/*
    Copyright (C) 2008 Paul Davis

    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation; either version 2 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program; if not, write to the Free Software
    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.

*/

#include <string>

#include "pbd/failed_constructor.h"
#include "pbd/file_utils.h"

#include "ardour/ardour.h"
#include "ardour/filesystem_paths.h"

#include "gtkmm2ext/utils.h"

#ifdef check
#undef check
#endif

#include "gui_thread.h"
#include "splash.h"

#include "pbd/i18n.h"

using namespace Gtk;
using namespace Glib;
using namespace PBD;
using namespace std;
using namespace ARDOUR;

Splash* Splash::the_splash = 0;

Splash::Splash ()
{
	assert (the_splash == 0);

	std::string splash_file;

	Searchpath rc (ARDOUR::ardour_data_search_path());
	rc.add_subdirectory_to_paths ("resources");

	if (!find_file (rc, PROGRAM_NAME "-splash.png", splash_file)) {
                cerr << "Cannot find splash screen image file\n";
		throw failed_constructor();
	}

	try {
		pixbuf = Gdk::Pixbuf::create_from_file (splash_file);
	}

	catch (...) {
                cerr << "Cannot construct splash screen image\n";
		throw failed_constructor();
	}

	darea.set_size_request (pixbuf->get_width(), pixbuf->get_height());
	pop_front ();
	set_position (WIN_POS_CENTER);
	darea.add_events (Gdk::BUTTON_PRESS_MASK|Gdk::BUTTON_RELEASE_MASK);
	darea.set_double_buffered (false);

	layout = create_pango_layout ("");
	string str = "<b>";
	string i18n = string_compose (_("%1 loading ..."), PROGRAM_NAME);
	str += i18n;
	str += "</b>";

	layout->set_markup (str);

	darea.show ();
	darea.signal_expose_event().connect (sigc::mem_fun (*this, &Splash::expose));

	add (darea);

	set_default_size (pixbuf->get_width(), pixbuf->get_height());
	set_resizable (false);
	set_type_hint(Gdk::WINDOW_TYPE_HINT_SPLASHSCREEN);
	the_splash = this;

        expose_done = false;
        expose_is_the_one = false;

	ARDOUR::BootMessage.connect (msg_connection, invalidator (*this), boost::bind (&Splash::boot_message, this, _1), gui_context());
}

Splash::~Splash ()
{
	the_splash = 0;
}

void
Splash::pop_back_for (Gtk::Window& win)
{
#if defined  __APPLE__ || defined PLATFORM_WINDOWS
        /* April 2013: window layering on OS X is a bit different to X Window. at present,
           the "restack()" functionality in GDK will only operate on windows in the same
           "level" (e.g. two normal top level windows, or two utility windows) and will not
           work across them. The splashscreen is on its own "StatusWindowLevel" so restacking
           is not going to work.

           So for OS X, we just hide ourselves.

           Oct 2014: The Windows situation is similar, although it should be possible
           to play tricks with gdk's set_type_hint() or directly hack things using
           SetWindowLong() and UpdateLayeredWindow()
        */
        (void) win;
        hide();
#else
	set_keep_above (false);
	get_window()->restack (win.get_window(), false);
#endif
}

void
Splash::pop_front ()
{

#if defined  __APPLE__ || defined PLATFORM_WINDOWS
        if (get_window()) {
                show ();
        }
#endif
}

void
Splash::on_realize ()
{
	Window::on_realize ();
	get_window()->set_decorations (Gdk::WMDecoration(0));
	layout->set_font_description (get_style()->get_font());
}

bool
Splash::on_button_release_event (GdkEventButton* ev)
{
	RefPtr<Gdk::Window> window = get_window();

        if (!window || ev->window != window->gobj()) {
                return false;
        }

	hide ();
	return true;
}

bool
Splash::expose (GdkEventExpose* ev)
{
	RefPtr<Gdk::Window> window = darea.get_window();

	/* note: height & width need to be constrained to the pixbuf size
	   in case a WM provides us with a screwy allocation
	*/

	window->draw_pixbuf (get_style()->get_bg_gc (STATE_NORMAL), pixbuf,
			     ev->area.x, ev->area.y,
			     ev->area.x, ev->area.y,
			     min ((pixbuf->get_width() - ev->area.x), ev->area.width),
			     min ((pixbuf->get_height() - ev->area.y), ev->area.height),
			     Gdk::RGB_DITHER_NONE, 0, 0);

	Glib::RefPtr<Gtk::Style> style = darea.get_style();
	Glib::RefPtr<Gdk::GC> white = style->get_white_gc();

	window->draw_layout (white, 10, pixbuf->get_height() - 30, layout);

	/* this must execute AFTER the GDK idle update mechanism
	 */

	if (expose_is_the_one) {
		Glib::signal_idle().connect (sigc::mem_fun (this, &Splash::idle_after_expose),
					     GDK_PRIORITY_REDRAW+2);
	}

	return true;
}

void
Splash::boot_message (std::string msg)
{
	message (msg);
}

bool
Splash::idle_after_expose ()
{
        expose_done = true;
	return false;
}

void
Splash::display ()
{
	bool was_mapped = is_mapped ();

	if (!was_mapped) {
		expose_done = false;
		expose_is_the_one = false;
	}

	pop_front ();
	present ();

	if (!was_mapped) {
		while (!expose_done) {
			gtk_main_iteration ();
		}
		gdk_display_flush (gdk_display_get_default());
	}
}

void
Splash::message (const string& msg)
{
	string str ("<b>");
	str += Gtkmm2ext::markup_escape_text (msg);
	str += "</b>";

        show ();

	layout->set_markup (str);
	Glib::RefPtr<Gdk::Window> win = darea.get_window();

	if (win) {
                expose_done = false;

		if (win->is_visible ()) {
			win->invalidate_rect (Gdk::Rectangle (0, darea.get_height() - 30, darea.get_width(), 30), true);
		} else {
			darea.queue_draw ();
		}
	}
}

bool
Splash::on_map_event (GdkEventAny* ev)
{
	expose_is_the_one = true;
	return Window::on_map_event (ev);
}