// Copyright 2019 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "third_party/blink/renderer/core/html/portal/portal_activate_event.h"

#include <utility>
#include "third_party/blink/public/mojom/portal/portal.mojom-blink.h"
#include "third_party/blink/renderer/bindings/core/v8/script_value.h"
#include "third_party/blink/renderer/bindings/core/v8/v8_portal_activate_event_init.h"
#include "third_party/blink/renderer/core/dom/document.h"
#include "third_party/blink/renderer/core/event_type_names.h"
#include "third_party/blink/renderer/core/frame/local_frame.h"
#include "third_party/blink/renderer/core/html/portal/html_portal_element.h"
#include "third_party/blink/renderer/core/messaging/message_port.h"
#include "third_party/blink/renderer/platform/bindings/script_state.h"
#include "third_party/blink/renderer/platform/bindings/v8_per_isolate_data.h"

namespace blink {

PortalActivateEvent* PortalActivateEvent::Create(
    LocalFrame* frame,
    const base::UnguessableToken& predecessor_portal_token,
    mojo::PendingAssociatedRemote<mojom::blink::Portal> predecessor_portal,
    mojo::PendingAssociatedReceiver<mojom::blink::PortalClient>
        predecessor_portal_client_receiver,
    scoped_refptr<SerializedScriptValue> data,
    MessagePortArray* ports,
    OnPortalActivatedCallback callback) {
  return MakeGarbageCollected<PortalActivateEvent>(
      frame->GetDocument(), predecessor_portal_token,
      std::move(predecessor_portal),
      std::move(predecessor_portal_client_receiver),
      SerializedScriptValue::Unpack(std::move(data)), ports,
      std::move(callback));
}

PortalActivateEvent* PortalActivateEvent::Create(
    const AtomicString& type,
    const PortalActivateEventInit* init) {
  return MakeGarbageCollected<PortalActivateEvent>(type, init);
}

PortalActivateEvent::PortalActivateEvent(
    Document* document,
    const base::UnguessableToken& predecessor_portal_token,
    mojo::PendingAssociatedRemote<mojom::blink::Portal> predecessor_portal,
    mojo::PendingAssociatedReceiver<mojom::blink::PortalClient>
        predecessor_portal_client_receiver,
    UnpackedSerializedScriptValue* data,
    MessagePortArray* ports,
    OnPortalActivatedCallback callback)
    : Event(event_type_names::kPortalactivate,
            Bubbles::kNo,
            Cancelable::kNo,
            base::TimeTicks::Now()),
      document_(document),
      predecessor_portal_token_(predecessor_portal_token),
      predecessor_portal_(std::move(predecessor_portal)),
      predecessor_portal_client_receiver_(
          std::move(predecessor_portal_client_receiver)),
      data_(data),
      ports_(ports),
      on_portal_activated_callback_(std::move(callback)) {}

PortalActivateEvent::PortalActivateEvent(const AtomicString& type,
                                         const PortalActivateEventInit* init)
    : Event(type, init) {
  if (init->hasData()) {
    data_from_init_.Set(V8PerIsolateData::MainThreadIsolate(),
                        init->data().V8Value());
  }

  // Remaining fields, such as |document_|, are left null.
  // All accessors and operations must handle this case.
}

PortalActivateEvent::~PortalActivateEvent() = default;

ScriptValue PortalActivateEvent::data(ScriptState* script_state) {
  v8::Isolate* isolate = script_state->GetIsolate();
  v8::HandleScope handle_scope(isolate);
  if (!data_ && data_from_init_.IsEmpty())
    return ScriptValue(isolate, v8::Null(isolate));

  auto result =
      v8_data_.insert(script_state, TraceWrapperV8Reference<v8::Value>());
  TraceWrapperV8Reference<v8::Value>& relevant_data =
      result.stored_value->value;

  if (!result.is_new_entry)
    return ScriptValue(isolate, relevant_data.NewLocal(isolate));

  v8::Local<v8::Value> value;
  if (data_) {
    SerializedScriptValue::DeserializeOptions options;
    options.message_ports = ports_.Get();
    value = data_->Deserialize(isolate, options);
  } else {
    DCHECK(!data_from_init_.IsEmpty());
    value = data_from_init_.GetAcrossWorld(script_state);
  }

  relevant_data.Set(isolate, value);
  return ScriptValue(isolate, value);
}

void PortalActivateEvent::Trace(Visitor* visitor) const {
  Event::Trace(visitor);
  visitor->Trace(document_);
  visitor->Trace(adopted_portal_);
  visitor->Trace(data_);
  visitor->Trace(ports_);
  visitor->Trace(data_from_init_);
  visitor->Trace(v8_data_);
}

const AtomicString& PortalActivateEvent::InterfaceName() const {
  return event_type_names::kPortalactivate;
}

HTMLPortalElement* PortalActivateEvent::adoptPredecessor(
    ExceptionState& exception_state) {
  if (!RuntimeEnabledFeatures::PortalsEnabled(
          document_ ? document_->GetExecutionContext() : nullptr)) {
    exception_state.ThrowDOMException(
        DOMExceptionCode::kNotSupportedError,
        "Portals is not enabled in this document.");
    return nullptr;
  }

  if (!predecessor_portal_) {
    exception_state.ThrowDOMException(
        DOMExceptionCode::kInvalidStateError,
        "The PortalActivateEvent is not associated with a predecessor browsing "
        "context");
    return nullptr;
  }

  DCHECK(!adopted_portal_);
  adopted_portal_ = MakeGarbageCollected<HTMLPortalElement>(
      *document_, predecessor_portal_token_, std::move(predecessor_portal_),
      std::move(predecessor_portal_client_receiver_));
  std::move(on_portal_activated_callback_)
      .Run(mojom::blink::PortalActivateResult::kPredecessorWasAdopted);
  return adopted_portal_;
}

void PortalActivateEvent::ExpireAdoptionLifetime() {
  // End the special privilege associated with any adopted portals.
  // This may destroy the guest contents.
  if (adopted_portal_) {
    adopted_portal_->ExpireAdoptionLifetime();

    // We no longer need to hold the adopted portal, so stop drop the GC
    // reference.
    adopted_portal_ = nullptr;
  }

  // End the special privilege associated with the predecessor contents if it
  // was not adopted. This may destroy the guest contents.
  if (predecessor_portal_) {
    std::move(on_portal_activated_callback_)
        .Run(mojom::blink::PortalActivateResult::kPredecessorWillUnload);
    predecessor_portal_.reset();
  }
}

}  // namespace blink