// Copyright 2018 The Fuchsia 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 <fuchsia/modular/cpp/fidl.h>
#include <lib/app_driver/cpp/module_driver.h>
#include <lib/async-loop/cpp/loop.h>
#include <lib/fsl/vmo/strings.h>

#include "peridot/public/lib/integration_testing/cpp/reporting.h"
#include "peridot/public/lib/integration_testing/cpp/testing.h"
#include "peridot/tests/common/defs.h"
#include "peridot/tests/intents/defs.h"

using modular::testing::Await;
using modular::testing::Signal;
using modular::testing::TestPoint;

namespace {

void StartModuleWithJsonParameter(
    fuchsia::modular::ModuleContext* const module_context,
    std::string module_name, std::string parameter_name,
    std::string parameter_content,
    fidl::InterfaceRequest<fuchsia::modular::ModuleController> request) {
  fuchsia::modular::Intent intent;
  intent.handler = kChildModuleUrl;
  intent.action = kChildModuleAction;

  {
    fuchsia::modular::IntentParameter intent_parameter;
    intent_parameter.name = parameter_name;
    intent_parameter.data = fuchsia::modular::IntentParameterData();
    fsl::SizedVmo vmo;
    FXL_CHECK(fsl::VmoFromString(parameter_content, &vmo));
    intent_parameter.data.set_json(std::move(vmo).ToTransport());
    intent.parameters.push_back(std::move(intent_parameter));
  }

  // This tests a null parameter name; it should be excluded from module
  // resolution altogether.
  {
    fuchsia::modular::IntentParameter intent_parameter;
    intent_parameter.name = nullptr;
    intent_parameter.data = fuchsia::modular::IntentParameterData();
    fsl::SizedVmo vmo;
    FXL_CHECK(fsl::VmoFromString(R"("")", &vmo));
    intent_parameter.data.set_json(std::move(vmo).ToTransport());
    intent.parameters.push_back(std::move(intent_parameter));
  }

  module_context->AddModuleToStory(
      module_name, std::move(intent), std::move(request), nullptr,
      [](const fuchsia::modular::StartModuleStatus) {});
}

// Cf. README.md for what this test does and how.
class TestModule {
 public:
  TestPoint initialized_{"Parent module initialized"};
  TestModule(modular::ModuleHost* module_host,
             fidl::InterfaceRequest<fuchsia::ui::app::ViewProvider>
                 view_provider_request)
      : module_host_(module_host),
        app_view_provider_(std::move(view_provider_request)) {
    modular::testing::Init(module_host->startup_context(), __FILE__);
    initialized_.Pass();
    TestStartWithModuleControllerRequest();
  }

  // Tests that a module which is started with an intent and exposes an intent
  // handler gets notified of the intent by the framework.
  TestPoint intent_was_handled_{"First intent was handled"};
  void TestStartWithModuleControllerRequest() {
    std::string json = "\"first\"";
    StartModuleWithJsonParameter(module_host_->module_context(),
                                 kChildModuleName, kIntentParameterName, json,
                                 child_module_.NewRequest());
    Await(kChildModuleHandledIntent + json, [this] {
      intent_was_handled_.Pass();
      TestStartSecondIntentSameParameter();
    });
  }

  // Tests that a second intent sent to an already running module with the same
  // parameters but different data notifies the intent handler of the new
  // intent.
  TestPoint second_intent_was_handled_{"Second intent was handled"};
  void TestStartSecondIntentSameParameter() {
    std::string json = "\"second\"";
    StartModuleWithJsonParameter(module_host_->module_context(),
                                 kChildModuleName, kIntentParameterName, json,
                                 child_module_second_.NewRequest());
    Await(kChildModuleHandledIntent + json, [this] {
      second_intent_was_handled_.Pass();
      TestStartThirdIntentDifferentParameter();
    });
  }

  // Tests that a third intent with different parameters is delivered to the
  // already running intent handler.
  TestPoint third_intent_was_handled_{"Third intent was handled"};
  void TestStartThirdIntentDifferentParameter() {
    std::string json = "\"third\"";
    StartModuleWithJsonParameter(
        module_host_->module_context(), kChildModuleName,
        kIntentParameterNameAlternate, json, child_module_second_.NewRequest());
    Await(kChildModuleHandledIntent + json, [this] {
      third_intent_was_handled_.Pass();
      Signal(modular::testing::kTestShutdown);
    });
  }

  // Called by ModuleDriver.
  TestPoint stopped_{"Parent module stopped"};
  void Terminate(fit::function<void()> done) {
    stopped_.Pass();
    modular::testing::Done(std::move(done));
  }

 private:
  modular::ModuleHost* module_host_;
  fuchsia::modular::ModuleControllerPtr child_module_;
  fuchsia::modular::ModuleControllerPtr child_module_second_;

  // We keep the view provider around so that story shell can hold a view for
  // us, but don't do anything with it.
  fidl::InterfaceRequest<fuchsia::ui::app::ViewProvider> app_view_provider_;

  FXL_DISALLOW_COPY_AND_ASSIGN(TestModule);
};

}  // namespace

int main(int /*argc*/, const char** /*argv*/) {
  async::Loop loop(&kAsyncLoopConfigAttachToThread);
  auto context = component::StartupContext::CreateFromStartupInfo();
  modular::ModuleDriver<TestModule> driver(context.get(),
                                           [&loop] { loop.Quit(); });
  loop.Run();
  return 0;
}