// -*- C++ -*-
/* This file is part of
 * ======================================================
 *
 *           LyX, The Document Processor
 *
 *           Copyright 1995 Matthias Ettrich
 *           Copyright 1995-2001 The LyX Team.
 *
 * ====================================================== */

#ifndef LYXTEXT_H
#define LYXTEXT_H

#ifdef __GNUG__
#pragma interface
#endif

#include "lyxfont.h"
#include "lyxcursor.h"
#include "layout.h"
#include "LColor.h"
#include "insets/inset.h"
#include "WordLangTuple.h"

class Buffer;
class BufferParams;
class BufferView;
class InsetText;
class Paragraph;
class Row;
class Spacing;
class UpdatableInset;
class VSpace;


/**
  This class holds the mapping between buffer paragraphs and screen rows.
  */
class LyXText {
public:
	///
	enum text_status {
		///
		UNCHANGED = 0,
		///
		CHANGED_IN_DRAW = 1,
		///
		NEED_VERY_LITTLE_REFRESH = 2,
		///
		NEED_MORE_REFRESH = 3
	};
	///
	enum word_location {
		// the word around the cursor, only if the cursor is
		//not at a boundary
		WHOLE_WORD_STRICT,
		// the word around the cursor
		WHOLE_WORD,
		/// the word begining from the cursor position
		PARTIAL_WORD,
		/// the word around the cursor or before the cursor
		PREVIOUS_WORD,
		/// the next word (not yet used)
		NEXT_WORD
	};

	/// Constructor
	LyXText(BufferView *);
	///
	LyXText(InsetText *);

	/// Destructor
	~LyXText();

	void init(BufferView *, bool reinit = false);
	///
	mutable int number_of_rows;
	///
	mutable int height;
	///
	mutable unsigned int width;
	/// the current font settings
	mutable LyXFont current_font;
	/// the current font
	mutable LyXFont real_current_font;
	/// first visible pixel-row is set from LyXScreen!!!
	// unsigned is wrong here for text-insets!
	int first_y;
	///
	BufferView * bv_owner;
	///
	InsetText * inset_owner;
	///
	UpdatableInset * the_locking_inset;

	///
	int getRealCursorX(BufferView *) const;
	///
	LyXFont const getFont(Buffer const *, Paragraph * par,
		lyx::pos_type pos) const;
	///
	LyXFont const getLayoutFont(Buffer const *, Paragraph * par) const;
	///
	LyXFont const getLabelFont(Buffer const *, Paragraph * par) const;
	///
	void setCharFont(Buffer const *, Paragraph * par,
			 lyx::pos_type pos, LyXFont const & font);
	void setCharFont(BufferView *, Paragraph * par,
			 lyx::pos_type pos, LyXFont const & font, bool toggleall);

	/// what you expect when pressing <enter> at cursor position
	void breakParagraph(BufferView *, char keep_layout = 0);

	/** set layout over selection and make a total rebreak of
	  those paragraphs
	  */
	Paragraph * setLayout(BufferView *, LyXCursor & actual_cursor,
			      LyXCursor & selection_start,
			      LyXCursor & selection_end,
			      string const & layout);
	///
	void setLayout(BufferView *, string const & layout);

	/** increment depth over selection and make a total rebreak of those
	  paragraphs
	  */
	void incDepth(BufferView *);

	/** decrement depth over selection and make a total rebreak of those
	  paragraphs */
	void decDepth(BufferView *);

	/** Get the depth at current cursor position
	 */
	int getDepth() const;

	/** set font over selection and make a total rebreak of those
	  paragraphs.
	  toggleall defaults to false.
	  */
	void setFont(BufferView *, LyXFont const &, bool toggleall = false);

	/** deletes and inserts again all paragaphs between the cursor
	  and the specified par. The Cursor is needed to set the refreshing
	  parameters.
	  This function is needed after SetLayout and SetFont etc.
	  */
	void redoParagraphs(BufferView *, LyXCursor const & cursor,
			    Paragraph const * end_par) const;
	///
	void redoParagraph(BufferView *) const;

	///
	void toggleFree(BufferView *, LyXFont const &, bool toggleall = false);

	///
	string getStringToIndex(BufferView *);

	/** recalculates the heights of all previous rows of the
	    specified paragraph.  needed, if the last characters font
	    has changed.
	    */
	void redoHeightOfParagraph(BufferView *, LyXCursor const & cursor);

	/** insert a character, moves all the following breaks in the
	  same Paragraph one to the right and make a little rebreak
	  */
	void insertChar(BufferView *, char c);
	///
	void insertInset(BufferView *, Inset * inset);

	/** Completes the insertion with a full rebreak. */
	void fullRebreak(BufferView *);

	///
	mutable Row * need_break_row;
	///
	mutable int refresh_y;
	///
	int refresh_width;
	///
	int refresh_x;
	///
	mutable Row * refresh_row;
	///
	lyx::pos_type refresh_pos;

	/// give and set the LyXText status
	text_status status() const;
	///
	void status(BufferView *, text_status) const;

private:
	/** wether the screen needs a refresh,
	   starting with refresh_y
	   */
	mutable text_status status_;

public:
	/** returns a pointer to the row near the specified y-coordinate
	  (relative to the whole text). y is set to the real beginning
	  of this row
	  */
	Row * getRowNearY(int & y) const;

	/** returns the column near the specified x-coordinate of the row
	 x is set to the real beginning of this column
	 */
	lyx::pos_type getColumnNearX(BufferView *, Row * row,
					    int & x, bool & boundary) const;

	/** returns a pointer to a specified row. y is set to the beginning
	 of the row
	 */
	Row * getRow(Paragraph * par,
		     lyx::pos_type pos, int & y) const;
	/** returns the firstrow, this could be done with the above too but
	    IMO it's stupid to have to allocate a dummy y all the time I need
	    the first row
	*/
	Row * firstRow() { return firstrow; }

	/** returns the height of a default row, needed  for scrollbar
	 */
	int defaultHeight() const;

	/** The cursor.
	  Later this variable has to be removed. There should be now internal
	  cursor in a text (and thus not in a buffer). By keeping this it is
	  (I think) impossible to have several views with the same buffer, but
	  the cursor placed at different places.
	  [later]
	  Since the LyXText now has been moved from Buffer to BufferView
	  it should not be absolutely needed to move the cursor...
	  */
	mutable LyXCursor cursor; // actual cursor position

	/** 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;
		}
		LyXCursor cursor; // temporary cursor to hold a cursor position
				  // until setSelection is called!
		LyXCursor start;  // start of a REAL selection
		LyXCursor end;    // end of a REAL selection
	private:
		bool set_; // former selection
		bool mark_; // former mark_set

	};
	mutable Selection selection;
	// this is used to handle XSelection events in the right manner
	mutable Selection xsel_cache;

	/// needed for the toggling (cursor position on last selection made)
	mutable LyXCursor last_sel_cursor;
	/// needed for toggling the selection in screen.C
	mutable LyXCursor toggle_cursor;
	/// needed for toggling the selection in screen.C
	mutable LyXCursor toggle_end_cursor;

	/// need the selection cursor:
	void setSelection(BufferView *);
	///
	void clearSelection() const;
	///
	string const selectionAsString(Buffer const *, bool label) const;

	/// select the word we need depending on word_location
	void getWord(LyXCursor & from, LyXCursor & to,
		     word_location const) const;
	/// just selects the word the cursor is in
	void selectWord(BufferView *, word_location const);
	/// returns the inset at cursor (if it exists), 0 otherwise
	Inset * getInset() const;

	/** 'selects" the next word, where the cursor is not in
	 and returns this word as string. THe cursor will be moved
	 to the beginning of this word.
	 With SelectSelectedWord can this be highlighted really
	 */
	WordLangTuple selectNextWordToSpellcheck(BufferView *, float & value) const;
	///
	void selectSelectedWord(BufferView *);
	/// returns true if par was empty and was removed
	bool setCursor(BufferView *, Paragraph * par,
		       lyx::pos_type pos,
		       bool setfont = true,
		       bool boundary = false) const;
	///
	void setCursor(BufferView *, LyXCursor &, Paragraph * par,
		       lyx::pos_type pos,
		       bool boundary = false) const;
	///
	void setCursorIntern(BufferView *, Paragraph * par,
			     lyx::pos_type pos,
			     bool setfont = true,
			     bool boundary = false) const;
	///
	void setCurrentFont(BufferView *) const;

	///
	bool isBoundary(Buffer const *, Paragraph * par,
			lyx::pos_type pos) const;
	///
	bool isBoundary(Buffer const *, Paragraph * par,
			 lyx::pos_type pos,
			 LyXFont const & font) const;

	///
	void setCursorFromCoordinates(BufferView *, int x, int y) const;
	///
	void setCursorFromCoordinates(BufferView *, LyXCursor &,
				      int x, int y) const;
	///
	void cursorUp(BufferView *, bool selecting = false) const;
	///
	void cursorDown(BufferView *, bool selecting = false) const;
	///
	void cursorLeft(BufferView *, bool internal = true) const;
	///
	void cursorRight(BufferView *, bool internal = true) const;
	///
	void cursorLeftOneWord(BufferView *) const;
	///
	void cursorRightOneWord(BufferView *) const;
	///
	void cursorUpParagraph(BufferView *) const;
	///
	void cursorDownParagraph(BufferView *) const;
	///
	void cursorHome(BufferView *) const;
	///
	void cursorEnd(BufferView *) const;
	///
	void cursorTab(BufferView *) const;
	///
	void cursorTop(BufferView *) const;
	///
	void cursorBottom(BufferView *) const;
	///
	void Delete(BufferView *);
	///
	void backspace(BufferView *);
	///
	void deleteWordForward(BufferView *);
	///
	void deleteWordBackward(BufferView *);
	///
	void deleteLineForward(BufferView *);
	///
	bool selectWordWhenUnderCursor(BufferView *,
				       word_location const);
	///
	enum TextCase {
		///
		text_lowercase = 0,
		///
		text_capitalization = 1,
		///
		text_uppercase = 2
	};
	/// Change the case of the word at cursor position.
	void changeCase(BufferView *, TextCase action);
	///
	void transposeChars(BufferView &);

	/** returns a printed row in a pixmap. The y value is needed to
	  decide, wether it is selected text or not. This is a strange
	  solution but faster.
	 */
	void getVisibleRow(BufferView *, int y_offset, int x_offset,
			   Row * row_ptr, int y, bool cleared=false);

	///
	void toggleInset(BufferView *);
	///
	void cutSelection(BufferView *, bool doclear = true, bool realcut = true);
	///
	void copySelection(BufferView *);
	///
	void pasteSelection(BufferView *);
	///
	void copyEnvironmentType();
	///
	void pasteEnvironmentType(BufferView *);

	/** the DTP switches for paragraphs. LyX will store the top settings
	 always in the first physical paragraph, the bottom settings in the
	 last. When a paragraph is broken, the top settings rest, the bottom
	 settings are given to the new one. So I can make shure, they do not
	 duplicate themself (and you cannnot make dirty things with them! )
	 */
	void setParagraph(BufferView *,
			  bool line_top, bool line_bottom,
			  bool pagebreak_top, bool pagebreak_bottom,
			  VSpace const & space_top,
			  VSpace const & space_bottom,
			  Spacing const & spacing,
			  LyXAlignment align,
			  string labelwidthstring,
			  bool noindent);

	/* these things are for search and replace */

	/** sets the selection over the number of characters of string,
	  no check!!
	  */
	void setSelectionOverString(BufferView *, string const & str);

	/** simple replacing. The font of the first selected character
	  is used
	  */
	void replaceSelectionWithString(BufferView *, string const & str);

	/// needed to insert the selection
	void insertStringAsLines(BufferView *, string const & str);
	/// needed to insert the selection
	void insertStringAsParagraphs(BufferView *, string const & str);

	/// Find next inset of some specified type.
	bool gotoNextInset(BufferView *, std::vector<Inset::Code> const & codes,
			   string const & contents = string()) const;
	///

	/* for the greater insets */

	/// returns false if inset wasn't found
	bool updateInset(BufferView *, Inset *);
	///
	void checkParagraph(BufferView *, Paragraph * par, lyx::pos_type pos);
	///
	void toggleAppendix(BufferView *);
	///
	int workWidth(BufferView *) const;
	///
	int workWidth(BufferView *, Inset * inset) const;
	///
	void computeBidiTables(Buffer const *, Row * row) const;

	/// Maps positions in the visual string to positions in logical string.
	inline
	lyx::pos_type log2vis(lyx::pos_type pos) const {
		if (bidi_start == -1)
			return pos;
		else
			return log2vis_list[pos-bidi_start];
	}

	/// Maps positions in the logical string to positions in visual string.
	inline
	lyx::pos_type vis2log(lyx::pos_type pos) const {
		if (bidi_start == -1)
			return pos;
		else
			return vis2log_list[pos-bidi_start];
	}
	///
	inline
	lyx::pos_type bidi_level(lyx::pos_type pos) const {
		if (bidi_start == -1)
			return 0;
		else
			return bidi_levels[pos-bidi_start];
	}
	///
	inline
	bool bidi_InRange(lyx::pos_type pos) const {
		return bidi_start == -1 ||
			(bidi_start <= pos && pos <= bidi_end);
	}
private:
	///
	mutable Row * firstrow;

	///
	mutable Row * lastrow;

	///
	void cursorLeftOneWord(LyXCursor &) const;
 
	///
	float getCursorX(BufferView *, Row *, lyx::pos_type pos,
					 lyx::pos_type last, bool boundary) const;
	///
	void changeRegionCase(BufferView * bview,
				       LyXCursor const & from,
				       LyXCursor const & to,
				       LyXText::TextCase action);
	/// used in setlayout
	void makeFontEntriesLayoutSpecific(Buffer const *, Paragraph * par);

	/** forces the redrawing of a paragraph. Needed when manipulating a
	    right address box
	    */
	void redoDrawingOfParagraph(BufferView *, LyXCursor const & cursor);

	/** Copybuffer for copy environment type.
	  Asger has learned that this should be a buffer-property instead
	  Lgb has learned that 'char' is a lousy type for non-characters
	  */
	string copylayouttype;
	/** inserts a new row behind the specified row, increments
	    the touched counters */
	void insertRow(Row * row, Paragraph * par, lyx::pos_type pos) const;
	/** removes the row and reset the touched counters */
	void removeRow(Row * row) const;

	/** remove all following rows of the paragraph of the specified row. */
	void removeParagraph(Row * row) const;

	/** insert the specified paragraph behind the specified row */
	void insertParagraph(BufferView *,
			     Paragraph * par, Row * row) const;

	/** appends  the implizit specified paragraph behind the specified row,
	 * start at the implizit given position */
	void appendParagraph(BufferView *, Row * row) const;

	///
	void breakAgain(BufferView *, Row * row) const;
	///
	void breakAgainOneRow(BufferView *, Row * row);
	/// Calculate and set the height of the row
	void setHeightOfRow(BufferView *, Row * row_ptr) const;

	/** this calculates the specified parameters. needed when setting
	 * the cursor and when creating a visible row */
	void prepareToPrint(BufferView *, Row * row, float & x,
			    float & fill_separator,
			    float & fill_hfill,
			    float & fill_label_hfill,
			    bool bidi = true) const;

	/// A struct used for drawing routines
	struct DrawRowParams {
		// the bufferview
		BufferView * bv;
		// the row
		Row * row;
		// the painter to use
		Painter * pain;
		// has the background been cleared
		bool cleared;
		/// x offset (e.g. for insets)
		int xo;
		/// y offset (e.g. for insets)
		int yo;
		/// FIXME
		float x;
		/// FIXME
		int y;
		/// the inset/view full width
		int width;
		/// hfill size
		float hfill;
		/// label hfill size
		float label_hfill;
		/// fill separator size
		float separator;
	};

	/// paint the background
	bool paintRowBackground(DrawRowParams & p);

	/// paint the selection background
	void paintRowSelection(DrawRowParams & p);

	/// paint appendix marker
	void paintRowAppendix(DrawRowParams & p);

	/// paint page break marker. Returns its height.
	int paintPageBreak(string const & label, int y, DrawRowParams & p);
 
	/// paint env depth bar
	void paintRowDepthBar(DrawRowParams & p);

	/// get the on-screen size of the length marker
	int getLengthMarkerHeight(BufferView * bv, VSpace const & vsp) const;

	/// paint an added space marker
	int drawLengthMarker(DrawRowParams & p, string const & str,
		VSpace const & vsp, int start);

	/// paint a first row in a paragraph
	void paintFirstRow(DrawRowParams & p);

	/// paint a last row in a paragraph
	void paintLastRow(DrawRowParams & p);

	/// paint text
	void paintRowText(DrawRowParams & p);

	// fix the cursor `cur' after a characters has been deleted at `where'
	// position. Called by deleteEmptyParagraphMechanism
	void fixCursorAfterDelete(BufferView * bview,
				  LyXCursor & cur,
				  LyXCursor const & where) const;

	/// delete double space (false) or empty paragraphs (true) around old_cursor
	bool deleteEmptyParagraphMechanism(BufferView *,
					   LyXCursor const & old_cursor) const;

public:
	/** Updates all counters starting BEHIND the row. Changed paragraphs
	 * with a dynamic left margin will be rebroken. */
	void updateCounters(BufferView *) const;
private:
	///
	void setCounter(Buffer const *, Paragraph * par) const;

	/*
	 * some low level functions
	 */

	///
	int singleWidth(BufferView *, Paragraph * par,
		lyx::pos_type pos) const;
	///
	int singleWidth(BufferView *, Paragraph * par,
		lyx::pos_type pos, char c) const;


	/// draw normal chars
	void drawChars(DrawRowParams & p, lyx::pos_type & vpos,
		bool hebrew, bool arabic);
	/// draw from arabic composed char
	void drawArabicComposeChar(DrawRowParams & p, lyx::pos_type & vpos);
	/// draw from hebrew composed char
	void drawHebrewComposeChar(DrawRowParams & p, lyx::pos_type & vpos);
	/// draw a mark for foreign language, starting from orig_x
	void drawForeignMark(DrawRowParams & p, float const orig_x, LyXFont const & orig_font);
	/// draw an inset
	bool drawInset(DrawRowParams & p, lyx::pos_type const pos);
	/// draw new line marker
	void drawNewline(DrawRowParams & p, lyx::pos_type const pos);
	/// draw text
	bool draw(DrawRowParams & p, lyx::pos_type & vpos);

	/// get the next breakpoint in a given paragraph
	lyx::pos_type nextBreakPoint(BufferView *, Row const * row, int width) const;
	/// returns the minimum space a row needs on the screen in pixel
	int fill(BufferView *, Row * row, int workwidth) const;

	/** returns the minimum space a manual label needs on the
	  screen in pixel */
	int labelFill(BufferView *, Row const * row) const;

	///
	lyx::pos_type beginningOfMainBody(Buffer const *, Paragraph const * par) const;

	/** 
	 * Returns the left beginning of the text.
	 * This information cannot be taken from the layout object, because
	 * in LaTeX the beginning of the text fits in some cases
	 * (for example sections) exactly the label-width.
	 */
	int leftMargin(BufferView *, Row const * row) const;
	///
	int rightMargin(Buffer const *, Row const * row) const;
	///
	int labelEnd (BufferView *, Row const * row) const;

	/** returns the number of separators in the specified row.
	  The separator on the very last column doesnt count
	  */
	int numberOfSeparators(Buffer const *, Row const * row) const;

	/** returns the number of hfills in the specified row. The
	  LyX-Hfill is a LaTeX \hfill so that the hfills at the
	  beginning and at the end were ignored. This is {\em MUCH}
	  more usefull than not to ignore!
	  */
	int numberOfHfills(Buffer const *, Row const * row) const;

	/// like NumberOfHfills, but only those in the manual label!
	int numberOfLabelHfills(Buffer const *, Row const * row) const;
	/** returns true, if a expansion is needed. Rules are given by
	  LaTeX
	  */
	bool hfillExpansion(Buffer const *, Row const * row_ptr,
			    lyx::pos_type pos) const;
	///
	LColor::color backgroundColor();


	///
	mutable std::vector<lyx::pos_type> log2vis_list;

	///
	mutable std::vector<lyx::pos_type> vis2log_list;

	///
	mutable std::vector<lyx::pos_type> bidi_levels;

	///
	mutable lyx::pos_type bidi_start;

	///
	mutable lyx::pos_type bidi_end;

	///
	mutable bool bidi_same_direction;

	///
	unsigned char transformChar(unsigned char c, Paragraph * par,
				    lyx::pos_type pos) const;

	/** returns the paragraph position of the last character in the
	  specified row
	  */
	lyx::pos_type rowLast(Row const * row) const;
	///
	lyx::pos_type rowLastPrintable(Row const * row) const;

	///
	void charInserted();
public:
	//
	// special owner functions
	///
	Paragraph * ownerParagraph() const;
	//
	void ownerParagraph(Paragraph *) const;
	// set it searching first for the right owner using the paragraph id
	void ownerParagraph(int id, Paragraph *) const;
};

#endif