/**
 *  rewrite of "Document" concept, from scratch.
 *  This is really just a prototype, so I may go back to using the
 *  old "Document" class. But I need a place to hold the new concepts,
 *  so here it is.
 *
 *  This is the top-level class for actually holding user-input data.
 *  The GUI interacts with this class, via the TextInterface construct.
 *  We also need to implement DocInterface here.
 *
 * Possibly we need to merge TextInterface more with DocInterface.
 * We need to add something about changing existing text area margins,
 * blah blah blah, so we can then test multiple TFrames in the same
 * TPage
 *
 *  We may be trimming down TextInterface a bit, too.
 *  (to get rid of the TextMode support, possibly) Then again,
 * COULD just stub that stuff out.
 *
 */

class JDoc implements DocInterface {
	TCursor tcursor;
	TFrameManager tframes;
	GUIInterface GUI;

	public JDoc(){
		DocInit();
	}
	void DocInit(){
		tcursor=new TCursor();
		/* after loading a doc, this should be set better */
		/* ALso, after setting margins or something...?*/
		
		tframes=new TFrameManager();
		
	}


	/********************************************************
	 * Here are the routines required by DocInteface	*
	 ********************************************************/

	public void addString(String newtext) throws java.io.IOException{
		do something at cursor
		relate this to methods used below in
		addChar()
		delChar()
	}

	// These should do something with TPage
	public void setLeftMargin(int ptdist) throws java.io.IOException;
	public void setRightMargin(int ptdist) throws java.io.IOException;
	public void setTopMargin(int ptdist) throws java.io.IOException;
	public void setBottomMargin(int ptdist) throws java.io.IOException;


	/****************************************************
	 * And now, the TextInterface stuff  *
	 ****************************************************/
	public void setCursorByPoint(int pagenum, Point p){
		GUI.hideCursor();
		if(tcursor.pageid != pagenum){
			pages.hidecursor(tcursor.pageid);
			tcursor.pageid=pagenum;
		}
		pages.getPageAt(pagenum).setCursor(tcursor,p);
		debug("JDoc.setCursorByPoint not done");
		showCursor();
	}

	public void setCursor(int pagenum, int row, int column){
		GUI.hideCursor();
		if(tcursor.pageid != pagenum){
			pages.hidecursor(tcursor.pageid);
			tcursor.pageid=pagenum;
		}
		pages.getPageAt(pagenum).setCursor(tcursor,row,column);
		debug("JDoc.setCursor not done");
		showCursor();
	}

	/* This is tough to figure out where it should be run from
	 * I suppose it should be coordinated here. But
	 * there's also a lot of lowerlevel coordination needed,
	 * at frame level,and possibly page level
	 */
	public void adjCursor(int coladj, int rowadj){
		GUI.hideCursor();
		debug("JDoc.adjCursor not done");
		showCursor();
	}

	public boolean addChar(char newchar){
		GUI.hideCursor();
		debug("JDoc.addChar not done");
		showCursor();
	}

	/*--------------------------------------------------------------*/
	/* addString() already implemented above, in DocInteface section*/
	/*--------------------------------------------------------------*/

	public boolean delChar();
	public boolean delCharLeft();
	public boolean delWord();


	public void repaintRegion(int pagenum, Point startpoint,
				  Point endpoint){
		pages.getPageAt(pagenum).repaintRegion(GUI,pagenum,
					startpoint,endpoint);
	}

	public void repaintPage(int pagenum){
		pages.getPageAt(pagenum).repaintPage(GUI,pagenum);
		
	}

	/****************************************************************/
	 * Below here, are convenience functions. Any public function	*
	 * should go ABOVE HERE						*
	 ****************************************************************/

	void debug(String msg){ System.out.println(msg); }

	/* A convinience function to abstract showing the cursor
	 * to the user in the right place.
	 * We assume that TCursor has been updated appropriately
	 * BEFORE calling us here.
	 */
	void showCursor(){
		GUI.showCursor(tcursor.pageid, tcursor.pagexpos,
					tcursor.pageypos);
	}
	
}