const;
    unsigned selectedChildrenCount() const;
    RefPtr<AccessibilityUIElement> selectedChildAtIndex(unsigned) const;
    
    bool isValid() const;
    bool isExpanded() const;
    bool isChecked() const;
    bool isIndeterminate() const;
    bool isVisible() const;
    bool isOffScreen() const;
    bool isCollapsed() const;
    bool isIgnored() const;
    bool isSingleLine() const;
    bool isMultiLine() const;
    bool hasPopup() const;
    JSRetainPtr<JSStringRef> popupValue() const;
    int hierarchicalLevel() const;
    double clickPointX();
    double clickPointY();
    JSRetainPtr<JSStringRef> documentEncoding();
    JSRetainPtr<JSStringRef> documentURI();
    JSRetainPtr<JSStringRef> url();
    JSRetainPtr<JSStringRef> classList() const;

    // CSS3-speech properties.
    JSRetainPtr<JSStringRef> speakAs();
    
    // Table-specific attributes
    JSRetainPtr<JSStringRef> attributesOfColumnHeaders();
    JSRetainPtr<JSStringRef> attributesOfRowHeaders();
    JSRetainPtr<JSStringRef> attributesOfColumns();
    JSRetainPtr<JSStringRef> attributesOfRows();
    JSRetainPtr<JSStringRef> attributesOfVisibleCells();
    JSRetainPtr<JSStringRef> attributesOfHeader();
    bool isInTableCell() const;
    int indexInTable();
    JSRetainPtr<JSStringRef> rowIndexRange();
    JSRetainPtr<JSStringRef> columnIndexRange();
    int rowCount();
    int columnCount();
    JSValueRef rowHeaders() const;
    JSValueRef columnHeaders() const;

    // Tree/Outline specific attributes
    RefPtr<AccessibilityUIElement> selectedRowAtIndex(unsigned);
    RefPtr<AccessibilityUIElement> disclosedByRow();
    RefPtr<AccessibilityUIElement> disclosedRowAtIndex(unsigned);
    RefPtr<AccessibilityUIElement> rowAtIndex(unsigned);

    // ARIA specific
    RefPtr<AccessibilityUIElement> ariaOwnsElementAtIndex(unsigned);
    RefPtr<AccessibilityUIElement> ariaFlowToElementAtIndex(unsigned);
    RefPtr<AccessibilityUIElement> ariaControlsElementAtIndex(unsigned);
#if PLATFORM(MAC) || USE(ATK)
    RefPtr<AccessibilityUIElement> ariaDetailsElementAtIndex(unsigned);
    RefPtr<AccessibilityUIElement> ariaErrorMessageElementAtIndex(unsigned);
#else
    RefPtr<AccessibilityUIElement> ariaDetailsElementAtIndex(unsigned) { return nullptr; }
    RefPtr<AccessibilityUIElement> ariaErrorMessageElementAtIndex(unsigned) { return nullptr; }
#endif

#if USE(ATK)
    RefPtr<AccessibilityUIElement> ariaLabelledByElementAtIndex(unsigned);
    RefPtr<AccessibilityUIElement> ariaDescribedByElementAtIndex(unsigned);
    RefPtr<AccessibilityUIElement> ariaOwnsReferencingElementAtIndex(unsigned);
    RefPtr<AccessibilityUIElement> ariaFlowToReferencingElementAtIndex(unsigned);
    RefPtr<AccessibilityUIElement> ariaControlsReferencingElementAtIndex(unsigned);
    RefPtr<AccessibilityUIElement> ariaLabelledByReferencingElementAtIndex(unsigned);
    RefPtr<AccessibilityUIElement> ariaDescribedByReferencingElementAtIndex(unsigned);
    RefPtr<AccessibilityUIElement> ariaDetailsReferencingElementAtIndex(unsigned);
    RefPtr<AccessibilityUIElement> ariaErrorMessageReferencingElementAtIndex(unsigned);
#else
    RefPtr<AccessibilityUIElement> ariaLabelledByElementAtIndex(unsigned) { return nullptr; }
    RefPtr<AccessibilityUIElement> ariaDescribedByElementAtIndex(unsigned) { return nullptr; }
    RefPtr<AccessibilityUIElement> ariaOwnsReferencingElementAtIndex(unsigned) { return nullptr; }
    RefPtr<AccessibilityUIElement> ariaFlowToReferencingElementAtIndex(unsigned) { return nullptr; }
    RefPtr<AccessibilityUIElement> ariaControlsReferencingElementAtIndex(unsigned) { return nullptr; }
    RefPtr<AccessibilityUIElement> ariaLabelledByReferencingElementAtIndex(unsigned) { return nullptr; }
    RefPtr<AccessibilityUIElement> ariaDescribedByReferencingElementAtIndex(unsigned) { return nullptr; }
    RefPtr<AccessibilityUIElement> ariaDetailsReferencingElementAtIndex(unsigned) { return nullptr; }
    RefPtr<AccessibilityUIElement> ariaErrorMessageReferencingElementAtIndex(unsigned) { return nullptr; }
#endif

    // ARIA Drag and Drop
    bool ariaIsGrabbed() const;
    // A space concatentated string of all the drop effects.
    JSRetainPtr<JSStringRef> ariaDropEffects() const;
    
    // Parameterized attributes
    int lineForIndex(int);
    JSRetainPtr<JSStringRef> rangeForLine(int);
    JSRetainPtr<JSStringRef> rangeForPosition(int x, int y);
    JSRetainPtr<JSStringRef> boundsForRange(unsigned location, unsigned length);
    bool setSelectedTextRange(unsigned location, unsigned length);
    JSRetainPtr<JSStringRef> stringForRange(unsigned location, unsigned length);
    JSRetainPtr<JSStringRef> attributedStringForRange(unsigned location, unsigned length);
    JSRetainPtr<JSStringRef> attributedStringForElement();

    bool attributedStringRangeIsMisspelled(unsigned location, unsigned length);
    unsigned uiElementCountForSearchPredicate(JSContextRef, AccessibilityUIElement* startElement, bool isDirectionNext, JSValueRef searchKey, JSStringRef searchText, bool visibleOnly, bool immediateDescendantsOnly);
    RefPtr<AccessibilityUIElement> uiElementForSearchPredicate(JSContextRef, AccessibilityUIElement* startElement, bool isDirectionNext, JSValueRef searchKey, JSStringRef searchText, bool visibleOnly, bool immediateDescendantsOnly);
    JSRetainPtr<JSStringRef> selectTextWithCriteria(JSContextRef, JSStringRef ambiguityResolution, JSValueRef searchStrings, JSStringRef replacementString, JSStringRef activity);
    JSValueRef searchTextWithCriteria(JSContextRef, JSValueRef searchStrings, JSStringRef startFrom, JSStringRef direction);

    // Text-specific
    JSRetainPtr<JSStringRef> characterAtOffset(int offset);
    JSRetainPtr<JSStringRef> wordAtOffset(int offset);
    JSRetainPtr<JSStringRef> lineAtOffset(int offset);
    JSRetainPtr<JSStringRef> sentenceAtOffset(int offset);
    
    // Table-specific
    RefPtr<AccessibilityUIElement> cellForColumnAndRow(unsigned column, unsigned row);

    // Scrollarea-specific
    RefPtr<AccessibilityUIElement> horizontalScrollbar() const;
    RefPtr<AccessibilityUIElement> verticalScrollbar() const;

    void scrollToMakeVisible();
    void scrollToGlobalPoint(int x, int y);
    void scrollToMakeVisibleWithSubFocus(int x, int y, int width, int height);
    
    // Text markers.
    RefPtr<AccessibilityTextMarkerRange> lineTextMarkerRangeForTextMarker(AccessibilityTextMarker*);
    RefPtr<AccessibilityTextMarkerRange> misspellingTextMarkerRange(AccessibilityTextMarkerRange* start, bool forward);
    RefPtr<AccessibilityTextMarkerRange> textMarkerRangeForElement(AccessibilityUIElement*);
    RefPtr<AccessibilityTextMarkerRange> textMarkerRangeForMarkers(AccessibilityTextMarker* startMarker, AccessibilityTextMarker* endMarker);
    RefPtr<AccessibilityTextMarkerRange> selectedTextMarkerRange();
    void resetSelectedTextMarkerRange();
    bool replaceTextInRange(JSStringRef, int position, int length);
    bool insertText(JSStringRef);
    RefPtr<AccessibilityTextMarker> startTextMarkerForTextMarkerRange(AccessibilityTextMarkerRange*);
    RefPtr<AccessibilityTextMarker> endTextMarkerForTextMarkerRange(AccessibilityTextMarkerRange*);
    RefPtr<AccessibilityTextMarker> endTextMarkerForBounds(int x, int y, int width, int height);
    RefPtr<AccessibilityTextMarker> startTextMarkerForBounds(int x, int y, int width, int height);
    RefPtr<AccessibilityTextMarker> textMarkerForPoint(int x, int y);
    RefPtr<AccessibilityTextMarker> previousTextMarker(AccessibilityTextMarker*);
    RefPtr<AccessibilityTextMarker> nextTextMarker(AccessibilityTextMarker*);
    RefPtr<AccessibilityUIElement> accessibilityElementForTextMarker(AccessibilityTextMarker*);
    JSRetainPtr<JSStringRef> stringForTextMarkerRange(AccessibilityTextMarkerRange*);
    JSRetainPtr<JSStringRef> attributedStringForTextMarkerRange(AccessibilityTextMarkerRange*);
    JSRetainPtr<JSStringRef> attributedStringForTextMarkerRangeWithOptions(AccessibilityTextMarkerRange*, bool);
    int textMarkerRangeLength(AccessibilityTextMarkerRange*);
    bool attributedStringForTextMarkerRangeContainsAttribute(JSStringRef, AccessibilityTextMarkerRange*);
    int indexForTextMarker(AccessibilityTextMarker*);
    bool isTextMarkerValid(AccessibilityTextMarker*);
    RefPtr<AccessibilityTextMarker> textMarkerForIndex(int);
    RefPtr<AccessibilityTextMarker> startTextMarker();
    RefPtr<AccessibilityTextMarker> endTextMarker();
    bool setSelectedVisibleTextRange(AccessibilityTextMarkerRange*);
    RefPtr<AccessibilityTextMarkerRange> leftWordTextMarkerRangeForTextMarker(AccessibilityTextMarker*);
    RefPtr<AccessibilityTextMarkerRange> rightWordTextMarkerRangeForTextMarker(AccessibilityTextMarker*);
    RefPtr<AccessibilityTextMarker> previousWordStartTextMarkerForTextMarker(AccessibilityTextMarker*);
    RefPtr<AccessibilityTextMarker> nextWordEndTextMarkerForTextMarker(AccessibilityTextMarker*);
    RefPtr<AccessibilityTextMarkerRange> paragraphTextMarkerRangeForTextMarker(AccessibilityTextMarker*);
    RefPtr<AccessibilityTextMarker> nextParagraphEndTextMarkerForTextMarker(AccessibilityTextMarker*);
    RefPtr<AccessibilityTextMarker> previousParagraphStartTextMarkerForTextMarker(AccessibilityTextMarker*);
    RefPtr<AccessibilityTextMarkerRange> sentenceTextMarkerRangeForTextMarker(AccessibilityTextMarker*);
    RefPtr<AccessibilityTextMarker> nextSentenceEndTextMarkerForTextMarker(AccessibilityTextMarker*);
    RefPtr<AccessibilityTextMarker> previousSentenceStartTextMarkerForTextMarker(AccessibilityTextMarker*);
    RefPtr<AccessibilityTextMarkerRange> textMarkerRangeMatchesTextNearMarkers(JSStringRef, AccessibilityTextMarker*, AccessibilityTextMarker*);

    // Returns an ordered list of supported actions for an element.
    JSRetainPtr<JSStringRef> supportedActions() const;
    JSRetainPtr<JSStringRef> mathPostscriptsDescription() const;
    JSRetainPtr<JSStringRef> mathPrescriptsDescription() const;

    JSRetainPtr<JSStringRef> pathDescription() const;
    
    // Notifications
    // Function callback should take one argument, the name of the notification.
    bool addNotificationListener(JSValueRef functionCallback);
    // Make sure you call remove, because you can't rely on objects being deallocated in a timely fashion.
    bool removeNotificationListener();
    
    JSRetainPtr<JSStringRef> identifier();
    JSRetainPtr<JSStringRef> traits();
    int elementTextPosition();
    int elementTextLength();
    JSRetainPtr<JSStringRef> stringForSelection();
    JSValueRef elementsForRange(unsigned location, unsigned length);
    void increaseTextSelection();
    void decreaseTextSelection();
    RefPtr<AccessibilityUIElement> linkedElement();
    RefPtr<AccessibilityUIElement> headerElementAtIndex(unsigned index);
    void assistiveTechnologySimulatedFocus();
    bool isSearchField() const;
    bool isTextArea() const;
    
    bool scrollPageUp();
    bool scrollPageDown();
    bool scrollPageLeft();
    bool scrollPageRight();
    
    // Fieldset
    bool hasContainedByFieldsetTrait();
    RefPtr<AccessibilityUIElement> fieldsetAncestorElement();
    
private:
    AccessibilityUIElement(PlatformUIElement);
    AccessibilityUIElement(const AccessibilityUIElement&);

#if !PLATFORM(COCOA)
    PlatformUIElement m_element;
#endif

    // A retained, platform specific object used to help manage notifications for this object.
#if HAVE(ACCESSIBILITY)
#if PLATFORM(COCOA)
    RetainPtr<id> m_element;
    RetainPtr<id> m_notificationHandler;
    static RefPtr<AccessibilityController> s_controller;

    void getLinkedUIElements(Vector<RefPtr<AccessibilityUIElement> >&);
    void getDocumentLinks(Vector<RefPtr<AccessibilityUIElement> >&);
    RefPtr<AccessibilityUIElement> elementForAttribute(NSString*) const;
    RefPtr<AccessibilityUIElement> elementForAttributeAtIndex(NSString*, unsigned) const;

    void getUIElementsWithAttribute(JSStringRef, Vector<RefPtr<AccessibilityUIElement> >&) const;
#endif

    void getChildren(Vector<RefPtr<AccessibilityUIElement> >&);
    void getChildrenWithRange(Vector<RefPtr<AccessibilityUIElement> >&, unsigned location, unsigned length);

#if USE(ATK)
    RefPtr<AccessibilityNotificationHandler> m_notificationHandler;
#endif
#endif
};
    
#ifdef __OBJC__
inline Optional<RefPtr<AccessibilityUIElement>> makeVectorElement(const RefPtr<AccessibilityUIElement>*, id element) { return { { AccessibilityUIElement::create(element) } }; }
#endif

} // namespace WTR