/*
   Copyright (C) 2001-2006, William Joseph.
   All Rights Reserved.

   This file is part of GtkRadiant.

   GtkRadiant 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.

   GtkRadiant 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 GtkRadiant; if not, write to the Free Software
   Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 */

#include "windowobservers.h"

#include <vector>
#include <gdk/gdk.h>
#include "generic/bitfield.h"

namespace {
    ModifierFlags g_modifier_state = c_modifierNone;
}

typedef std::vector<WindowObserver *> WindowObservers;

inline void WindowObservers_OnModifierDown(WindowObservers &observers, ModifierFlags type)
{
    g_modifier_state = bitfield_enable(g_modifier_state, type);
    for (WindowObservers::iterator i = observers.begin(); i != observers.end(); ++i) {
        (*i)->onModifierDown(type);
    }
}

inline void WindowObservers_OnModifierUp(WindowObservers &observers, ModifierFlags type)
{
    g_modifier_state = bitfield_disable(g_modifier_state, type);
    for (WindowObservers::iterator i = observers.begin(); i != observers.end(); ++i) {
        (*i)->onModifierUp(type);
    }
}

#include <gdk/gdkkeysyms.h>

gboolean selection_modifier_key_press(ui::Widget widget, GdkEventKey *event, WindowObservers &observers)
{
    switch (event->keyval) {
        case GDK_KEY_Alt_L:
        case GDK_KEY_Alt_R:
            //globalOutputStream() << "Alt PRESSED\n";
            WindowObservers_OnModifierDown(observers, c_modifierAlt);
            break;
        case GDK_KEY_Shift_L:
        case GDK_KEY_Shift_R:
            //globalOutputStream() << "Shift PRESSED\n";
            WindowObservers_OnModifierDown(observers, c_modifierShift);
            break;
        case GDK_KEY_Control_L:
        case GDK_KEY_Control_R:
            //globalOutputStream() << "Control PRESSED\n";
            WindowObservers_OnModifierDown(observers, c_modifierControl);
            break;
    }
    return FALSE;
}

gboolean selection_modifier_key_release(ui::Widget widget, GdkEventKey *event, WindowObservers &observers)
{
    switch (event->keyval) {
        case GDK_KEY_Alt_L:
        case GDK_KEY_Alt_R:
            //globalOutputStream() << "Alt RELEASED\n";
            WindowObservers_OnModifierUp(observers, c_modifierAlt);
            break;
        case GDK_KEY_Shift_L:
        case GDK_KEY_Shift_R:
            //globalOutputStream() << "Shift RELEASED\n";
            WindowObservers_OnModifierUp(observers, c_modifierShift);
            break;
        case GDK_KEY_Control_L:
        case GDK_KEY_Control_R:
            //globalOutputStream() << "Control RELEASED\n";
            WindowObservers_OnModifierUp(observers, c_modifierControl);
            break;
    }
    return FALSE;
}

void WindowObservers_UpdateModifier(WindowObservers &observers, ModifierFlags modifiers, ModifierFlags modifier)
{
    if (!bitfield_enabled(g_modifier_state, modifier) && bitfield_enabled(modifiers, modifier)) {
        WindowObservers_OnModifierDown(observers, modifier);
    }
    if (bitfield_enabled(g_modifier_state, modifier) && !bitfield_enabled(modifiers, modifier)) {
        WindowObservers_OnModifierUp(observers, modifier);
    }
}

void WindowObservers_UpdateModifiers(WindowObservers &observers, ModifierFlags modifiers)
{
    WindowObservers_UpdateModifier(observers, modifiers, c_modifierAlt);
    WindowObservers_UpdateModifier(observers, modifiers, c_modifierShift);
    WindowObservers_UpdateModifier(observers, modifiers, c_modifierControl);
}

gboolean modifiers_button_press(ui::Widget widget, GdkEventButton *event, WindowObservers *observers)
{
    if (event->type == GDK_BUTTON_PRESS) {
        WindowObservers_UpdateModifiers(*observers, modifiers_for_state(event->state));
    }
    return FALSE;
}

gboolean modifiers_button_release(ui::Widget widget, GdkEventButton *event, WindowObservers *observers)
{
    if (event->type == GDK_BUTTON_RELEASE) {
        WindowObservers_UpdateModifiers(*observers, modifiers_for_state(event->state));
    }
    return FALSE;
}

gboolean modifiers_motion(ui::Widget widget, GdkEventMotion *event, WindowObservers *observers)
{
    WindowObservers_UpdateModifiers(*observers, modifiers_for_state(event->state));
    return FALSE;
}


WindowObservers g_window_observers;

void GlobalWindowObservers_updateModifiers(ModifierFlags modifiers)
{
    WindowObservers_UpdateModifiers(g_window_observers, modifiers);
}

void GlobalWindowObservers_add(WindowObserver *observer)
{
    g_window_observers.push_back(observer);
}

void GlobalWindowObservers_connectTopLevel(ui::Window window)
{
    window.connect("key_press_event", G_CALLBACK(selection_modifier_key_press), &g_window_observers);
    window.connect("key_release_event", G_CALLBACK(selection_modifier_key_release), &g_window_observers);
}

void GlobalWindowObservers_connectWidget(ui::Widget widget)
{
    widget.connect("button_press_event", G_CALLBACK(modifiers_button_press), &g_window_observers);
    widget.connect("button_release_event", G_CALLBACK(modifiers_button_release), &g_window_observers);
    widget.connect("motion_notify_event", G_CALLBACK(modifiers_motion), &g_window_observers);
}

ModifierFlags modifiers_for_state(unsigned int state)
{
    ModifierFlags modifiers = c_modifierNone;
    if (state & GDK_SHIFT_MASK) {
        modifiers |= c_modifierShift;
    }
    if (state & GDK_CONTROL_MASK) {
        modifiers |= c_modifierControl;
    }
    if (state & GDK_MOD1_MASK) {
        modifiers |= c_modifierAlt;
    }
    return modifiers;
}