/****************************************************************************
 Copyright (c) 2013-2016 Chukong Technologies Inc.
 Copyright (c) 2017-2018 Xiamen Yaji Software Co., Ltd.

 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,
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 ****************************************************************************/

#ifndef __LAYOUTPARMETER_H__
#define __LAYOUTPARMETER_H__

#include <string>
#include "base/CCRef.h"
#include "ui/GUIExport.h"

/**
 * @addtogroup ui
 * @{
 */
NS_CC_BEGIN

namespace ui
{

/**
 *@brief Margin of widget's in point. Margin value should be positive.
 *@lua NA
 */
class CC_GUI_DLL Margin
{
public:
    /**
     * Left margin.
     */
    float left;
    /**
     * Top margin.
     */
    float top;
    /**
     * Right margin.
     */
    float right;
    /**
     * Bottom margin.
     */
    float bottom;

public:
    /**
     * Default constructor.
     */
    Margin();

    /**
     * Construct a Margin instance with left, top, right and bottom margins.
     *@param l Left margin in float.
     *@param t Top margin in float.
     *@param r Right margin in float.
     *@param b Bottom margin in float.
     */
    Margin(float l, float t, float r, float b);

    /**
     * Copy constructor.
     */
    Margin(const Margin& other);

    /**
     * Copy assignment operator.
     */
    Margin& operator=(const Margin& other);

    /**
     * Change margin with left, top, right and bottom margin.
     *@param l Left margin in float.
     *@param t Top margin in float.
     *@param r Right margin in float.
     *@param b Bottom margin in float.
     */
    void setMargin(float l, float t, float r, float b);

    /**
     * Test equality of two margins.
     *@param target A Margin instance.
     *@return True if two margins are equal, false otherwise.
     */
    bool equals(const Margin& target) const;

    /**
     * A margin constant with all margins equal zero.
     */
    static const Margin ZERO;
};

/**
 *@brief Base class for various LayoutParameter.
 */
class CC_GUI_DLL LayoutParameter : public Ref
{
public:
    /**
     *Layout parameter type.
     * There are mainly two types:
     * - Linear: Elements will  be arranged by margin.
     * - Relative: Elements will be arranged by margin and relative widget name.
     */
    enum class Type
    {
        NONE = 0,
        LINEAR,
        RELATIVE
    };
    /**
     * Default constructor.
     *
     * @lua new
     */
    LayoutParameter() : _margin(Margin()) { _layoutParameterType = Type::NONE; }

    /**
     * Default destructor.
     * @lua NA
     */
    virtual ~LayoutParameter(){};

    /**
     * Create a empty LayoutParameter.
     * @return A autorelease LayoutParameter instance.
     */
    static LayoutParameter* create();

    /**
     * Set margin parameter for LayoutParameter.
     *
     * @see Margin
     * @param margin
     */
    void setMargin(const Margin& margin);

    /**
     * Gets margin parameter of LayoutParameter.
     *
     * @see Margin
     * @return Margin of layout parameter.
     */
    const Margin& getMargin() const;

    /**
     * Gets LayoutParameterType of LayoutParameter.
     *
     * @see LayoutParameterType.
     * @return LayoutParameterType
     */
    Type getLayoutType() const;

    /**
     * Create a copy of original LayoutParameter.
     *@return A LayoutParameter pointer.
     */
    LayoutParameter* clone();

    /**
     * Create a cloned instance of LayoutParameter.
     *@return A LayoutParameter pointer.
     */
    virtual LayoutParameter* createCloneInstance();

    /**
     * Copy all the member field from argument LayoutParameter to self.
     *@param model A LayoutParameter instance.
     */
    virtual void copyProperties(LayoutParameter* model);

protected:
    Margin _margin;
    Type _layoutParameterType;
};

/**
 * Protocol for getting a LayoutParameter.
 * Every element want to have layout parameter should inherit from this class.
 */
class CC_GUI_DLL LayoutParameterProtocol
{
public:
    /**
     * Default destructor.
     */
    virtual ~LayoutParameterProtocol() {}

    /**
     *
     *@return A LayoutParameter and its descendant pointer.
     */
    virtual LayoutParameter* getLayoutParameter() const = 0;
};

/**
 * @brief Linear layout parameter.
 * It is used by linear layout manager for arranging elements linearly.
 */
class CC_GUI_DLL LinearLayoutParameter : public LayoutParameter
{
public:
    /**
     * Linear gravity.
     */
    enum class LinearGravity
    {
        NONE,
        LEFT,
        TOP,
        RIGHT,
        BOTTOM,
        CENTER_VERTICAL,
        CENTER_HORIZONTAL
    };

    /**
     * Default constructor.
     *
     * @lua new
     */
    LinearLayoutParameter() : _linearGravity(LinearGravity::NONE) { _layoutParameterType = Type::LINEAR; }

    /**
     * Default destructor.
     *
     * @lua NA
     */
    virtual ~LinearLayoutParameter(){};

    /**
     * Create a empty LinearLayoutParameter instance.
     * @return A initialized LayoutParameter which is marked as "autorelease".
     */
    static LinearLayoutParameter* create();

    /**
     * Sets LinearGravity parameter for LayoutParameter.
     *
     * @see LinearGravity
     * @param gravity Gravity in LinearGravity.
     */
    void setGravity(LinearGravity gravity);

    /**
     * Gets LinearGravity parameter for LayoutParameter.
     *
     * @see LinearGravity
     * @return LinearGravity
     */
    LinearGravity getGravity() const;

    // override functions.
    virtual LayoutParameter* createCloneInstance() override;
    virtual void copyProperties(LayoutParameter* model) override;

protected:
    LinearGravity _linearGravity;
    int i;
};

/**
 * @brief Relative layout parameter.
 * It is mainly used by  `RelativeLayoutManager`.
 */
class CC_GUI_DLL RelativeLayoutParameter : public LayoutParameter
{
public:
    /**
     * Relative Alignment type
     */
    enum class RelativeAlign
    {
        NONE,
        PARENT_TOP_LEFT,
        PARENT_TOP_CENTER_HORIZONTAL,
        PARENT_TOP_RIGHT,
        PARENT_LEFT_CENTER_VERTICAL,

        CENTER_IN_PARENT,

        PARENT_RIGHT_CENTER_VERTICAL,
        PARENT_LEFT_BOTTOM,
        PARENT_BOTTOM_CENTER_HORIZONTAL,
        PARENT_RIGHT_BOTTOM,

        LOCATION_ABOVE_LEFTALIGN,
        LOCATION_ABOVE_CENTER,
        LOCATION_ABOVE_RIGHTALIGN,
        LOCATION_LEFT_OF_TOPALIGN,
        LOCATION_LEFT_OF_CENTER,
        LOCATION_LEFT_OF_BOTTOMALIGN,
        LOCATION_RIGHT_OF_TOPALIGN,
        LOCATION_RIGHT_OF_CENTER,
        LOCATION_RIGHT_OF_BOTTOMALIGN,
        LOCATION_BELOW_LEFTALIGN,
        LOCATION_BELOW_CENTER,
        LOCATION_BELOW_RIGHTALIGN
    };

    /**
     * Default constructor
     *
     * @lua new
     */
    RelativeLayoutParameter()
        : _relativeAlign(RelativeAlign::NONE), _relativeWidgetName(""), _relativeLayoutName(""), _put(false)
    {
        _layoutParameterType = Type::RELATIVE;
    }

    /**
     * Default destructor
     *
     * @lua NA
     */
    virtual ~RelativeLayoutParameter(){};

    /**
     * Create a RelativeLayoutParameter instance.
     * @return A initialized LayoutParameter which is marked as "autorelease".
     */
    static RelativeLayoutParameter* create();

    /**
     * Sets RelativeAlign parameter for LayoutParameter.
     *
     * @see RelativeAlign
     * @param align Relative align in  `RelativeAlign`.
     */
    void setAlign(RelativeAlign align);

    /**
     * Get RelativeAlign parameter for LayoutParameter.
     *
     * @see RelativeAlign
     * @return  A RelativeAlign variable.
     */
    RelativeAlign getAlign() const;

    /**
     * Set widget name your widget want to relative to.
     *
     * @param name Relative widget name.
     */
    void setRelativeToWidgetName(const std::string& name);

    /**
     * Get the relative widget name.
     * @return name A relative widget name in string.
     */
    const std::string& getRelativeToWidgetName() const;

    /**
     * Set a name for LayoutParameter in Relative Layout.
     *
     * @param name A string name.
     */
    void setRelativeName(const std::string& name);

    /**
     * Get a name of LayoutParameter in Relative Layout.
     *
     * @return name Relative name in string.
     */
    const std::string& getRelativeName() const;

    // override functions.
    virtual LayoutParameter* createCloneInstance() override;
    virtual void copyProperties(LayoutParameter* model) override;

protected:
    RelativeAlign _relativeAlign;
    std::string _relativeWidgetName;
    std::string _relativeLayoutName;
    bool _put;
    friend class RelativeLayoutManager;
};

}  // namespace ui
NS_CC_END
// end of ui group
/// @}

#endif /* defined(__LayoutParameter__) */