/**
 * \file xforms/lyx_gui.C
 * This file is part of LyX, the document processor.
 * Licence details can be found in the file COPYING.
 *
 * \author Lars Gullik Bjønnes
 * \author John Levon
 *
 * Full author contact details are available in file CREDITS.
 */

#include <config.h>

#include "lyx_gui.h"
#include "ColorHandler.h"
#include "xfont_loader.h"
#include "xforms_helpers.h"
#include "xformsImage.h"
#include "XFormsView.h"

#include "bufferlist.h"
#include "BufferView.h"
#include "debug.h"
#include "funcrequest.h"
#include "gettext.h"
#include "LColor.h"
#include "lyx_main.h"
#include "LyXAction.h"
#include "lyxfunc.h"
#include "lyxrc.h"
#include "session.h"
#include "lyxserver.h"
#include "lyxsocket.h"

#include "graphics/LoaderQueue.h"

#include "support/filetools.h"
#include "support/lyxlib.h"
#include "support/os.h"
#include "support/package.h"
#include "support/convert.h"

#include "lyx_forms.h"

#include <boost/bind.hpp>

#include <fcntl.h>

#include <sstream>
#include <iomanip>

using lyx::support::addName;
using lyx::support::package;

using lyx::frontend::fontloader;
using lyx::frontend::lyxColorHandler;
using lyx::frontend::LyXColorHandler;
using lyx::frontend::XformsColor;
using lyx::frontend::XFormsView;

namespace os = lyx::support::os;

#ifndef CXX_GLOBAL_CSTD
using std::exit;
#endif

using std::dec;
using std::endl;
using std::hex;
using std::setbase;
using std::setfill;
using std::setw;
using std::ostringstream;
using std::vector;
using std::string;


extern BufferList bufferlist;

// FIXME: wrong place !
LyXServer * lyxserver;
LyXServerSocket * lyxsocket;

namespace {

/// quit lyx
bool finished = false;

/// estimate DPI from X server
int getDPI()
{
	Screen * scr = ScreenOfDisplay(fl_get_display(), fl_screen);
	return int(((HeightOfScreen(scr) * 25.4 / HeightMMOfScreen(scr)) +
		(WidthOfScreen(scr) * 25.4 / WidthMMOfScreen(scr))) / 2);
}


/// set default GUI configuration
void setDefaults()
{
	FL_IOPT cntl;
	cntl.buttonFontSize = FL_NORMAL_SIZE;
	cntl.browserFontSize = FL_NORMAL_SIZE;
	cntl.labelFontSize = FL_NORMAL_SIZE;
	cntl.choiceFontSize = FL_NORMAL_SIZE;
	cntl.inputFontSize = FL_NORMAL_SIZE;
	cntl.menuFontSize  = FL_NORMAL_SIZE;
	cntl.borderWidth = -1;
	cntl.vclass = FL_DefaultVisual;
	fl_set_defaults(FL_PDVisual
			| FL_PDButtonFontSize
			| FL_PDBrowserFontSize
			| FL_PDLabelFontSize
			| FL_PDChoiceFontSize
			| FL_PDInputFontSize
			| FL_PDMenuFontSize
			| FL_PDBorderWidth, &cntl);
}


extern "C" {

int LyX_XErrHandler(Display * display, XErrorEvent * xeev) {
	// We don't abort on BadWindow
	if (xeev->error_code == BadWindow) {
		lyxerr << "BadWindow received !" << endl;
		lyxerr << "If you're using xforms 1.0 or greater, "
			<< " please report this to lyx-devel@lists.lyx.org" << endl;
		return 0;
	}

	// emergency cleanup
	LyX::cref().emergencyCleanup();

	// Get the reason for the crash.
	char etxt[513];
	XGetErrorText(display, xeev->error_code, etxt, 512);
	lyxerr << etxt << " id: " << xeev->resourceid << endl;
	// By doing an abort we get a nice backtrace. (hopefully)
	lyx::support::abort();
	return 0;
}

}

/// read in geometry specification
char geometry[40];

} // namespace anon


namespace lyx_gui {

bool use_gui = true;


void parse_init(int & argc, char * argv[])
{
	setDefaults();

	FL_CMD_OPT cmdopt[] = {
		{"-geometry", "*.geometry", XrmoptionSepArg, "690x510"}
	};

	FL_resource res[] = {
		{"geometry", "geometryClass", FL_STRING, geometry, "", 40}
	};

	const int num_res = sizeof(res)/sizeof(FL_resource);

	fl_initialize(&argc, argv, "LyX", cmdopt, num_res);

	// It appears that, in xforms >=0.89.5, fl_initialize()
	// calls setlocale() and ruins our LC_NUMERIC setting.
	locale_init();

	fl_get_app_resources(res, num_res);

	Display * display = fl_get_display();

	if (!display) {
		lyxerr << "LyX: unable to access X display, exiting" << endl;
		::exit(1);
	}

	fcntl(ConnectionNumber(display), F_SETFD, FD_CLOEXEC);

	XSetErrorHandler(LyX_XErrHandler);

	lyxColorHandler.reset(new LyXColorHandler);

	using namespace lyx::graphics;

	// connect the image loader based on the xforms library
	Image::newImage = boost::bind(&xformsImage::newImage);
	Image::loadableFormats = boost::bind(&xformsImage::loadableFormats);

	// must do this /before/ lyxrc gets read
	lyxrc.dpi = getDPI();

	LoaderQueue::setPriority(10,100);
}


void parse_lyxrc()
{
	XformsColor::read(addName(package().user_support(),
				  "preferences.xform"));

	if (lyxrc.popup_font_encoding.empty())
		lyxrc.popup_font_encoding = lyxrc.font_norm;
	// Set the font name for popups and menus
	string boldfontname = lyxrc.popup_bold_font
			       + "-*-*-*-?-*-*-*-*-"
			       + lyxrc.popup_font_encoding;
		// "?" means "scale that font"
	string fontname = lyxrc.popup_normal_font
			       + "-*-*-*-?-*-*-*-*-"
			       + lyxrc.popup_font_encoding;

	int bold = fl_set_font_name(FL_BOLD_STYLE, boldfontname.c_str());
	int normal = fl_set_font_name(FL_NORMAL_STYLE, fontname.c_str());
	if (bold < 0)
		lyxerr << "Could not set menu font to "
		       << boldfontname << endl;

	if (normal < 0)
		lyxerr << "Could not set popup font to "
		       << fontname << endl;

	if (bold < 0 && normal < 0) {
		lyxerr << "Using 'helvetica' font for menus" << endl;
		boldfontname = "-*-helvetica-bold-r-*-*-*-?-*-*-*-*-iso8859-1";
		fontname = "-*-helvetica-medium-r-*-*-*-?-*-*-*-*-iso8859-1";
		bold = fl_set_font_name(FL_BOLD_STYLE, boldfontname.c_str());
		normal = fl_set_font_name(FL_NORMAL_STYLE, fontname.c_str());

		if (bold < 0 && normal < 0) {
			lyxerr << "Could not find helvetica font. Using 'fixed'." << endl;
			fl_set_font_name(FL_NORMAL_STYLE, "fixed");
			normal = bold = 0;
		}
	}
	if (bold < 0)
		fl_set_font_name(FL_BOLD_STYLE, fontname.c_str());
	else if (normal < 0)
		fl_set_font_name(FL_NORMAL_STYLE, boldfontname.c_str());

	fl_setpup_fontstyle(FL_NORMAL_STYLE);
	fl_setpup_fontsize(FL_NORMAL_SIZE);
	fl_setpup_color(FL_MCOL, FL_BLACK);
	fl_set_goodies_font(FL_NORMAL_STYLE, FL_NORMAL_SIZE);
	fl_set_tooltip_font(FL_NORMAL_STYLE, FL_NORMAL_SIZE);
}


void start(string const & batch, vector<string> const & files)
{
	// initial geometry
	int xpos = -1;
	int ypos = -1;
	unsigned int width = 690;
	unsigned int height = 510;
	// first try lyxrc
	if (lyxrc.geometry_width != 0 && lyxrc.geometry_height != 0 ) {
		width = lyxrc.geometry_width;
		height = lyxrc.geometry_height;
	}
	// if lyxrc returns (0,0), then use session info
	else {
		string val = LyX::ref().session().loadSessionInfo("WindowWidth");
		if (val != "")
			width = convert<unsigned int>(val);
		val = LyX::ref().session().loadSessionInfo("WindowHeight");
		if (val != "")
			height = convert<unsigned int>(val);
	}

	int const geometryBitmask =
		XParseGeometry(geometry,
			       &xpos, &ypos, &width, &height);

	// if width is not set by geometry, check it against monitor width
	if (!(geometryBitmask & WidthValue)) {
		Screen * scr = ScreenOfDisplay(fl_get_display(), fl_screen);
		if (WidthOfScreen(scr) - 8 < int(width))
			width = WidthOfScreen(scr) - 8;
	}

	// if height is not set by geometry, check it against monitor height
	if (!(geometryBitmask & HeightValue)) {
		Screen * scr = ScreenOfDisplay(fl_get_display(), fl_screen);
		if (HeightOfScreen(scr) - 24 < int(height))
			height = HeightOfScreen(scr) - 24;
	}

	Screen * s = ScreenOfDisplay(fl_get_display(), fl_screen);

	// recalculate xpos if it's not set
	if (xpos == -1)
		xpos = (WidthOfScreen(s) - width) / 2;

	// recalculate ypos if it's not set
	if (ypos == -1)
		ypos = (HeightOfScreen(s) - height) / 2;

	lyxerr[Debug::GUI] << "Creating view: " << width << 'x' << height
			   << '+' << xpos << '+' << ypos << endl;

	boost::shared_ptr<XFormsView> view(new XFormsView(width, height));
	LyX::ref().addLyXView(view);

	view->show(xpos, ypos, "LyX");
	view->init();

	// FIXME: some code below needs moving

	lyxserver = new LyXServer(&view->getLyXFunc(), lyxrc.lyxpipes);
	lyxsocket = new LyXServerSocket(&view->getLyXFunc(),
			  os::internal_path(package().temp_dir() + "/lyxsocket"));

	for_each(files.begin(), files.end(),
		bind(&BufferView::loadLyXFile, view->view(), _1, true));

	// handle the batch commands the user asked for
	if (!batch.empty())
		view->getLyXFunc().dispatch(lyxaction.lookupFunc(batch));

	// enter the event loop
	while (!finished) {
		if (fl_check_forms() == FL_EVENT) {
			XEvent ev;
			fl_XNextEvent(&ev);
			lyxerr[Debug::GUI]
				<< "Received unhandled X11 event" << endl
				<< "Type: " << ev.xany.type
				<< " Target: 0x" << hex << ev.xany.window
				<< dec << endl;
		}
	}

	// FIXME: breaks emergencyCleanup
	delete lyxsocket;
	delete lyxserver;
}


void exit()
{
	finished = true;
}


void sync_events()
{
	// FIXME
}


FuncStatus getStatus(FuncRequest const & /*ev*/)
{
	// Nothing interesting to do here
	return FuncStatus();
}


bool getRGBColor(LColor_color col, lyx::RGBColor & rgbcol)
{
	string const name = lcolor.getX11Name(col);
	Display * const display = fl_get_display();
	Colormap const cmap = fl_state[fl_get_vclass()].colormap;
	XColor xcol, ccol;

	if (XLookupColor(display, cmap, name.c_str(), &xcol, &ccol) == 0) {
		rgbcol.r = 0;
		rgbcol.g = 0;
		rgbcol.b = 0;
		return false;
	}

	// Note that X stores the RGB values in the range 0 - 65535
	// whilst we require them in the range 0 - 255.
	rgbcol.r = xcol.red   / 256;
	rgbcol.g = xcol.green / 256;
	rgbcol.b = xcol.blue  / 256;
	return true;
}


string const hexname(LColor_color col)
{
	lyx::RGBColor rgbcol;
	if (!getRGBColor(col, rgbcol)) {
		lyxerr << "X can't find color for \"" << lcolor.getLyXName(col)
		       << '"' << endl;
		return string();
	}

	ostringstream os;

	os << setbase(16) << setfill('0')
	   << setw(2) << rgbcol.r
	   << setw(2) << rgbcol.g
	   << setw(2) << rgbcol.b;

	return os.str();
}


void update_color(LColor_color col)
{
	lyxColorHandler->getGCForeground(col);
	lyxColorHandler->updateColor(col);
}


void update_fonts()
{
	fontloader.update();
}


bool font_available(LyXFont const & font)
{
	return fontloader.available(font);
}


namespace {

std::map<int, boost::function<void()> > socket_callbacks;

extern "C"
void C_socket_callback(int fd, void *)
{
	socket_callbacks[fd]();
}


} // NS anon


void register_socket_callback(int fd, boost::function<void()> func)
{
	socket_callbacks[fd] = func;
	fl_add_io_callback(fd, FL_READ, C_socket_callback, 0);
}


void unregister_socket_callback(int fd)
{
	fl_remove_io_callback(fd, FL_READ, C_socket_callback);
	socket_callbacks.erase(fd);
}


string const roman_font_name()
{
	return "times";
}


string const sans_font_name()
{
	return "helvetica";
}


string const typewriter_font_name()
{
	return "courier";
}

}; // namespace lyx_gui