// Copyright 2012 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "content/renderer/dom_automation_controller.h"

#include "base/json/json_string_value_serializer.h"
#include "base/strings/string_util.h"
#include "content/public/renderer/render_frame.h"
#include "content/renderer/v8_value_converter_impl.h"
#include "gin/handle.h"
#include "gin/object_template_builder.h"
#include "third_party/blink/public/common/associated_interfaces/associated_interface_provider.h"
#include "third_party/blink/public/platform/scheduler/web_agent_group_scheduler.h"
#include "third_party/blink/public/web/web_local_frame.h"
#include "v8/include/cppgc/allocation.h"
#include "v8/include/v8-context.h"
#include "v8/include/v8-cppgc.h"

namespace content {

// static
void DomAutomationController::Install(RenderFrame* render_frame,
                                      blink::WebLocalFrame* frame) {
  v8::Isolate* isolate =
      render_frame->GetWebFrame()->GetAgentGroupScheduler()->Isolate();
  v8::HandleScope handle_scope(isolate);
  v8::Local<v8::Context> context = frame->MainWorldScriptContext();
  if (context.IsEmpty())
    return;

  v8::Context::Scope context_scope(context);

  auto* controller = cppgc::MakeGarbageCollected<DomAutomationController>(
      isolate->GetCppHeap()->GetAllocationHandle(), render_frame);
  v8::Local<v8::Object> wrapper =
      controller->GetWrapper(isolate).ToLocalChecked();

  v8::Local<v8::Object> global = context->Global();
  global
      ->Set(context, gin::StringToV8(isolate, "domAutomationController"),
            wrapper)
      .Check();
}

DomAutomationController::DomAutomationController(RenderFrame* render_frame)
    : RenderFrameObserver(render_frame) {}

DomAutomationController::~DomAutomationController() = default;

void DomAutomationController::Dispose() {
  RenderFrameObserver::Dispose();
}

gin::ObjectTemplateBuilder DomAutomationController::GetObjectTemplateBuilder(
    v8::Isolate* isolate) {
  return gin::Wrappable<DomAutomationController>::GetObjectTemplateBuilder(
             isolate)
      .SetMethod("send", &DomAutomationController::SendMsg);
}

void DomAutomationController::OnDestruct() {}

void DomAutomationController::DidCreateScriptContext(
    v8::Local<v8::Context> context,
    int32_t world_id) {
  // Add the domAutomationController to isolated worlds as well.
  v8::Isolate* isolate =
      render_frame()->GetWebFrame()->GetAgentGroupScheduler()->Isolate();
  v8::HandleScope handle_scope(isolate);
  if (context.IsEmpty())
    return;

  v8::Context::Scope context_scope(context);

  // Reuse this object instead of creating others
  v8::Local<v8::Object> wrapper = GetWrapper(isolate).ToLocalChecked();

  v8::Local<v8::Object> global = context->Global();
  global
      ->Set(context, gin::StringToV8(isolate, "domAutomationController"),
            wrapper)
      .Check();
}

bool DomAutomationController::SendMsg(const gin::Arguments& args) {
  if (!render_frame())
    return false;

  std::string json;
  JSONStringValueSerializer serializer(&json);
  std::unique_ptr<base::Value> value;

  // Warning: note that JSON officially requires the root-level object to be
  // an object (e.g. {foo:3}) or an array, while here we're serializing
  // strings, bools, etc. to "JSON".  This only works because (a) the JSON
  // writer is lenient, and (b) on the receiving side we wrap the JSON string
  // in square brackets, converting it to an array, then parsing it and
  // grabbing the 0th element to get the value out.
  if (!args.PeekNext().IsEmpty()) {
    V8ValueConverterImpl conv;
    value =
        conv.FromV8Value(args.PeekNext(), args.isolate()->GetCurrentContext());
  } else {
    NOTREACHED() << "No arguments passed to domAutomationController.send";
  }

  if (!value || !serializer.Serialize(*value))
    return false;

  GetDomAutomationControllerHost()->DomOperationResponse(json);
  return true;
}

const gin::WrapperInfo* DomAutomationController::wrapper_info() const {
  return &kWrapperInfo;
}

const mojo::AssociatedRemote<mojom::DomAutomationControllerHost>&
DomAutomationController::GetDomAutomationControllerHost() {
  if (!dom_automation_controller_host_) {
    render_frame()->GetRemoteAssociatedInterfaces()->GetInterface(
        &dom_automation_controller_host_);
  }
  return dom_automation_controller_host_;
}

}  // namespace content