/*
 * Copyright (C) 2009, 2010, 2011, 2012 Research In Motion Limited. All rights reserved.
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 */

#ifndef InputHandler_h
#define InputHandler_h

#include <BlackBerryPlatformInputEvents.h>

#include <imf/input_data.h>

#include <wtf/RefPtr.h>

namespace WTF {
class String;
}

namespace WebCore {
class AttributeTextStyle;
class Element;
class Frame;
class HTMLInputElement;
class HTMLSelectElement;
class IntRect;
class Node;
}

namespace BlackBerry {

namespace Platform {
class KeyboardEvent;
}

namespace WebKit {

class WebPagePrivate;

class InputHandler {
public:
    InputHandler(WebPagePrivate*);
    ~InputHandler();

    enum FocusElementType { TextEdit, TextPopup /* Date/Time & Color */, SelectPopup, Plugin };
    enum CaretScrollType { CenterAlways, CenterIfNeeded, EdgeIfNeeded };

    void enableInputMode(bool inputModeAllowed = true);

    void focusedNodeChanged();
    void nodeTextChanged(const WebCore::Node*);
    void selectionChanged();
    void frameUnloaded(const WebCore::Frame*);

    bool handleKeyboardInput(const BlackBerry::Platform::KeyboardEvent&, bool changeIsPartOfComposition = false);

    bool deleteSelection();
    void insertText(const WTF::String&);
    void clearField();

    void cut();
    void copy();
    void paste();

    void cancelSelection();

    void setInputValue(const WTF::String&);

    void setDelayKeyboardVisibilityChange(bool value);
    void processPendingKeyboardVisibilityChange();

    void notifyClientOfKeyboardVisibilityChange(bool visible);

    bool isInputMode() const { return isActiveTextEdit(); }
    bool isMultilineInputMode() const { return isActiveTextEdit() && elementType(m_currentFocusElement.get()) == BlackBerry::Platform::InputTypeTextArea; }

    void ensureFocusElementVisible(bool centerFieldInDisplay = true);
    void handleInputLocaleChanged(bool isRTL);

    // PopupMenu methods.
    bool willOpenPopupForNode(WebCore::Node*);
    bool didNodeOpenPopup(WebCore::Node*);
    bool openLineInputPopup(WebCore::HTMLInputElement*);
    bool openSelectPopup(WebCore::HTMLSelectElement*);
    void setPopupListIndex(int);
    void setPopupListIndexes(int size, bool* selecteds);

    bool processingChange() const { return m_processingChange; }
    void setProcessingChange(bool processingChange) { m_processingChange = processingChange; }

    WTF::String elementText();

    // IMF driven calls.
    bool setBatchEditingActive(bool);
    bool setSelection(int start, int end, bool changeIsPartOfComposition = false);
    int caretPosition() const;
    bool deleteTextRelativeToCursor(int leftOffset, int rightOffset);

    spannable_string_t* selectedText(int32_t flags);
    spannable_string_t* textBeforeCursor(int32_t length, int32_t flags);
    spannable_string_t* textAfterCursor(int32_t length, int32_t flags);
    extracted_text_t* extractedTextRequest(extracted_text_request_t*, int32_t flags);

    int32_t setComposingRegion(int32_t start, int32_t end);
    int32_t finishComposition();
    int32_t setComposingText(spannable_string_t*, int32_t relativeCursorPosition);
    int32_t commitText(spannable_string_t*, int32_t relativeCursorPosition);

private:
    enum PendingKeyboardStateChange { NoChange, Visible, NotVisible };

    void setElementFocused(WebCore::Element*);
    void setPluginFocused(WebCore::Element*);
    void setElementUnfocused(bool refocusOccuring = false);

    void ensureFocusTextElementVisible(CaretScrollType = CenterAlways);
    void ensureFocusPluginElementVisible();

    void clearCurrentFocusElement();

    bool selectionAtStartOfElement();
    bool selectionAtEndOfElement();

    WebCore::IntRect rectForCaret(int index);

    bool isActiveTextEdit() const { return m_currentFocusElement && m_currentFocusElementType == TextEdit; }
    bool isActiveTextPopup() const { return m_currentFocusElement && m_currentFocusElementType == TextPopup; }
    bool isActiveSelectPopup() const { return m_currentFocusElement && m_currentFocusElementType == SelectPopup; }
    bool isActivePlugin() const { return m_currentFocusElement && m_currentFocusElementType == Plugin; }

    bool openDatePopup(WebCore::HTMLInputElement*, BlackBerry::Platform::BlackBerryInputType);
    bool openColorPopup(WebCore::HTMLInputElement*);

    bool executeTextEditCommand(const WTF::String&);

    BlackBerry::Platform::BlackBerryInputType elementType(WebCore::Element*) const;

    int selectionStart() const;
    int selectionEnd() const;
    int selectionPosition(bool start) const;
    bool selectionActive() const { return selectionStart() != selectionEnd(); }

    bool compositionActive() const { return compositionLength(); }
    unsigned compositionLength() const { return m_composingTextEnd - m_composingTextStart; }

    spannable_string_t* spannableTextInRange(int start, int end, int32_t flags);

    void addAttributedTextMarker(int start, int end, const WebCore::AttributeTextStyle&);
    void removeAttributedTextMarker();

    bool deleteText(int start, int end);
    bool setTextAttributes(int insertionPoint, spannable_string_t*);
    bool setText(spannable_string_t*);
    bool setSpannableTextAndRelativeCursor(spannable_string_t*, int relativeCursorPosition, bool markTextAsComposing);
    bool removeComposedText();
    bool setRelativeCursorPosition(int insertionPoint, int relativeCursorPosition);
    bool setCursorPosition(int location);

    span_t* firstSpanInString(spannable_string_t*, SpannableStringAttribute);
    bool isTrailingSingleCharacter(span_t*, unsigned, unsigned);

    void learnText();
    void sendLearnTextDetails(const WTF::String&);

    WebPagePrivate* m_webPage;

    RefPtr<WebCore::Element> m_currentFocusElement;
    bool m_inputModeEnabled;

    bool m_processingChange;
    bool m_changingFocus;

    FocusElementType m_currentFocusElementType;
    int m_currentFocusElementTextEditMask;

    int m_composingTextStart;
    int m_composingTextEnd;

    PendingKeyboardStateChange m_pendingKeyboardVisibilityChange;
    bool m_delayKeyboardVisibilityChange;
};

}
}

#endif // InputHandler_h