/** \file dlayer.c
 * Functions and dialogs for handling layers.
 *
 * $Header: /home/dmarkle/xtrkcad-fork-cvs/xtrkcad/app/bin/dlayer.c,v 1.9 2009-06-15 19:29:57 m_fischer Exp $
 */

/*  XTrkCad - Model Railroad CAD
 *  Copyright (C) 2005 Dave Bullis and (C) 2007 Martin Fischer
 *
 *  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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 */

#include <assert.h>

#include "track.h"
#include "i18n.h"

#include <stdint.h>


/*****************************************************************************
 *
 * LAYERS
 *
 */

#define NUM_BUTTONS		(99)
#define LAYERPREF_FROZEN  (1)
#define LAYERPREF_ONMAP	  (2)
#define LAYERPREF_VISIBLE (4)
#define LAYERPREF_SECTION ("Layers")
#define LAYERPREF_NAME 	"name"
#define LAYERPREF_COLOR "color"
#define LAYERPREF_FLAGS "flags"

EXPORT LAYER_T curLayer;
EXPORT long layerCount = 10;
static long newLayerCount = 10;
static LAYER_T layerCurrent = NUM_LAYERS;


static BOOL_T layoutLayerChanged = FALSE;

static wIcon_p show_layer_bmps[NUM_BUTTONS];		
/*static wIcon_p hide_layer_bmps[NUM_BUTTONS]; */
static wButton_p layer_btns[NUM_BUTTONS];	/**< layer buttons on toolbar */

/** Layer selector on toolbar */
static wList_p setLayerL;				

/*static wMessage_p layerNumM;*/
/** Describe the properties of a layer */
typedef struct {
		char name[STR_SHORT_SIZE];		/**< Layer name */
		wDrawColor color;					/**< layer color, is an index into a color table */
		BOOL_T frozen;						/**< Frozen flag */
		BOOL_T visible;					/**< visible flag */
		BOOL_T onMap;						/**< is layer shown map */
		long objCount;						/**< number of objects on layer */
		} layer_t;
		
static layer_t layers[NUM_LAYERS];
static layer_t *layers_save = NULL;


static int oldColorMap[][3] = {
		{ 255, 255, 255 },		/* White */
		{   0,   0,   0 },      /* Black */
		{ 255,   0,   0 },      /* Red */
		{   0, 255,   0 },      /* Green */
		{   0,   0, 255 },      /* Blue */
		{ 255, 255,   0 },      /* Yellow */
		{ 255,   0, 255 },      /* Purple */
		{   0, 255, 255 },      /* Aqua */
		{ 128,   0,   0 },      /* Dk. Red */
		{   0, 128,   0 },      /* Dk. Green */
		{   0,   0, 128 },      /* Dk. Blue */
		{ 128, 128,   0 },      /* Dk. Yellow */
		{ 128,   0, 128 },      /* Dk. Purple */
		{   0, 128, 128 },      /* Dk. Aqua */
		{  65, 105, 225 },      /* Royal Blue */
		{   0, 191, 255 },      /* DeepSkyBlue */
		{ 125, 206, 250 },      /* LightSkyBlue */
		{  70, 130, 180 },      /* Steel Blue */
		{ 176, 224, 230 },      /* Powder Blue */
		{ 127, 255, 212 },      /* Aquamarine */
		{  46, 139,  87 },      /* SeaGreen */
		{ 152, 251, 152 },      /* PaleGreen */
		{ 124, 252,   0 },      /* LawnGreen */
		{  50, 205,  50 },      /* LimeGreen */
		{  34, 139,  34 },      /* ForestGreen */
		{ 255, 215,   0 },      /* Gold */
		{ 188, 143, 143 },      /* RosyBrown */
		{ 139, 69, 19 },        /* SaddleBrown */
		{ 245, 245, 220 },      /* Beige */
		{ 210, 180, 140 },      /* Tan */
		{ 210, 105, 30 },       /* Chocolate */
		{ 165, 42, 42 },        /* Brown */
		{ 255, 165, 0 },        /* Orange */
		{ 255, 127, 80 },       /* Coral */
		{ 255, 99, 71 },        /* Tomato */
		{ 255, 105, 180 },      /* HotPink */
		{ 255, 192, 203 },      /* Pink */
		{ 176, 48, 96 },        /* Maroon */
		{ 238, 130, 238 },      /* Violet */
		{ 160, 32, 240 },       /* Purple */
		{  16,  16,  16 },      /* Gray */
		{  32,  32,  32 },      /* Gray */
		{  48,  48,  48 },      /* Gray */
		{  64,  64,  64 },      /* Gray */
		{  80,  80,  80 },      /* Gray */
		{  96,  96,  96 },      /* Gray */
		{ 112, 112, 122 },      /* Gray */
		{ 128, 128, 128 },      /* Gray */
		{ 144, 144, 144 },      /* Gray */
		{ 160, 160, 160 },      /* Gray */
		{ 176, 176, 176 },      /* Gray */
		{ 192, 192, 192 },      /* Gray */
		{ 208, 208, 208 },      /* Gray */
		{ 224, 224, 224 },      /* Gray */
		{ 240, 240, 240 },      /* Gray */
		{   0,   0,   0 }       /* BlackPixel */
		};

static void DoLayerOp( void * data );
static void UpdateLayerDlg(void);
/* static void LoadLayerLists(); */
static void LayerSetCounts();
static void InitializeLayers( void LayerInitFunc( void ), int newCurrLayer );
static void LayerPrefSave( void );
static void LayerPrefLoad( void );

EXPORT BOOL_T GetLayerVisible( LAYER_T layer )
{
	if (layer < 0 || layer >= NUM_LAYERS)
		return TRUE;
	else
		return layers[(int)layer].visible;
}


EXPORT BOOL_T GetLayerFrozen( LAYER_T layer )
{
	if (layer < 0 || layer >= NUM_LAYERS)
		return TRUE;
	else
		return layers[(int)layer].frozen;
}


EXPORT BOOL_T GetLayerOnMap( LAYER_T layer )
{
	if (layer < 0 || layer >= NUM_LAYERS)
		return TRUE;
	else
		return layers[(int)layer].onMap;
}


EXPORT char * GetLayerName( LAYER_T layer )
{
	if (layer < 0 || layer >= NUM_LAYERS)
		return NULL;
	else
		return layers[(int)layer].name;
}


EXPORT void NewLayer( void )
{
}


EXPORT wDrawColor GetLayerColor( LAYER_T layer )
{
	return layers[(int)layer].color;
}


static void FlipLayer( void * arg )
{
	LAYER_T l = (LAYER_T)(long)arg;
	wBool_t visible;
	if ( l < 0 || l >= NUM_LAYERS )
		return;
	if ( l == curLayer && layers[(int)l].visible) {
		wButtonSetBusy( layer_btns[(int)l], layers[(int)l].visible );
		NoticeMessage( MSG_LAYER_HIDE, _("Ok"), NULL );
		return;
	}
	RedrawLayer( l, FALSE );
	visible = !layers[(int)l].visible;
	layers[(int)l].visible = visible;
	if (l<NUM_BUTTONS) {
		wButtonSetBusy( layer_btns[(int)l], visible != 0 );
		wButtonSetLabel( layer_btns[(int)l], (char *)show_layer_bmps[(int)l]); 
	}
	RedrawLayer( l, TRUE );
}

static void SetCurrLayer( wIndex_t inx, const char * name, wIndex_t op, void * listContext, void * arg )
{
	LAYER_T newLayer = (LAYER_T)(long)inx;
	if (layers[(int)newLayer].frozen) {
		NoticeMessage( MSG_LAYER_SEL_FROZEN, _("Ok"), NULL );
		wListSetIndex( setLayerL, curLayer );
		return;
	}
	curLayer = newLayer;
	
	if ( curLayer < 0 || curLayer >= NUM_LAYERS )
		curLayer = 0;
	if ( !layers[(int)curLayer].visible )
		FlipLayer( (void*)(intptr_t)inx );
	if ( recordF )
		fprintf( recordF, "SETCURRLAYER %d\n", inx );
}

static void PlaybackCurrLayer( char * line )
{
	wIndex_t layer;
	layer = atoi(line);
	wListSetIndex( setLayerL, layer );
	SetCurrLayer( layer, NULL, 0, NULL, NULL );
}

/**
 * Change the color of a layer.
 *
 * \param inx IN layer to change
 * \param color IN new color
 */

static void SetLayerColor( int inx, wDrawColor color )
{
	if ( color != layers[inx].color ) {
		if (inx < NUM_BUTTONS) {
			wIconSetColor( show_layer_bmps[inx], color );
			wButtonSetLabel( layer_btns[inx], (char*)show_layer_bmps[inx] ); 
		}
		layers[inx].color = color;
		layoutLayerChanged = TRUE;
	}
}

 

#include "bitmaps/l1.xbm"
#include "bitmaps/l2.xbm"
#include "bitmaps/l3.xbm"
#include "bitmaps/l4.xbm"
#include "bitmaps/l5.xbm"
#include "bitmaps/l6.xbm"
#include "bitmaps/l7.xbm"
#include "bitmaps/l8.xbm"
#include "bitmaps/l9.xbm"
#include "bitmaps/l10.xbm"
#include "bitmaps/l11.xbm"
#include "bitmaps/l12.xbm"
#include "bitmaps/l13.xbm"
#include "bitmaps/l14.xbm"
#include "bitmaps/l15.xbm"
#include "bitmaps/l16.xbm"
#include "bitmaps/l17.xbm"
#include "bitmaps/l18.xbm"
#include "bitmaps/l19.xbm"
#include "bitmaps/l20.xbm"
#include "bitmaps/l21.xbm"
#include "bitmaps/l22.xbm"
#include "bitmaps/l23.xbm"
#include "bitmaps/l24.xbm"
#include "bitmaps/l25.xbm"
#include "bitmaps/l26.xbm"
#include "bitmaps/l27.xbm"
#include "bitmaps/l28.xbm"
#include "bitmaps/l29.xbm"
#include "bitmaps/l30.xbm"
#include "bitmaps/l31.xbm"
#include "bitmaps/l32.xbm"
#include "bitmaps/l33.xbm"
#include "bitmaps/l34.xbm"
#include "bitmaps/l35.xbm"
#include "bitmaps/l36.xbm"
#include "bitmaps/l37.xbm"
#include "bitmaps/l38.xbm"
#include "bitmaps/l39.xbm"
#include "bitmaps/l40.xbm"
#include "bitmaps/l41.xbm"
#include "bitmaps/l42.xbm"
#include "bitmaps/l43.xbm"
#include "bitmaps/l44.xbm"
#include "bitmaps/l45.xbm"
#include "bitmaps/l46.xbm"
#include "bitmaps/l47.xbm"
#include "bitmaps/l48.xbm"
#include "bitmaps/l49.xbm"
#include "bitmaps/l50.xbm"
#include "bitmaps/l51.xbm"
#include "bitmaps/l52.xbm"
#include "bitmaps/l53.xbm"
#include "bitmaps/l54.xbm"
#include "bitmaps/l55.xbm"
#include "bitmaps/l56.xbm"
#include "bitmaps/l57.xbm"
#include "bitmaps/l58.xbm"
#include "bitmaps/l59.xbm"
#include "bitmaps/l60.xbm"
#include "bitmaps/l61.xbm"
#include "bitmaps/l62.xbm"
#include "bitmaps/l63.xbm"
#include "bitmaps/l64.xbm"
#include "bitmaps/l65.xbm"
#include "bitmaps/l66.xbm"
#include "bitmaps/l67.xbm"
#include "bitmaps/l68.xbm"
#include "bitmaps/l69.xbm"
#include "bitmaps/l70.xbm"
#include "bitmaps/l71.xbm"
#include "bitmaps/l72.xbm"
#include "bitmaps/l73.xbm"
#include "bitmaps/l74.xbm"
#include "bitmaps/l75.xbm"
#include "bitmaps/l76.xbm"
#include "bitmaps/l77.xbm"
#include "bitmaps/l78.xbm"
#include "bitmaps/l79.xbm"
#include "bitmaps/l80.xbm"
#include "bitmaps/l81.xbm"
#include "bitmaps/l82.xbm"
#include "bitmaps/l83.xbm"
#include "bitmaps/l84.xbm"
#include "bitmaps/l85.xbm"
#include "bitmaps/l86.xbm"
#include "bitmaps/l87.xbm"
#include "bitmaps/l88.xbm"
#include "bitmaps/l89.xbm"
#include "bitmaps/l90.xbm"
#include "bitmaps/l91.xbm"
#include "bitmaps/l92.xbm"
#include "bitmaps/l93.xbm"
#include "bitmaps/l94.xbm"
#include "bitmaps/l95.xbm"
#include "bitmaps/l96.xbm"
#include "bitmaps/l97.xbm"
#include "bitmaps/l98.xbm"
#include "bitmaps/l99.xbm"


static char * show_layer_bits[NUM_BUTTONS] = {
 l1_bits, l2_bits, l3_bits, l4_bits, l5_bits, l6_bits, l7_bits, l8_bits, l9_bits, l10_bits,
 l11_bits, l12_bits, l13_bits, l14_bits, l15_bits, l16_bits, l17_bits, l18_bits, l19_bits, l20_bits,
 l21_bits, l22_bits, l23_bits, l24_bits, l25_bits, l26_bits, l27_bits, l28_bits, l29_bits, l30_bits,
 l31_bits, l32_bits, l33_bits, l34_bits, l35_bits, l36_bits, l37_bits, l38_bits, l39_bits, l40_bits,
 l41_bits, l42_bits, l43_bits, l44_bits, l45_bits, l46_bits, l47_bits, l48_bits, l49_bits, l50_bits, 
 l51_bits, l52_bits, l53_bits, l54_bits, l55_bits, l56_bits, l57_bits, l58_bits, l59_bits, l60_bits,
 l61_bits, l62_bits, l63_bits, l64_bits, l65_bits, l66_bits, l67_bits, l68_bits, l69_bits, l70_bits,
 l71_bits, l72_bits, l73_bits, l74_bits, l75_bits, l76_bits, l77_bits, l78_bits, l79_bits, l80_bits,
 l81_bits, l82_bits, l83_bits, l84_bits, l85_bits, l86_bits, l87_bits, l88_bits, l89_bits, l90_bits,
 l91_bits, l92_bits, l93_bits, l94_bits, l95_bits, l96_bits, l97_bits, l98_bits, l99_bits, 
};


static EXPORT long layerRawColorTab[] = {
		wRGB(  0,  0,255),      /* blue */
		wRGB(  0,  0,128),      /* dk blue */
		wRGB(  0,128,  0),      /* dk green */
		wRGB(255,255,  0),      /* yellow */
		wRGB(  0,255,  0),      /* green */
		wRGB(  0,255,255),      /* lt cyan */
		wRGB(128,  0,  0),      /* brown */
		wRGB(128,  0,128),      /* purple */
		wRGB(128,128,  0),      /* green-brown */
		wRGB(255,  0,255)};     /* lt-purple */
static EXPORT wDrawColor layerColorTab[COUNT(layerRawColorTab)];


static wWin_p layerW;
static char layerName[STR_SHORT_SIZE];
static wDrawColor layerColor;
static long layerVisible = TRUE;
static long layerFrozen = FALSE;
static long layerOnMap = TRUE;
static void LayerOk( void * );
static BOOL_T layerRedrawMap = FALSE;

#define ENUMLAYER_RELOAD (1)
#define ENUMLAYER_SAVE	(2)
#define ENUMLAYER_CLEAR (3)

static char *visibleLabels[] = { "", NULL };
static char *frozenLabels[] = { "", NULL };
static char *onMapLabels[] = { "", NULL };
static paramIntegerRange_t i0_20 = { 0, NUM_BUTTONS };

static paramData_t layerPLs[] = {
#define I_LIST	(0)
	 { PD_DROPLIST, NULL, "layer", PDO_LISTINDEX|PDO_DLGNOLABELALIGN, (void*)250 },
#define I_NAME	(1)
	 { PD_STRING, layerName, "name", PDO_NOPREF, (void*)(250-54), N_("Name") },
#define I_COLOR	(2)
	 { PD_COLORLIST, &layerColor, "color", PDO_NOPREF, NULL, N_("Color") },
#define I_VIS	(3)
	 { PD_TOGGLE, &layerVisible, "visible", PDO_NOPREF, visibleLabels, N_("Visible"), BC_HORZ|BC_NOBORDER },
#define I_FRZ	(4)
	 { PD_TOGGLE, &layerFrozen, "frozen", PDO_NOPREF|PDO_DLGHORZ, frozenLabels, N_("Frozen"), BC_HORZ|BC_NOBORDER },
#define I_MAP	(5)
	 { PD_TOGGLE, &layerOnMap, "onmap", PDO_NOPREF|PDO_DLGHORZ, onMapLabels, N_("On Map"), BC_HORZ|BC_NOBORDER },
#define I_COUNT (6)
	 { PD_STRING, NULL, "object-count", PDO_NOPREF|PDO_DLGBOXEND, (void*)(80), N_("Count"), BO_READONLY },
	 { PD_MESSAGE, N_("Personal Preferences"), NULL, PDO_DLGRESETMARGIN, (void *)180 },
	 { PD_BUTTON, (void*)DoLayerOp, "reset", PDO_DLGRESETMARGIN, 0, N_("Load"), 0, (void *)ENUMLAYER_RELOAD },
	 { PD_BUTTON, (void*)DoLayerOp, "save", PDO_DLGHORZ, 0, N_("Save"), 0, (void *)ENUMLAYER_SAVE }, 
	 { PD_BUTTON, (void*)DoLayerOp, "clear", PDO_DLGHORZ | PDO_DLGBOXEND, 0, N_("Defaults"), 0, (void *)ENUMLAYER_CLEAR }, 	 
	 { PD_LONG, &newLayerCount, "button-count", PDO_DLGBOXEND|PDO_DLGRESETMARGIN, &i0_20, N_("Number of Layer Buttons") },	 
};

static paramGroup_t layerPG = { "layer", 0, layerPLs, sizeof layerPLs/sizeof layerPLs[0] };

#define layerL	((wList_p)layerPLs[I_LIST].control)

/**
 * Load the layer settings to hard coded system defaults
 */
 
void
LayerSystemDefaults( void )
{
	int inx;
	
	for ( inx=0;inx<NUM_LAYERS; inx++ ) {
		strcpy( layers[inx].name, inx==0?_("Main"):"" );
		layers[inx].visible = TRUE;
		layers[inx].frozen = FALSE;
		layers[inx].onMap = TRUE;
		layers[inx].objCount = 0;
		SetLayerColor( inx, layerColorTab[inx%COUNT(layerColorTab)] );
	}	
}

/**
 * Load the layer listboxes in Manage Layers and the Toolbar with up-to-date information. 
 */

EXPORT void LoadLayerLists( void )
{
	int inx;
	 
	/* clear both lists */
	wListClear(setLayerL);
	if ( layerL ) 
		wListClear(layerL);

	/* add all layers to both lists */
	for ( inx=0; inx<NUM_LAYERS; inx++ ) {

		if ( layerL ) {
			sprintf( message, "%2d %c %s", inx+1, layers[inx].objCount>0?'+':'-', layers[inx].name );
			wListAddValue( layerL, message, NULL, NULL );
		}
		
		sprintf( message, "%2d : %s", inx+1,  layers[inx].name );
		wListAddValue( setLayerL, message, NULL, NULL );
	}

	/* set current layer to selected */
	wListSetIndex( setLayerL, curLayer );
	if ( layerL ) 
		wListSetIndex( layerL, curLayer );		
}

/**
 * Handle button presses for the layer dialog. For all button presses in the layer
 *	dialog, this function is called. The parameter identifies the button pressed and
 * the operation is performed. 
 *
 * \param[IN] data identifier for the button prerssed
 * \return    
 */

static void DoLayerOp( void * data )
{
	switch((long)data ) {
	
	case ENUMLAYER_CLEAR:
		InitializeLayers( LayerSystemDefaults, -1 );
		break;
	case ENUMLAYER_SAVE:
		LayerPrefSave();	
		break;
	case ENUMLAYER_RELOAD:
		LayerPrefLoad();
		break;	
	}
	
	UpdateLayerDlg();	
	if( layoutLayerChanged ) {
		MainProc( mainW, wResize_e, NULL );
		layoutLayerChanged = FALSE;
		changed = TRUE;
		SetWindowTitle();
	}	
}

/**
 * Update all dialogs and dialog elements after changing layers preferences. Once the global array containing 
 * the settings for the labels has been changed, this function needs to be called to update all the user interface
 * elements to the new settings.
 */

static void 
UpdateLayerDlg()
{
	int inx;
	
	/* update the globals for the layer dialog */
  	layerVisible = layers[curLayer].visible;
	layerFrozen = layers[curLayer].frozen;
	layerOnMap = layers[curLayer].onMap;
	layerColor = layers[curLayer].color;
	strcpy( layerName, layers[curLayer].name );
	layerCurrent = curLayer;
	
	/* now re-load the layer list boxes */
	LoadLayerLists();
	
	sprintf( message, "%ld", layers[curLayer].objCount );
	ParamLoadMessage( &layerPG, I_COUNT, message );

	/* force update of the 'manage layers' dialogbox */
	if( layerL )
		ParamLoadControls( &layerPG );
		
	/* finally show the layer buttons with ballon text */
	for( inx = 0; inx < NUM_BUTTONS; inx++ ) {
		wButtonSetBusy( layer_btns[inx], layers[inx].visible != 0 );
		wControlSetBalloonText( (wControl_p)layer_btns[inx], (layers[inx].name[0] != '\0' ? layers[inx].name :_("Show/Hide Layer") ));
	}
}

/**
 * Initialize the layer lists.
 *
 * \param IN pointer to function that actually initialize tha data structures
 * \param IN current layer (0...NUM_LAYERS), (-1) for no change
 */

static void
InitializeLayers( void LayerInitFunc( void ), int newCurrLayer )
{
	/* reset the data structures to default valuses */
	LayerInitFunc();

	/* count the objects on each layer */
	LayerSetCounts();

	/* Switch the current layer when requested */
	if( newCurrLayer != -1 )
	{
		curLayer = newCurrLayer;
	}
}	

/**
 * Save the customized layer information to preferences.
 */
 
static void 
LayerPrefSave( void )
{
	int inx;
	int flags;
	char buffer[ 80 ];
	char layersSaved[ 3 * NUM_LAYERS ];			/* 0..99 plus separator */
	
	/* FIXME: values for layers that are configured to default now should be overwritten in the settings */	
	
	layersSaved[ 0 ] = '\0';
	
	for( inx = 0; inx < NUM_LAYERS; inx++ ) {
		/* if a name is set that is not the default value or a color different from the default has been set,
		    information about the layer needs to be saved */
		if( (layers[inx].name[0] && inx != 0 ) || 
			 layers[inx].frozen || (!layers[inx].onMap) || (!layers[inx].visible) || 
			 layers[inx].color != layerColorTab[inx%COUNT(layerColorTab)])
		{
				sprintf( buffer, LAYERPREF_NAME ".%0d", inx );
				wPrefSetString( LAYERPREF_SECTION, buffer, layers[inx].name );
				
				sprintf( buffer, LAYERPREF_COLOR ".%0d", inx );
				wPrefSetInteger( LAYERPREF_SECTION, buffer, wDrawGetRGB(layers[inx].color));
				
				flags = 0;
				if( layers[inx].frozen )
					flags |= LAYERPREF_FROZEN;
				if( layers[inx].onMap )
					flags |= LAYERPREF_ONMAP;
				if( layers[inx].visible )
					flags |= LAYERPREF_VISIBLE;

				sprintf( buffer, LAYERPREF_FLAGS ".%0d", inx );
				wPrefSetInteger( LAYERPREF_SECTION, buffer, flags ); 					
				
				/* extend the list of layers that are set up via the preferences */
				if( layersSaved[ 0 ] )
					strcat( layersSaved, "," );
					
				sprintf( layersSaved, "%s%d", layersSaved, inx );
		}
	}
	
	wPrefSetString( LAYERPREF_SECTION, "layers", layersSaved );
}


/**
 * Load the settings for all layers from the preferences. 
 */

static void
LayerPrefLoad( void )
{
	
	int inx;
	char layersSaved[ 3 * NUM_LAYERS ];
	char layerOption[ 20 ];
	const char *layerValue;
	const char *prefString;
	long rgb;
	int color;	
	long flags;

	/* reset layer preferences to system default */
	LayerSystemDefaults();
			
	prefString = wPrefGetString( LAYERPREF_SECTION, "layers" );
	if( prefString && prefString[ 0 ] ) {
		strncpy( layersSaved, prefString, sizeof( layersSaved ));
		prefString = strtok( layersSaved, "," );
		while( prefString ) {
			inx = atoi( prefString );
			sprintf( layerOption, LAYERPREF_NAME ".%d", inx );
			layerValue = wPrefGetString( LAYERPREF_SECTION, layerOption );
			if( layerValue )
				strcpy( layers[inx].name, layerValue );
			else 
				*(layers[inx].name) = '\0';
			
			/* get and set the color, using the system default color in case color is not available from prefs */
			sprintf( layerOption, LAYERPREF_COLOR ".%d", inx );
			wPrefGetInteger( LAYERPREF_SECTION, layerOption, &rgb, layerColorTab[inx%COUNT(layerColorTab)] ); 
			color = wDrawFindColor(rgb);
			SetLayerColor( inx, color );
			
			/* get and set the flags */
			sprintf( layerOption, LAYERPREF_FLAGS ".%d", inx );
			wPrefGetInteger( LAYERPREF_SECTION, layerOption, &flags, LAYERPREF_ONMAP | LAYERPREF_VISIBLE );

			layers[inx].frozen = ((flags & LAYERPREF_FROZEN) != 0 );
			layers[inx].onMap = ((flags & LAYERPREF_ONMAP) != 0 );
			layers[inx].visible = (( flags & LAYERPREF_VISIBLE ) != 0 );
						
			prefString = strtok( NULL, ",");
		}
	}
}

/**
 * Count the number of elements on a layer.
 * NOTE: This function has been implemented but not actually been tested. As it might prove useful in the 
 * future I left it in place. So you have been warned!
 * \param IN layer to count
 * \return number of elements
 */
/*
static int LayerCount( int layer ) 
{
	track_p trk;
	int inx;
	int count = 0;
	
	for( trk = NULL; TrackIterate(&trk); ) {
		inx = GetTrkLayer( trk );
		if( inx == layer )
			count++;
	}
	
	return count;
}			
*/

/**
 *	Count the number of objects on each layer and store result in layers data structure.
 */

EXPORT void LayerSetCounts( void )
{
	int inx;
	track_p trk;
	for ( inx=0; inx<NUM_LAYERS; inx++ )
		layers[inx].objCount = 0;
	for ( trk=NULL; TrackIterate(&trk); ) {
		inx = GetTrkLayer(trk);
		if ( inx >= 0 && inx < NUM_LAYERS )
			layers[inx].objCount++;
	}
}

/**
 * Reset layer options to their default values. The default values are loaded
 * from the preferences file.
 */

EXPORT void
DefaultLayerProperties(void)
{
	InitializeLayers( LayerPrefLoad, 0 );

	UpdateLayerDlg();
	if( layoutLayerChanged ) {
		MainProc( mainW, wResize_e, NULL );
		layoutLayerChanged = FALSE;
	}	
}

/**
 * Update all UI elements after selecting a layer.
 *
 */

static void LayerUpdate( void )
{
	BOOL_T redraw;
	ParamLoadData( &layerPG );
	if (layerCurrent < 0 || layerCurrent >= NUM_LAYERS)
		return;
	if (layerCurrent == curLayer && layerFrozen) {
		NoticeMessage( MSG_LAYER_FREEZE, _("Ok"), NULL );
		layerFrozen = FALSE;
		ParamLoadControl( &layerPG, I_FRZ );
	}
	if (layerCurrent == curLayer && !layerVisible) {
		NoticeMessage( MSG_LAYER_HIDE, _("Ok"), NULL );
		layerVisible = TRUE;
		ParamLoadControl( &layerPG, I_VIS );
	}
	
	if( strcmp( layers[(int)layerCurrent].name, layerName ) ||
		layerColor != layers[(int)layerCurrent].color || 
		layers[(int)layerCurrent].visible != (BOOL_T)layerVisible ||
		layers[(int)layerCurrent].frozen != (BOOL_T)layerFrozen ||
		layers[(int)layerCurrent].onMap != (BOOL_T)layerOnMap ) {
		
			changed = TRUE;
			SetWindowTitle();
	}

	if ( layerL ) {
		strncpy( layers[(int)layerCurrent].name, layerName, sizeof layers[(int)layerCurrent].name );
		sprintf( message, "%2d %c %s", (int)layerCurrent+1, layers[(int)layerCurrent].objCount>0?'+':'-', layers[(int)layerCurrent].name );
		wListSetValues( layerL, layerCurrent, message, NULL, NULL );
	}

	sprintf( message, "%2d : %s", (int)layerCurrent+1, layers[(int)layerCurrent].name );
	wListSetValues( setLayerL, layerCurrent, message, NULL, NULL );
	if (layerCurrent < NUM_BUTTONS) {
		if (strlen(layers[(int)layerCurrent].name)>0)
			wControlSetBalloonText( (wControl_p)layer_btns[(int)layerCurrent], layers[(int)layerCurrent].name );
		else
			wControlSetBalloonText( (wControl_p)layer_btns[(int)layerCurrent], _("Show/Hide Layer") );
	}
	redraw = ( layerColor != layers[(int)layerCurrent].color ||
			   (BOOL_T)layerVisible != layers[(int)layerCurrent].visible );
	if ( (!layerRedrawMap) && redraw)
		RedrawLayer( (LAYER_T)layerCurrent, FALSE );

	SetLayerColor( layerCurrent, layerColor );

	if (layerCurrent<NUM_BUTTONS && layers[(int)layerCurrent].visible!=(BOOL_T)layerVisible) {
		wButtonSetBusy( layer_btns[(int)layerCurrent], layerVisible );
	}
	layers[(int)layerCurrent].visible = (BOOL_T)layerVisible;
	layers[(int)layerCurrent].frozen = (BOOL_T)layerFrozen;
	layers[(int)layerCurrent].onMap = (BOOL_T)layerOnMap;
	if ( layerRedrawMap )
		DoRedraw();
	else if (redraw)
		RedrawLayer( (LAYER_T)layerCurrent, TRUE );
	layerRedrawMap = FALSE;
}


static void LayerSelect( 
		wIndex_t inx )
{
	LayerUpdate();
	if (inx < 0 || inx >= NUM_LAYERS)
		return;
	layerCurrent = (LAYER_T)inx;
	strcpy( layerName, layers[inx].name );
	layerVisible = layers[inx].visible;
	layerFrozen = layers[inx].frozen;
	layerOnMap = layers[inx].onMap;
	layerColor = layers[inx].color;
	sprintf( message, "%ld", layers[inx].objCount );

	ParamLoadMessage( &layerPG, I_COUNT, message );
	ParamLoadControls( &layerPG );
}

EXPORT void ResetLayers( void )
{
	int inx;
	for ( inx=0;inx<NUM_LAYERS; inx++ ) {
		strcpy( layers[inx].name, inx==0?_("Main"):"" );
		layers[inx].visible = TRUE;
		layers[inx].frozen = FALSE;
		layers[inx].onMap = TRUE;
		layers[inx].objCount = 0;
		SetLayerColor( inx, layerColorTab[inx%COUNT(layerColorTab)] );
		if ( inx<NUM_BUTTONS ) {
			wButtonSetLabel( layer_btns[inx], (char*)show_layer_bmps[inx] );
		}
	}
	wControlSetBalloonText( (wControl_p)layer_btns[0], _("Main") );
	for ( inx=1; inx<NUM_BUTTONS; inx++ ) {
		wControlSetBalloonText( (wControl_p)layer_btns[inx], _("Show/Hide Layer") );
	}
	curLayer = 0;
	layerVisible = TRUE;
	layerFrozen = FALSE;
	layerOnMap = TRUE;
	layerColor = layers[0].color;
	strcpy( layerName, layers[0].name );
 	LoadLayerLists();

	if (layerL) {
		ParamLoadControls( &layerPG );
		ParamLoadMessage( &layerPG, I_COUNT, "0" );
	}
}


EXPORT void SaveLayers( void )
{
	layers_save = malloc( NUM_LAYERS * sizeof( layer_t ));
	assert( layers_save != NULL );
	
	memcpy( layers_save, layers, NUM_LAYERS * sizeof layers[0] );
	ResetLayers();
}

EXPORT void RestoreLayers( void )
{
	int inx;
	char * label;
	wDrawColor color;

	assert( layers_save != NULL );
	memcpy( layers, layers_save, NUM_LAYERS * sizeof layers[0] );
	free( layers_save );
	
	for ( inx=0; inx<NUM_BUTTONS; inx++ ) {
		color = layers[inx].color;
		layers[inx].color = -1;
		SetLayerColor( inx, color );
		if ( layers[inx].name[0] == '\0' ) {
			if ( inx == 0 ) {
				label = _("Main");
			} else {
				label = _("Show/Hide Layer");
			}
		} else {
			label = layers[inx].name;
		}
		wControlSetBalloonText( (wControl_p)layer_btns[inx], label );
	}
	if (layerL) {
		ParamLoadControls( &layerPG );
		ParamLoadMessage( &layerPG, I_COUNT, "0" );
	}
	LoadLayerLists();
}

/**
 * This function is called when the Done button on the layer dialog is pressed. It hides the layer dialog and
 * updates the layer information.
 *
 * \param IN ignored
 *
 */
 
static void LayerOk( void * junk )
{
	LayerSelect( layerCurrent ); 

	if (newLayerCount != layerCount) {
		layoutLayerChanged = TRUE;
		if ( newLayerCount > NUM_BUTTONS )
			newLayerCount = NUM_BUTTONS;
		layerCount = newLayerCount;
	}
	if (layoutLayerChanged)
		MainProc( mainW, wResize_e, NULL );
	wHide( layerW );
}


static void LayerDlgUpdate(
		paramGroup_p pg,
		int inx,
		void * valueP )
{
	switch (inx) {
	case I_LIST:
		LayerSelect( (wIndex_t)*(long*)valueP );
		break;
	case I_NAME:
		LayerUpdate();
		break;
	case I_MAP:
		layerRedrawMap = TRUE;
		break;
	}
}


static void DoLayer( void * junk )
{
	if (layerW == NULL)
		layerW = ParamCreateDialog( &layerPG, MakeWindowTitle(_("Layers")), _("Done"), LayerOk, NULL, TRUE, NULL, 0, LayerDlgUpdate );

	/* set the globals to the values for the current layer */
	UpdateLayerDlg();
	
	layerRedrawMap = FALSE;
	wShow( layerW );

	layoutLayerChanged = FALSE;
}


EXPORT BOOL_T ReadLayers( char * line )
{
	char * name;
	int inx, visible, frozen, color, onMap;
	unsigned long rgb;

	/* older files didn't support layers */

	if (paramVersion < 7)
		return TRUE;

	/* set the current layer */

	if ( strncmp( line, "CURRENT", 7 ) == 0 ) {
		curLayer = atoi( line+7 );
		if ( curLayer < 0 )
			curLayer = 0;

		if (layerL)
			wListSetIndex( layerL, curLayer );
		if (setLayerL)
			wListSetIndex( setLayerL, curLayer );
			
		return TRUE;
	}

	/* get the properties for a layer from the file and update the layer accordingly */

	if (!GetArgs( line, "ddddu0000q", &inx, &visible, &frozen, &onMap, &rgb, &name ))
		return FALSE;
	if (paramVersion < 9) {
		if ( rgb >= 0 && (int)rgb < sizeof oldColorMap/sizeof oldColorMap[0] )
			rgb = wRGB( oldColorMap[(int)rgb][0], oldColorMap[(int)rgb][1], oldColorMap[(int)rgb][2] );
		else
			rgb = 0;
	}
	if (inx < 0 || inx >= NUM_LAYERS)
		return FALSE;
	color = wDrawFindColor(rgb);
	SetLayerColor( inx, color );
	strncpy( layers[inx].name, name, sizeof layers[inx].name );
	layers[inx].visible = visible;
	layers[inx].frozen = frozen;
	layers[inx].onMap = onMap;
	layers[inx].color = color;
	if (inx<NUM_BUTTONS) {
		if (strlen(name) > 0) {
			wControlSetBalloonText( (wControl_p)layer_btns[(int)inx], layers[inx].name );
		}
		wButtonSetBusy( layer_btns[(int)inx], visible );
	}
	return TRUE;
}


EXPORT BOOL_T WriteLayers( FILE * f )
{
	int inx;
	BOOL_T rc = TRUE;
	for (inx=0; inx<NUM_LAYERS; inx++) 
		if ((!layers[inx].visible) || layers[inx].frozen || (!layers[inx].onMap) ||
			layers[inx].color!=layerColorTab[inx%(COUNT(layerColorTab))] ||
			layers[inx].name[0] )
			rc &= fprintf( f, "LAYERS %d %d %d %d %ld %d %d %d %d \"%s\"\n", inx, layers[inx].visible, layers[inx].frozen, layers[inx].onMap, wDrawGetRGB(layers[inx].color), 0, 0, 0, 0, PutTitle(layers[inx].name) )>0;
	rc &= fprintf( f, "LAYERS CURRENT %d\n", curLayer )>0;
	return TRUE;
}


EXPORT void InitLayers( void )
{
	int i;

	wPrefGetInteger( PREFSECT, "layer-button-count", &layerCount, layerCount );
	for ( i = 0; i<COUNT(layerRawColorTab); i++ )
		layerColorTab[i] = wDrawFindColor( layerRawColorTab[i] );

	/* create the bitmaps for the layer buttons */
	/* all bitmaps have to have the same dimensions */
	for ( i = 0; i<NUM_BUTTONS; i++ ) {
		show_layer_bmps[i] = wIconCreateBitMap( l1_width, l1_height, show_layer_bits[i], layerColorTab[i%(COUNT(layerColorTab))] );
		layers[i].color = layerColorTab[i%(COUNT(layerColorTab))];
	}
	
	/* layer list for toolbar */
	setLayerL = wDropListCreate( mainW, 0, 0, "cmdLayerSet", NULL, 0, 10, 200, NULL, SetCurrLayer, NULL );
	wControlSetBalloonText( (wControl_p)setLayerL, GetBalloonHelpStr("cmdLayerSet") );
	AddToolbarControl( (wControl_p)setLayerL, IC_MODETRAIN_TOO );

	for ( i = 0; i<NUM_LAYERS; i++ ) {
		if (i<NUM_BUTTONS) {
			/* create the layer button */
		   sprintf( message, "cmdLayerShow%d", i );
		   layer_btns[i] = wButtonCreate( mainW, 0, 0, message,
				(char*)(show_layer_bmps[i]),
				BO_ICON, 0, (wButtonCallBack_p)FlipLayer, (void*)(intptr_t)i );
			
			/* add the help text */
			wControlSetBalloonText( (wControl_p)layer_btns[i], _("Show/Hide Layer") );
			
			/* put on toolbar */
			AddToolbarControl( (wControl_p)layer_btns[i], IC_MODETRAIN_TOO );
			
			/* set state of button */
			wButtonSetBusy( layer_btns[i], 1 );
		}
		sprintf( message, "%2d : %s", i+1, (i==0?_("Main"):"") );
		wListAddValue( setLayerL, message, NULL, (void*)(intptr_t)i );
	}
	AddPlaybackProc( "SETCURRLAYER", PlaybackCurrLayer, NULL );
	AddPlaybackProc( "LAYERS", (playbackProc_p)ReadLayers, NULL );
}


EXPORT addButtonCallBack_t InitLayersDialog( void ) {
	ParamRegister( &layerPG );
	return &DoLayer;
}