/* This file is part of
 * ======================================================
 * 
 *           LyX, The Document Processor
 * 	 
 *          Copyright 1998-2001 The LyX Team.
 *
 * ======================================================
 */

#include <config.h>

#ifdef __GNUG__
#pragma implementation
#endif

#include "insetcollapsable.h"
#include "gettext.h"
#include "lyxfont.h"
#include "BufferView.h"
#include "Painter.h"
#include "insets/insettext.h"
#include "support/LOstream.h"
#include "support/lstrings.h"
#include "debug.h"
#include "lyxtext.h"

class LyXText;

using std::ostream;
using std::endl;
using std::max;


InsetCollapsable::InsetCollapsable()
	: UpdatableInset()
{
	inset.setOwner(this);
	collapsed = false;
	label = "Label";
	autocollapse = true;
	inset.SetAutoBreakRows(true);
	inset.SetDrawFrame(0, InsetText::ALWAYS);
	inset.SetFrameColor(0, LColor::collapsableframe);
	button_length = button_top_y = button_bottom_y = 0;
	setInsetName("Collapsable");
	widthCollapsed = oldWidth = 0;
	need_update = FULL;
}


bool InsetCollapsable::InsertInset(BufferView * bv, Inset * in)
{
	if (!InsertInsetAllowed(in)) {
		lyxerr << "InsetCollapsable::InsertInset: "
			"Unable to insert inset." << endl;
		return false;
	}
	return inset.InsertInset(bv, in);
}


void InsetCollapsable::Write(Buffer const * buf, ostream & os) const
{
	os << "collapsed " << tostr(collapsed) << "\n";
	inset.WriteParagraphData(buf, os);
}



void InsetCollapsable::Read(Buffer const * buf, LyXLex & lex)
{
	if (lex.IsOK()) {
		lex.next();
		string const token = lex.GetString();
		if (token == "collapsed") {
			lex.next();
			collapsed = lex.GetBool();
		} else {
			lyxerr << "InsetCollapsable::Read: Missing collapsed!"
			       << endl;
		}
	}
	inset.Read(buf, lex);
}


int InsetCollapsable::ascent_collapsed(Painter & pain, LyXFont const &) const
{
	int width = 0;
	int ascent = 0;
	int descent = 0;
	pain.buttonText(0, 0, label, labelfont, false, 
			width, ascent, descent);
	return ascent;
}


int InsetCollapsable::descent_collapsed(Painter & pain, LyXFont const &) const
{
	int width = 0;
	int ascent = 0;
	int descent = 0;
	pain.buttonText(0, 0, label, labelfont, false, 
			width, ascent, descent);
	return descent;
}


int InsetCollapsable::width_collapsed(Painter & pain, LyXFont const &) const
{
	int width;
	int ascent;
	int descent;
	pain.buttonText(TEXT_TO_INSET_OFFSET, 0, label, labelfont, false,
			width, ascent, descent);
	return width + (2*TEXT_TO_INSET_OFFSET);
}


int InsetCollapsable::ascent(BufferView * bv, LyXFont const & font) const
{
	return ascent_collapsed(bv->painter(), font);
}


int InsetCollapsable::descent(BufferView * bv, LyXFont const & font) const
{
	if (collapsed) 
		return descent_collapsed(bv->painter(), font);

	return descent_collapsed(bv->painter(), font)
		+ inset.descent(bv, font)
		+ inset.ascent(bv, font)
		+ TEXT_TO_BOTTOM_OFFSET;
}


int InsetCollapsable::width(BufferView * bv, LyXFont const & font) const
{
	if (collapsed) 
		return widthCollapsed;

	return (inset.width(bv, font) > widthCollapsed) ?
		inset.width(bv, font) : widthCollapsed;
}


void InsetCollapsable::draw_collapsed(Painter & pain, LyXFont const &,
				      int baseline, float & x) const
{
	int width = 0;
	pain.buttonText(int(x) + TEXT_TO_INSET_OFFSET,
			baseline, label, labelfont, true, width);
	x += width + TEXT_TO_INSET_OFFSET;
}


void InsetCollapsable::draw(BufferView * bv, LyXFont const & f, 
			    int baseline, float & x, bool cleared) const
{
	if (nodraw())
		return;

	Painter & pain = bv->painter();

	button_length = widthCollapsed;
	button_top_y = -ascent(bv, f);
	button_bottom_y = -ascent(bv, f) + ascent_collapsed(pain,f) +
		descent_collapsed(pain, f);

	if (collapsed) {
		draw_collapsed(pain, f, baseline, x);
		x += TEXT_TO_INSET_OFFSET;
		return;
	}

	float old_x = x;

#if 0
	UpdatableInset::draw(bv, f, baseline, x, cleared);
#else
	if (!owner())
		x += static_cast<float>(scroll());
#endif
	if (!cleared && (inset.need_update == InsetText::FULL ||
			 inset.need_update == InsetText::INIT ||
			 top_x != int(x) ||
			 top_baseline != baseline))
	{
#if 1
		// we don't need anymore to clear here we just have to tell
		// the underlying LyXText that it should do the RowClear!
		inset.SetUpdateStatus(bv, InsetText::FULL);
		bv->text->status = LyXText::CHANGED_IN_DRAW;
		return;
#else
		int w =  owner() ? width(bv, f) : pain.paperWidth();
		int h = ascent(bv, f) + descent(bv, f);
		int const tx = (needFullRow() && !owner()) ? 0 : int(x);
		int const ty = max(0, baseline - ascent(bv, f));

		if ((ty + h) > pain.paperHeight())
			h = pain.paperHeight();
		if ((top_x + w) > pain.paperWidth())
			w = pain.paperWidth();
		if (baseline < 0)
			h += (baseline - ascent(bv, f));
		pain.fillRectangle(tx, ty - 1, w, h + 2);
		cleared = true;
#endif
	}

	top_x = int(x);
	top_baseline = baseline;

	int const bl = baseline - ascent(bv, f) + ascent_collapsed(pain, f);

	draw_collapsed(pain, f, bl, old_x);
	inset.draw(bv, f, 
		   bl + descent_collapsed(pain, f) + inset.ascent(bv, f),
		   x, cleared);
	need_update = NONE;
}


void InsetCollapsable::Edit(BufferView * bv, int xp, int yp,
			    unsigned int button)
{
	UpdatableInset::Edit(bv, xp, yp, button);

	if (collapsed && autocollapse) {
		collapsed = false;
		if (!bv->lockInset(this))
			return;
		bv->updateInset(this, false);
		inset.Edit(bv, 0, 0, button);
	} else if (!collapsed) {
		if (!bv->lockInset(this))
			return;
		inset.Edit(bv, xp, yp + (top_baseline - inset.y()), button);
	}
}


Inset::EDITABLE InsetCollapsable::Editable() const
{
	if (collapsed)
		return IS_EDITABLE;
	return HIGHLY_EDITABLE;
}


void InsetCollapsable::InsetUnlock(BufferView * bv)
{
	if (autocollapse) {
		collapsed = true;
	}
	inset.InsetUnlock(bv);
	if (scroll())
		scroll(bv, 0.0F);
	bv->updateInset(this, false);
}


void InsetCollapsable::InsetButtonPress(BufferView * bv, int x, int y,
					int button)
{
	if (!collapsed && (y > button_bottom_y)) {
		inset.InsetButtonPress(bv, x, y + (top_baseline - inset.y()),
				       button);
	}
}


void InsetCollapsable::InsetButtonRelease(BufferView * bv,
					  int x, int y, int button)
{
	if ((x >= 0)  && (x < button_length) &&
	    (y >= button_top_y) &&  (y <= button_bottom_y)) {
		if (collapsed) {
			collapsed = false;
			inset.InsetButtonRelease(bv, 0, 0, button);
			bv->updateInset(this, false);
		} else {
			collapsed = true;
			bv->unlockInset(this);
			bv->updateInset(this, false);
		}
	} else if (!collapsed && (y > button_top_y)) {
		inset.InsetButtonRelease(bv, x, y + (top_baseline-inset.y()),
					 button);
	}
}


void InsetCollapsable::InsetMotionNotify(BufferView * bv,
					 int x, int y, int state)
{
	if (x > button_bottom_y) {
		inset.InsetMotionNotify(bv, x, y + (top_baseline - inset.y()),
					state);
	}
}


void InsetCollapsable::InsetKeyPress(XKeyEvent * xke)
{
	inset.InsetKeyPress(xke);
}


int InsetCollapsable::Latex(Buffer const * buf, ostream & os,
			    bool fragile, bool free_spc) const
{
	return inset.Latex(buf, os, fragile, free_spc);
}


int InsetCollapsable::getMaxWidth(BufferView * bv,
				  UpdatableInset const * inset) const
{
	int const w = UpdatableInset::getMaxWidth(bv, inset);

	if (w < 0) {
		// What does a negative max width signify? (Lgb)
		// Use the max width of the draw-area (Jug)
		return w;
	}
	// should be at least 30 pixels !!!
	return max(30, w - widthCollapsed);
}


void InsetCollapsable::update(BufferView * bv, LyXFont const & font,
			      bool reinit)
{
	if (reinit) {
		need_update = FULL;
		if (owner())
			owner()->update(bv, font, true);
		return;
	}
	if (!widthCollapsed) {
		widthCollapsed = width_collapsed(bv->painter(), font);
		inset.resizeLyXText(bv);
		need_update = FULL;
		if (owner()) {
			owner()->update(bv, font);
			return;
		}
	}
	if (oldWidth != width(bv, font)) {
		oldWidth = width(bv, font);
		inset.resizeLyXText(bv);
		need_update = FULL;
		if (owner()) {
			owner()->update(bv, font);
			return;
		}
	}
	inset.update(bv, font);
}


UpdatableInset::RESULT
InsetCollapsable::LocalDispatch(BufferView * bv, kb_action action,
				string const & arg)
{
	UpdatableInset::RESULT result = inset.LocalDispatch(bv, action, arg);
	if (result == FINISHED)
		bv->unlockInset(this);
	return result;
}


bool InsetCollapsable::LockInsetInInset(BufferView * bv, UpdatableInset * in)
{
	if (&inset == in)
		return true;
	return inset.LockInsetInInset(bv, in);
}


bool InsetCollapsable::UnlockInsetInInset(BufferView * bv, UpdatableInset * in,
					  bool lr)
{
	if (&inset == in) {
		bv->unlockInset(this);
		return true;
	}
	return inset.UnlockInsetInInset(bv, in, lr);
}


bool InsetCollapsable::UpdateInsetInInset(BufferView * bv, Inset *in)
{
	if (&inset == in)
		return true;
	return inset.UpdateInsetInInset(bv, in);
}


unsigned int InsetCollapsable::InsetInInsetY()
{
	return inset.InsetInInsetY() - (top_baseline - inset.y());
}


void InsetCollapsable::Validate(LaTeXFeatures & features) const
{
	inset.Validate(features);
}


void InsetCollapsable::GetCursorPos(BufferView * bv, int & x, int & y) const
{
	inset.GetCursorPos(bv, x , y);
}


void InsetCollapsable::ToggleInsetCursor(BufferView * bv)
{
	inset.ToggleInsetCursor(bv);
}


UpdatableInset * InsetCollapsable::GetLockingInset()
{
	UpdatableInset * in = inset.GetLockingInset();
	if (&inset == in)
		return this;
	return in;
}


UpdatableInset * InsetCollapsable::GetFirstLockingInsetOfType(Inset::Code c)
{
	if (c == LyxCode())
		return this;
	return inset.GetFirstLockingInsetOfType(c);
}


void InsetCollapsable::SetFont(BufferView * bv, LyXFont const & font,
                               bool toggleall, bool selectall)
{
	inset.SetFont(bv, font, toggleall, selectall);
}


bool InsetCollapsable::doClearArea() const
{
	return inset.doClearArea();
}


LyXText * InsetCollapsable::getLyXText(BufferView const * bv,
				       bool const recursive) const
{
	return inset.getLyXText(bv, recursive);
}


void InsetCollapsable::deleteLyXText(BufferView * bv, bool recursive) const
{
	inset.deleteLyXText(bv, recursive);
}


void InsetCollapsable::resizeLyXText(BufferView * bv) const
{
	inset.resizeLyXText(bv);
	LyXFont font(LyXFont::ALL_SANE);
	oldWidth = width(bv, font);
}


std::vector<string> const InsetCollapsable::getLabelList() const
{
	return inset.getLabelList();
}


bool InsetCollapsable::nodraw() const
{
	return inset.nodraw();
}

 
int InsetCollapsable::scroll(bool recursive) const
{
	int sx = UpdatableInset::scroll(false);

	if (recursive)
		sx += inset.scroll(recursive);

	return sx;
}