/*
    Copyright (C) 2000 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 <climits>
#include <cerrno>
#include <cmath>
#include <string>

#include <pbd/stl_delete.h>
#include <pbd/xml++.h>
#include <pbd/failed_constructor.h>

#include <gtkmm/widget.h>
#include <gtkmm2ext/click_box.h>
#include <gtkmm2ext/fastmeter.h>
#include <gtkmm2ext/barcontroller.h>
#include <gtkmm2ext/utils.h>
#include <gtkmm2ext/doi.h>
#include <gtkmm2ext/slider_controller.h>

#include <midi++/manager.h>

#include <ardour/plugin.h>
#include <ardour/insert.h>
#include <ardour/ladspa_plugin.h>
#ifdef VST_SUPPORT
#include <ardour/vst_plugin.h>
#endif
#ifdef HAVE_LV2
#include <ardour/lv2_plugin.h>
#include "lv2_plugin_ui.h"
#endif

#include <lrdf.h>

#include "ardour_ui.h"
#include "prompter.h"
#include "plugin_ui.h"
#include "utils.h"
#include "gui_thread.h"
#include "public_editor.h"
#include "keyboard.h"

#include "i18n.h"

using namespace std;
using namespace ARDOUR;
using namespace PBD;
using namespace Gtkmm2ext;
using namespace Gtk;
using namespace sigc;

PluginUIWindow::PluginUIWindow (Gtk::Window* win, boost::shared_ptr<PluginInsert> insert, bool scrollable)
	: parent (win)
{
	bool have_gui = false;
	non_gtk_gui = false;
	was_visible = false;

	if (insert->plugin()->has_editor()) {
		switch (insert->type()) {
		case ARDOUR::VST:
			have_gui = create_vst_editor (insert);
			break;

		case ARDOUR::AudioUnit:
			have_gui = create_audiounit_editor (insert);
			break;
			
		case ARDOUR::LADSPA:
			error << _("Eh? LADSPA plugins don't have editors!") << endmsg;
			break;

		case ARDOUR::LV2:
			have_gui = create_lv2_editor (insert);
			break;

		default:
#ifndef VST_SUPPORT
			error << _("unknown type of editor-supplying plugin (note: no VST support in this version of ardour)")
			      << endmsg;
#else
			error << _("unknown type of editor-supplying plugin")
			      << endmsg;
#endif
			throw failed_constructor ();
		}

	} 

	if (!have_gui) {

		GenericPluginUI*  pu  = new GenericPluginUI (insert, scrollable);
		
		_pluginui = pu;
		add (*pu);
		
		set_wmclass (X_("ardour_plugin_editor"), "Ardour");

		signal_map_event().connect (mem_fun (*pu, &GenericPluginUI::start_updating));
		signal_unmap_event().connect (mem_fun (*pu, &GenericPluginUI::stop_updating));
	}

	// set_position (Gtk::WIN_POS_MOUSE);
	set_name ("PluginEditor");
	add_events (Gdk::KEY_PRESS_MASK|Gdk::KEY_RELEASE_MASK|Gdk::BUTTON_PRESS_MASK|Gdk::BUTTON_RELEASE_MASK);

	signal_delete_event().connect (bind (sigc::ptr_fun (just_hide_it), reinterpret_cast<Window*> (this)), false);
	death_connection = insert->GoingAway.connect (mem_fun(*this, &PluginUIWindow::plugin_going_away));

	gint h = _pluginui->get_preferred_height ();
	gint w = _pluginui->get_preferred_width ();

	if (scrollable) {
		if (h > 600) h = 600;
		if (w > 600) w = 600;

		if (w < 0) {
			w = 450;
		}
	}

	set_default_size (w, h); 
}

PluginUIWindow::~PluginUIWindow ()
{
	delete _pluginui;
}

void
PluginUIWindow::set_parent (Gtk::Window* win)
{
	parent = win;
}

void
PluginUIWindow::on_map ()
{
	Window::on_map ();
	set_keep_above (true);
}

bool
PluginUIWindow::on_enter_notify_event (GdkEventCrossing *ev)
{
	Keyboard::the_keyboard().enter_window (ev, this);
	return false;
}

bool
PluginUIWindow::on_leave_notify_event (GdkEventCrossing *ev)
{
	Keyboard::the_keyboard().leave_window (ev, this);
	return false;
}

bool
PluginUIWindow::on_focus_in_event (GdkEventFocus *ev)
{
	Window::on_focus_in_event (ev);
	//Keyboard::the_keyboard().magic_widget_grab_focus ();
	return false;
}

bool
PluginUIWindow::on_focus_out_event (GdkEventFocus *ev)
{
	Window::on_focus_out_event (ev);
	//Keyboard::the_keyboard().magic_widget_drop_focus ();
	return false;
}

void
PluginUIWindow::on_show ()
{
	set_role("plugin_ui");

	if (_pluginui) {
		_pluginui->update_presets ();
	}

	if (_pluginui) {
		if (_pluginui->on_window_show (_title)) {
			Window::on_show ();
		}
	}

	if (parent) {
		// set_transient_for (*parent);
	}
}

void
PluginUIWindow::on_hide ()
{
	Window::on_hide ();

	if (_pluginui) {
		_pluginui->on_window_hide ();
	}
}

void
PluginUIWindow::set_title(const Glib::ustring& title)
{
	//cout << "PluginUIWindow::set_title(\"" << title << "\"" << endl;
	Gtk::Window::set_title(title);
	_title = title;
}

bool
PluginUIWindow::create_vst_editor(boost::shared_ptr<PluginInsert> insert)
{
#ifndef VST_SUPPORT
	return false;
#else

	boost::shared_ptr<VSTPlugin> vp;

	if ((vp = boost::dynamic_pointer_cast<VSTPlugin> (insert->plugin())) == 0) {
		error << _("unknown type of editor-supplying plugin (note: no VST support in this version of ardour)")
			      << endmsg;
		throw failed_constructor ();
	} else {
		VSTPluginUI* vpu = new VSTPluginUI (insert, vp);
	
		_pluginui = vpu;
		add (*vpu);
		vpu->package (*this);
	}

	non_gtk_gui = true;
	return true;
#endif
}

bool
PluginUIWindow::create_audiounit_editor (boost::shared_ptr<PluginInsert> insert)
{
#if !defined(HAVE_AUDIOUNITS) || !defined(GTKOSX)
	return false;
#else
	VBox* box;
	_pluginui = create_au_gui (insert, &box);
	add (*box);
	non_gtk_gui = true;

	extern sigc::signal<void,bool> ApplicationActivationChanged;
	ApplicationActivationChanged.connect (mem_fun (*this, &PluginUIWindow::app_activated));

	return true;
#endif
}

void
PluginUIWindow::app_activated (bool yn)
{
#if defined (HAVE_AUDIOUNITS) && defined(GTKOSX)
	cerr << "APP activated ? " << yn << endl;
	if (_pluginui) {
		if (yn) {
			if (was_visible) {
				_pluginui->activate ();
				present ();
				was_visible = true;
			}
		} else {
			was_visible = is_visible();
			hide ();
			_pluginui->deactivate ();
		}
	} 
#endif
}

bool
PluginUIWindow::create_lv2_editor(boost::shared_ptr<PluginInsert> insert)
{
#ifndef HAVE_LV2
	return false;
#else

	boost::shared_ptr<LV2Plugin> vp;
	
	if ((vp = boost::dynamic_pointer_cast<LV2Plugin> (insert->plugin())) == 0) {
		error << _("create_lv2_editor called on non-LV2 plugin") << endmsg;
		throw failed_constructor ();
	} else {
		LV2PluginUI* lpu = new LV2PluginUI (insert, vp);
		_pluginui = lpu;
		add (*lpu);
		lpu->package (*this);
	}

	non_gtk_gui = false;
	return true;
#endif
}

bool
PluginUIWindow::on_key_press_event (GdkEventKey* event)
{
	return relay_key_press (event, this);
}

bool
PluginUIWindow::on_key_release_event (GdkEventKey* event)
{
	return true;
}

void
PluginUIWindow::plugin_going_away ()
{
	ENSURE_GUI_THREAD(mem_fun(*this, &PluginUIWindow::plugin_going_away));

	if (_pluginui) {
		_pluginui->stop_updating(0);
	}
	
	death_connection.disconnect ();
	delete_when_idle (this);
}

PlugUIBase::PlugUIBase (boost::shared_ptr<PluginInsert> pi)
	: insert (pi),
	  plugin (insert->plugin()),
	  save_button(_("Save")),
	  bypass_button (_("Bypass"))
{
        //preset_combo.set_use_arrows_always(true);
	preset_combo.set_size_request (100, -1);
	update_presets ();

	preset_combo.signal_changed().connect(mem_fun(*this, &PlugUIBase::setting_selected));
	no_load_preset = false;

	save_button.set_name ("PluginSaveButton");
	save_button.signal_clicked().connect(mem_fun(*this, &PlugUIBase::save_plugin_setting));

	insert->active_changed.connect (mem_fun(*this, &PlugUIBase::redirect_active_changed));
	bypass_button.set_active (!pi->active());

	bypass_button.set_name ("PluginBypassButton");
	bypass_button.signal_toggled().connect (mem_fun(*this, &PlugUIBase::bypass_toggled));
	focus_button.add_events (Gdk::ENTER_NOTIFY_MASK|Gdk::LEAVE_NOTIFY_MASK);

	focus_button.signal_button_release_event().connect (mem_fun(*this, &PlugUIBase::focus_toggled));
	focus_button.add_events (Gdk::ENTER_NOTIFY_MASK|Gdk::LEAVE_NOTIFY_MASK);

	/* these images are not managed, so that we can remove them at will */

	focus_out_image = new Image (get_icon (X_("computer_keyboard")));
	focus_in_image = new Image (get_icon (X_("computer_keyboard_active")));
	
	focus_button.add (*focus_out_image);

	ARDOUR_UI::instance()->set_tip (&focus_button, _("Click to allow the plugin to receive keyboard events that Ardour would normally use as a shortcut"), "");
	ARDOUR_UI::instance()->set_tip (&bypass_button, _("Click to enable/disable this plugin"), "");

	insert->GoingAway.connect (mem_fun (*this, &PlugUIBase::plugin_going_away));
}

PlugUIBase::~PlugUIBase ()
{
}

void
PlugUIBase::plugin_going_away ()
{
	/* drop references to the plugin/insert */
	insert.reset ();
	plugin.reset ();
}

void
PlugUIBase::redirect_active_changed (Redirect* r, void* src)
{
	ENSURE_GUI_THREAD(bind (mem_fun(*this, &PlugUIBase::redirect_active_changed), r, src));
	bypass_button.set_active (!r->active());
}

void
PlugUIBase::setting_selected()
{
	if (no_load_preset) {
		return;
	}
	
	if (preset_combo.get_active_text().length() > 0) {
		if (!plugin->load_preset(preset_combo.get_active_text())) {
			warning << string_compose(_("Plugin preset %1 not found"), preset_combo.get_active_text()) << endmsg;
		}
	}
}

void
PlugUIBase::save_plugin_setting ()
{
	ArdourPrompter prompter (true);
	prompter.set_prompt(_("Name of New Preset:"));
	prompter.add_button (Gtk::Stock::ADD, Gtk::RESPONSE_ACCEPT);
	prompter.set_response_sensitive (Gtk::RESPONSE_ACCEPT, false);
	prompter.set_type_hint (Gdk::WINDOW_TYPE_HINT_UTILITY);

	prompter.show_all();
	prompter.present ();

	switch (prompter.run ()) {
	case Gtk::RESPONSE_ACCEPT:

		string name;

		prompter.get_result(name);

		if (name.length()) {
			if (plugin->save_preset(name)) {

				/* a rather inefficient way to add the newly saved preset
				   to the list.
				*/

				set_popdown_strings (preset_combo, plugin->get_presets());
				no_load_preset = true;
				preset_combo.set_active_text (name);
				no_load_preset = false;
			}
		}
		break;
	}
}

void
PlugUIBase::bypass_toggled ()
{
	bool x;

	if ((x = bypass_button.get_active()) == insert->active()) {
		insert->set_active (!x, this);
	}
}

bool
PlugUIBase::focus_toggled (GdkEventButton* ev)
{
	if (Keyboard::the_keyboard().some_magic_widget_has_focus()) {
		Keyboard::the_keyboard().magic_widget_drop_focus();
		focus_button.remove ();
		focus_button.add (*focus_out_image);
		focus_out_image->show ();
		ARDOUR_UI::instance()->set_tip (&focus_button, _("Click to allow the plugin to receive keyboard events that Ardour would normally use as a shortcut"), "");
	} else {
		Keyboard::the_keyboard().magic_widget_grab_focus();
		focus_button.remove ();
		focus_button.add (*focus_in_image);
		focus_in_image->show ();
		ARDOUR_UI::instance()->set_tip (&focus_button, _("Click to allow normal use of Ardour keyboard shortcuts"), "");
	}

	return true;
}

void
PlugUIBase::update_presets ()
{
	vector<string> presets = plugin->get_presets();
	set_popdown_strings (preset_combo, plugin->get_presets());

	string current_preset = plugin->current_preset();

	if (!current_preset.empty()) {
		for (vector<string>::iterator p = presets.begin(); p != presets.end(); ++p) {
			if (*p == current_preset) {
				preset_combo.set_active_text (current_preset);
			}
		}
	}
}