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import {Injectable} from 'angular2/di';

import {isPresent, print} from 'angular2/src/facade/lang';

import {ListWrapper, isListLikeIterable} from 'angular2/src/facade/collection';

/**

* Provides a hook for centralized exception handling.

*

* The default implementation of `ExceptionHandler` prints error messages to the `Console`. To intercept error handling,

* write a custom exception handler that replaces this default as appropriate for your app.

*

* # Example

*

* ```javascript

* @Component({

* selector: 'my-app',

* injectables: [

* bind(ExceptionHandler).toClass(MyExceptionHandler)

* ]

* })

* @View(...)

* class MyApp { ... }

*

*

* class MyExceptionHandler implements ExceptionHandler {

* call(error, stackTrace = null, reason = null) {

* // do something with the exception

* }

* }

*

* ```

*

* @exportedAs angular2/core

*/

@Injectable()

export class ExceptionHandler {

call(error, stackTrace = null, reason = null) {

var longStackTrace = isListLikeIterable(stackTrace) ? ListWrapper.join(stackTrace, "\n\n") : stackTrace;

var reasonStr = isPresent(reason) ? `\n${reason}` : '';

print(`${error}${reasonStr}\nSTACKTRACE:\n${longStackTrace}`);

}

}