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 * modification, are permitted provided that the following conditions are
 * met:
 *
 *     * Redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer.
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 * copyright notice, this list of conditions and the following disclaimer
 * in the documentation and/or other materials provided with the
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 * contributors may be used to endorse or promote products derived from
 * this software without specific prior written permission.
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#include "bindings/core/v8/V8WorkerGlobalScopeEventListener.h"

#include "bindings/core/v8/V8Binding.h"
#include "bindings/core/v8/V8DOMWrapper.h"
#include "bindings/core/v8/V8Event.h"
#include "bindings/core/v8/V8EventTarget.h"
#include "bindings/core/v8/V8GCController.h"
#include "bindings/core/v8/V8ScriptRunner.h"
#include "bindings/core/v8/WorkerOrWorkletScriptController.h"
#include "core/inspector/InspectorInstrumentation.h"
#include "core/inspector/InspectorTraceEvents.h"
#include "core/workers/WorkerGlobalScope.h"

namespace blink {

V8WorkerGlobalScopeEventListener::V8WorkerGlobalScopeEventListener(
    bool isInline,
    ScriptState* scriptState)
    : V8EventListener(isInline, scriptState) {}

void V8WorkerGlobalScopeEventListener::handleEvent(ScriptState* scriptState,
                                                   Event* event) {
  WorkerOrWorkletScriptController* script =
      toWorkerGlobalScope(scriptState->getExecutionContext())
          ->scriptController();
  if (!script)
    return;

  ScriptState::Scope scope(scriptState);

  // Get the V8 wrapper for the event object.
  v8::Local<v8::Value> jsEvent =
      ToV8(event, scriptState->context()->Global(), isolate());
  if (jsEvent.IsEmpty())
    return;

  invokeEventHandler(scriptState, event,
                     v8::Local<v8::Value>::New(isolate(), jsEvent));
}

v8::Local<v8::Value> V8WorkerGlobalScopeEventListener::callListenerFunction(
    ScriptState* scriptState,
    v8::Local<v8::Value> jsEvent,
    Event* event) {
  ASSERT(!jsEvent.IsEmpty());
  v8::Local<v8::Function> handlerFunction = getListenerFunction(scriptState);
  v8::Local<v8::Object> receiver = getReceiverObject(scriptState, event);
  if (handlerFunction.IsEmpty() || receiver.IsEmpty())
    return v8::Local<v8::Value>();

  v8::Local<v8::Value> parameters[1] = {jsEvent};
  v8::MaybeLocal<v8::Value> maybeResult = V8ScriptRunner::callFunction(
      handlerFunction, scriptState->getExecutionContext(), receiver,
      WTF_ARRAY_LENGTH(parameters), parameters, isolate());

  TRACE_EVENT_INSTANT1(TRACE_DISABLED_BY_DEFAULT("devtools.timeline"),
                       "UpdateCounters", TRACE_EVENT_SCOPE_THREAD, "data",
                       InspectorUpdateCountersEvent::data());

  v8::Local<v8::Value> result;
  if (!maybeResult.ToLocal(&result))
    return v8::Local<v8::Value>();
  return result;
}

// FIXME: Remove getReceiverObject().
// This is almost identical to V8AbstractEventListener::getReceiverObject().
v8::Local<v8::Object> V8WorkerGlobalScopeEventListener::getReceiverObject(
    ScriptState* scriptState,
    Event* event) {
  v8::Local<v8::Object> listener =
      getListenerObject(scriptState->getExecutionContext());

  if (!listener.IsEmpty() && !listener->IsFunction())
    return listener;

  EventTarget* target = event->currentTarget();
  v8::Local<v8::Value> value =
      ToV8(target, scriptState->context()->Global(), isolate());
  if (value.IsEmpty())
    return v8::Local<v8::Object>();
  return v8::Local<v8::Object>::New(isolate(),
                                    v8::Local<v8::Object>::Cast(value));
}

}  // namespace blink