//
//  TNSExceptionHandler.h
//  NativeScript
//
//  Created by Jason Zhekov on 2/1/16.
//  Copyright © 2016 Telerik. All rights reserved.
//

#ifndef TNSExceptionHandler_h
#define TNSExceptionHandler_h

#import <JavaScriptCore/JavaScriptCore.h>
#import <NativeScript/NativeScript.h>

static NSUncaughtExceptionHandler* oldExceptionHandler = NULL;

static void TNSObjectiveCUncaughtExceptionHandler(NSException* currentException) {
    TNSRuntime* runtime = [TNSRuntime current];
    if (runtime) {
        JSGlobalContextRef context = runtime.globalContext;
        JSObjectRef globalObject = JSContextGetGlobalObject(context);

        JSStringRef uncaughtPropertyName = JSStringCreateWithUTF8CString("onerror"); // Keep in sync with JSErrors.mm
        JSValueRef uncaughtCallback = JSObjectGetProperty(context, globalObject, uncaughtPropertyName, NULL);
        JSStringRelease(uncaughtPropertyName);

        NSDictionary* userInfo = currentException.userInfo;
        // check whether the exception is comming form fatalErrorBeforeShutdown method
        BOOL exceptionAlreadyReported = (userInfo && userInfo[@"sender"] && [userInfo[@"sender"] isEqualToString:@"reportFatalErrorBeforeShutdown"]);
        if (!exceptionAlreadyReported && JSValueIsUndefined(context, uncaughtCallback)) {
            uncaughtPropertyName = JSStringCreateWithUTF8CString("__onUncaughtError"); // Keep in sync with JSErrors.mm
            uncaughtCallback = JSObjectGetProperty(context, globalObject, uncaughtPropertyName, NULL);
            JSStringRelease(uncaughtPropertyName);
        }

        if (!JSValueIsUndefined(context, uncaughtCallback)) {
            JSStringRef reason = JSStringCreateWithUTF8CString(currentException.reason.UTF8String);
            JSObjectRef error = JSObjectMakeError(
                context, 1, (JSValueRef[]){ JSValueMakeString(context, reason) }, NULL);
            JSStringRelease(reason);

            JSValueRef wrappedException = [runtime convertObject:currentException];
            JSStringRef nativeExceptionPropertyName = JSStringCreateWithUTF8CString("nativeException");
            JSObjectSetProperty(context, error, nativeExceptionPropertyName,
                                wrappedException, kJSPropertyAttributeNone, NULL);
            JSStringRelease(nativeExceptionPropertyName);

            JSValueRef callError = NULL;
            JSObjectCallAsFunction(context, (JSObjectRef)uncaughtCallback, NULL, 1,
                                   (JSValueRef[]){ error }, &callError);
            if (callError) {
                JSStringRef callErrorMessage = JSValueToStringCopy(context, callError, NULL);
                NSLog(@"Error executing uncaught error handler: %@",
                      CFBridgingRelease(JSStringCopyCFString(CFAllocatorGetDefault(),
                                                             callErrorMessage)));
                JSStringRelease(callErrorMessage);
            }
        }

        NSLog(@"*** JavaScript call stack:\n(\n%@\n)", [runtime getCurrentStack]);
    }

    if (oldExceptionHandler) {
        oldExceptionHandler(currentException);
    }
}

static void TNSInstallExceptionHandler() {
    oldExceptionHandler = NSGetUncaughtExceptionHandler();
    NSSetUncaughtExceptionHandler(TNSObjectiveCUncaughtExceptionHandler);
}

#endif /* TNSExceptionHandler_h */