/*
  ==============================================================================

   This file is part of the JUCE 6 technical preview.
   Copyright (c) 2020 - Raw Material Software Limited

   You may use this code under the terms of the GPL v3
   (see www.gnu.org/licenses).

   For this technical preview, this file is not subject to commercial licensing.

   JUCE IS PROVIDED "AS IS" WITHOUT ANY WARRANTY, AND ALL WARRANTIES, WHETHER
   EXPRESSED OR IMPLIED, INCLUDING MERCHANTABILITY AND FITNESS FOR PURPOSE, ARE
   DISCLAIMED.

  ==============================================================================
*/
#include "../Application/jucer_Headers.h"
#include "../Application/jucer_Application.h"
#include "../ProjectSaving/jucer_ProjectExporter.h"
#include "../Project/UI/jucer_HeaderComponent.h"
#include "jucer_LicenseController.h"

#if ! JUCER_ENABLE_GPL_MODE
 #include "jucer_LicenseWebview.h"
 #include "jucer_LicenseThread.h"
#endif

//==============================================================================
const char* LicenseState::licenseTypeToString (LicenseState::Type type)
{
    switch (type)
    {
        case Type::notLoggedIn:         return "<notLoggedIn>";
        case Type::noLicenseChosenYet:  return "<noLicenseChosenYet>";
        case Type::GPL:                 return "JUCE GPL";
        case Type::personal:            return "JUCE Personal";
        case Type::edu:                 return "JUCE Education";
        case Type::indie:               return "JUCE Indie";
        case Type::pro:                 return "JUCE Pro";
        default:                        return "<unknown>";
    }
}

static const char* getLicenseStateValue (LicenseState::Type type)
{
    switch (type)
    {
        case LicenseState::Type::GPL:       return "GPL";
        case LicenseState::Type::personal:  return "personal";
        case LicenseState::Type::edu:       return "edu";
        case LicenseState::Type::indie:     return "indie";
        case LicenseState::Type::pro:       return "pro";
        case LicenseState::Type::notLoggedIn:
        case LicenseState::Type::noLicenseChosenYet:
        default:                            return nullptr;
    }
}

static LicenseState::Type getLicenseTypeFromValue (const String& d)
{
    if (d == getLicenseStateValue (LicenseState::Type::GPL))       return LicenseState::Type::GPL;
    if (d == getLicenseStateValue (LicenseState::Type::personal))  return LicenseState::Type::personal;
    if (d == getLicenseStateValue (LicenseState::Type::edu))       return LicenseState::Type::edu;
    if (d == getLicenseStateValue (LicenseState::Type::indie))     return LicenseState::Type::indie;
    if (d == getLicenseStateValue (LicenseState::Type::pro))       return LicenseState::Type::pro;
    return LicenseState::Type::noLicenseChosenYet;
}

#if ! JUCER_ENABLE_GPL_MODE
struct LicenseController::ModalCompletionCallback : ModalComponentManager::Callback
{
    ModalCompletionCallback (LicenseController& controller) : owner (controller) {}
    void modalStateFinished (int returnValue) override       { owner.modalStateFinished (returnValue); }
    LicenseController& owner;

    JUCE_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR (ModalCompletionCallback)
};
#endif

//==============================================================================
LicenseController::LicenseController()
    : state (licenseStateFromSettings (ProjucerApplication::getApp().settings->getGlobalProperties()))
{
   #if JUCER_ENABLE_GPL_MODE
    state.type     = LicenseState::Type::GPL;
    state.username = "GPL mode";
   #endif
}

LicenseController::~LicenseController()
{
   #if ! JUCER_ENABLE_GPL_MODE
    thread.reset();
    closeWebview (-1);
   #endif
}

LicenseState LicenseController::getState() const noexcept
{
    LicenseState projucerState = state;

    // if the user has never logged in before and the user is running from command line
    // then we have no way to ask the user to log in, so fallback to GPL mode
    if (guiNotInitialisedYet
        && (state.type == LicenseState::Type::notLoggedIn
         || state.type == LicenseState::Type::noLicenseChosenYet))
    {
        projucerState.type = LicenseState::Type::GPL;
        projucerState.username = "GPL mode";
    }

    return projucerState;
}

void LicenseController::startWebviewIfNeeded()
{
    if (guiNotInitialisedYet)
    {
        guiNotInitialisedYet = false;
        auto stateParam = getState();
        listeners.call ([&] (StateChangedCallback& l) { l.licenseStateChanged (stateParam); });
    }

   #if ! JUCER_ENABLE_GPL_MODE
    if (thread == nullptr)
        thread.reset (new LicenseThread (*this, false));
   #endif
}

void LicenseController::logout()
{
    JUCE_ASSERT_MESSAGE_MANAGER_IS_LOCKED

   #if ! JUCER_ENABLE_GPL_MODE
    thread.reset();
    updateState ({});

   #if ! JUCE_LINUX
    WebBrowserComponent::clearCookies();
   #endif

    thread.reset (new LicenseThread (*this, false));
   #endif
}

void LicenseController::chooseNewLicense()
{
    JUCE_ASSERT_MESSAGE_MANAGER_IS_LOCKED

   #if ! JUCER_ENABLE_GPL_MODE
    thread.reset();
    thread.reset (new LicenseThread (*this, true));
   #endif
}

//==============================================================================
#if ! JUCER_ENABLE_GPL_MODE
void LicenseController::closeWebview (int result)
{
    if (licenseWebview != nullptr)
        licenseWebview->exitModalState (result);
}

void LicenseController::modalStateFinished (int result)
{
    licenseWebview = nullptr;

    if (result == -1 && (state.type == LicenseState::Type::notLoggedIn
                          || state.type == LicenseState::Type::noLicenseChosenYet))
        JUCEApplication::getInstance()->systemRequestedQuit();
}

void LicenseController::ensureLicenseWebviewIsOpenWithPage (const String& param)
{
    if (licenseWebview != nullptr)
    {
        licenseWebview->goToURL (param);
        licenseWebview->toFront (true);
    }
    else
    {
       #if ! JUCE_LINUX
        WebBrowserComponent::clearCookies();
       #endif

        licenseWebview = new LicenseWebview (new ModalCompletionCallback (*this), param);
    }
}

void LicenseController::queryWebview (const String& startURL, const String& valueToQuery,
                                      HashMap<String, String>& result)
{
    ensureLicenseWebviewIsOpenWithPage (startURL);

    licenseWebview->setPageCallback ([this,valueToQuery,&result] (const String& cmd, const HashMap<String, String>& params)
    {
        if (valueToQuery.isEmpty() || cmd == valueToQuery)
        {
            result.clear();

            for (HashMap<String, String>::Iterator it = params.begin(); it != params.end(); ++it)
                result.set (it.getKey(), it.getValue());

            if (thread != nullptr && ! thread->threadShouldExit())
                thread->finished.signal();
        }
    });

    licenseWebview->setNewWindowCallback ([this, &result] (const String& url)
    {
        if (url.endsWith ("get-juce/indie") || url.endsWith ("get-juce/pro"))
        {
            result.clear();
            result.set ("page-redirect", url);

            if (thread != nullptr && ! thread->threadShouldExit())
                thread->finished.signal();
        }
    });
}
#endif

void LicenseController::updateState (const LicenseState& newState)
{
    auto& props = ProjucerApplication::getApp().settings->getGlobalProperties();

    state = newState;
    licenseStateToSettings (state, props);
    auto stateParam = getState();
    listeners.call ([&] (StateChangedCallback& l) { l.licenseStateChanged (stateParam); });
}

LicenseState LicenseController::licenseStateFromOldSettings (XmlElement* licenseXml)
{
    LicenseState result;
    result.type                        = getLicenseTypeFromValue    (licenseXml->getChildElementAllSubText ("type", {}));
    result.username                    = licenseXml->getChildElementAllSubText ("username", {});
    result.email                       = licenseXml->getChildElementAllSubText ("email", {});
    result.authToken                   = licenseXml->getChildElementAllSubText ("authToken", {});

    MemoryOutputStream imageData;
    Base64::convertFromBase64 (imageData, licenseXml->getChildElementAllSubText ("avatar", {}));
    result.avatar = ImageFileFormat::loadFrom (imageData.getData(), imageData.getDataSize());

    return result;
}

LicenseState LicenseController::licenseStateFromSettings (PropertiesFile& props)
{
    if (auto licenseXml = props.getXmlValue ("license"))
    {
        // this is here for backwards compatibility with old-style settings files using XML text elements
        if (licenseXml->getChildElementAllSubText ("type", {}) != String())
        {
            auto stateFromOldSettings = licenseStateFromOldSettings (licenseXml.get());

            licenseStateToSettings (stateFromOldSettings, props);

            return stateFromOldSettings;
        }

        LicenseState result;
        result.type                        = getLicenseTypeFromValue    (licenseXml->getStringAttribute ("type", {}));
        result.username                    = licenseXml->getStringAttribute ("username", {});
        result.email                       = licenseXml->getStringAttribute ("email", {});
        result.authToken                   = licenseXml->getStringAttribute ("authToken", {});

        MemoryOutputStream imageData;
        Base64::convertFromBase64 (imageData, licenseXml->getStringAttribute ("avatar", {}));
        result.avatar = ImageFileFormat::loadFrom (imageData.getData(), imageData.getDataSize());

        return result;
    }

    return {};
}

void LicenseController::licenseStateToSettings (const LicenseState& state, PropertiesFile& props)
{
    props.removeValue ("license");

    if (state.type != LicenseState::Type::notLoggedIn && state.username.isNotEmpty())
    {
        XmlElement licenseXml ("license");

        if (auto* typeString = getLicenseStateValue (state.type))
            licenseXml.setAttribute ("type", typeString);

        licenseXml.setAttribute ("username", state.username);
        licenseXml.setAttribute ("email", state.email);
        licenseXml.setAttribute ("authToken", state.authToken);

        MemoryOutputStream imageData;
        if (state.avatar.isValid() && PNGImageFormat().writeImageToStream (state.avatar, imageData))
            licenseXml.setAttribute ("avatar", Base64::toBase64 (imageData.getData(), imageData.getDataSize()));

        props.setValue ("license", &licenseXml);
    }

    props.saveIfNeeded();
}