// -*- C++ -*-
/**
 * \file BufferView.h
 * This file is part of LyX, the document processor.
 * Licence details can be found in the file COPYING.
 *
 * \author Alfredo Braustein
 * \author Lars Gullik Bjønnes
 * \author John Levon
 * \author Jürgen Vigna
 *
 * Full author contact details are available in file CREDITS.
 */

#ifndef BUFFER_VIEW_H
#define BUFFER_VIEW_H

#include <boost/utility.hpp>

#include <string>

class Buffer;
class Change;
class CursorSlice;
class Encoding;
class ErrorList;
class FuncRequest;
class InsetOld;
class Language;
class LCursor;
class LyXText;
class LyXScreen;
class LyXView;
class Painter;
class PosIterator;
class Selection;
class TeXErrors;
class UpdatableInset;


// The structure that keeps track of the selections set.
struct Selection {
	Selection()
		: set_(false), mark_(false)
		{}
	bool set() const {
		return set_;
	}
	void set(bool s) {
		set_ = s;
	}
	bool mark() const {
		return mark_;
	}
	void mark(bool m) {
		mark_ = m;
	}
private:
	bool set_; // former selection
	bool mark_; // former mark_set
};

/**
 * A buffer view encapsulates a view onto a particular
 * buffer, and allows access to operate upon it. A view
 * is a sliding window of the entire document rendering.
 *
 * Eventually we will allow several views onto a single
 * buffer, but not yet.
 */
class BufferView : boost::noncopyable {
public:
	/**
	 * Create a view with the given owner main window,
	 * of the given dimensions.
	 */
	BufferView(LyXView * owner, int x, int y, int w, int h);

	~BufferView();

	/// set the buffer we are viewing
	void buffer(Buffer * b);
	/// return the buffer being viewed
	Buffer * buffer() const;

	/// return the painter object for drawing onto the view
	Painter & painter() const;
	/// return the screen object for handling re-drawing
	LyXScreen & screen() const;
	/// return the owning main view
	LyXView * owner() const;

	/// return the visible top y
	int top_y() const;

	/// set the visible top y
	void top_y(int);

	/// resize event has happened
	void resize();

	/// reload the contained buffer
	void reload();
	/// create a new buffer based on template
	bool newFile(std::string const & fname, std::string const & tname,
		     bool named = true);
	/// load a buffer into the view
	bool loadLyXFile(std::string const & name, bool tolastfiles = true);

	/// fit the user cursor within the visible view
	bool fitCursor();
	/// perform pending painting updates
	void update();
	/// reset the scrollbar to reflect current view position
	void updateScrollbar();
	/// FIXME
	void redoCurrentBuffer();

	/// FIXME
	bool available() const;

	/// Save the current position as bookmark i
	void savePosition(unsigned int i);
	/// Restore the position from bookmark i
	void restorePosition(unsigned int i);
	/// does the given bookmark have a saved position ?
	bool isSavedPosition(unsigned int i);

	/// return the current change at the cursor
	Change const getCurrentChange();

	/// return the lyxtext we are using
	LyXText * getLyXText() const;

	/// update paragraph dialogs
	void updateParagraphDialog();

	/// return the current encoding at the cursor
	Encoding const * getEncoding() const;

	/// return the parent language of the given inset
	Language const * getParentLanguage(InsetOld * inset) const;

	/// replace the currently selected word
	void replaceWord(std::string const & replacestring);
	/// simple replacing. Use the font of the first selected character 
	void replaceSelectionWithString(std::string const & str);

	/// move cursor to the named label
	void gotoLabel(std::string const & label);

	/// undo last action
	void undo();
	/// redo last action
	void redo();

	/// get the stored error list
	ErrorList const & getErrorList() const;
	/// show the error list to the user
	void showErrorList(std::string const &) const;
	/// set the cursor based on the given TeX source row
	void setCursorFromRow(int row);

	/**
	 * Insert an inset into the buffer.
	 * Place it in a layout of lout,
	 */
	bool insertInset(InsetOld * inset, std::string const & lout = std::string());

	/// Inserts a lyx file at cursor position. return false if it fails
	bool insertLyXFile(std::string const & file);

	/// FIXME
	bool fitLockedInsetCursor(int x, int y, int asc, int desc);

	/// hide the cursor if it is visible
	void hideCursor();

	/// center the document view around the cursor
	void center();
	/// scroll document by the given number of lines of default height
	void scroll(int lines);
	/// Scroll the view by a number of pixels
	void scrollDocView(int);

	/// return the pixel width of the document view
	int workWidth() const;
	/// return the pixel height of the document view
	int workHeight() const;

	/// switch between primary and secondary keymaps for RTL entry
	void switchKeyMap();

	/// FIXME
	bool ChangeRefsIfUnique(std::string const & from, std::string const & to);

	/// get the contents of the window system clipboard
	std::string const getClipboard() const;
	/// fill the window system clipboard
	void stuffClipboard(std::string const &) const;
	/// tell the window system we have a selection
	void haveSelection(bool sel);

	/// execute the given function
	bool dispatch(FuncRequest const & argument);
	
	/// set target x position of cursor
	void x_target(int x);
	/// return target x position of cursor
	int x_target() const;

	/// clear the X selection
	void unsetXSel();

	/// access to full cursor
	LCursor & fullCursor();
	/// access to full cursor
	void fullCursor(LCursor const &);
	/// access to full cursor
	LCursor const & fullCursor() const;
	/// access to topmost cursor slice
	CursorSlice & cursor();
	/// access to topmost cursor slice
	CursorSlice const & cursor() const;
	/// access to selection anchor
	CursorSlice & anchor();
	/// access to selection anchor
	CursorSlice const & anchor() const;
	///
	UpdatableInset * innerInset() const;
	///
	LyXText * text() const;
	/// 
	void resetAnchor();
	///
	Selection & selection();
	///
	Selection const & selection() const;
	///
	CursorSlice & selStart();
	///
	CursorSlice const & selStart() const;
	///
	CursorSlice & selEnd();
	///
	CursorSlice const & selEnd() const;
	///
	void setSelection();
	///
	void clearSelection();
	///
	void putSelectionAt(PosIterator const & cur, int length, bool backwards);

	///
	Selection selection_;

private:
	///
	struct Pimpl;
	///
	friend struct BufferView::Pimpl;
	///
	Pimpl * pimpl_;

	/**
	 * The target x position of the cursor. This is used for when
	 * we have text like :
	 *
	 * blah blah blah blah| blah blah blah
	 * blah blah blah
	 * blah blah blah blah blah blah
	 *
	 * When we move onto row 3, we would like to be vertically aligned
	 * with where we were in row 1, despite the fact that row 2 is
	 * shorter than x()
	 */
	int x_target_;

};

#endif // BUFFERVIEW_H