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/*
 *  LDForge: LDraw parts authoring CAD
 *  Copyright (C) 2013, 2014 Santeri Piippo
 *
 *  This program is free software: you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation, either version 3 of the License, or
 *  (at your option) any later version.
 *
 *  This program 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 General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

#pragma once
#include <type_traits>
#include "main.h"
#include "basics.h"
#include "misc/documentPointer.h"
#include "glShared.h"

#define LDOBJ(T)												\
public:															\
	virtual LDObject::Type type() const override				\
	{															\
		return LDObject::E##T;									\
	}															\
	virtual String asText() const override;						\
	virtual void invert() override;								\
																\
	LD##T (LDObjectPtr* selfptr);								\
																\
protected:														\
	friend class QSharedPointer<LD##T>::ExternalRefCount;		\

#define LDOBJ_NAME(N)          public: virtual String typeName() const override { return #N; }
#define LDOBJ_VERTICES(V)      public: virtual int numVertices() const override { return V; }
#define LDOBJ_SETCOLORED(V)    public: virtual bool isColored() const override { return V; }
#define LDOBJ_COLORED          LDOBJ_SETCOLORED (true)
#define LDOBJ_UNCOLORED        LDOBJ_SETCOLORED (false)

#define LDOBJ_CUSTOM_SCEMANTIC public: virtual bool isScemantic() const override
#define LDOBJ_SCEMANTIC        LDOBJ_CUSTOM_SCEMANTIC { return true; }
#define LDOBJ_NON_SCEMANTIC    LDOBJ_CUSTOM_SCEMANTIC { return false; }

#define LDOBJ_SETMATRIX(V)     public: virtual bool hasMatrix() const override { return V; }
#define LDOBJ_HAS_MATRIX       LDOBJ_SETMATRIX (true)
#define LDOBJ_NO_MATRIX        LDOBJ_SETMATRIX (false)

class QListWidgetItem;
class LDSubfile;
class LDDocument;
class LDSharedVertex;

class LDBFC;
using LDBFCPtr = QSharedPointer<LDBFC>;

// =============================================================================
// LDObject
//
// Base class object for all object types. Each LDObject represents a single line
// in the LDraw code file. The virtual method getType returns an enumerator
// which is a token of the object's type. The object can be casted into
// sub-classes based on this enumerator.
// =============================================================================
class LDObject
{
	PROPERTY (public,		bool,				isHidden,		setHidden,		STOCK_WRITE)
	PROPERTY (public,		bool,				isSelected,		setSelected,	STOCK_WRITE)
	PROPERTY (public,		bool,				isDestructed,	setDestructed,	STOCK_WRITE)
	PROPERTY (public,		LDObjectWeakPtr,	parent,			setParent,		STOCK_WRITE)
	PROPERTY (public,		LDDocument*,		document,		setDocument,	STOCK_WRITE)
	PROPERTY (private,		int32,				id,				setID,			STOCK_WRITE)
	PROPERTY (public,		int,				color,			setColor,		CUSTOM_WRITE)
	PROPERTY (private,		QColor,				randomColor,	setRandomColor,	STOCK_WRITE)
	PROPERTY (private,		LDObjectWeakPtr,	self,			setSelf,		STOCK_WRITE)

	public:
		// Object type codes.
		enum Type
		{
			ESubfile,        // Object represents a sub-file reference
			EQuad,           // Object represents a quadrilateral
			ETriangle,       // Object represents a triangle
			ELine,           // Object represents a line
			ECondLine,       // Object represents a conditional line
			EVertex,         // Object is a vertex, LDForge extension object
			EBFC,            // Object represents a BFC statement
			EOverlay,        // Object contains meta-info about an overlay image.
			EComment,        // Object represents a comment
			EError,          // Object is the result of failed parsing
			EEmpty,          // Object represents an empty line
			EUnidentified,   // Unknown object type (some functions return this; TODO: they probably should not)

			ENumTypes,       // Amount of object types
			EFirstType = ESubfile
		};

		LDObject (LDObjectPtr* selfptr);

		// This object as LDraw code
		virtual String				asText() const = 0;

		// Makes a copy of this object
		LDObjectPtr					createCopy() const;

		// Deletes this object
		void						destroy();

		// Removes this object from selection
		void						deselect();

		// Does this object have a matrix and position? (see LDMatrixObject)
		virtual bool				hasMatrix() const = 0;

		// Inverts this object (winding is reversed)
		virtual void				invert() = 0;

		// Is this object colored?
		virtual bool				isColored() const = 0;

		// Does this object have meaning in the part model?
		virtual bool				isScemantic() const = 0;

		// Index (i.e. line number) of this object
		long						lineNumber() const;

		// Moves this object using the given vertex as a movement List
		void						move (Vertex vect);

		// Object after this in the current file
		LDObjectPtr					next() const;

		// Number of vertices this object has
		virtual int					numVertices() const = 0;

		// Object prior to this in the current file
		LDObjectPtr					previous() const;

		// Is the previous object INVERTNEXT?
		bool						previousIsInvertnext (LDBFCPtr& ptr);

		// Replace this LDObject with another LDObject. Object is deleted in the process.
		void						replace (LDObjectPtr other);

		// Selects this object.
		void						select();

		// Set a vertex to the given value
		void						setVertex (int i, const Vertex& vert);

		// Set a single coordinate of a vertex
		void						setVertexCoord (int i, Axis ax, double value);

		// Swap this object with another.
		void						swap (LDObjectPtr other);

		// What object in the current file ultimately references this?
		LDObjectPtr					topLevelParent();

		// Type enumerator of this object
		virtual Type				type() const = 0;

		// Type name of this object
		virtual String				typeName() const = 0;

		// Get a vertex by index
		const Vertex&				vertex (int i) const;

		// Get type name by enumerator
		static String typeName (LDObject::Type type);

		// Returns a default-constructed LDObject by the given type
		static LDObjectPtr getDefault (const LDObject::Type type);

		// TODO: move this to LDDocument?
		static void moveObjects (LDObjectList objs, const bool up);

		// Get a description of a list of LDObjects
		static String describeObjects (const LDObjectList& objs);
		static LDObjectPtr fromID (int id);
		LDPolygon* getPolygon();

		// TODO: make this private!
		QListWidgetItem* qObjListEntry;

		// This is public because I cannot protect it as the lambda deletor would
		// have to be the friend. Do not call this! Ever!
		void finalDelete();

	protected:
		// LDObjects are to be deleted with the finalDelete() method, not with
		// operator delete. This is because it seems virtual functions cannot
		// be properly called from the destructor, thus a normal method must
		// be used instead. The destructor also doesn't seem to be able to
		// be private without causing a truckload of problems so it's protected
		// instead.
		virtual ~LDObject();
		void chooseID();

		// Even though we supply a custom deleter to QSharedPointer, the shared
		// pointer's base class still calls operator delete directly in one of
		// its methods. The method should never be called but we need to declare
		// the class making this delete call a friend anyway.
		friend class QSharedPointer<LDObject>;
		friend class QSharedPointer<LDObject>::ExternalRefCount;

	private:
		LDSharedVertex*	m_coords[4];
};

//
// Makes a new LDObject. This makes the shared pointer always use the custom
// deleter so that all deletions go through finalDelete();
//
template<typename T, typename... Args>
inline QSharedPointer<T> spawn (Args... args)
{
	static_assert (std::is_base_of<LDObject, T>::value, "spawn may only be used with LDObject-derivatives");
	LDObjectPtr ptr;
	new T (&ptr, args...);
	return ptr.staticCast<T>();
}

NUMERIC_ENUM_OPERATORS (LDObject::Type)

//
// Apparently QWeakPointer doesn't implement operator<. This is a problem when
// some of the code needs to sort and remove duplicates from LDObject lists.
// Adding a specialized version here:
//
inline bool operator< (LDObjectWeakPtr a, LDObjectWeakPtr b)
{
	return a.data() < b.data();
}

// =============================================================================
// LDSharedVertex
//
// For use as coordinates of LDObjects. Keeps count of references.
// =============================================================================
class LDSharedVertex
{
	public:
		inline const Vertex& data() const
		{
			return m_data;
		}

		inline operator const Vertex&() const
		{
			return m_data;
		}

		void addRef (LDObjectPtr a);
		void delRef (LDObjectPtr a);

		static LDSharedVertex* getSharedVertex (const Vertex& a);

	protected:
		LDSharedVertex (const Vertex& a) : m_data (a) {}

	private:
		LDObjectList m_refs;
		Vertex m_data;
};

// =============================================================================
//
// Common code for objects with matrices. This class is multiple-derived in
// and thus not used directly other than as a common storage point for matrices
// and vertices.
//
// The link pointer is a pointer to this object's LDObject self - since this is
// multiple-derived in, static_cast or dynamic_cast won't budge here.
//
// In 0.1-alpha, there was a separate 'radial' type which had a position and
// matrix as well. Even though right now only LDSubfile uses this, I'm keeping
// this class distinct in case I get new extension ideas. :)
//
class LDMatrixObject
{
	PROPERTY (public,	LDObjectWeakPtr,	linkPointer,	setLinkPointer,	STOCK_WRITE)
	PROPERTY (public,	Matrix,				transform,		setTransform,	CUSTOM_WRITE)

	public:
		LDMatrixObject() :
			m_position (LDSharedVertex::getSharedVertex (g_origin)) {}

		LDMatrixObject (const Matrix& transform, const Vertex& pos) :
			m_transform (transform),
			m_position (LDSharedVertex::getSharedVertex (pos)) {}

		inline const Vertex& position() const
		{
			return m_position->data();
		}

		void setCoordinate (const Axis ax, double value)
		{
			Vertex v = position();

			switch (ax)
			{
				case X: v.setX (value); break;
				case Y: v.setY (value); break;
				case Z: v.setZ (value); break;
			}

			setPosition (v);
		}

		void setPosition (const Vertex& a);

	private:
		LDSharedVertex*	m_position;
};

using LDMatrixObjectPtr = QSharedPointer<LDMatrixObject>;
using LDMatrixObjectWeakPtr = QWeakPointer<LDMatrixObject>;

// =============================================================================
//
// Represents a line in the LDraw file that could not be properly parsed. It is
// represented by a (!) ERROR in the code view. It exists for the purpose of
// allowing garbage lines be debugged and corrected within LDForge.
//
class LDError : public LDObject
{
	LDOBJ (Error)
	LDOBJ_NAME (error)
	LDOBJ_VERTICES (0)
	LDOBJ_UNCOLORED
	LDOBJ_SCEMANTIC
	LDOBJ_NO_MATRIX
	PROPERTY (public,	String,	fileReferenced, setFileReferenced,	STOCK_WRITE)
	PROPERTY (private,	String,	contents,		setContents,		STOCK_WRITE)
	PROPERTY (private,	String,	reason,			setReason,			STOCK_WRITE)

	public:
		LDError (LDObjectPtr* selfptr, String contents, String reason) :
			LDObject (selfptr),
			m_contents (contents),
			m_reason (reason) {}
};

using LDErrorPtr = QSharedPointer<LDError>;
using LDErrorWeakPtr = QWeakPointer<LDError>;

// =============================================================================
//
// Represents an empty line in the LDraw code file.
//
class LDEmpty : public LDObject
{
	LDOBJ (Empty)
	LDOBJ_NAME (empty)
	LDOBJ_VERTICES (0)
	LDOBJ_UNCOLORED
	LDOBJ_NON_SCEMANTIC
	LDOBJ_NO_MATRIX
};

using LDEmptyPtr = QSharedPointer<LDEmpty>;
using LDEmptyWeakPtr = QWeakPointer<LDEmpty>;

// =============================================================================
//
// Represents a code-0 comment in the LDraw code file.
//
class LDComment : public LDObject
{
	PROPERTY (public, String, text, setText, STOCK_WRITE)
	LDOBJ (Comment)
	LDOBJ_NAME (comment)
	LDOBJ_VERTICES (0)
	LDOBJ_UNCOLORED
	LDOBJ_NON_SCEMANTIC
	LDOBJ_NO_MATRIX

	public:
		LDComment (LDObjectPtr* selfptr, String text) :
			LDObject (selfptr),
			m_text (text) {}
};

using LDCommentPtr = QSharedPointer<LDComment>;
using LDCommentWeakPtr = QWeakPointer<LDComment>;

// =============================================================================
//
// Represents a 0 BFC statement in the LDraw code. eStatement contains the type
// of this statement.
//
class LDBFC : public LDObject
{
	public:
		enum Statement
		{
			CertifyCCW,
			CCW,
			CertifyCW,
			CW,
			NoCertify,
			InvertNext,
			Clip,
			ClipCCW,
			ClipCW,
			NoClip,
			NumStatements
		};

		LDOBJ (BFC)
		LDOBJ_NAME (bfc)
		LDOBJ_VERTICES (0)
		LDOBJ_UNCOLORED
		LDOBJ_CUSTOM_SCEMANTIC { return (statement() == InvertNext); }
		LDOBJ_NO_MATRIX
		PROPERTY (public, Statement, statement, setStatement, STOCK_WRITE)

	public:
		LDBFC (LDObjectPtr* selfptr, const LDBFC::Statement type) :
			LDObject (selfptr),
			m_statement (type) {}

		// Statement strings
		static const char* k_statementStrings[];
};

using LDBFCPtr = QSharedPointer<LDBFC>;
using LDBFCWeakPtr = QWeakPointer<LDBFC>;

// =============================================================================
// LDSubfile
//
// Represents a single code-1 subfile reference.
// =============================================================================
class LDSubfile : public LDObject, public LDMatrixObject
{
	LDOBJ (Subfile)
	LDOBJ_NAME (subfile)
	LDOBJ_VERTICES (0)
	LDOBJ_COLORED
	LDOBJ_SCEMANTIC
	LDOBJ_HAS_MATRIX
	PROPERTY (public, LDDocumentPointer, fileInfo, setFileInfo, CUSTOM_WRITE)

	public:
		enum InlineFlag
		{
			DeepInline     = (1 << 0),
			CacheInline    = (1 << 1),
			RendererInline = (1 << 2),
			DeepCacheInline = (DeepInline | CacheInline),
		};

		Q_DECLARE_FLAGS (InlineFlags, InlineFlag)

		// Inlines this subfile.
		LDObjectList inlineContents (bool deep, bool render);
		QList<LDPolygon> inlinePolygons();
};

Q_DECLARE_OPERATORS_FOR_FLAGS (LDSubfile::InlineFlags)
using LDSubfilePtr = QSharedPointer<LDSubfile>;
using LDSubfileWeakPtr = QWeakPointer<LDSubfile>;

// =============================================================================
// LDLine
//
// Represents a single code-2 line in the LDraw code file. v0 and v1 are the end
// points of the line. The line is colored with dColor unless uncolored mode is
// set.
// =============================================================================
class LDLine : public LDObject
{
	LDOBJ (Line)
	LDOBJ_NAME (line)
	LDOBJ_VERTICES (2)
	LDOBJ_COLORED
	LDOBJ_SCEMANTIC
	LDOBJ_NO_MATRIX

	public:
		LDLine (LDObjectPtr* selfptr, Vertex v1, Vertex v2);
};

using LDLinePtr = QSharedPointer<LDLine>;
using LDLineWeakPtr = QWeakPointer<LDLine>;

// =============================================================================
// LDCondLine
//
// Represents a single code-5 conditional line. The end-points v0 and v1 are
// inherited from LDLine, c0 and c1 are the control points of this line.
// =============================================================================
class LDCondLine : public LDLine
{
	LDOBJ (CondLine)
	LDOBJ_NAME (condline)
	LDOBJ_VERTICES (4)
	LDOBJ_COLORED
	LDOBJ_SCEMANTIC
	LDOBJ_NO_MATRIX

	public:
		LDCondLine (LDObjectPtr* selfptr, const Vertex& v0, const Vertex& v1,
					const Vertex& v2, const Vertex& v3);
		LDLinePtr demote();
};

using LDCondLinePtr = QSharedPointer<LDCondLine>;
using LDCondLineWeakPtr = QWeakPointer<LDCondLine>;

// =============================================================================
// LDTriangle
//
// Represents a single code-3 triangle in the LDraw code file. Vertices v0, v1
// and v2 contain the end-points of this triangle. dColor is the color the
// triangle is colored with.
// =============================================================================
class LDTriangle : public LDObject
{
	LDOBJ (Triangle)
	LDOBJ_NAME (triangle)
	LDOBJ_VERTICES (3)
	LDOBJ_COLORED
	LDOBJ_SCEMANTIC
	LDOBJ_NO_MATRIX

	public:
		LDTriangle (LDObjectPtr* selfptr, Vertex v0, Vertex v1, Vertex v2) :
			LDObject (selfptr)
		{
			setVertex (0, v0);
			setVertex (1, v1);
			setVertex (2, v2);
		}
};

using LDTrianglePtr = QSharedPointer<LDTriangle>;
using LDTriangleWeakPtr = QWeakPointer<LDTriangle>;

// =============================================================================
// LDQuad
//
// Represents a single code-4 quadrilateral. v0, v1, v2 and v3 are the end points
// of the quad, dColor is the color used for the quad.
// =============================================================================
class LDQuad : public LDObject
{
	LDOBJ (Quad)
	LDOBJ_NAME (quad)
	LDOBJ_VERTICES (4)
	LDOBJ_COLORED
	LDOBJ_SCEMANTIC
	LDOBJ_NO_MATRIX

	public:
		LDQuad (LDObjectPtr* selfptr, const Vertex& v0, const Vertex& v1,
				const Vertex& v2, const Vertex& v3);

		// Split this quad into two triangles (note: heap-allocated)
		QList<LDTrianglePtr> splitToTriangles();
};

using LDQuadPtr = QSharedPointer<LDQuad>;
using LDQuadWeakPtr = QWeakPointer<LDQuad>;

// =============================================================================
// LDVertex
//
// The vertex is an LDForce-specific extension which represents a single
// vertex which can be used as a parameter to tools or to store coordinates
// with. Vertices are a part authoring tool and they should not appear in
// finished parts.
// =============================================================================
class LDVertex : public LDObject
{
	LDOBJ (Vertex)
	LDOBJ_NAME (vertex)
	LDOBJ_VERTICES (0) // TODO: move pos to vaCoords[0]
	LDOBJ_COLORED
	LDOBJ_NON_SCEMANTIC
	LDOBJ_NO_MATRIX

	public:
		Vertex pos;
};

using LDVertexPtr = QSharedPointer<LDVertex>;
using LDVertexWeakPtr = QWeakPointer<LDVertex>;

// =============================================================================
// LDOverlay
//
// Overlay image meta, stored in the header of parts so as to preserve overlay
// information.
// =============================================================================
class LDOverlay : public LDObject
{
	LDOBJ (Overlay)
	LDOBJ_NAME (overlay)
	LDOBJ_VERTICES (0)
	LDOBJ_UNCOLORED
	LDOBJ_NON_SCEMANTIC
	LDOBJ_NO_MATRIX
	PROPERTY (public,	int,		camera,		setCamera,		STOCK_WRITE)
	PROPERTY (public,	int,		x,			setX,			STOCK_WRITE)
	PROPERTY (public,	int,		y,			setY,			STOCK_WRITE)
	PROPERTY (public,	int,		width,		setWidth,		STOCK_WRITE)
	PROPERTY (public,	int,		height,		setHeight,		STOCK_WRITE)
	PROPERTY (public,	String,		fileName,	setFileName,	STOCK_WRITE)
};

using LDOverlayPtr = QSharedPointer<LDOverlay>;
using LDOverlayWeakPtr = QWeakPointer<LDOverlay>;

// Other common LDraw stuff
static const String g_CALicense ("!LICENSE Redistributable under CCAL version 2.0 : see CAreadme.txt");
static const String g_nonCALicense ("!LICENSE Not redistributable : see NonCAreadme.txt");
static const int g_lores = 16;
static const int g_hires = 48;

String getLicenseText (int id);