/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4; fill-column: 100 -*- */
/*
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/.
 */

#include <config.h>

#include "WOPIUploadConflictCommon.hpp"

#include <string>
#include <memory>

#include <Poco/Net/HTTPRequest.h>

#include "Util.hpp"
#include "Log.hpp"
#include "UnitHTTP.hpp"
#include "helpers.hpp"
#include "lokassert.hpp"

/// This test simulates a permanently-failing upload.
class UnitWOPIFailUpload : public WOPIUploadConflictCommon
{
    using Base = WOPIUploadConflictCommon;

    using Base::Phase;
    using Base::Scenario;

    using Base::OriginalDocContent;

    bool _unloadingModifiedDocDetected;

    static constexpr std::size_t LimitStoreFailures = 2;
    static constexpr bool SaveOnExit = true;

public:
    UnitWOPIFailUpload()
        : Base("UnitWOPIFailUpload", OriginalDocContent)
        , _unloadingModifiedDocDetected(true)
    {
    }

    void configure(Poco::Util::LayeredConfiguration& config) override
    {
        Base::configure(config);

        // Small value to shorten the test run time.
        config.setUInt("per_document.limit_store_failures", LimitStoreFailures);
        config.setBool("per_document.always_save_on_exit", SaveOnExit);
    }

    void onDocBrokerCreate(const std::string& docKey) override
    {
        Base::onDocBrokerCreate(docKey);

        if (_scenario == Scenario::VerifyOverwrite)
        {
            // By default, we don't upload when verifying (unless always_save_on_exit is set).
            //FIXME: we exit too soon without considering always_save_on_exit.
            setExpectedPutFile(/*SaveOnExit*/ 0);
        }
        else
        {
            // With always_save_on_exit=true and limit_store_failures=LimitStoreFailures,
            // we expect exactly two PutFile requests per document.
            setExpectedPutFile(LimitStoreFailures);
        }
    }

    void assertGetFileRequest(const Poco::Net::HTTPRequest& /*request*/) override
    {
        LOG_TST("Testing " << toString(_scenario));
        LOK_ASSERT_STATE(_phase, Phase::WaitLoadStatus);

        assertGetFileCount();

        //FIXME: check that unloading modified documents trigger test failure.
        // LOK_ASSERT_EQUAL_MESSAGE("Expected modified document detection to have triggered", true,
        //                          _unloadingModifiedDocDetected);
        _unloadingModifiedDocDetected = false; // Reset.
    }

    std::unique_ptr<http::Response>
    assertPutFileRequest(const Poco::Net::HTTPRequest& request) override
    {
        LOG_TST("Testing " << toString(_scenario));
        LOK_ASSERT_STATE(_phase, Phase::WaitDocClose);

        assertPutFileCount();

        const std::string wopiTimestamp = request.get("X-COOL-WOPI-Timestamp", std::string());
        const bool force = wopiTimestamp.empty(); // Without a timestamp we force to always store.

        switch (_scenario)
        {
            case Scenario::Disconnect:
                // When we disconnect, we unload the document. So SaveOnExit kicks in.
                LOK_ASSERT_EQUAL_MESSAGE("Unexpected overwritting the document in storage",
                                         SaveOnExit, force);
                break;
            case Scenario::CloseDiscard:
            case Scenario::SaveDiscard:
                break;
            case Scenario::SaveOverwrite:
            case Scenario::VerifyOverwrite:
                if (getCountPutFile() < getExpectedPutFile())
                {
                    // These are regular saves.
                    LOK_ASSERT_EQUAL_MESSAGE("Unexpected overwritting the document in storage",
                                             false, force);
                }
                else
                {
                    // The last one is the always_save_on_exit, and has to be forced.
                    LOK_ASSERT_EQUAL_MESSAGE("Expected forced overwritting the document in storage",
                                             true, force);
                }
                break;
        }

        // Internal Server Error.
        return Util::make_unique<http::Response>(http::StatusLine(500));
    }

    bool onDocumentModified(const std::string& message) override
    {
        LOG_TST("Testing " << toString(_scenario) << ": [" << message << ']');
        LOK_ASSERT_STATE(_phase, Phase::WaitModifiedStatus);

        TRANSITION_STATE(_phase, Phase::WaitDocClose);

        switch (_scenario)
        {
            case Scenario::Disconnect:
                // Just disconnect.
                LOG_TST("Disconnecting");
                deleteSocketAt(0);
                break;
            case Scenario::SaveDiscard:
            case Scenario::SaveOverwrite:
                // Save the document.
                LOG_TST("Saving the document");
                WSD_CMD("save dontTerminateEdit=0 dontSaveIfUnmodified=0");
                break;
            case Scenario::CloseDiscard:
                // Close the document.
                LOG_TST("Closing the document");
                WSD_CMD("closedocument");
                break;
            case Scenario::VerifyOverwrite:
                LOK_ASSERT_FAIL("Unexpected modification in " + toString(_scenario));
                break;
        }

        return true;
    }

    bool onDocumentError(const std::string& message) override
    {
        LOG_TST("Testing " << toString(_scenario) << ": [" << message << ']');
        LOK_ASSERT_STATE(_phase, Phase::WaitDocClose);

        LOK_ASSERT_EQUAL_MESSAGE("Expect only documentconflict errors",
                                 std::string("error: cmd=storage kind=savefailed"), message);

        // Close the document.
        LOG_TST("Closing the document");
        WSD_CMD("closedocument");

        return true;
    }

    // Called when we have modified document data at exit.
    void fail(const std::string& reason) override
    {
        LOG_TST("Modified document being unloaded: " << reason);

        // We expect this to happen only with the disonnection test,
        // because only in that case there is no user input.
        LOK_ASSERT_MESSAGE("Expected reason to be 'Data-loss detected'",
                           Util::startsWith(reason, "Data-loss detected"));
        LOK_ASSERT_MESSAGE("Expected to be in Phase::WaitDocClose but was " + toString(_phase),
                           _phase == Phase::WaitDocClose);
        _unloadingModifiedDocDetected = true;
    }

    // Wait for clean unloading.
    void onDocBrokerDestroy(const std::string& docKey) override
    {
        LOG_TST("Testing " << toString(_scenario) << " with dockey [" << docKey << "] closed.");
        LOK_ASSERT_STATE(_phase, Phase::WaitDocClose);

        // Uploading fails and we can't have anything but the original.
        LOK_ASSERT_EQUAL_MESSAGE("Unexpected contents in storage", std::string(OriginalDocContent),
                                 getFileContent());

        Base::onDocBrokerDestroy(docKey);
    }
};

UnitBase* unit_create_wsd(void) { return new UnitWOPIFailUpload(); }

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