/*
   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 "grid.h"

#include <math.h>
#include <vector>
#include <algorithm>

#include "preferencesystem.h"

#include "gtkutil/widget.h"
#include "signal/signal.h"
#include "stringio.h"

#include "gtkmisc.h"
#include "commands.h"
#include "preferences.h"



Signal0 g_gridChange_callbacks;

void AddGridChangeCallback( const SignalHandler& handler ){
	g_gridChange_callbacks.connectLast( handler );
	handler();
}

void GridChangeNotify(){
	g_gridChange_callbacks();
}

enum GridPower
{
	GRIDPOWER_0125 = -3,
	GRIDPOWER_025 = -2,
	GRIDPOWER_05 = -1,
	GRIDPOWER_1 = 0,
	GRIDPOWER_2 = 1,
	GRIDPOWER_4 = 2,
	GRIDPOWER_8 = 3,
	GRIDPOWER_16 = 4,
	GRIDPOWER_32 = 5,
	GRIDPOWER_64 = 6,
	GRIDPOWER_128 = 7,
	GRIDPOWER_256 = 8,
};


typedef const char* GridName;
// this must match the GridPower enumeration
const GridName g_gridnames[] = {
	"0.125",
	"0.25",
	"0.5",
	"1",
	"2",
	"4",
	"8",
	"16",
	"32",
	"64",
	"128",
	"256",
};

inline GridPower GridPower_forGridDefault( int gridDefault ){
	return static_cast<GridPower>( gridDefault - 3 );
}

inline int GridDefault_forGridPower( GridPower gridPower ){
	return gridPower + 3;
}

int g_grid_default = GridDefault_forGridPower( GRIDPOWER_8 );

int g_grid_power = GridPower_forGridDefault( g_grid_default );

bool g_grid_snap = true;

int Grid_getPower(){
	return g_grid_power;
}

inline float GridSize_forGridPower( int gridPower ){
	return pow( 2.0f, gridPower );
}

float g_gridsize = GridSize_forGridPower( g_grid_power );

float GetSnapGridSize(){
	return g_grid_snap ? g_gridsize : 0;
}

float GetGridSize(){
	return g_gridsize;
}


void setGridPower( GridPower power );

class GridMenuItem
{
GridPower m_id;

GridMenuItem( const GridMenuItem& other ); // NOT COPYABLE
GridMenuItem& operator=( const GridMenuItem& other ); // NOT ASSIGNABLE
public:
ToggleItem m_item;

GridMenuItem( GridPower id ) : m_id( id ), m_item( ExportCaller( *this ) ){
}
void set(){
	g_grid_power = m_id;
	m_item.update();
	setGridPower( m_id );
}
typedef MemberCaller<GridMenuItem, &GridMenuItem::set> SetCaller;
void active( const BoolImportCallback& importCallback ){
	importCallback( g_grid_power == m_id );
}
typedef MemberCaller1<GridMenuItem, const BoolImportCallback&, &GridMenuItem::active> ExportCaller;
};

GridMenuItem g_gridMenu0125( GRIDPOWER_0125 );
GridMenuItem g_gridMenu025( GRIDPOWER_025 );
GridMenuItem g_gridMenu05( GRIDPOWER_05 );
GridMenuItem g_gridMenu1( GRIDPOWER_1 );
GridMenuItem g_gridMenu2( GRIDPOWER_2 );
GridMenuItem g_gridMenu4( GRIDPOWER_4 );
GridMenuItem g_gridMenu8( GRIDPOWER_8 );
GridMenuItem g_gridMenu16( GRIDPOWER_16 );
GridMenuItem g_gridMenu32( GRIDPOWER_32 );
GridMenuItem g_gridMenu64( GRIDPOWER_64 );
GridMenuItem g_gridMenu128( GRIDPOWER_128 );
GridMenuItem g_gridMenu256( GRIDPOWER_256 );

void setGridPower( GridPower power ){
	g_grid_snap = true;
	g_gridsize = GridSize_forGridPower( power );

	g_gridMenu0125.m_item.update();
	g_gridMenu025.m_item.update();
	g_gridMenu05.m_item.update();
	g_gridMenu1.m_item.update();
	g_gridMenu2.m_item.update();
	g_gridMenu4.m_item.update();
	g_gridMenu8.m_item.update();
	g_gridMenu16.m_item.update();
	g_gridMenu32.m_item.update();
	g_gridMenu64.m_item.update();
	g_gridMenu128.m_item.update();
	g_gridMenu256.m_item.update();
	GridChangeNotify();
}

void GridPrev(){
	g_grid_snap = true;
	if ( g_grid_power > GRIDPOWER_0125 ) {
		setGridPower( static_cast<GridPower>( --g_grid_power ) );
	}
}

void GridNext(){
	g_grid_snap = true;
	if ( g_grid_power < GRIDPOWER_256 ) {
		setGridPower( static_cast<GridPower>( ++g_grid_power ) );
	}
}

void ToggleGridSnap(){
	g_grid_snap = !g_grid_snap;
	GridChangeNotify();
}

void Grid_registerCommands(){
	GlobalCommands_insert( "GridDown", FreeCaller<GridPrev>(), Accelerator( '[' ) );
	GlobalCommands_insert( "GridUp", FreeCaller<GridNext>(), Accelerator( ']' ) );

	GlobalCommands_insert( "ToggleGridSnap", FreeCaller<ToggleGridSnap>() );

	GlobalToggles_insert( "SetGrid0.125", GridMenuItem::SetCaller( g_gridMenu0125 ), ToggleItem::AddCallbackCaller( g_gridMenu0125.m_item ) );
	GlobalToggles_insert( "SetGrid0.25", GridMenuItem::SetCaller( g_gridMenu025 ), ToggleItem::AddCallbackCaller( g_gridMenu025.m_item ) );
	GlobalToggles_insert( "SetGrid0.5", GridMenuItem::SetCaller( g_gridMenu05 ), ToggleItem::AddCallbackCaller( g_gridMenu05.m_item ) );
	GlobalToggles_insert( "SetGrid1", GridMenuItem::SetCaller( g_gridMenu1 ), ToggleItem::AddCallbackCaller( g_gridMenu1.m_item ), Accelerator( '1' ) );
	GlobalToggles_insert( "SetGrid2", GridMenuItem::SetCaller( g_gridMenu2 ), ToggleItem::AddCallbackCaller( g_gridMenu2.m_item ), Accelerator( '2' ) );
	GlobalToggles_insert( "SetGrid4", GridMenuItem::SetCaller( g_gridMenu4 ), ToggleItem::AddCallbackCaller( g_gridMenu4.m_item ), Accelerator( '3' ) );
	GlobalToggles_insert( "SetGrid8", GridMenuItem::SetCaller( g_gridMenu8 ), ToggleItem::AddCallbackCaller( g_gridMenu8.m_item ), Accelerator( '4' ) );
	GlobalToggles_insert( "SetGrid16", GridMenuItem::SetCaller( g_gridMenu16 ), ToggleItem::AddCallbackCaller( g_gridMenu16.m_item ), Accelerator( '5' ) );
	GlobalToggles_insert( "SetGrid32", GridMenuItem::SetCaller( g_gridMenu32 ), ToggleItem::AddCallbackCaller( g_gridMenu32.m_item ), Accelerator( '6' ) );
	GlobalToggles_insert( "SetGrid64", GridMenuItem::SetCaller( g_gridMenu64 ), ToggleItem::AddCallbackCaller( g_gridMenu64.m_item ), Accelerator( '7' ) );
	GlobalToggles_insert( "SetGrid128", GridMenuItem::SetCaller( g_gridMenu128 ), ToggleItem::AddCallbackCaller( g_gridMenu128.m_item ), Accelerator( '8' ) );
	GlobalToggles_insert( "SetGrid256", GridMenuItem::SetCaller( g_gridMenu256 ), ToggleItem::AddCallbackCaller( g_gridMenu256.m_item ), Accelerator( '9' ) );
}


void Grid_constructMenu( GtkMenu* menu ){
	create_check_menu_item_with_mnemonic( menu, "Grid0.125", "SetGrid0.125" );
	create_check_menu_item_with_mnemonic( menu, "Grid0.25", "SetGrid0.25" );
	create_check_menu_item_with_mnemonic( menu, "Grid0.5", "SetGrid0.5" );
	create_check_menu_item_with_mnemonic( menu, "Grid1", "SetGrid1" );
	create_check_menu_item_with_mnemonic( menu, "Grid2", "SetGrid2" );
	create_check_menu_item_with_mnemonic( menu, "Grid4", "SetGrid4" );
	create_check_menu_item_with_mnemonic( menu, "Grid8", "SetGrid8" );
	create_check_menu_item_with_mnemonic( menu, "Grid16", "SetGrid16" );
	create_check_menu_item_with_mnemonic( menu, "Grid32", "SetGrid32" );
	create_check_menu_item_with_mnemonic( menu, "Grid64", "SetGrid64" );
	create_check_menu_item_with_mnemonic( menu, "Grid128", "SetGrid128" );
	create_check_menu_item_with_mnemonic( menu, "Grid256", "SetGrid256" );
}

void Grid_registerShortcuts(){
	command_connect_accelerator( "ToggleGrid" );
	command_connect_accelerator( "GridDown" );
	command_connect_accelerator( "GridUp" );
	command_connect_accelerator( "ToggleGridSnap" );
}

void Grid_constructPreferences( PreferencesPage& page ){
	page.appendCombo(
		"Default grid spacing",
		g_grid_default,
		ARRAY_RANGE( g_gridnames )
		);
}
void Grid_constructPage( PreferenceGroup& group ){
	PreferencesPage page( group.createPage( "Grid", "Grid Settings" ) );
	Grid_constructPreferences( page );
}
void Grid_registerPreferencesPage(){
	PreferencesDialog_addSettingsPage( FreeCaller1<PreferenceGroup&, Grid_constructPage>() );
}

void Grid_construct(){
	Grid_registerPreferencesPage();

	g_grid_default = GridDefault_forGridPower( GRIDPOWER_8 );

	GlobalPreferenceSystem().registerPreference( "GridDefault", IntImportStringCaller( g_grid_default ), IntExportStringCaller( g_grid_default ) );

	g_grid_power = GridPower_forGridDefault( g_grid_default );
	g_gridsize = GridSize_forGridPower( g_grid_power );
}

void Grid_destroy(){
}