/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/*
 * 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/.
 */

#pragma once

#include <test/testlog.hpp>

#include <atomic>
#include <cassert>
#include <chrono>
#include <memory>
#include <string>

#include <LOOLWebSocket.hpp>
#include "net/Socket.hpp"

class UnitBase;
class UnitWSD;
class UnitKit;
class UnitTimeout;
class UnitHTTPServerRequest;
class UnitHTTPServerResponse;

class WebSocketHandler;

// Forward declaration to avoid pulling the world here.
namespace Poco
{
    class MemoryInputStream;

    namespace Net
    {
        class HTTPServerRequest;
        class HTTPServerResponse;
    }

    namespace Util
    {
        class LayeredConfiguration;
    }
}

class Session;
class StorageBase;

typedef UnitBase *(CreateUnitHooksFunction)();
extern "C" { UnitBase *unit_create_wsd(void); }
extern "C" { UnitBase *unit_create_kit(void); }
extern "C" { typedef struct _LibreOfficeKit LibreOfficeKit; }

/// Derive your WSD unit test / hooks from me.
class UnitBase
{
    friend UnitTimeout;
    friend UnitWSD;
    friend UnitKit;

protected:
    // ---------------- Helper API ----------------
    /// After this time we invoke 'timeout' default 30 seconds
    void setTimeout(std::chrono::milliseconds timeoutMilliSeconds);

    enum class TestResult
    {
        Failed,
        Ok,
        TimedOut
    };

    static const std::string testResultAsString(TestResult res)
    {
        switch (res)
        {
            case TestResult::Failed:
                return "Failed";
            case TestResult::Ok:
                return "Ok";
            case TestResult::TimedOut:
                return "TimedOut";
        }

        assert(!"Unknown TestResult entry.");
        return std::to_string(static_cast<int>(res));
    }

    /// Encourages the process to exit with this value (unless hooked)
    void exitTest(TestResult result);

    /// Fail the test with the given reason.
    void failTest(const std::string& reason)
    {
        LOG_TST("FAILURE: " << getTestname() << " finished: " << reason);
        exitTest(TestResult::Failed);
    }

    /// Pass the test with the given optional reason.
    void passTest(const std::string& reason = std::string())
    {
        LOG_TST("SUCCESS: " << getTestname() << " finished: " << reason);
        exitTest(TestResult::Ok);
    }

    UnitBase();
    UnitBase(std::string name)
        : UnitBase()
    {
        _testname = std::move(name);
    }

    virtual ~UnitBase();

public:
    enum class UnitType
    {
        Wsd,
        Kit
    };
    /// Load unit test hook shared library from this path
    static bool init(UnitType type, const std::string& unitLibPath);

    /// Do we have a unit test library hooking things & loaded
    static bool isUnitTesting();

    /// Tweak the return value from the process.
    virtual void returnValue(int& /* retValue */);

    /// Input message either for WSD or Kit
    virtual bool filterSessionInput(Session *, const char */* buffer */,
                                    int /* length */,
                                    std::unique_ptr< std::vector<char> > & /* replace */)
    {
        return false;
    }

    /// Message that is about to be sent via the websocket.
    /// To override, handle onFilterSendMessage or any of the onDocument...() handlers.
    bool filterSendMessage(const char* data, const std::size_t len, const WSOpCode code,
                           const bool flush, int& unitReturn)
    {
        const std::string message(data, len);

        if (Util::startsWith(message, "status:"))
        {
            if (onDocumentLoaded(message))
                return false;
        }
        else if (message == "statechanged: .uno:ModifiedStatus=true")
        {
            if (onDocumentModified(message))
                return false;
        }
        else if (Util::startsWith(message, "statechanged:"))
        {
            if (onDocumentStateChanged(message))
                return false;
        }
        else if (Util::startsWith(message, "error:"))
        {
            if (onDocumentError(message))
                return false;
        }

        return onFilterSendMessage(data, len, code, flush, unitReturn);
    }

    /// Hook the disk space check
    virtual bool filterCheckDiskSpace(const std::string & /* path */,
                                      bool & /* newResult */)
    {
        return false;
    }

    /// Trap and filter alerting all users
    virtual bool filterAlertAllusers(const std::string & /* msg */)
    {
        return false;
    }

    /// Custom response to a http request.
    virtual bool handleHttpRequest(const Poco::Net::HTTPRequest& /*request*/,
                                   Poco::MemoryInputStream& /*message*/,
                                   std::shared_ptr<StreamSocket>& /*socket*/)
    {
        return false;
    }

    /// Called when the document has been loaded,
    /// based on the "status:" message, in the context of filterSendMessage.
    /// Return true to stop further handling of messages.
    virtual bool onDocumentLoaded(const std::string&) { return false; }

    /// Called when the document's 'modified' status
    /// changes to true.
    /// Return true to stop further handling of messages.
    virtual bool onDocumentModified(const std::string&) { return false; }

    /// Called when the document has been saved.
    /// Return true to stop further handling of messages.
    virtual bool onDocumentSaved(const std::string&) { return false; }

    /// Called when the document issues a 'statechanged:' message.
    /// Return true to stop further handling of messages.
    virtual bool onDocumentStateChanged(const std::string&) { return false; }

    /// Called when the document issues an 'error:' message.
    /// Return true to stop further handling of messages.
    virtual bool onDocumentError(const std::string&) { return false; }

    /// If the test times out this gets invoked, the default just exits.
    virtual void timeout();

    std::chrono::milliseconds getTimeoutMilliSeconds() const
    {
        return _timeoutMilliSeconds;
    }

    static UnitBase& get()
    {
        assert(Global);
        return *Global;
    }

    static std::string getUnitLibPath() { return std::string(UnitLibPath); }

    const std::string& getTestname() const { return _testname; }
    void setTestname(const std::string& testname) { _testname = testname; }

private:
    void setHandle(void *dlHandle)
    {
        _dlHandle = dlHandle;
    }
    static UnitBase *linkAndCreateUnit(UnitType type, const std::string& unitLibPath);

    /// Handles messages sent via WebSocket.
    virtual bool onFilterSendMessage(const char* /*data*/, const std::size_t /*len*/,
                                     const WSOpCode /* code */, const bool /* flush */,
                                     int& /*unitReturn*/)
    {
        return false;
    }

    void *_dlHandle;
    static char *UnitLibPath;
    bool _setRetValue;
    int _retValue;
    std::chrono::milliseconds _timeoutMilliSeconds;
    static UnitBase *Global;
    UnitType _type;

    /// The name of the current test.
    std::string _testname;
};

/// Derive your WSD unit test / hooks from me.
class UnitWSD : public UnitBase
{
    bool _hasKitHooks;

public:
    UnitWSD(std::string testname = std::string());

    virtual ~UnitWSD();

    static UnitWSD& get()
    {
        assert(Global && Global->_type == UnitType::Wsd);
        return *static_cast<UnitWSD *>(Global);
    }

    enum class TestRequest
    {
        Client,
        Prisoner
    };
    /// Simulate an incoming request
    static void testHandleRequest(TestRequest type,
                                  UnitHTTPServerRequest& request,
                                  UnitHTTPServerResponse& response);
    /// Do we have hooks for the Kit too
    bool hasKitHooks() { return _hasKitHooks; }
    /// set in your unit if you want to be injected into the kit too.
    void setHasKitHooks() { _hasKitHooks = true; }

    // ---------------- WSD hooks ----------------

    /// Manipulate and modify the configuration before any usage.
    virtual void configure(Poco::Util::LayeredConfiguration& /* config */);

    /// Main-loop reached, time for testing.
    /// Invoked from loolwsd's main thread.
    void invokeTest()
    {
        try
        {
            // Invoke the test, expect no exceptions.
            invokeWSDTest();
        }
        catch (const std::exception& ex)
        {
            LOG_TST("ERROR: unexpected exception while invoking WSD Test: " << ex.what());
            exitTest(TestResult::Failed);
        }
        catch (...)
        {
            LOG_TST("ERROR: unexpected unknown exception while invoking WSD Test");
            exitTest(TestResult::Failed);
        }
    }

    /// When a new child kit process reports
    virtual void newChild(WebSocketHandler &/* socket */) {}
    /// Intercept createStorage
    virtual bool createStorage(const Poco::URI& /* uri */,
                               const std::string& /* jailRoot */,
                               const std::string& /* jailPath */,
                               std::unique_ptr<StorageBase>& /* storage */)
    {
        return false;
    }
    /// Child sent a message
    virtual bool filterChildMessage(const std::vector<char>& /* payload */)
    {
        return false;
    }

    // ---------------- TileCache hooks ----------------
    /// Called before the lookupTile call returns. Should always be called to fire events.
    virtual void lookupTile(int part, int width, int height, int tilePosX, int tilePosY,
                            int tileWidth, int tileHeight,
                            std::shared_ptr<std::vector<char>> &tile);

    // ---------------- DocumentBroker hooks ----------------
    virtual bool filterLoad(const std::string& /* sessionId */,
                            const std::string& /* jailId */,
                            bool& /* result */)
    {
        return false;
    }

    /// To force the save operation being handled as auto-save from a unit test.
    virtual bool isAutosave()
    {
        return false;
    }

    /// hook and allow through clipboard authentication
    virtual bool filterClipboardAuth(const std::string & /* serverId */, const std::string &/* tag */)
    {
        return false;
    }

    // ---------------- WSD events ----------------
    virtual void onChildConnected(const int /* pid */, const std::string& /* sessionId */) {}
    /// When admin notify message is sent
    virtual void onAdminNotifyMessage(const std::string& /* message */) {}
    /// When admin message is sent in response to a query
    virtual void onAdminQueryMessage(const std::string& /* message */) {}

    // ---------------- TileCache events ----------------
    virtual void onTileCacheHit(int /*part*/, int /*width*/, int /*height*/,
                                int /*tilePosX*/, int /*tilePosY*/,
                                int /*tileWidth*/, int /*tileHeight*/) {}
    virtual void onTileCacheMiss(int /*part*/, int /*width*/, int /*height*/,
                                 int /*tilePosX*/, int /*tilePosY*/,
                                 int /*tileWidth*/, int /*tileHeight*/) {}
    virtual void onTileCacheSubscribe(int /*part*/, int /*width*/, int /*height*/,
                                      int /*tilePosX*/, int /*tilePosY*/,
                                      int /*tileWidth*/, int /*tileHeight*/) {}
private:
    /// The actual test implementation.
    virtual void invokeWSDTest() {}
};

/// Derive your Kit unit test / hooks from me.
class UnitKit : public UnitBase
{
public:
    UnitKit();
    virtual ~UnitKit();
    static UnitKit& get()
    {
        assert(Global);
#if !MOBILEAPP && !defined(KIT_IN_PROCESS)
        assert(Global->_type == UnitType::Kit);
#endif
        return *static_cast<UnitKit *>(Global);
    }

    // ---------------- ForKit hooks ----------------

    /// main-loop reached, time for testing
    virtual void invokeForKitTest() {}

    /// Post fork hook - just after we fork to init the child kit
    virtual void launchedKit(int /* pid */) {}

    // ---------------- Kit hooks ----------------

    /// Post fork hook - just before we init the child kit
    virtual void postFork() {}

    /// Kit got a message
    virtual bool filterKitMessage(WebSocketHandler *, std::string &/* message */ )
    {
        return false;
    }

    /// LOKit (and some synthetic internal) callbacks
    virtual bool filterLoKitCallback(const int /* type */, const std::string& /* payload */)
    {
        return false;
    }

    /// Allow a custom LibreOfficeKit wrapper
    virtual LibreOfficeKit *lok_init(const char * /* instdir */,
                                     const char * /* userdir */)
    {
        return nullptr;
    }
};

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