// Copyright 2019 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/intl/cpp/fidl.h>
#include <fuchsia/modular/cpp/fidl.h>
#include <fuchsia/modular/testing/cpp/fidl.h>
#include <lib/modular/testing/cpp/fake_agent.h>
#include <lib/modular/testing/cpp/fake_component.h>
#include <lib/syslog/cpp/macros.h>

#include <src/modular/lib/modular_test_harness/cpp/test_harness_fixture.h>

#include "intl_property_provider_test_client.h"

namespace {

constexpr char kFakeRunnerUrl[] = "fuchsia-pkg://fuchsia.com/fake_runner#meta/fake_runner.cmx";

// A module that specifies kFakeRunnerUrl as the runner to be used to launch
// itself. The module doesn't have any functionality besides starting up and
// tearing down.
constexpr char kModuleWithFakeRunnerUrl[] =
    "fuchsia-pkg://fuchsia.com/module_with_fake_runner#meta/module_with_fake_runner.cmx";

// A runner that is used to count the number of times it is launched, when starting
// multiple instances of the same module in different stories.
class FakeRunner : public modular_testing::FakeComponent, fuchsia::sys::Runner {
 public:
  FakeRunner() : FakeComponent({.url = kFakeRunnerUrl}) {}

  int module_started_count() { return module_started_count_; }

 protected:
  void OnCreate(fuchsia::sys::StartupInfo startup_info) override {
    runner_intercepted_count_++;
    EXPECT_EQ(1, runner_intercepted_count_);
    component_context()->outgoing()->AddPublicService<fuchsia::sys::Runner>(
        [this](fidl::InterfaceRequest<fuchsia::sys::Runner> request) {
          bindings_.AddBinding(this, std::move(request));
        });
  }

  // |fuchsia::sys::Runner|
  void StartComponent(
      fuchsia::sys::Package package, fuchsia::sys::StartupInfo startup_info,
      ::fidl::InterfaceRequest<fuchsia::sys::ComponentController> controller) override {
    module_started_count_++;
  }

  fidl::BindingSet<fuchsia::sys::Runner> bindings_;
  int runner_intercepted_count_ = 0;
  int module_started_count_ = 0;
};

// Minimal agent that connects to `fuchsia.intl.PropertyProvider` and retrieves a `Profile`.
class StoriesShareSessionRunnersTest : public modular_testing::TestHarnessFixture {
 protected:
  void SetUp() override {
    fake_agent_url_ = modular_testing::TestHarnessBuilder::GenerateFakeUrl(
        "stories_share_session_runners_test_agent");

    fake_agent_ = std::make_unique<modular_testing::FakeAgent>(modular_testing::FakeComponent::Args{
        .url = fake_agent_url_,
        .sandbox_services =
            {
                fuchsia::modular::ComponentContext::Name_,
                fuchsia::intl::PropertyProvider::Name_,
            },
    });

    fuchsia::modular::testing::TestHarnessSpec spec;
    spec.mutable_sessionmgr_config()->set_session_agents({fake_agent_url_});

    builder_ = std::make_unique<modular_testing::TestHarnessBuilder>(std::move(spec));

    builder_->InterceptComponent(fake_agent_->BuildInterceptOptions());
    builder_->InterceptComponent(
        {.url = kFakeRunnerUrl,
         .sandbox_services =
             {

                 fuchsia::modular::ComponentContext::Name_,
                 fuchsia::intl::PropertyProvider::Name_,
             },
         .launch_handler =
             [this](fuchsia::sys::StartupInfo startup_info,
                    fidl::InterfaceHandle<fuchsia::modular::testing::InterceptedComponent>
                        intercepted_component) mutable {
               runners_requested_++;
               // This test should ensure the fake_runner_ is requested only once, no matter how
               // many stories or modules request it.
               EXPECT_EQ(fake_runner_, nullptr);  // don't ASSERT from void lambda
               if (fake_runner_ != nullptr) {
                 // If unexpected second request, create a new runner so module construction will
                 // succeed in the new story, but fail the test based on |runners_requested_| > 1.
                 // (First, move the original runner so it isn't destructed on unique_ptr
                 // overwrite.)
                 saved_runner_ = std::move(fake_runner_);
               }
               fake_runner_ = std::make_unique<FakeRunner>();
               fake_runner_->BuildInterceptOptions().launch_handler(
                   std::move(startup_info), std::move(intercepted_component));
             }});
    builder_->BuildAndRun(test_harness());
  }

  void AssertIntlPropertyProvider(const modular_testing::FakeComponent* fake_component) {
    modular_tests::IntlPropertyProviderTestClient intl_client{fake_component};

    ASSERT_EQ(ZX_OK, intl_client.Connect());

    intl_client.LoadProfile();
    RunLoopUntil([&] { return intl_client.HasProfile() || intl_client.HasError(); });
    ASSERT_TRUE(intl_client.HasProfile());

    fuchsia::intl::Profile* profile = intl_client.Profile();
    ASSERT_TRUE(profile->has_locales());
    ASSERT_TRUE(profile->has_calendars());
    ASSERT_TRUE(profile->has_time_zones());
    ASSERT_TRUE(profile->has_temperature_unit());
  }

  std::string fake_agent_url_;
  std::unique_ptr<modular_testing::FakeAgent> fake_agent_;
  std::unique_ptr<FakeRunner> fake_runner_;
  std::unique_ptr<FakeRunner> saved_runner_;
  int runners_requested_ = 0;
  std::unique_ptr<modular_testing::TestHarnessBuilder> builder_;
};

// Tests that the same mod started in different stories will reuse the
// runner started by the first mod because stories share the same environment.
TEST_F(StoriesShareSessionRunnersTest, ModReusesRunner) {
  auto first_intent = fuchsia::modular::Intent{.handler = kModuleWithFakeRunnerUrl,
                                               .action = "com.google.fuchsia.module.runner"};

  // Add a mod that will be launched via a fake runner
  modular_testing::AddModToStory(test_harness(), "first_story", "mod_name",
                                 std::move(first_intent));

  RunLoopUntil([&] { return !!fake_runner_ && fake_runner_->module_started_count() > 0; });
  EXPECT_EQ(1, runners_requested_);
  EXPECT_EQ(1, fake_runner_->module_started_count());

  // Add the same mod and check that the runner wasn't launched again
  auto second_intent = fuchsia::modular::Intent{.handler = kModuleWithFakeRunnerUrl,
                                                .action = "com.google.fuchsia.module.runner"};
  modular_testing::AddModToStory(test_harness(), "second_story", "mod_name",
                                 std::move(second_intent));
  RunLoopUntil([&] { return fake_runner_->module_started_count() > 1 || runners_requested_ > 1; });
  EXPECT_EQ(2, fake_runner_->module_started_count());
  ASSERT_EQ(1, runners_requested_);

  // Add the same mod and check that the runner wasn't launched again
  auto third_intent = fuchsia::modular::Intent{.handler = kModuleWithFakeRunnerUrl,
                                               .action = "com.google.fuchsia.module.runner"};
  modular_testing::AddModToStory(test_harness(), "second_story", "mod_name_2_of_2",
                                 std::move(third_intent));
  RunLoopUntil(
      [&] { return fake_runner_->module_started_count() > 2 || runners_requested_ > 1 > 0; });
  EXPECT_EQ(3, fake_runner_->module_started_count());
  ASSERT_EQ(1, runners_requested_);

  // Add the same mod and check that the runner wasn't launched again
  auto fourth_intent = fuchsia::modular::Intent{.handler = kModuleWithFakeRunnerUrl,
                                                .action = "com.google.fuchsia.module.runner"};
  modular_testing::AddModToStory(test_harness(), "third_story", "mod_name",
                                 std::move(fourth_intent));
  RunLoopUntil([&] { return fake_runner_->module_started_count() > 3 || runners_requested_ > 1; });
  EXPECT_EQ(4, fake_runner_->module_started_count());
  ASSERT_EQ(1, runners_requested_);
}

// Tests that a runner can still access the fuchsia::intl::PropertyProvider from its environment.
TEST_F(StoriesShareSessionRunnersTest, RunnerCanAccessIntlPropertyProvider) {
  auto intent = fuchsia::modular::Intent{.handler = kModuleWithFakeRunnerUrl,
                                         .action = "com.google.fuchsia.module.runner"};

  // Add a mod that will be launched via a fake runner
  modular_testing::AddModToStory(test_harness(), "story", "mod_name", std::move(intent));

  RunLoopUntil([&] { return !!fake_runner_ && fake_runner_->module_started_count() > 0; });

  AssertIntlPropertyProvider(fake_runner_.get());
}

// Tests that agents can get the intl::PropertyProvider exposed by Sessionmgr.
TEST_F(StoriesShareSessionRunnersTest, AgentGetsSessionmgrProvidedServices) {
  fuchsia::modular::ComponentContextPtr component_context;
  fuchsia::modular::testing::ModularService modular_service;
  modular_service.set_component_context(component_context.NewRequest());
  test_harness()->ConnectToModularService(std::move(modular_service));

  fuchsia::modular::AgentControllerPtr agent_controller;
  fuchsia::sys::ServiceProviderPtr agent_services;
  component_context->DeprecatedConnectToAgent(fake_agent_url_, agent_services.NewRequest(),
                                              agent_controller.NewRequest());

  RunLoopUntil([&] { return fake_agent_->is_running(); });

  AssertIntlPropertyProvider(fake_agent_.get());
}

}  // namespace