/* This file is part of
 * ======================================================
 * 
 *           LyX, The Document Processor
 * 	 
 *           Copyright 1995-2000 The LyX Team.
 *
 * ====================================================== */

#include <config.h>

#include "CutAndPaste.h"
#include "lyxparagraph.h"
#include "insets/inseterror.h"
#include "lyx_gui_misc.h"

#ifdef __GNUG__
#pragma implementation
#endif

using std::pair;

// Jürgen, note that this means that you cannot currently have a list
// of selections cut/copied. So IMHO later we should have a
// list/vector/deque that we could store
// struct selection_item {
//       LyXParagraph * buf;
//       LyXTextClassList::size_type textclass;
// };
// in and some method of choosing beween them (based on the first few chars
// in the selection probably.) This would be a nice feature and quite
// easy to implement. (Lgb)

static LyXParagraph * buf = 0;
static LyXTextClassList::size_type textclass = 0;

// for now here this should be in another Cut&Paste Class!
// Jürgen, I moved this out of CutAndPaste since it does not operate on any
// member of the CutAndPaste class and in addition it was private.
// Perhaps it even should take a parameter? (Lgb)
static
void DeleteBuffer()
{
	if (!buf) return;
	
	LyXParagraph * tmppar;
	
	while (buf) {
		tmppar =  buf;
		buf = buf->next;
		delete tmppar;
	}
	buf = 0;
}


bool CutAndPaste::cutSelection(LyXParagraph * startpar, LyXParagraph ** endpar,
			       int start, int & end, char tc, bool doclear)
{
    if (!startpar || (start > startpar->Last()))
	return false;

    DeleteBuffer();

    textclass = tc;

    if (!(*endpar) || (startpar->ParFromPos(start) ==
		       (*endpar)->ParFromPos(end))) {
	// only within one paragraph
	buf = new LyXParagraph;
	LyXParagraph::size_type i = start;
	if (end > startpar->Last())
	    end = startpar->Last();
	for (; i < end; ++i) {
	    startpar->CopyIntoMinibuffer(start);
	    /* table stuff -- begin */
	    if (startpar->table && startpar->IsNewline(start)) {
		++start;
	    } else {
		/* table stuff -- end */
		startpar->Erase(start);
	    }
	    buf->InsertFromMinibuffer(buf->Last());
	}
    } else {
	// more than one paragraph
	(*endpar)->BreakParagraphConservative(end);
	*endpar = (*endpar)->Next();
	end = 0;
   
	startpar->BreakParagraphConservative(start);

	// store the selection
	buf = startpar->ParFromPos(start)->next;
	buf->previous = 0;
	(*endpar)->previous->next = 0;

	// cut the selection
	startpar->ParFromPos(start)->next = (*endpar);
	
	(*endpar)->previous = startpar->ParFromPos(start);

	// care about footnotes
	if (buf->footnoteflag) {
	    LyXParagraph * tmppar = buf;
	    while (tmppar){
		tmppar->footnoteflag = LyXParagraph::NO_FOOTNOTE;
		tmppar = tmppar->next;
	    }
	}

	// the cut selection should begin with standard layout
	buf->Clear(); 
   
	// paste the paragraphs again, if possible
	if (doclear)
	    startpar->Next()->ClearParagraph();
	if (startpar->FirstPhysicalPar()->HasSameLayout(startpar->Next()) || 
	    !startpar->Next()->Last())
	    startpar->ParFromPos(start)->PasteParagraph();
    }
    return true;
}


bool CutAndPaste::copySelection(LyXParagraph * startpar, LyXParagraph * endpar,
				int start, int end, char tc)
{
    if (!startpar || (start > startpar->Last()))
	return false;

    DeleteBuffer();

    textclass = tc;

    if (!(endpar) || (startpar->ParFromPos(start) ==
		       (endpar)->ParFromPos(end))) {
	// only within one paragraph
	buf = new LyXParagraph;
	LyXParagraph::size_type i = start;
	if (end > startpar->Last())
	    end = startpar->Last();
	for (; i < end; ++i) {
	    startpar->CopyIntoMinibuffer(i);
	    buf->InsertFromMinibuffer(buf->Last());
	}
    } else {
	// copy more than one paragraph
	// clone the paragraphs within the selection
	LyXParagraph *tmppar = startpar->ParFromPos(start);
	buf = tmppar->Clone();
	LyXParagraph *tmppar2 = buf;
     
	while (tmppar != endpar->ParFromPos(end)
	       && tmppar->next) {
	    tmppar = tmppar->next;
	    tmppar2->next = tmppar->Clone();
	    tmppar2->next->previous = tmppar2;
	    tmppar2 = tmppar2->next;
	}
	tmppar2->next = 0;

	// care about footnotes
	if (buf->footnoteflag) {
	    tmppar = buf;
	    while (tmppar) {
		tmppar->footnoteflag = LyXParagraph::NO_FOOTNOTE;
		tmppar = tmppar->next;
	    }
	}
	
	// the buf paragraph is too big
	LyXParagraph::size_type tmpi2 = startpar->PositionInParFromPos(start);
	for (; tmpi2; --tmpi2)
	    buf->Erase(0);
	
	// now tmppar 2 is too big, delete all after end
	
	tmpi2 = endpar->PositionInParFromPos(end);
	while (tmppar2->size() > tmpi2) {
	    tmppar2->Erase(tmppar2->size() - 1);
	}
    }
    return true;
}


bool CutAndPaste::pasteSelection(LyXParagraph ** par, LyXParagraph ** endpar,
				 int & pos, char tc)
{
    if (!checkPastePossible(*par, pos))
	return false;

    if (pos > (*par)->Last())
	pos = (*par)->Last();

    LyXParagraph * tmpbuf;
    LyXParagraph * tmppar = *par;
    int tmppos = pos;

    // There are two cases: cutbuffer only one paragraph or many
    if (!buf->next) {
	// only within a paragraph
	tmpbuf = buf->Clone();
	/* table stuff -- begin */
	bool table_too_small = false;
	if ((*par)->table) {
	    while (buf->size() && !table_too_small) {
		if (buf->IsNewline(0)){
		    while((tmppos < tmppar->Last()) &&
			  !tmppar->IsNewline(tmppos))
			++tmppos;
		    buf->Erase(0);
		    if (tmppos < tmppar->Last())
			++tmppos;
		    else
			table_too_small = true;
		} else {
		    // This is an attempt to fix the
		    // "never insert a space at the
		    // beginning of a paragraph" problem.
		    if (!tmppos && buf->IsLineSeparator(0)) {
			buf->Erase(0);
		    } else {
			buf->CutIntoMinibuffer(0);
			buf->Erase(0);
			if (tmppar->InsertFromMinibuffer(tmppos))
			    ++tmppos;
		    }
		}
	    }
	} else {
	    /* table stuff -- end */
	    // Some provisions should be done here for checking
	    // if we are inserting at the beginning of a
	    // paragraph. If there are a space at the beginning
	    // of the text to insert and we are inserting at
	    // the beginning of the paragraph the space should
	    // be removed.
	    while (buf->size()) {
		// This is an attempt to fix the
		// "never insert a space at the
		// beginning of a paragraph" problem.
		if (!tmppos && buf->IsLineSeparator(0)) {
		    buf->Erase(0);
		} else {
		    buf->CutIntoMinibuffer(0);
		    buf->Erase(0);
		    if (tmppar->InsertFromMinibuffer(tmppos))
			++tmppos;
		}
	    }
	}
	delete buf;
	buf = tmpbuf;
	*endpar = tmppar->Next();
	pos = tmppos;
    } else {
	// many paragraphs

	// make a copy of the simple cut_buffer
	tmpbuf = buf;
	LyXParagraph * simple_cut_clone = tmpbuf->Clone();
	LyXParagraph * tmpbuf2 = simple_cut_clone;
	if ((*par)->footnoteflag){
	    tmpbuf->footnoteflag = (*par)->footnoteflag;
	    tmpbuf->footnotekind = (*par)->footnotekind;
	}
	while (tmpbuf->next) {
	    tmpbuf = tmpbuf->next;
	    tmpbuf2->next = tmpbuf->Clone();
	    tmpbuf2->next->previous = tmpbuf2;
	    tmpbuf2 = tmpbuf2->next;
	    if ((*par)->footnoteflag){
		tmpbuf->footnoteflag = (*par)->footnoteflag;
		tmpbuf->footnotekind = (*par)->footnotekind;
	    }
	}
	
	// make sure there is no class difference
	SwitchLayoutsBetweenClasses(textclass, tc, buf);
	
	// make the buf exactly the same layout than
	// the cursor paragraph
	buf->MakeSameLayout(*par);
	
	// find the end of the buffer
	LyXParagraph * lastbuffer = buf;
	while (lastbuffer->Next())
	    lastbuffer = lastbuffer->Next();
	
	bool paste_the_end = false;
	
	// open the paragraph for inserting the buf
	// if necessary
	if (((*par)->Last() > pos) || !(*par)->Next()) {
	    (*par)->BreakParagraphConservative(pos);
	    paste_the_end = true;
	}
	
	// set the end for redoing later
	*endpar = (*par)->ParFromPos(pos)->next->Next();
	
	// paste it!
	lastbuffer->ParFromPos(lastbuffer->Last())->next =
	    (*par)->ParFromPos(pos)->next;
	(*par)->ParFromPos(pos)->next->previous =
	    lastbuffer->ParFromPos(lastbuffer->Last());
	
	(*par)->ParFromPos(pos)->next = buf;
	buf->previous = (*par)->ParFromPos(pos);
	
	if ((*par)->ParFromPos(pos)->Next() == lastbuffer)
	    lastbuffer = *par;
	
	(*par)->ParFromPos(pos)->PasteParagraph();
	
	// store the new cursor position
	tmppar = lastbuffer;
	tmppos = lastbuffer->Last();
	
	// maybe some pasting
	if (lastbuffer->Next() && paste_the_end) {
	    if (lastbuffer->Next()->HasSameLayout(lastbuffer)) {
		lastbuffer->ParFromPos(lastbuffer->Last())->PasteParagraph();
	    } else if (!lastbuffer->Next()->Last()) {
		lastbuffer->Next()->MakeSameLayout(lastbuffer);
		lastbuffer->ParFromPos(lastbuffer->Last())->PasteParagraph();
	    } else if (!lastbuffer->Last()) {
		lastbuffer->MakeSameLayout(lastbuffer->next);
		lastbuffer->ParFromPos(lastbuffer->Last())->PasteParagraph();
	    } else
		lastbuffer->Next()->ClearParagraph();
	}
	// restore the simple cut buffer
	buf = simple_cut_clone;
	pos = tmppos;
    }

    return true;
}


int CutAndPaste::nrOfParagraphs() const
{
	if (!buf) return 0;

	int n = 1;
	LyXParagraph * tmppar = buf;
	while(tmppar->next) {
		++n;
		tmppar = tmppar->next;
	}
	return n;
}


int CutAndPaste::SwitchLayoutsBetweenClasses(LyXTextClassList::size_type c1,
					     LyXTextClassList::size_type c2,
					     LyXParagraph * par)
{
    int ret = 0;
    if (!par || c1 == c2)
	return ret;
    par = par->FirstPhysicalPar();
    while (par) {
	string name = textclasslist.NameOfLayout(c1, par->layout);
	int lay = 0;
	pair<bool, LyXTextClass::LayoutList::size_type> pp =
	    textclasslist.NumberOfLayout(c2, name);
	if (pp.first) {
	    lay = pp.second;
	} else { // layout not found
	    // use default layout "Standard" (0)
	    lay = 0;
	}
	par->layout = lay;
	
	if (name != textclasslist.NameOfLayout(c2, par->layout)) {
	    ++ret;
	    string s = "Layout had to be changed from\n"
		+ name + " to "
		+ textclasslist.NameOfLayout(c2, par->layout)
		+ "\nbecause of class conversion from\n"
		+ textclasslist.NameOfClass(c1) + " to "
		+ textclasslist.NameOfClass(c2);
	    InsetError * new_inset = new InsetError(s);
	    par->InsertChar(0, LyXParagraph::META_INSET);
	    par->InsertInset(0, new_inset);
	}
	
	par = par->next;
    }
    return ret;
}


bool CutAndPaste::checkPastePossible(LyXParagraph * par, int) const
{
    if (!buf) return false;

    LyXParagraph * tmppar;

    // be carefull with footnotes in footnotes
    if (par->footnoteflag != LyXParagraph::NO_FOOTNOTE) {
	// check whether the cut_buffer includes a footnote
	tmppar = buf;
	while (tmppar && tmppar->footnoteflag == LyXParagraph::NO_FOOTNOTE)
	    tmppar = tmppar->next;
      
	if (tmppar) {
	    WriteAlert(_("Impossible operation"),
		       _("Can't paste float into float!"),
		       _("Sorry."));
	    return false;
	}
    }
    /* table stuff -- begin */
    if (par->table) {
	if (buf->next) {
	    WriteAlert(_("Impossible operation"),
		       _("Table cell cannot include more than one paragraph!"),
		       _("Sorry."));
	    return false;
	}
    }
    /* table stuff -- end */
    return true;
}