/////////////////////////////////////////////////////////////////////////////////
//
//  Copyright (C) 2024- Equinor ASA
//
//  ResInsight is free software: you can redistribute it and/or modify
//  it under the terms of the GNU General Public License as published by
//  the Free Software Foundation, either version 3 of the License, or
//  (at your option) any later version.
//
//  ResInsight is distributed in the hope that it will be useful, but WITHOUT ANY
//  WARRANTY; without even the implied warranty of MERCHANTABILITY or
//  FITNESS FOR A PARTICULAR PURPOSE.
//
//  See the GNU General Public License at <http://www.gnu.org/licenses/gpl.html>
//  for more details.
//
/////////////////////////////////////////////////////////////////////////////////

#include "RiaConnectorTools.h"

#include "RiaApplication.h"
#include "RiaLogging.h"
#include "RiaOpenTelemetryManager.h"
#include "RiaPreferences.h"
#include "RiaPreferencesOpenTelemetry.h"
#include "RiaPreferencesOsdu.h"
#include "RiaPreferencesSumo.h"

#include <QDir>
#include <QFile>
#include <QFileInfo>
#include <QJsonDocument>
#include <QJsonObject>
#include <QTextStream>
#include <QtNetworkAuth/QOAuth2AuthorizationCodeFlow>

#include <QCoreApplication>

//--------------------------------------------------------------------------------------------------
///
//--------------------------------------------------------------------------------------------------
QString RiaConnectorTools::tokenDataAsJson( QOAuth2AuthorizationCodeFlow* authCodeFlow )
{
    QJsonObject obj;
    obj.insert( "token", authCodeFlow->token() );
    obj.insert( "refreshToken", authCodeFlow->refreshToken() );
    if ( authCodeFlow->expirationAt().isValid() )
    {
        obj.insert( "expiration", authCodeFlow->expirationAt().toSecsSinceEpoch() );
    }

    QJsonDocument doc( obj );
    return doc.toJson( QJsonDocument::Indented );
}

//--------------------------------------------------------------------------------------------------
///
//--------------------------------------------------------------------------------------------------
void RiaConnectorTools::initializeTokenDataFromJson( QOAuth2AuthorizationCodeFlow* authCodeFlow, const QString& tokenDataJson )
{
    QJsonDocument doc = QJsonDocument::fromJson( tokenDataJson.toUtf8() );
    QJsonObject   obj = doc.object();

    if ( obj.contains( "expiration" ) && obj.contains( "token" ) )
    {
        quint64   secondsSinceEpoch = obj["expiration"].toVariant().toULongLong();
        QDateTime expiration        = QDateTime::fromSecsSinceEpoch( secondsSinceEpoch );
        if ( expiration.isValid() && expiration > QDateTime::currentDateTime() )
        {
            authCodeFlow->setToken( obj["token"].toString() );
        }
    }

    authCodeFlow->setRefreshToken( obj["refreshToken"].toString() );
}

//--------------------------------------------------------------------------------------------------
///
//--------------------------------------------------------------------------------------------------
void RiaConnectorTools::writeTokenData( const QString& filePath, const QString& tokenDataJson )
{
    QFile file( filePath );

    // Ensure the directory exists (create it if it doesn't)
    QString dirPath = QFileInfo( file ).absolutePath();
    QDir    dir( dirPath );
    if ( !dir.exists() )
    {
        dir.mkpath( dirPath );
    }

    if ( file.open( QIODevice::WriteOnly ) )
    {
        QTextStream stream( &file );
        stream << tokenDataJson;
        file.close();
    }
}

//--------------------------------------------------------------------------------------------------
///
//--------------------------------------------------------------------------------------------------
QString RiaConnectorTools::readStringFromFile( const QString& filePath )
{
    QFile file( filePath );
    if ( file.open( QIODevice::ReadOnly ) )
    {
        QTextStream stream( &file );
        QString     result = stream.readAll();
        file.close();
        return result;
    }
    return {};
}

//--------------------------------------------------------------------------------------------------
///
//--------------------------------------------------------------------------------------------------
std::map<QString, QString> RiaConnectorTools::readKeyValuePairs( const QString& filePath )
{
    auto content = readStringFromFile( filePath );

    QJsonDocument doc = QJsonDocument::fromJson( content.toUtf8() );
    QJsonObject   obj = doc.object();

    std::map<QString, QString> keyValuePairs;
    for ( auto it = obj.begin(); it != obj.end(); ++it )
    {
        QJsonValue value = it.value();
        QString    valueStr;

        if ( value.isString() )
        {
            valueStr = value.toString();
        }
        else if ( value.isDouble() )
        {
            valueStr = QString::number( value.toDouble() );
        }
        else if ( value.isBool() )
        {
            valueStr = value.toBool() ? "true" : "false";
        }

        keyValuePairs[it.key()] = valueStr;
    }

    return keyValuePairs;
}

//--------------------------------------------------------------------------------------------------
///
//--------------------------------------------------------------------------------------------------
void RiaConnectorTools::readCloudConfigFiles( RiaPreferences* preferences )
{
    if ( preferences == nullptr ) return;

    // Check multiple locations for configuration files. The first valid configuration file is used. Currently, using Qt5 the ResInsight
    // binary file is stored at the root of the installation folder. When moving to Qt6, we will probably use sub folders /bin /lib and
    // others. Support both one and two search levels to support Qt6.
    //
    // home_folder/.resinsight/*_config.json
    // location_of_resinsight_executable/../share/cloud_services/*_config.json
    // location_of_resinsight_executable/../../share/cloud_services/*_config.json
    //

    auto buildConfigFilePathCandidates = []( const QString& fileName ) -> QStringList
    {
        QStringList candidates;
        candidates << QDir::homePath() + "/.resinsight/" + fileName;
        candidates << QCoreApplication::applicationDirPath() + "/../share/cloud_services/" + fileName;
        candidates << QCoreApplication::applicationDirPath() + "/../../share/cloud_services/" + fileName;
        return candidates;
    };

    // Load OSDU configuration
    for ( const auto& filePath : buildConfigFilePathCandidates( "osdu_config.json" ) )
    {
        auto keyValuePairs = RiaConnectorTools::readKeyValuePairs( filePath );
        if ( !keyValuePairs.empty() )
        {
            RiaLogging::debug( QString( "Imported OSDU configuration from : '%1'" ).arg( filePath ) );
            preferences->osduPreferences()->setData( keyValuePairs );
            preferences->osduPreferences()->setFieldsReadOnly();
            break;
        }
    }

    // Load SUMO configuration
    for ( const auto& filePath : buildConfigFilePathCandidates( "sumo_config.json" ) )
    {
        auto keyValuePairs = RiaConnectorTools::readKeyValuePairs( filePath );
        if ( !keyValuePairs.empty() )
        {
            RiaLogging::debug( QString( "Imported SUMO configuration from : '%1'" ).arg( filePath ) );
            preferences->sumoPreferences()->setData( keyValuePairs );
            preferences->sumoPreferences()->setFieldsReadOnly();
            break;
        }
    }

    // Load OpenTelemetry configuration
    for ( const auto& filePath : buildConfigFilePathCandidates( "opentelemetry_config.json" ) )
    {
        auto keyValuePairs = RiaConnectorTools::readKeyValuePairs( filePath );
        if ( !keyValuePairs.empty() )
        {
            RiaLogging::debug( QString( "Imported OpenTelemetry configuration from : '%1'" ).arg( filePath ) );
            RiaPreferencesOpenTelemetry::current()->setData( keyValuePairs );
            RiaPreferencesOpenTelemetry::current()->setFieldsReadOnly();
            break;
        }
    }
}

//--------------------------------------------------------------------------------------------------
///
//--------------------------------------------------------------------------------------------------
void RiaConnectorTools::configureCloudServices()
{
    if ( auto preferences = RiaApplication::instance()->preferences() )
    {
        RiaConnectorTools::readCloudConfigFiles( preferences );

        if ( preferences->openTelemetryPreferences()->loggingState() != RiaPreferencesOpenTelemetry::LoggingState::DISABLED )
        {
            // Initialize OpenTelemetry after configuration is loaded
            auto& otelManager = RiaOpenTelemetryManager::instance();
            if ( otelManager.initialize() )
            {
                // Set system username for telemetry tracking
                QString username = RiaOpenTelemetryManager::getSystemUsername();
                if ( !username.isEmpty() )
                {
                    otelManager.setUsername( username.toStdString() );
                }
                RiaLogging::debug( "OpenTelemetry initialized successfully" );
            }
            else
            {
                RiaLogging::debug( "OpenTelemetry initialization failed or not configured" );
            }
        }
    }
}