OOJSGlobal.m

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/*
 
OOJSGlobal.m
 
 
Oolite
Copyright (C) 2004-2013 Giles C Williams and contributors
 
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., 51 Franklin Street, Fifth Floor, Boston,
MA 02110-1301, USA.
 
*/
 
#import "OOJSGlobal.h"
#import "OOJavaScriptEngine.h"
 
#import "OOJSPlayer.h"
#import "PlayerEntityScriptMethods.h"
#import "OOStringExpander.h"
#import "OOConstToString.h"
#import "OOConstToJSString.h"
#import "OOCollectionExtractors.h"
#import "OOTexture.h"
#import "GuiDisplayGen.h"
#import "MyOpenGLView.h"
#import "ResourceManager.h"
#import "OOSystemDescriptionManager.h"
#import "NSFileManagerOOExtensions.h"
#import "OOJSGuiScreenKeyDefinition.h"
 
#if OOJSENGINE_MONITOR_SUPPORT
 
@interface OOJavaScriptEngine (OOMonitorSupportInternal)
 
- (void)sendMonitorLogMessage:(NSString *)message
             withMessageClass:(NSString *)messageClass
                    inContext:(JSContext *)context;
 
@end
 
#endif
 
 
static NSString * const kOOLogDebugMessage = @"script.debug.message";
 
 
static JSBool GlobalGetProperty(JSContext *context, JSObject *this, jsid propID, jsval *value);
#ifndef NDEBUG
static JSBool GlobalSetProperty(JSContext *context, JSObject *this, jsid propID, JSBool strict, jsval *value);
#endif
 
static JSBool GlobalLog(JSContext *context, uintN argc, jsval *vp);
static JSBool GlobalExpandDescription(JSContext *context, uintN argc, jsval *vp);
static JSBool GlobalKeyBindingDescription(JSContext *context, uintN argc, jsval *vp); 
static JSBool GlobalExpandMissionText(JSContext *context, uintN argc, jsval *vp);
static JSBool GlobalDisplayNameForCommodity(JSContext *context, uintN argc, jsval *vp);
static JSBool GlobalRandomName(JSContext *context, uintN argc, jsval *vp);
static JSBool GlobalRandomInhabitantsDescription(JSContext *context, uintN argc, jsval *vp);
static JSBool GlobalSetScreenBackground(JSContext *context, uintN argc, jsval *vp);
static JSBool GlobalSetScreenOverlay(JSContext *context, uintN argc, jsval *vp);
static JSBool GlobalGetScreenBackgroundForKey(JSContext *context, uintN argc, jsval *vp);
static JSBool GlobalSetScreenBackgroundForKey(JSContext *context, uintN argc, jsval *vp);
static JSBool GlobalAutoAIForRole(JSContext *context, uintN argc, jsval *vp);
static JSBool GlobalPauseGame(JSContext *context, uintN argc, jsval *vp);
static JSBool GlobalGetGuiColorSettingForKey(JSContext *context, uintN argc, jsval *vp);
static JSBool GlobalSetGuiColorSettingForKey(JSContext *context, uintN argc, jsval *vp);
static JSBool GlobalSetExtraGuiScreenKeys(JSContext *context, uintN argc, jsval *vp);
static JSBool GlobalClearExtraGuiScreenKeys(JSContext *context, uintN argc, jsval *vp);
 
#ifndef NDEBUG
static JSBool GlobalTakeSnapShot(JSContext *context, uintN argc, jsval *vp);
#endif
 
 
static JSClass sGlobalClass =
{
    "Global",
    JSCLASS_GLOBAL_FLAGS,
    
    JS_PropertyStub,
    JS_PropertyStub,
    GlobalGetProperty,
#ifndef NDEBUG
    GlobalSetProperty,
#else
    // No writeable properties in non-debug builds
    JS_StrictPropertyStub,
#endif
    JS_EnumerateStub,
    JS_ResolveStub,
    JS_ConvertStub,
    JS_FinalizeStub
};
 
 
enum
{
    // Property IDs
    kGlobal_galaxyNumber,       // galaxy number, integer, read-only
    kGlobal_global,               // global.global.global.global, integer, read-only
    kGlobal_guiScreen,         // current GUI screen, string, read-only
#ifndef NDEBUG
    kGlobal_timeAccelerationFactor    // time acceleration, float, read/write
#endif
};
 
 
static JSPropertySpec sGlobalProperties[] =
{
    // JS name                  ID                          flags
    { "galaxyNumber",           kGlobal_galaxyNumber,       OOJS_PROP_READONLY_CB },
    { "guiScreen",              kGlobal_guiScreen,         OOJS_PROP_READONLY_CB },
#ifndef NDEBUG
    { "timeAccelerationFactor", kGlobal_timeAccelerationFactor,   OOJS_PROP_READWRITE_CB },
#endif
    { 0 }
};
 
 
static JSFunctionSpec sGlobalMethods[] =
{
    // JS name                          Function                                min args
    { "log",                            GlobalLog,                         1 },
    { "autoAIForRole",                  GlobalAutoAIForRole,             1 },
    { "expandDescription",              GlobalExpandDescription,         1 },
    { "expandMissionText",              GlobalExpandMissionText,         1 },
    { "displayNameForCommodity",        GlobalDisplayNameForCommodity,     1 },
    { "randomName",                     GlobalRandomName,                   0 },
    { "randomInhabitantsDescription",   GlobalRandomInhabitantsDescription,   1 },
    { "setScreenBackground",            GlobalSetScreenBackground,         1 },
    { "getScreenBackgroundForKey",      GlobalGetScreenBackgroundForKey,    1 },
    { "setScreenBackgroundForKey",      GlobalSetScreenBackgroundForKey,    2 },
    { "setScreenOverlay",               GlobalSetScreenOverlay,               1 },
    { "getGuiColorSettingForKey",       GlobalGetGuiColorSettingForKey,     1 },
    { "setGuiColorSettingForKey",       GlobalSetGuiColorSettingForKey,     2 },
    { "keyBindingDescription",          GlobalKeyBindingDescription,     1 },
    { "setExtraGuiScreenKeys",          GlobalSetExtraGuiScreenKeys,     2 },
    { "clearExtraGuiScreenKeys",        GlobalClearExtraGuiScreenKeys,     2 },
 
#ifndef NDEBUG
    { "takeSnapShot",                   GlobalTakeSnapShot,                   1 },
#endif
    { "pauseGame",                      GlobalPauseGame,                 0 },
    { 0 }
};
 
 
void CreateOOJSGlobal(JSContext *context, JSObject **outGlobal)
{
    assert(outGlobal != NULL);
    
    *outGlobal = JS_NewCompartmentAndGlobalObject(context, &sGlobalClass, NULL);
    
    JS_SetGlobalObject(context, *outGlobal);
    JS_DefineProperty(context, *outGlobal, "global", OBJECT_TO_JSVAL(*outGlobal), NULL, NULL, OOJS_PROP_READONLY);
}
 
 
void SetUpOOJSGlobal(JSContext *context, JSObject *global)
{
    JS_DefineProperties(context, global, sGlobalProperties);
    JS_DefineFunctions(context, global, sGlobalMethods);
}
 
 
static JSBool GlobalGetProperty(JSContext *context, JSObject *this, jsid propID, jsval *value)
{
    if (!JSID_IS_INT(propID))  return YES;
    
    OOJS_NATIVE_ENTER(context)
    
    PlayerEntity                *player = OOPlayerForScripting();
    
    switch (JSID_TO_INT(propID))
    {
        case kGlobal_galaxyNumber:
            *value = INT_TO_JSVAL([player currentGalaxyID]);
            return YES;
            
        case kGlobal_guiScreen:
            *value = OOJSValueFromGUIScreenID(context, [player guiScreen]);
            return YES;
            
#ifndef NDEBUG
        case kGlobal_timeAccelerationFactor:
            return JS_NewNumberValue(context, [UNIVERSE timeAccelerationFactor], value);
#endif
            
        default:
            OOJSReportBadPropertySelector(context, this, propID, sGlobalProperties);
            return NO;
    }
    
    OOJS_NATIVE_EXIT
}
 
 
#ifndef NDEBUG
static JSBool GlobalSetProperty(JSContext *context, JSObject *this, jsid propID, JSBool strict, jsval *value)
{
    if (!JSID_IS_INT(propID))  return YES;
    
    OOJS_NATIVE_ENTER(context)
    
    jsdouble                    fValue;
    
    switch (JSID_TO_INT(propID))
    {
        case kGlobal_timeAccelerationFactor:
            if (JS_ValueToNumber(context, *value, &fValue))
            {
                [UNIVERSE setTimeAccelerationFactor:fValue];
                return YES;
            }
            break;
    
        default:
            OOJSReportBadPropertySelector(context, this, propID, sGlobalProperties);
    }
    
    OOJSReportBadPropertyValue(context, this, propID, sGlobalProperties, *value);
    return NO;
    
    OOJS_NATIVE_EXIT
}
#endif
 
 
// *** Methods ***
 
// log([messageClass : String,] message : string, ...)
static JSBool GlobalLog(JSContext *context, uintN argc, jsval *vp)
{
    OOJS_NATIVE_ENTER(context)
    
    NSString            *message = nil;
    NSString            *messageClass = nil;
    
    if (EXPECT_NOT(argc < 1))
    {
        OOJS_RETURN_VOID;
    }
    if (argc < 2)
    {
        messageClass = kOOLogDebugMessage;
        message = OOStringFromJSValue(context, OOJS_ARGV[0]);
    }
    else
    {
        messageClass = OOStringFromJSValueEvenIfNull(context, OOJS_ARGV[0]);
        if (!OOLogWillDisplayMessagesInClass(messageClass))
        {
            // Do nothing (and short-circuit) if message class is filtered out.
            OOJS_RETURN_VOID;
        }
        
        message = [NSString concatenationOfStringsFromJavaScriptValues:OOJS_ARGV + 1 count:argc - 1 separator:@", " inContext:context];
    }
    
    OOJS_BEGIN_FULL_NATIVE(context)
    OOLog(messageClass, @"%@", message);
    
#if OOJSENGINE_MONITOR_SUPPORT
    [[OOJavaScriptEngine sharedEngine] sendMonitorLogMessage:message
                                            withMessageClass:nil
                                                   inContext:context];
#endif
    OOJS_END_FULL_NATIVE
    
    OOJS_RETURN_VOID;
    
    OOJS_NATIVE_EXIT
}
 
 
// expandDescription(description : String [, overrides : object (dictionary)]) : String
static JSBool GlobalExpandDescription(JSContext *context, uintN argc, jsval *vp)
{
    OOJS_NATIVE_ENTER(context)
    
    NSString            *string = nil;
    NSDictionary        *overrides = nil;
    
    if (argc > 0)  string = OOStringFromJSValue(context, OOJS_ARGV[0]);
    if (string == nil)
    {
        OOJSReportBadArguments(context, nil, @"expandDescription", MIN(argc, 1U), OOJS_ARGV, nil, @"string");
        return NO;
    }
    if (argc > 1)
    {
        overrides = OOJSDictionaryFromStringTable(context, OOJS_ARGV[1]);
    }
    
    OOJS_BEGIN_FULL_NATIVE(context)
    string = OOExpandDescriptionString(kNilRandomSeed, string, overrides, nil, nil, kOOExpandForJavaScript | kOOExpandGoodRNG);
    OOJS_END_FULL_NATIVE
    
    OOJS_RETURN_OBJECT(string);
    
    OOJS_NATIVE_EXIT
}
 
static JSBool GlobalKeyBindingDescription(JSContext *context, uintN argc, jsval *vp)
{
    OOJS_NATIVE_ENTER(context)
    
    NSString            *string = nil;
    PlayerEntity                *player = OOPlayerForScripting();
    
    if (argc > 0)  string = OOStringFromJSValue(context, OOJS_ARGV[0]);
    if (string == nil)
    {
        OOJSReportBadArguments(context, nil, @"keyBindingDescription", MIN(argc, 1U), OOJS_ARGV, nil, @"string");
        return NO;
    }
    
    OOJS_BEGIN_FULL_NATIVE(context)
    string = [player keyBindingDescription2:string];
    OOJS_END_FULL_NATIVE
    
    OOJS_RETURN_OBJECT(string);
    
    OOJS_NATIVE_EXIT
}
 
 
// expandMissionText(textKey : String [, overrides : object (dictionary)]) : String
static JSBool GlobalExpandMissionText(JSContext *context, uintN argc, jsval *vp)
{
    OOJS_NATIVE_ENTER(context)
    
    NSString            *string = nil;
    NSDictionary        *overrides = nil;
    
    if (argc > 0)  string = OOStringFromJSValue(context, OOJS_ARGV[0]);
    if (string == nil)
    {
        OOJSReportBadArguments(context, nil, @"expandMissionText", MIN(argc, 1U), OOJS_ARGV, nil, @"string");
        return NO;
    }
    if (argc > 1)
    {
        overrides = OOJSDictionaryFromStringTable(context, OOJS_ARGV[1]);
    }
    
    string = [[UNIVERSE missiontext] oo_stringForKey:string];
    string = OOExpandDescriptionString(kNilRandomSeed, string, overrides, nil, nil, kOOExpandForJavaScript | kOOExpandBackslashN | kOOExpandGoodRNG);
    
    OOJS_RETURN_OBJECT(string);
    
    OOJS_NATIVE_EXIT
}
 
 
// displayNameForCommodity(commodityName : String) : String
static JSBool GlobalDisplayNameForCommodity(JSContext *context, uintN argc, jsval *vp)
{
    OOJS_NATIVE_ENTER(context)
    
    NSString            *string = nil;
    
    if (argc > 0)  string = OOStringFromJSValue(context,OOJS_ARGV[0]);
    if (string == nil)
    {
        OOJSReportBadArguments(context, nil, @"displayNameForCommodity", MIN(argc, 1U), OOJS_ARGV, nil, @"string");
        return NO;
    }
    OOJS_RETURN_OBJECT(CommodityDisplayNameForSymbolicName(string));
    
    OOJS_NATIVE_EXIT
}
 
 
// randomName() : String
static JSBool GlobalRandomName(JSContext *context, uintN argc, jsval *vp)
{
    OOJS_NATIVE_ENTER(context)
    
    /*  Temporarily set the system generation seed to a "really random" seed,
        so randomName() isn't repeatable.
    */
    RNG_Seed savedSeed = currentRandomSeed();
    setRandomSeed((RNG_Seed){ Ranrot(), Ranrot(), Ranrot(), Ranrot() });
    
    NSString *result = OOExpand(@"%N");
    
    // Restore seed.
    setRandomSeed(savedSeed);
    
    OOJS_RETURN_OBJECT(result);
    
    OOJS_NATIVE_EXIT
}
 
 
// randomInhabitantsDescription() : String
static JSBool GlobalRandomInhabitantsDescription(JSContext *context, uintN argc, jsval *vp)
{
    OOJS_NATIVE_ENTER(context)
    
    NSString            *string = nil;
    Random_Seed          aSeed;
    JSBool              isPlural = YES;
    
    if (argc > 0 && !JS_ValueToBoolean(context, OOJS_ARGV[0], &isPlural))
    {
        OOJSReportBadArguments(context, nil, @"randomInhabitantsDescription", 1, OOJS_ARGV, nil, @"boolean");
        return NO;
    }
    
    make_pseudo_random_seed(&aSeed);
    string = [UNIVERSE getSystemInhabitants:Ranrot()%OO_SYSTEMS_PER_GALAXY plural:isPlural];
    OOJS_RETURN_OBJECT(string);
    
    OOJS_NATIVE_EXIT
}
 
 
static JSBool GlobalClearExtraGuiScreenKeys(JSContext *context, uintN argc, jsval *vp)
{
    OOJS_NATIVE_ENTER(context)
 
    BOOL                result = NO;
    PlayerEntity        *player = OOPlayerForScripting();
 
    if (EXPECT_NOT(argc < 2))
    {
        OOJSReportBadArguments(context, nil, @"setExtraGuiScreenKeys", 0, OOJS_ARGV, nil, @"missing arguments");
        return NO;
    }
 
    NSString *key = OOStringFromJSValue(context, OOJS_ARGV[0]);
    if (EXPECT_NOT(key == nil || [key isEqualToString:@""]))
    {
        OOJSReportBadArguments(context, nil, @"clearExtraGuiScreenKeys", 1, OOJS_ARGV, nil, @"key");
        return NO;
    }
 
    OOGUIScreenID gui = OOGUIScreenIDFromJSValue(context, OOJS_ARGV[1]);
    if (!gui)
    {
        OOJSReportBadArguments(context, nil, @"clearExtraGuiScreenKeys", 0, OOJS_ARGV, nil, @"guiScreen invalid entry");
        return NO;
    }
 
    [player clearExtraGuiScreenKeys:gui key:key];
 
    result = YES;
    OOJS_RETURN_BOOL(result);
    
    OOJS_NATIVE_EXIT
}
 
static JSBool GlobalSetExtraGuiScreenKeys(JSContext *context, uintN argc, jsval *vp)
{
    OOJS_NATIVE_ENTER(context)
 
    BOOL                result = NO;
    jsval               callback = JSVAL_NULL;
    JSObject            *callbackThis = NULL;
    jsval               value = JSVAL_NULL;
    NSString            *key = nil;
    OOGUIScreenID      gui;
    NSDictionary        *keydefs = NULL;
    JSObject            *params = NULL;
    PlayerEntity        *player = OOPlayerForScripting();
 
    if (EXPECT_NOT(argc < 1))
    {
        OOJSReportBadArguments(context, nil, @"setExtraGuiScreenKeys", 0, OOJS_ARGV, nil, @"key, definition");
        return NO;
    }
    key = OOStringFromJSValue(context, OOJS_ARGV[0]);
 
    // Validate arguments.
    if (argc < 2 || !JS_ValueToObject(context, OOJS_ARGV[1], &params))
    {
        OOJSReportBadArguments(context, @"global", @"setExtraGuiScreenKeys", 2, &OOJS_ARGV[1], nil, @"key, definition: definition is not a valid dictionary.");
        return NO;
    }
 
    if (JS_GetProperty(context, params, "guiScreen", &value) == JS_FALSE || JSVAL_IS_VOID(value))
    {
        OOJSReportBadArguments(context, @"global", @"setExtraGuiScreenKeys", 2, &OOJS_ARGV[1], nil, @"key, definition: must have a 'guiScreen' property.");
        return NO;
    }
 
    gui = OOGUIScreenIDFromJSValue(context, value);
    // gui will be 0 for invalid screen id's as well as GUI_SCREEN_MAIN
    if (gui == 0 || gui == GUI_SCREEN_LOAD || gui == GUI_SCREEN_SAVE || gui == GUI_SCREEN_STICKMAPPER || gui == GUI_SCREEN_OXZMANAGER || 
        gui == GUI_SCREEN_NEWGAME || gui == GUI_SCREEN_SAVE_OVERWRITE || gui == GUI_SCREEN_KEYBOARD || gui == GUI_SCREEN_STICKPROFILE || gui == GUI_SCREEN_KEYBOARD_CONFIRMCLEAR ||
        gui == GUI_SCREEN_KEYBOARD_CONFIG || gui == GUI_SCREEN_KEYBOARD_ENTRY || gui == GUI_SCREEN_KEYBOARD_LAYOUT)
    {
        OOJSReportBadArguments(context, @"global", @"setExtraGuiScreenKeys", 2, &OOJS_ARGV[1], nil, @"key, definition: 'guiScreen' property must be a permitted and valid GUI_SCREEN idenfifier.");
        return NO;
    }
 
    if (JS_GetProperty(context, params, "registerKeys", &value) == JS_FALSE || JSVAL_IS_VOID(value))
    {
        OOJSReportBadArguments(context, @"global", @"setExtraGuiScreenKeys", 2, &OOJS_ARGV[1], nil, @"key, definition: must have a 'registerKeys' property.");
        return NO;
    }
    if (!JSVAL_IS_NULL(value))
    {
        if (JSVAL_IS_OBJECT(value))
        {
            keydefs = OOJSNativeObjectFromJSObject(context, JSVAL_TO_OBJECT(value));
        }
        else 
        {
            OOJSReportBadArguments(context, @"global", @"setExtraGuiScreenKeys", 2, &OOJS_ARGV[1], nil, @"key, definition: registerKeys is not a valid dictionary.");
            return NO;
        }
    }
 
    if (JS_GetProperty(context, params, "callback", &callback) == JS_FALSE || JSVAL_IS_VOID(callback))
    {
        OOJSReportBadArguments(context, @"global", @"setExtraGuiScreenKeys", 2, &OOJS_ARGV[1], NULL, @"key, definition; must have a 'callback' property.");
        return NO;
    }
    if (!OOJSValueIsFunction(context,callback))
    {
        OOJSReportBadArguments(context, @"global", @"setExtraGuiScreenKeys", 2, &OOJS_ARGV[1], NULL, @"key, definition; 'callback' property must be a function.");
        return NO;
    }
 
    OOJSGuiScreenKeyDefinition* definition = [[OOJSGuiScreenKeyDefinition alloc] init];
    [definition setName:key];
    [definition setRegisterKeys:keydefs];
    [definition setCallback:callback];
 
    // get callback 'this'
    if (JS_GetProperty(context, params, "cbThis", &value) == JS_TRUE && !JSVAL_IS_VOID(value))
    {
        JS_ValueToObject(context, value, &callbackThis);
        [definition setCallbackThis:callbackThis];
        // can do .bind(this) for callback instead
    }
 
    result = [player setExtraGuiScreenKeys:gui definition:definition];
    [definition release];
 
    OOJS_RETURN_BOOL(result);
    
    OOJS_NATIVE_EXIT
}
 
 
// setScreenBackground(descriptor : guiTextureDescriptor) : Boolean
static JSBool GlobalSetScreenBackground(JSContext *context, uintN argc, jsval *vp)
{
    OOJS_NATIVE_ENTER(context)
    
    BOOL            result = NO;
    jsval           value = (argc > 0) ? OOJS_ARGV[0] : JSVAL_NULL;
    
    if (EXPECT_NOT(argc == 0))
    {
        OOJSReportWarning(context, @"Usage error: %@() called with no arguments. Treating as %@(null). This call may fail in a future version of Oolite.", @"setScreenBackground", @"setScreenBackground");
    }
    else if (EXPECT_NOT(JSVAL_IS_VOID(value)))
    {
        OOJSReportBadArguments(context, nil, @"setScreenBackground", 1, &value, nil, @"GUI texture descriptor");
        return NO;
    }
    
    if ([UNIVERSE viewDirection] == VIEW_GUI_DISPLAY)
    {
        GuiDisplayGen  *gui = [UNIVERSE gui];
        NSDictionary    *descriptor = [gui textureDescriptorFromJSValue:value inContext:context callerDescription:@"setScreenBackground()"];
        
        result = [gui setBackgroundTextureDescriptor:descriptor];
        
        // add some permanence to the override if we're in the equip ship screen
        if (result && [PLAYER guiScreen] == GUI_SCREEN_EQUIP_SHIP)  [PLAYER setEquipScreenBackgroundDescriptor:descriptor];
    }
    
    OOJS_RETURN_BOOL(result);
    
    OOJS_NATIVE_EXIT
}
 
 
static JSBool GlobalGetScreenBackgroundForKey(JSContext *context, uintN argc, jsval *vp) 
{
    OOJS_NATIVE_ENTER(context)
    
    if (EXPECT_NOT(argc == 0))
    {
        OOJSReportBadArguments(context, nil, @"getScreenBackgroundDefault", 0, OOJS_ARGV, nil, @"missing arguments");
        return NO;
    }
    NSString        *key = OOStringFromJSValue(context, OOJS_ARGV[0]);
    if (EXPECT_NOT(key == nil || [key isEqualToString:@""]))
    {
        OOJSReportBadArguments(context, nil, @"getScreenBackgroundDefault", 0, OOJS_ARGV, nil, @"key");
        return NO;
    }
    NSDictionary *descriptor = [UNIVERSE screenTextureDescriptorForKey:key];
 
    OOJS_RETURN_OBJECT(descriptor);
    
    OOJS_NATIVE_EXIT
} 
 
// setScreenBackgroundDefault (key : NSString, descriptor : guiTextureDescriptor) : boolean
static JSBool GlobalSetScreenBackgroundForKey(JSContext *context, uintN argc, jsval *vp) 
{
    OOJS_NATIVE_ENTER(context)
    
    BOOL            result = NO;
    
    if (EXPECT_NOT(argc < 2))
    {
        OOJSReportBadArguments(context, nil, @"setScreenBackgroundDefault", 0, OOJS_ARGV, nil, @"missing arguments");
        return NO;
    }
 
    NSString        *key = OOStringFromJSValue(context, OOJS_ARGV[0]);
    jsval           value = OOJS_ARGV[1];
    if (EXPECT_NOT(key == nil || [key isEqualToString:@""]))
    {
        OOJSReportBadArguments(context, nil, @"setScreenBackgroundDefault", 0, OOJS_ARGV, nil, @"key");
        return NO;
    }
 
    GuiDisplayGen  *gui = [UNIVERSE gui];
    NSDictionary    *descriptor = [gui textureDescriptorFromJSValue:value inContext:context callerDescription:@"setScreenBackgroundDefault()"];
    
    [UNIVERSE setScreenTextureDescriptorForKey:key descriptor:descriptor];
    result = YES;
    
    OOJS_RETURN_BOOL(result);
    
    OOJS_NATIVE_EXIT
}
 
 
// setScreenOverlay(descriptor : guiTextureDescriptor) : Boolean
static JSBool GlobalSetScreenOverlay(JSContext *context, uintN argc, jsval *vp)
{
    OOJS_NATIVE_ENTER(context)
    
    BOOL            result = NO;
    jsval           value = (argc > 0) ? OOJS_ARGV[0] : JSVAL_NULL;
    
    if (EXPECT_NOT(argc == 0))
    {
        OOJSReportWarning(context, @"Usage error: %@() called with no arguments. Treating as %@(null). This call may fail in a future version of Oolite.", @"setScreenOverlay", @"setScreenOverlay");
    }
    else if (EXPECT_NOT(JSVAL_IS_VOID(value)))
    {
        OOJSReportBadArguments(context, nil, @"setScreenOverlay", 1, &value, nil, @"GUI texture descriptor");
        return NO;
    }
    
    if ([UNIVERSE viewDirection] == VIEW_GUI_DISPLAY)
    {
        GuiDisplayGen  *gui = [UNIVERSE gui];
        NSDictionary    *descriptor = [gui textureDescriptorFromJSValue:value inContext:context callerDescription:@"setScreenOverlay()"];
        
        result = [gui setForegroundTextureDescriptor:descriptor];
    }
    
    OOJS_RETURN_BOOL(result);
    
    OOJS_NATIVE_EXIT
}
 
 
static JSBool GlobalGetGuiColorSettingForKey(JSContext *context, uintN argc, jsval *vp)
{
    OOJS_NATIVE_ENTER(context)
    
    if (EXPECT_NOT(argc == 0))
    {
        OOJSReportBadArguments(context, nil, @"getGuiColorForKey", 0, OOJS_ARGV, nil, @"missing arguments");
        return NO;
    }
    NSString        *key = OOStringFromJSValue(context, OOJS_ARGV[0]);
    if (EXPECT_NOT(key == nil || [key isEqualToString:@""]))
    {
        OOJSReportBadArguments(context, nil, @"getGuiColorForKey", 0, OOJS_ARGV, nil, @"key");
        return NO;
    }
    if ([key rangeOfString:@"color"].location == NSNotFound)
    {
        OOJSReportBadArguments(context, nil, @"getGuiColorForKey", 0, OOJS_ARGV, nil, @"valid color key setting");
        return NO;
    }
 
    GuiDisplayGen  *gui = [UNIVERSE gui];
    OOColor *col = [gui colorFromSetting:key defaultValue:nil];
 
    OOJS_RETURN_OBJECT([col normalizedArray]);
    
    OOJS_NATIVE_EXIT
}
 
 
// setGuiColorForKey(descriptor : OOColor) : boolean
static JSBool GlobalSetGuiColorSettingForKey(JSContext *context, uintN argc, jsval *vp)
{
    OOJS_NATIVE_ENTER(context)
    
    BOOL            result = NO;
    OOColor          *col = nil;
    
    if (EXPECT_NOT(argc != 2))
    {
        OOJSReportBadArguments(context, nil, @"setGuiColorForKey", 0, OOJS_ARGV, nil, @"missing arguments");
        return NO;
    }
 
    NSString        *key = OOStringFromJSValue(context, OOJS_ARGV[0]);
    jsval           value = OOJS_ARGV[1];
    if (EXPECT_NOT(key == nil || [key isEqualToString:@""]))
    {
        OOJSReportBadArguments(context, nil, @"setGuiColorForKey", 0, OOJS_ARGV, nil, @"key");
        return NO;
    }
    if ([key rangeOfString:@"color"].location == NSNotFound)
    {
        OOJSReportBadArguments(context, nil, @"setGuiColorForKey", 0, OOJS_ARGV, nil, @"valid color key setting");
        return NO;
    }
 
    if (!JSVAL_IS_NULL(value))
    {
        col = [OOColor colorWithDescription:OOJSNativeObjectFromJSValue(context, value)];
        if (col == nil)
        {
            OOJSReportBadArguments(context, nil, @"setGuiColorForKey", 1, OOJS_ARGV, nil, @"color descriptor");
            return NO;
        }
    }
 
    GuiDisplayGen  *gui = [UNIVERSE gui];
    [gui setGuiColorSettingFromKey:key color:col];
    result = YES;
    
    OOJS_RETURN_BOOL(result);
    
    OOJS_NATIVE_EXIT
}
 
 
#ifndef NDEBUG
// takeSnapShot([name : alphanumeric String]) : Boolean
static JSBool GlobalTakeSnapShot(JSContext *context, uintN argc, jsval *vp)
{
    OOJS_NATIVE_ENTER(context)
    
    NSString                *value = nil;
    NSMutableCharacterSet   *allowedChars = (NSMutableCharacterSet *)[NSMutableCharacterSet alphanumericCharacterSet];
    BOOL                    result = NO;    
    
    [allowedChars addCharactersInString:@"_-"];
    
    if (argc > 0)
    {
        value = OOStringFromJSValue(context, OOJS_ARGV[0]);
        if (EXPECT_NOT(value == nil || [value rangeOfCharacterFromSet:[allowedChars invertedSet]].location != NSNotFound))
        {
            OOJSReportBadArguments(context, nil, @"takeSnapShot", argc, OOJS_ARGV, nil, @"alphanumeric string");
            return NO;
        }
    }
    
    NSString                *playerFileDirectory = [[NSFileManager defaultManager] defaultCommanderPath];
    NSDictionary            *attr = [[NSFileManager defaultManager] oo_fileSystemAttributesAtPath:playerFileDirectory];
    
    if (attr != nil)
    {
        double freeSpace = [attr oo_doubleForKey:NSFileSystemFreeSize];
        if (freeSpace < 1073741824) // less than 1 GB free on disk?
        {
            OOJSReportWarning(context, @"takeSnapShot: function disabled when free disk space is less than 1GB.");
            OOJS_RETURN_BOOL(NO);
        }
    }
    
    
    OOJS_BEGIN_FULL_NATIVE(context)
    result = [[UNIVERSE gameView] snapShot:value];
    OOJS_END_FULL_NATIVE
    
    OOJS_RETURN_BOOL(result);
    
    OOJS_NATIVE_EXIT
}
#endif
 
// autoAIForRole(role : String) : String
static JSBool GlobalAutoAIForRole(JSContext *context, uintN argc, jsval *vp)
{
    OOJS_NATIVE_ENTER(context)
    
    NSString            *string = nil;
    
    if (argc > 0)  string = OOStringFromJSValue(context,OOJS_ARGV[0]);
    if (string == nil)
    {
        OOJSReportBadArguments(context, nil, @"autoAIForRole", MIN(argc, 1U), OOJS_ARGV, nil, @"string");
        return NO;
    }
 
    NSDictionary *autoAIMap = [ResourceManager dictionaryFromFilesNamed:@"autoAImap.plist" inFolder:@"Config" andMerge:YES];
    NSString *autoAI = [autoAIMap oo_stringForKey:string];
 
    OOJS_RETURN_OBJECT(autoAI);
    
    OOJS_NATIVE_EXIT
}
 
// pauseGame() : Boolean
static JSBool GlobalPauseGame(JSContext *context, uintN argc, jsval *vp)
{
    OOJS_NATIVE_ENTER(context)
    
    BOOL            result = NO;
    PlayerEntity    *player = PLAYER;
    
    if (player)
    {
        OOGUIScreenID guiScreen = [player guiScreen];
        
        if  (guiScreen != GUI_SCREEN_LONG_RANGE_CHART &&
             guiScreen != GUI_SCREEN_MISSION &&
             guiScreen != GUI_SCREEN_REPORT &&
             guiScreen != GUI_SCREEN_KEYBOARD_ENTRY &&
             guiScreen != GUI_SCREEN_SAVE)
        {
            [UNIVERSE pauseGame];
            result = YES;
        }
    }
    
    OOJS_RETURN_BOOL(result);
    
    OOJS_NATIVE_EXIT
}