/*
  ==============================================================================

   This file is part of the JUCE 6 technical preview.
   Copyright (c) 2017 - ROLI Ltd.

   You may use this code under the terms of the GPL v3
   (see www.gnu.org/licenses).

   For this technical preview, this file is not subject to commercial licensing.

   JUCE IS PROVIDED "AS IS" WITHOUT ANY WARRANTY, AND ALL WARRANTIES, WHETHER
   EXPRESSED OR IMPLIED, INCLUDING MERCHANTABILITY AND FITNESS FOR PURPOSE, ARE
   DISCLAIMED.

  ==============================================================================
*/

namespace juce
{

//==============================================================================
/**
    A path object that consists of RelativePoint coordinates rather than the normal fixed ones.

    One of these paths can be converted into a Path object for drawing and manipulation, but
    unlike a Path, its points can be dynamic instead of just fixed.

    @see RelativePoint, RelativeCoordinate

    @tags{GUI}
*/
class JUCE_API  RelativePointPath
{
public:
    //==============================================================================
    RelativePointPath();
    RelativePointPath (const RelativePointPath&);
    explicit RelativePointPath (const Path& path);
    ~RelativePointPath();

    bool operator== (const RelativePointPath&) const noexcept;
    bool operator!= (const RelativePointPath&) const noexcept;

    //==============================================================================
    /** Resolves this points in this path and adds them to a normal Path object. */
    void createPath (Path& path, Expression::Scope* scope) const;

    /** Returns true if the path contains any non-fixed points. */
    bool containsAnyDynamicPoints() const;

    /** Quickly swaps the contents of this path with another. */
    void swapWith (RelativePointPath&) noexcept;

    //==============================================================================
    /** The types of element that may be contained in this path.
        @see RelativePointPath::ElementBase
    */
    enum ElementType
    {
        nullElement,
        startSubPathElement,
        closeSubPathElement,
        lineToElement,
        quadraticToElement,
        cubicToElement
    };

    //==============================================================================
    /** Base class for the elements that make up a RelativePointPath.
    */
    class JUCE_API  ElementBase
    {
    public:
        ElementBase (ElementType type);
        virtual ~ElementBase() = default;
        virtual void addToPath (Path& path, Expression::Scope*) const = 0;
        virtual RelativePoint* getControlPoints (int& numPoints) = 0;
        virtual ElementBase* clone() const = 0;
        bool isDynamic();

        const ElementType type;

    private:
        JUCE_DECLARE_NON_COPYABLE (ElementBase)
    };

    //==============================================================================
    /** Class for the start sub path element */
    class JUCE_API  StartSubPath  : public ElementBase
    {
    public:
        StartSubPath (const RelativePoint& pos);
        void addToPath (Path& path, Expression::Scope*) const override;
        RelativePoint* getControlPoints (int& numPoints) override;
        ElementBase* clone() const override;

        RelativePoint startPos;

    private:
        JUCE_DECLARE_NON_COPYABLE (StartSubPath)
    };

    //==============================================================================
    /** Class for the close sub path element */
    class JUCE_API  CloseSubPath  : public ElementBase
    {
    public:
        CloseSubPath();
        void addToPath (Path& path, Expression::Scope*) const override;
        RelativePoint* getControlPoints (int& numPoints) override;
        ElementBase* clone() const override;

    private:
        JUCE_DECLARE_NON_COPYABLE (CloseSubPath)
    };

    //==============================================================================
    /** Class for the line to element */
    class JUCE_API  LineTo  : public ElementBase
    {
    public:
        LineTo (const RelativePoint& endPoint);
        void addToPath (Path& path, Expression::Scope*) const override;
        RelativePoint* getControlPoints (int& numPoints) override;
        ElementBase* clone() const override;

        RelativePoint endPoint;

    private:
        JUCE_DECLARE_NON_COPYABLE (LineTo)
    };

    //==============================================================================
    /** Class for the quadratic to element */
    class JUCE_API  QuadraticTo  : public ElementBase
    {
    public:
        QuadraticTo (const RelativePoint& controlPoint, const RelativePoint& endPoint);
        ValueTree createTree() const;
        void addToPath (Path& path, Expression::Scope*) const override;
        RelativePoint* getControlPoints (int& numPoints) override;
        ElementBase* clone() const override;

        RelativePoint controlPoints[2];

    private:
        JUCE_DECLARE_NON_COPYABLE (QuadraticTo)
    };

    //==============================================================================
    /** Class for the cubic to element */
    class JUCE_API  CubicTo  : public ElementBase
    {
    public:
        CubicTo (const RelativePoint& controlPoint1, const RelativePoint& controlPoint2, const RelativePoint& endPoint);
        ValueTree createTree() const;
        void addToPath (Path& path, Expression::Scope*) const override;
        RelativePoint* getControlPoints (int& numPoints) override;
        ElementBase* clone() const override;

        RelativePoint controlPoints[3];

    private:
        JUCE_DECLARE_NON_COPYABLE (CubicTo)
    };

    //==============================================================================
    void addElement (ElementBase* newElement);

    //==============================================================================
    OwnedArray<ElementBase> elements;
    bool usesNonZeroWinding;

private:
    class Positioner;
    friend class Positioner;
    bool containsDynamicPoints;

    void applyTo (DrawablePath& path) const;

    RelativePointPath& operator= (const RelativePointPath&);
    JUCE_LEAK_DETECTOR (RelativePointPath)
};

} // namespace juce