/****************************************************************************
Copyright (c) 2013-2014 Chukong Technologies Inc.

http://www.cocos2d-x.org

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.
****************************************************************************/

#ifndef __UIPAGEVIEW_H__
#define __UIPAGEVIEW_H__

#include "ui/UILayout.h"
#include "ui/GUIExport.h"

NS_CC_BEGIN

namespace ui {

typedef enum
{
    PAGEVIEW_EVENT_TURNING,
}PageViewEventType;

typedef void (Ref::*SEL_PageViewEvent)(Ref*, PageViewEventType);
#define pagevieweventselector(_SELECTOR)(SEL_PageViewEvent)(&_SELECTOR)

class CC_GUI_DLL PageView : public Layout
{
    
    DECLARE_CLASS_GUI_INFO
    
public:
    enum class EventType
    {
        TURNING
    };
    
    enum class TouchDirection
    {
        LEFT,
        RIGHT
    };
    
    typedef std::function<void(Ref*,EventType)> ccPageViewCallback;
    /**
     * Default constructor
     */
    PageView();
    
    /**
     * Default destructor
     */
    virtual ~PageView();
    
    /**
     * Allocates and initializes.
     */
    static PageView* create();
    
    /**
     * Add a widget to a page of pageview.
     *
     * @param widget    widget to be added to pageview.
     *
     * @param pageIdx   index of page.
     *
     * @param forceCreate   if force create and there is no page exsit, pageview would create a default page for adding widget.
     */
    void addWidgetToPage(Widget* widget, ssize_t pageIdx, bool forceCreate);
    
    /**
     * Push back a page to pageview.
     *
     * @param page    page to be added to pageview.
     */
    void addPage(Layout* page);
    
    /**
     * Insert a page to pageview.
     *
     * @param page    page to be added to pageview.
     */
    void insertPage(Layout* page, int idx);
    
    /**
     * Remove a page of pageview.
     *
     * @param page    page which will be removed.
     */
    void removePage(Layout* page);

    /**
     * Remove a page at index of pageview.
     *
     * @param index    index of page.
     */
    void removePageAtIndex(ssize_t index);
    
    void removeAllPages();
    
    /**
     * scroll pageview to index.
     *
     * @param idx    index of page.
     */
    void scrollToPage(ssize_t idx);
    
    /**
     * Gets current page index.
     *
     * @return current page index.
     */
    ssize_t getCurPageIndex() const;
    
    
    Vector<Layout*>& getPages();
    
    Layout* getPage(ssize_t index);
    
    // event
    CC_DEPRECATED_ATTRIBUTE void addEventListenerPageView(Ref *target, SEL_PageViewEvent selector);
    void addEventListener(const ccPageViewCallback& callback);
    
    virtual bool onTouchBegan(Touch *touch, Event *unusedEvent) override;
    virtual void onTouchMoved(Touch *touch, Event *unusedEvent) override;
    virtual void onTouchEnded(Touch *touch, Event *unusedEvent) override;
    virtual void onTouchCancelled(Touch *touch, Event *unusedEvent) override;
    
    //override "update" method of widget.
    virtual void update(float dt) override;
    /**
     * Sets LayoutType.
     *
     * @see LayoutType
     *
     * @param type LayoutType
     */
    virtual void setLayoutType(Type type) override{};
    
    /**
     * Gets LayoutType.
     *
     * @see LayoutType
     *
     * @return LayoutType
     */
    virtual Type getLayoutType() const override{return Type::ABSOLUTE;};
    
    /**
     * Returns the "class name" of widget.
     */
    virtual std::string getDescription() const override;

    virtual void onEnter() override;
    /**
     * @brief If you don't specify the value, the pageView will scroll when half pageview width reached
     */
    void setCustomScrollThreshold(float threshold);
    /**
     *@brief Return user defined scroll page threshold
     */
    float getCustomScrollThreshold()const;
    /**
     *@brief Set using user defined scroll page threshold or not
     * If you set it to false, then the default scroll threshold is pageView.width / 2
     */
    void setUsingCustomScrollThreshold(bool flag);
    /**
     *@brief Query whether we are using user defined scroll page threshold or not
     */
    bool isUsingCustomScrollThreshold()const;

CC_CONSTRUCTOR_ACCESS:
    virtual bool init() override;

protected:

    Layout* createPage();
    float getPositionXByIndex(ssize_t idx)const;
    ssize_t getPageCount()const;

    void updateBoundaryPages();
    virtual bool scrollPages(float touchOffset);
    void movePages(float offset);
    void pageTurningEvent();
    void updateAllPagesSize();
    void updateAllPagesPosition();
    void autoScroll(float dt);

    virtual void handleMoveLogic(Touch *touch) ;
    virtual void handleReleaseLogic(Touch *touch) ;
    virtual void interceptTouchEvent(TouchEventType event, Widget* sender,Touch *touch) ;
    
    
    virtual void onSizeChanged() override;
    virtual Widget* createCloneInstance() override;
    virtual void copySpecialProperties(Widget* model) override;
    virtual void copyClonedWidgetChildren(Widget* model) override;

    virtual void doLayout() override;

protected:
    enum class AutoScrollDirection
    {
        LEFT,
        RIGHT
    };
    bool _isAutoScrolling;
    float _autoScrollDistance;
    float _autoScrollSpeed;
    AutoScrollDirection _autoScrollDirection;
    
    ssize_t _curPageIdx;
    Vector<Layout*> _pages;

    TouchDirection _touchMoveDirection;
   
    Widget* _leftBoundaryChild;
    Widget* _rightBoundaryChild;
    
    float _leftBoundary;
    float _rightBoundary;
    float _customScrollThreshold;
    bool _usingCustomCrollThreshold;

    float _childFocusCancelOffset;

    Ref* _pageViewEventListener;
#if defined(__GNUC__) && ((__GNUC__ >= 4) || ((__GNUC__ == 3) && (__GNUC_MINOR__ >= 1)))
#pragma GCC diagnostic ignored "-Wdeprecated-declarations"
#elif _MSC_VER >= 1400 //vs 2005 or higher
#pragma warning (push)
#pragma warning (disable: 4996)
#endif
    SEL_PageViewEvent _pageViewEventSelector;
#if defined(__GNUC__) && ((__GNUC__ >= 4) || ((__GNUC__ == 3) && (__GNUC_MINOR__ >= 1)))
#pragma GCC diagnostic warning "-Wdeprecated-declarations"
#elif _MSC_VER >= 1400 //vs 2005 or higher
#pragma warning (pop)
#endif
    ccPageViewCallback _eventCallback;
};

}
NS_CC_END

#endif /* defined(__PageView__) */