/**
 * $Id: cairodocument.h 2 2009-10-31 02:48:23Z l0728348 $
 *
 * Copyright 2009
 *
 * @author Manuel Mausz (0728348)
 * @brief  implements some classes to better use cairomm.
 *         however, the design is however crappy.
 *         maybe try using papyrus.
 */

#ifndef CAIRODOCUMENT_H
#define CAIRODOCUMENT_H

#include <string>
#include <sstream>
#include <list>
#include <cairomm/cairomm.h>

/* forward declerations */
class CairoObject;
class CairoFont;
class CairoColor;
class CairoRectangle;
class CairoTextBox;
class CairoDocument;

/**
 * abstract class for all classes of this file
 * design: every object can contain other objects, which will
 * get applied before applying the actual object
 */
class CairoObject
{
  public:
    /** objectlist to contain */
    typedef std::list<CairoObject *> CairoObjectList;

    /**
     * @brief  Default dtor. virtual
     */
    virtual ~CairoObject()
    {}

    /**
     * @brief  adds another CairoObject to this CairoObject
     * @param  obj reference to the CairoObject to add
     * @return reference to this object
     */
    CairoObject& add(CairoObject& obj)
    {
      if (&obj != this)
        m_objects.push_back(&obj);
      return *this;
    }

    /**
     * @brief  adds another CairoObject to this CairoObject
     * @param  obj reference to the CairoObject to add
     * @return reference to this object
     */
    CairoObject& operator()(CairoObject& obj)
    {
      return add(obj);
    }

    /**
     * @brief  applys this CairoObject to the current context
     *         all containing objects will be applied before
     * @param  context cairomm context
     */
    void apply(const Cairo::RefPtr<Cairo::Context> context);

    /**
     * @brief  prepares this object for applying
     *         will be called be applyObject()
     * @param  context cairomm context
     */
    virtual void prepareObject(const Cairo::RefPtr<Cairo::Context> context)
    {}

    /**
     * @brief  applies this object to the current context
     * @param  context cairomm context
     */
    virtual void applyObject(const Cairo::RefPtr<Cairo::Context> context) = 0;

  protected:
    /** list of cairoobjects in this cairoobject */
    CairoObjectList m_objects;
};

/*----------------------------------------------------------------------------*/

/**
 * represents a font in cairomm
 */
class CairoFont
: public CairoObject
{
  public:
    /**
     * @brief  Default dtor
     * @param  size fontsize
     * @param  family fontfamily
     * @param  slant type of slant
     * @param  weight font weight
     */
    CairoFont(const double size, const std::string& family, Cairo::FontSlant slant = Cairo::FONT_SLANT_NORMAL,
        Cairo::FontWeight weight = Cairo::FONT_WEIGHT_NORMAL)
      : m_size(size), m_family(family), m_slant(slant), m_weight(weight), m_height(-1)
    {}

    /**
     * Default dtor
     */
    ~CairoFont()
    {}

    /**
     * @brief  get height of current object
     * @return height of current object
     */
    double height();

    /**
     * @brief  applies this object to the current context
     * @param  context cairomm context
     */
    void applyObject(const Cairo::RefPtr<Cairo::Context> context);

  private:
    double m_size;
    std::string m_family;
    Cairo::FontSlant m_slant;
    Cairo::FontWeight m_weight;
    double m_height;
};

/*----------------------------------------------------------------------------*/

/**
 * represents a color in cairomm
 */
class CairoColor
: public CairoObject
{
  public:
    /**
     * @brief  Default dtor
     * @param  red value for red part (0 to 1)
     * @param  green value for green part (0 to 1)
     * @param  blue value for blue part (0 to 1)
     * @param  alpha value for alpha (0 to 1)
     */
    CairoColor(const double red = 0.0, const double green = 0.0, const double blue = 0.0,
        const double alpha = 1.0)
      : m_red(red), m_green(green), m_blue(blue), m_alpha(alpha)
    {}

    /**
     * Default dtor
     */
    ~CairoColor()
    {}

    /**
     * @brief  applies this object to the current context
     * @param  context cairomm context
     */
    void applyObject(const Cairo::RefPtr<Cairo::Context> context);

  private:
    double m_red, m_green, m_blue;
    double m_alpha;
};

/*----------------------------------------------------------------------------*/

/**
 * creates a rectangle in cairomm
 */
class CairoRectangle
: public CairoObject
{
  public:
    /**
     * @brief  Default dtor
     * @param  x x-coordinates to start
     * @param  y y-coordinates to start
     * @param  width rectangle width
     * @param  height rectangle height
     * @param  linewidth linewidth for rectangle
     */
    CairoRectangle(const double x, const double y, const double width, const double height,
        const double linewidth = 0.2)
      : m_x(x), m_y(y), m_width(width), m_height(height), m_linewidth(linewidth)
    {}

    /**
     * Default dtor
     */
    CairoRectangle()
    {}

    /**
     * @brief  get x-coordinate of current object
     * @return x-coordinate of current object
     */
    double x()
    {
      return m_x;
    }

    /**
     * @brief  get y-coordinate of current object
     * @return y-coordinate of current object
     */
    double y()
    {
      return m_y;
    }

    /**
     * @brief  get height of current object
     * @return height of current object
     */
    double height()
    {
      return m_height;
    }

    /**
     * @brief  get width of current object
     * @return width of current object
     */
    double width()
    {
      return m_width;
    }

    /**
     * @brief  applies this object to the current context
     * @param  context cairomm context
     */
    void applyObject(const Cairo::RefPtr<Cairo::Context> context);

  private:
    double m_x, m_y;
    double m_width, m_height;
    double m_linewidth;
};

/*----------------------------------------------------------------------------*/

/**
 * creates a textbox using cairomm
 */
class CairoTextBox
: public CairoObject
{
  public:
    /**
     * @brief  Default dtor
     * @param  x x-coordinates to start
     * @param  y y-coordinates to start
     * @param  width rectangle width
     * @param  height rectangle height
     * @param  padding padding for textbox
     */
    CairoTextBox(const double x, const double y, const double width, const double height,
        const double padding = 0)
      : m_x(x), m_y(y), m_width(width), m_height(height), m_padding(padding), m_text("")
    {}

    /**
     * Default dtor
     * deletes allocated rectangle objects for borders
     */
    ~CairoTextBox()
    {
      for(CairoRectangleList::iterator it = m_rectangles.begin(); it != m_rectangles.end(); ++it)
        delete *it;
    }

    /**
     * @brief  add text to this textbox
     * @param  text text to add
     */
    void addText(const std::string& text)
    {
      m_text << text;
    }

    /**
     * @brief  istream operator to add text to this textbox
     * @param  text text to add
     * @return reference to this object
     */
    CairoTextBox& operator<<(std::string text)
    {
      m_text << text;
      return *this;
    }

    /**
     * @brief  istream operator to add a integer to this textbox
     * @param  num integer to add
     * @return reference to this object
     */
    CairoTextBox& operator<<(int num)
    {
      m_text << num;
      return *this;
    }

    /**
     * @brief  adds border around this textbox
     *         using a dynamically allocated rectangle object
     * @param  linewidth linewidth for the border
     * @param  obj pointer to object which will be added to the
     *         dynamically allocated border
     * @return reference to this object
     */
    CairoTextBox& addBorder(const double linewidth = 0.2, CairoObject *obj = NULL);

    /**
     * @brief  get x-coordinate of current object
     * @return x-coordinate of current object
     */
    double x()
    {
      return m_x;
    }

    /**
     * @brief  get y-coordinate of current object
     * @return y-coordinate of current object
     */
    double y()
    {
      return m_y;
    }

    /**
     * @brief  get height of current object
     * @return height of current object
     */
    double height()
    {
      return m_height;
    }

    /**
     * @brief  get width of current object
     * @return width of current object
     */
    double width()
    {
      return m_width;
    }

    /**
     * @brief  get padding of current object
     * @return padding of current object
     */
    double padding()
    {
      return m_padding;
    }

    /**
     * @brief  applies this object to the current context
     * @param  context cairomm context
     */
    void applyObject(const Cairo::RefPtr<Cairo::Context> context);

  private:
    /** rectangelist for added borders */
    typedef std::list<CairoRectangle *> CairoRectangleList;

    double m_x, m_y;
    double m_width, m_height;
    double m_padding;
    std::stringstream m_text;
    CairoRectangleList m_rectangles;
};

/*----------------------------------------------------------------------------*/

/**
 * creates a document using cairomm
 */
class CairoDocument
: public CairoObject
{
  public:
    /** valid outout formats for the document */
    enum OutputFormat
    {
#ifdef CAIRO_HAS_PDF_SURFACE
      PDF,
#endif
    };

    /**
     * @brief  Default dtor
     * @param  width width of document
     * @param  height height of document
     */
    CairoDocument(const unsigned width, const unsigned height)
      : m_width(width), m_height(height)
    {}

    /**
     * Default dtor
     */
    ~CairoDocument()
    {}

    /**
     * @brief  applies this object to the current context
     * @param  context cairomm context
     */
    void applyObject(const Cairo::RefPtr<Cairo::Context> context)
    {}

    /**
     * @brief  generates and saves the current document
     * @param  filename filename for document
     * @param  format output format for document
     */
    bool save(const std::string& filename, const OutputFormat format);

    /**
     * @brief  get width of current object
     * @return width of current object
     */
    unsigned width()
    {
      return m_width;
    }

    /**
     * @brief  get height of current object
     * @return height of current object
     */
    unsigned height()
    {
      return m_height;
    }

  private:
    unsigned m_width, m_height;
};

#endif

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