#include "integration/test.h"

#include <mega/common/error_or.h>
#include <mega/common/node_info.h>
#include <mega/common/testing/cloud_path.h>
#include <mega/common/testing/directory.h>
#include <mega/common/testing/model.h>
#include <mega/fuse/common/logging.h>
#include <mega/fuse/common/mount_info.h>
#include <mega/fuse/common/testing/parameters.h>
#include <mega/fuse/common/testing/real_client.h>
#include <mega/fuse/common/testing/test.h>
#include <mega/fuse/common/testing/utility.h>
#include <mega/fuse/platform/platform.h>

namespace mega
{
namespace fuse
{
namespace testing
{

using namespace common::testing;

Error Test::regenerate(Client& client,
                       Client& sharee,
                       const Model& model,
                       accesslevel_t permissions)
{
    // Convenience.
    using ::testing::AnyOf;

    // Make sure our two clients are friends.
    auto befriended = befriend(client, sharee, mDefaultTimeout);
    EXPECT_EQ(befriended, API_OK);

    // Clients don't want to be friends.
    if (HasFailure())
        return befriended;

    // Check if the test root is present.
    auto handle = client.handle("/x");

    EXPECT_THAT(handle.errorOr(API_OK), AnyOf(API_FUSE_ENOTFOUND, API_OK));

    if (HasFailure())
        return handle.error();

    // Create the test root if necessary.
    if (!handle)
    {
        // Try and create the test root.
        auto created = client.makeDirectory("x", "/");

        // Make sure the test root was created.
        EXPECT_EQ(created.errorOr(API_OK), API_OK);

        // Couldn't create test root.
        if (HasFailure())
            return created.error();

        // Latch the test root's handle.
        handle = *created;
    }

    // Try and share the test root with our friend.
    auto shared = client.share(sharee.email(), *handle, permissions);

    // Make sure the test root was shared.
    EXPECT_EQ(shared, API_OK);

    // Couldn't share the test root with our friend.
    if (HasFailure())
        return shared;

    // Cloud hasn't changed state.
    if (Model::from(client, "/x/s").match(model))
        return API_OK;

    // Clear current cloud content.
    auto removed = client.removeAll("/x");

    // Make sure cloud content was removed.
    EXPECT_THAT(removed, AnyOf(API_FUSE_ENOTFOUND, API_OK));

    // Couldn't clear cloud content.
    if (HasFailure())
        return removed;

    // Create scratch directory.
    Directory directory(randomName(), mScratchPath);

    // Populate scratch directory.
    model.populate(directory.path());

    // Upload new cloud content.
    auto uploaded = client.upload("/x", directory.path() / "s");

    // Make sure content was uploaded.
    EXPECT_EQ(uploaded.errorOr(API_OK), API_OK);

    // Couldn't upload cloud content.
    if (HasFailure())
        return uploaded.error();

    // Wait until our friend sees our new content.
    EXPECT_TRUE(waitFor(
        [&]()
        {
            return Model::from(sharee, *uploaded).match(model);
        },
        mDefaultTimeout));

    // Friend never saw our uploaded content.
    if (HasFailure())
        return LOCAL_ETIMEOUT;

    // Let the caller know that everything's set up.
    return API_OK;
}

Model Test::mModel;

Watchdog Test::mWatchdog(logger());

Test::ClientPtrArray Test::mClients;

Test::PathArray Test::mMountPaths;

Test::PathArray Test::mSentinelPaths;

// Most tests run for less than 10 seconds so these limits should be fine.
static constexpr auto MaxTestCleanupTime = std::chrono::minutes(15);
static constexpr auto MaxTestRunTime = std::chrono::minutes(15);
static constexpr auto MaxTestSetupTime = std::chrono::minutes(15);

bool Test::DoSetUp(const Parameters& parameters)
{
    // Arm the watchdog.
    ScopedWatch watch(mWatchdog, MaxTestRunTime);

    // Make sure the clients are set up.
    allOf(mClients,
          [&](const ClientPtr& client)
          {
              auto exists = false;

              // The client should exist.
              EXPECT_TRUE((exists = !!client));

              if (!exists)
                  return false;

              auto loggedIn = false;

              // The client should be logged in.
              EXPECT_TRUE((loggedIn = client->loggedIn() == FULLACCOUNT));

              if (!loggedIn)
                  return false;

              auto idle = false;

              // The client should contain no mounts.
              EXPECT_TRUE((idle = client->mounts(false).empty()));

              // Specify whether files should be versioned.
              client->useVersioning(parameters.mUseVersioning);

              return idle;
          });

    // One or more clients isn't set up.
    if (HasFailure())
        return false;

    // Verify that the sentinels are no longer visible.
    allOf(mSentinelPaths,
          [](const Path& path)
          {
              auto error = std::error_code();
              auto result = false;

              // Sentinel shouldn't exist.
              EXPECT_TRUE((result = !fs::exists(path, error) && !error));

              return result;
          });

    // One or more sentinels exist.
    if (HasFailure())
        return false;

    using ClientEntry = std::pair<Client*, accesslevel_t>;

    ClientEntry entries[] = {{ClientR().get(), RDONLY}, {ClientW().get(), FULL}}; // entries

    // Regenerate clients as necessary.
    allOf(entries,
          [](ClientEntry& entry)
          {
              auto populated = API_OK;
              auto sharee = ClientS().get();

              auto client = entry.first;
              auto permissions = entry.second;

              // Regenerate state if necessary.
              EXPECT_EQ((populated = regenerate(*client, *sharee, mModel, permissions)), API_OK);

              return populated == API_OK;
          });

    // Couldn't regenerate read-write state.
    if (HasFailure())
        return false;

    // Don't disarm the watchdog.
    watch.release();

    // We're done.
    return true;
}

bool Test::DoTearDown()
{
    // Make sure all mounts have been removed.
    auto result = allOf(mClients,
                        [](ClientPtr& client)
                        {
                            // Client doesn't exist.
                            if (!client)
                                return false;

                            auto emptied = MOUNT_SUCCESS;

                            // Make sure all mounts have been removed.
                            EXPECT_EQ((emptied = client->removeMounts(true)), MOUNT_SUCCESS);

                            // Couldn't remove all mounts.
                            if (emptied != MOUNT_SUCCESS)
                                return false;

                            auto empty = false;

                            // Verify that all mounts have been removed.
                            EXPECT_TRUE((empty = client->mounts(false).empty()));

                            return empty;
                        });

    // Disarm the watchdog.
    mWatchdog.disarm();

    return result;
}

void Test::SetUp()
{
    ASSERT_TRUE(DoSetUp(STANDARD_VERSIONED));
}

void Test::SetUpTestSuite()
{
    common::testing::Test<TestTraits>::SetUpTestSuite();

    // Arm the watchdog.
    ScopedWatch watch(mWatchdog, MaxTestSetupTime);

    ClientPtrArray clients;

    // Create clients and log them in.
    {
        std::vector<std::string> names = {"sharee", "read-write", "read-only"}; // names

        // Create clients and log them in.
        allOf(clients,
              [&names](ClientPtr& client)
              {
                  // Try and create client.
                  EXPECT_TRUE((client = CreateClient(names.back())));

                  // Couldn't create client.
                  if (!client)
                      return false;

                  // Pop name.
                  names.pop_back();

                  auto loggedIn = API_OK;

                  // Try and log the client in.
                  EXPECT_EQ((loggedIn = client->login(names.size())), API_OK);

                  // Couldn't log in.
                  if (loggedIn != API_OK)
                      return false;

                  return true;
              });

        // Couldn't create or log in a client.
        ASSERT_FALSE(HasFailure());
    }

    // Prepare model.
    auto model = Model::generate("s", 3, 2, 2);

    model.add(Model::directory("sentinel"), "s");

    // Compute mount paths
    PathArray mountPaths = {/*  o */ clients[CT_READ_WRITE]->storagePath() / "observer",
                            /* os */ clients[CT_SHAREE]->storagePath() / "read-write-observer",
                            /*  r */ clients[CT_READ_ONLY]->storagePath() / "actor",
                            /* rs */ clients[CT_SHAREE]->storagePath() / "read-only-actor",
                            /*  w */ clients[CT_READ_WRITE]->storagePath() / "actor",
                            /* ws */ clients[CT_SHAREE]->storagePath() /
                                "read-write-actor"}; // mountPaths

    // Make sure mount paths exist.
    UNIX_ONLY({
        // Make sure mount paths exist.
        allOf(mountPaths,
              [](const Path& path)
              {
                  std::error_code error;
                  EXPECT_TRUE(fs::create_directories(path, error) || !error);
                  return !HasFailure();
              });

        // Couldn't create mount paths.
        ASSERT_FALSE(HasFailure());
    });

    PathArray sentinelPaths = mountPaths;

    // Compute sentinel paths.
    for (auto& path: sentinelPaths)
        path /= "sentinel";

    // Persist clients, model and paths.
    mClients = std::move(clients);
    mModel = std::move(model);
    mMountPaths = std::move(mountPaths);
    mSentinelPaths = std::move(sentinelPaths);
}

void Test::TearDown()
{
    ASSERT_TRUE(DoTearDown());
}

void Test::TearDownTestSuite()
{
    // Arm watchdog.
    ScopedWatch watch(mWatchdog, MaxTestCleanupTime);

    // Destroy clients.
    for (auto& client: mClients)
        client.reset();
}

} // testing
} // fuse
} // mega
