/*
 * Copyright (c) 2009-2016, Albertas Vyšniauskas
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:
 *
 *     * Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution.
 *     * Neither the name of the software author nor the names of its contributors may be used to endorse or promote products derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS
 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
 * IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
 * OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include "LayoutPreview.h"
#include "../layout/System.h"
#include "../transformation/Chain.h"
#include "../Rect2.h"
#include <list>
#include <typeinfo>
using namespace std;
using namespace math;
using namespace layout;

#define GET_PRIVATE(obj) (G_TYPE_INSTANCE_GET_PRIVATE((obj), GTK_TYPE_LAYOUT_PREVIEW, GtkLayoutPreviewPrivate))
G_DEFINE_TYPE(GtkLayoutPreview, gtk_layout_preview, GTK_TYPE_DRAWING_AREA);
static gboolean button_release(GtkWidget *layout_preview, GdkEventButton *event);
static gboolean button_press(GtkWidget *layout_preview, GdkEventButton *event);
#if GTK_MAJOR_VERSION >= 3
static gboolean draw(GtkWidget *widget, cairo_t *cr);
#else
static gboolean expose(GtkWidget *layout_preview, GdkEventExpose *event);
#endif
enum
{
	COLOR_CHANGED,
	EMPTY,
	LAST_SIGNAL
};
static guint signals[LAST_SIGNAL] = {};
struct GtkLayoutPreviewPrivate
{
	System *system;
	Rect2<float> area;
	Style* selected_style;
	Box* selected_box;
	transformation::Chain *transformation_chain;
};
static void gtk_layout_preview_class_init(GtkLayoutPreviewClass *klass)
{
	GObjectClass *obj_class = G_OBJECT_CLASS(klass);
	g_type_class_add_private(obj_class, sizeof(GtkLayoutPreviewPrivate));
	GtkWidgetClass *widget_class = GTK_WIDGET_CLASS(klass);
	widget_class->button_release_event = button_release;
	widget_class->button_press_event = button_press;
#if GTK_MAJOR_VERSION >= 3
	widget_class->draw = draw;
#else
	widget_class->expose_event = expose;
#endif
	signals[COLOR_CHANGED] = g_signal_new("color_changed", G_OBJECT_CLASS_TYPE(obj_class), G_SIGNAL_RUN_FIRST, G_STRUCT_OFFSET(GtkLayoutPreviewClass, color_changed), nullptr, nullptr, g_cclosure_marshal_VOID__POINTER, G_TYPE_NONE, 1, G_TYPE_POINTER);
}
static void gtk_layout_preview_init(GtkLayoutPreview *layout_preview)
{
	gtk_widget_add_events(GTK_WIDGET(layout_preview), GDK_2BUTTON_PRESS | GDK_BUTTON_PRESS_MASK | GDK_BUTTON_RELEASE_MASK | GDK_FOCUS_CHANGE_MASK | GDK_KEY_PRESS_MASK | GDK_KEY_RELEASE_MASK);
}
static void destroy(GtkLayoutPreview *widget)
{
	GtkLayoutPreviewPrivate *ns = GET_PRIVATE(widget);
	if (ns->system) System::unref(ns->system);
}
GtkWidget* gtk_layout_preview_new()
{
	GtkWidget* widget = (GtkWidget*)g_object_new(GTK_TYPE_LAYOUT_PREVIEW, nullptr);
	GtkLayoutPreviewPrivate *ns = GET_PRIVATE(widget);
	ns->area = Rect2<float>(0, 0, 1, 1);
	ns->selected_style = nullptr;
	ns->selected_box = nullptr;
	ns->system = nullptr;
	ns->transformation_chain = nullptr;
	g_signal_connect(G_OBJECT(widget), "destroy", G_CALLBACK(destroy), nullptr);
	gtk_widget_set_can_focus(widget, true);
	return widget;
}
static bool set_selected_box(GtkLayoutPreviewPrivate *ns, Box* box)
{
	bool changed = false;
	if (box && box->style){
		if (ns->selected_style) ns->selected_style->SetState(false, 0);
		ns->selected_style = box->style;
		ns->selected_style->SetState(true, box);
		if (ns->selected_box != box) changed=true;
		ns->selected_box = box;
	}else{
		if (ns->selected_style){
			ns->selected_style->SetState(false, 0);
			changed = true;
		}
		ns->selected_style = 0;
		ns->selected_box = 0;
	}
	return changed;
}
static gboolean draw(GtkWidget *widget, cairo_t *cr)
{
	GtkLayoutPreviewPrivate *ns = GET_PRIVATE(widget);
	if (ns->system && ns->system->box){
		ns->area = Rect2<float>(0, 0, 1, 1);
		layout::Context context(cr, ns->transformation_chain);
		ns->system->box->Draw(&context, ns->area);
	}
	return true;
}
#if GTK_MAJOR_VERSION < 3
static gboolean expose(GtkWidget *widget, GdkEventExpose *event)
{
	GtkLayoutPreviewPrivate *ns = GET_PRIVATE(widget);
	cairo_t *cr = gdk_cairo_create(gtk_widget_get_window(widget));
	cairo_rectangle(cr, event->area.x, event->area.y, event->area.width, event->area.height);
	cairo_clip(cr);
	gboolean result = draw(widget, cr);
	cairo_destroy(cr);
	return result;
}
#endif
static gboolean button_release(GtkWidget *layout_preview, GdkEventButton *event){
	return true;
}
static gboolean button_press(GtkWidget *widget, GdkEventButton *event)
{
	gtk_widget_grab_focus(widget);
	GtkLayoutPreviewPrivate *ns = GET_PRIVATE(widget);
	if (ns->system){
		Vec2<float> point = Vec2<float>((event->x-ns->area.getX()) / ns->area.getWidth(), (event->y-ns->area.getY()) / ns->area.getHeight());
		if (set_selected_box(ns, ns->system->GetBoxAt(point))){
			gtk_widget_queue_draw(GTK_WIDGET(widget));
		}
	}
	return false;
}
int gtk_layout_preview_set_system(GtkLayoutPreview* widget, System* system)
{
	GtkLayoutPreviewPrivate *ns = GET_PRIVATE(widget);
	if (ns->system){
		System::unref(ns->system);
	}
	if (system){
		ns->system = static_cast<System*>(system->ref());
		if (ns->system->box)
			gtk_widget_set_size_request(GTK_WIDGET(widget), ns->system->box->rect.getWidth(), ns->system->box->rect.getHeight());
	}else ns->system = 0;
	return 0;
}
int gtk_layout_preview_set_color_at(GtkLayoutPreview* widget, Color* color, gdouble x, gdouble y)
{
	GtkLayoutPreviewPrivate *ns = GET_PRIVATE(widget);
	if (!ns->system) return -1;
	Vec2<float> point = Vec2<float>((x-ns->area.getX()) / ns->area.getWidth(), (y-ns->area.getY()) / ns->area.getHeight());
	Box* box = ns->system->GetBoxAt(point);
	if (box && box->style && !box->locked){
		color_copy(color, &box->style->color);
		gtk_widget_queue_draw(GTK_WIDGET(widget));
		return 0;
	}
	return -1;
}
int gtk_layout_preview_set_color_named(GtkLayoutPreview* widget, Color* color, const char *name)
{
	GtkLayoutPreviewPrivate *ns = GET_PRIVATE(widget);
	if (!ns->system) return -1;
	Box* box = ns->system->GetNamedBox(name);
	if (box && box->style && !box->locked){
		color_copy(color, &box->style->color);
		gtk_widget_queue_draw(GTK_WIDGET(widget));
		return 0;
	}
	return -1;
}
int gtk_layout_preview_set_focus_named(GtkLayoutPreview* widget, const char *name)
{
	GtkLayoutPreviewPrivate *ns = GET_PRIVATE(widget);
	if (!ns->system) return -1;
	Box* box;
	if (set_selected_box(ns, box = ns->system->GetNamedBox(name))){
		gtk_widget_queue_draw(GTK_WIDGET(widget));
		return (box)?(0):(-1);
	}
	return -1;
}
int gtk_layout_preview_set_focus_at(GtkLayoutPreview* widget, gdouble x, gdouble y)
{
	GtkLayoutPreviewPrivate *ns = GET_PRIVATE(widget);
	if (!ns->system) return -1;
	Vec2<float> point = Vec2<float>((x-ns->area.getX()) / ns->area.getWidth(), (y-ns->area.getY()) / ns->area.getHeight());
	Box* box;
	if (set_selected_box(ns, box = ns->system->GetBoxAt(point))){
		gtk_widget_queue_draw(GTK_WIDGET(widget));
		return (box)?(0):(-1);
	}
	return -1;
}
int gtk_layout_preview_get_current_style(GtkLayoutPreview* widget, Style** style)
{
	GtkLayoutPreviewPrivate *ns = GET_PRIVATE(widget);
	if (ns->system && ns->selected_style){
		*style = ns->selected_style;
		return 0;
	}
	return -1;
}
int gtk_layout_preview_get_current_color(GtkLayoutPreview* widget, Color* color)
{
	GtkLayoutPreviewPrivate *ns = GET_PRIVATE(widget);
	if (ns->system && ns->selected_style){
		Box* box = ns->selected_box;
		color_copy(&box->style->color, color);
		return 0;
	}
	return -1;
}
int gtk_layout_preview_set_current_color(GtkLayoutPreview* widget, Color* color)
{
	GtkLayoutPreviewPrivate *ns = GET_PRIVATE(widget);
	if (ns->system && ns->selected_style && !ns->selected_box->locked){
		Box* box = ns->selected_box;
		color_copy(color, &box->style->color);
		gtk_widget_queue_draw(GTK_WIDGET(widget));
		return 0;
	}
	return -1;
}
bool gtk_layout_preview_is_selected(GtkLayoutPreview* widget)
{
	GtkLayoutPreviewPrivate *ns = GET_PRIVATE(widget);
	if (ns->system && ns->selected_style && ns->selected_box){
		return true;
	}
	return false;
}
bool gtk_layout_preview_is_editable(GtkLayoutPreview* widget)
{
	GtkLayoutPreviewPrivate *ns = GET_PRIVATE(widget);
	if (ns->system && ns->selected_style && ns->selected_box){
		return !ns->selected_box->locked;
	}
	return false;
}
void gtk_layout_preview_set_transformation_chain(GtkLayoutPreview* widget, transformation::Chain *chain)
{
	GtkLayoutPreviewPrivate *ns = GET_PRIVATE(widget);
	ns->transformation_chain = chain;
	gtk_widget_queue_draw(GTK_WIDGET(widget));
}