// SPDX-FileCopyrightText: 2024 Joshua Goins <josh@redstrate.com>
// SPDX-License-Identifier: GPL-3.0-or-later

#include "syncmanager.h"
#include "astra_log.h"

#include <Quotient/accountregistry.h>
#include <Quotient/csapi/content-repo.h>
#include <Quotient/csapi/room_state.h>
#include <Quotient/events/stateevent.h>
#include <Quotient/jobs/downloadfilejob.h>
#include <Quotient/room.h>
#include <Quotient/settings.h>

#include <KConfigGroup>
#include <KLocalizedString>
#include <KSharedConfig>
#include <QCoreApplication>
#include <QCoro>

const auto roomType = QStringLiteral("zone.xiv.astra-sync");
const auto syncEventType = QStringLiteral("zone.xiv.astra.sync");
const auto lockEventType = QStringLiteral("zone.xiv.astra.lock");

const auto hostnameKey = QStringLiteral("hostname");
const auto latestKey = QStringLiteral("latest");
const auto noneKey = QStringLiteral("none");
const auto filesKey = QStringLiteral("files");
const auto contentUriKey = QStringLiteral("content-uri");

using namespace Quotient;

SyncManager::SyncManager(QObject *parent)
    : QObject(parent)
{
    m_accountRegistry.invokeLogin(); // TODO: port from invokeLogin
    connect(&m_accountRegistry, &AccountRegistry::rowsInserted, this, [this]() {
        connection()->setCacheState(false);
        connection()->setLazyLoading(false);
        Connection::setDirectChatEncryptionDefault(false);
        Connection::setEncryptionDefault(false);

        Q_EMIT connectedChanged();
        Q_EMIT userIdChanged();
        Q_EMIT connectionChanged();

        beginInitialSync();
    });
    connect(&m_accountRegistry, &AccountRegistry::rowsRemoved, this, [this]() {
        Q_EMIT connectedChanged();
        Q_EMIT userIdChanged();
        Q_EMIT connectionChanged();
    });
}

void SyncManager::login(const QString &matrixId, const QString &password)
{
    auto connection = new Connection(this);
    connection->resolveServer(matrixId);
    connect(
        connection,
        &Connection::loginFlowsChanged,
        this,
        [connection, matrixId, password]() {
            connection->loginWithPassword(matrixId, password, qAppName(), {});
        },
        Qt::SingleShotConnection);

    connect(connection, &Connection::connected, this, [this, connection] {
        qCDebug(ASTRA_LOG) << "Connected to the sync server!";

        // TODO: store somewhere else, not their QSettings
        AccountSettings account(connection->userId());
        account.setKeepLoggedIn(true);
        account.setHomeserver(connection->homeserver());
        account.setDeviceId(connection->deviceId());
        account.setDeviceName(qAppName());
        account.sync();

        m_accountRegistry.add(connection);
    });

    connect(connection, &Connection::loginError, this, &SyncManager::loginError);
    connect(connection, &Connection::resolveError, this, &SyncManager::loginError);
}

bool SyncManager::connected() const
{
    return !m_accountRegistry.empty();
}

QString SyncManager::userId() const
{
    return !m_accountRegistry.empty() ? m_accountRegistry.accounts().first()->userId() : QString();
}

void SyncManager::logout()
{
    m_accountRegistry.accounts().first()->logout();
}

Quotient::Connection *SyncManager::connection() const
{
    if (!m_accountRegistry.empty()) {
        return m_accountRegistry.accounts().first();
    }
    return nullptr;
}

QCoro::Task<> SyncManager::sync()
{
    // We don't need two syncs running at once.
    if (connection()->syncJob()) {
        co_return;
    }

    auto connection = m_accountRegistry.accounts().first();
    connection->sync();
    co_await qCoro(connection, &Connection::syncDone);
    m_accountRegistry.accounts().first()->stopSync();
    co_return;
}

QCoro::Task<void> SyncManager::findRoom()
{
    qCDebug(ASTRA_LOG) << "Time to find the sync room!";

    const QString roomId = this->roomId();

    qCDebug(ASTRA_LOG) << "Stored room id:" << roomId;

    // If we have no room id set, we need to find the correct room type
    const bool needsFirstTimeRoom = roomId.isEmpty();

    // Try to find our room
    auto rooms = m_accountRegistry.accounts().first()->rooms(Quotient::JoinState::Join);
    for (auto room : rooms) {
        if (!room->currentState().contains<RoomCreateEvent>()) {
            co_await qCoro(room, &Room::baseStateLoaded);
            qCDebug(ASTRA_LOG) << "Loaded base state...";
        }

        if (needsFirstTimeRoom) {
            const QJsonObject createEvent = room->currentState().eventsOfType(QStringLiteral("m.room.create")).first()->fullJson();
            auto contentJson = createEvent[QStringLiteral("content")].toObject();
            if (contentJson.contains(QStringLiteral("type"))) {
                if (contentJson[QStringLiteral("type")] == roomType) {
                    qCDebug(ASTRA_LOG) << room << "matches!";
                    m_currentRoom = room;
                    setRoomId(room->id());
                    Q_EMIT isReadyChanged();
                }
            }
        } else {
            if (room->id() == roomId) {
                qCDebug(ASTRA_LOG) << "Found pre-existing room!";

                m_currentRoom = room;
                Q_EMIT isReadyChanged();

                co_return;
            }
        }
    }

    // We failed to find a room, and we need to create one
    if (needsFirstTimeRoom && !m_currentRoom) {
        qCDebug(ASTRA_LOG) << "Need to create room!";

        auto job = connection()->createRoom(Quotient::Connection::RoomVisibility::UnpublishRoom,
                                            QString{},
                                            i18n("Astra Sync"),
                                            i18n("Room used to sync Astra between devices"),
                                            QStringList{},
                                            QString{},
                                            QString::number(10),
                                            false,
                                            {},
                                            {},
                                            QJsonObject{{QStringLiteral("type"), roomType}});
        co_await qCoro(job.get(), &BaseJob::finished);

        setRoomId(job->roomId());
        qCDebug(ASTRA_LOG) << "Created sync room at" << job->roomId();

        // re-run sync to get the new room
        sync();
    }

    co_return;
}

QString SyncManager::roomId() const
{
    return KSharedConfig::openStateConfig()->group(QStringLiteral("Sync")).readEntry(QStringLiteral("RoomId"));
}

void SyncManager::setRoomId(const QString &roomId)
{
    auto stateConfig = KSharedConfig::openStateConfig();
    stateConfig->group(QStringLiteral("Sync")).writeEntry(QStringLiteral("RoomId"), roomId);
    stateConfig->sync();
}

bool SyncManager::isReady() const
{
    return connected() && m_currentRoom;
}

QCoro::Task<std::optional<SyncManager::PreviousCharacterData>> SyncManager::getUploadedCharacterData(const QString &id)
{
    Q_ASSERT(m_currentRoom);

    const auto syncEvent = m_currentRoom->currentState().contentJson(syncEventType, id);
    if (syncEvent.isEmpty()) {
        qCDebug(ASTRA_LOG) << "No previous sync for" << id;
        co_return std::nullopt;
    } else {
        qCDebug(ASTRA_LOG) << "previous sync event:" << syncEvent;

        auto filesVariantMap = syncEvent[filesKey].toVariant().toMap();
        QMap<QString, QString> fileHashes;
        for (const auto &[file, hashVariant] : filesVariantMap.asKeyValueRange()) {
            fileHashes[file] = hashVariant.toString();
        }

        co_return PreviousCharacterData{.mxcUri = syncEvent[contentUriKey].toString(), .hostname = syncEvent[hostnameKey].toString(), .fileHashes = fileHashes};
    }
}

QCoro::Task<bool> SyncManager::uploadCharacterArchive(const QString &id, const QString &path, const QMap<QString, QString> &fileHashes)
{
    Q_ASSERT(m_currentRoom);

    auto uploadFileJob = connection()->uploadFile(path);
    co_await qCoro(uploadFileJob.get(), &BaseJob::finished);

    // TODO: error handling

    const QUrl contentUri = uploadFileJob->contentUri();

    QVariantMap fileHashesVariant;
    for (const auto &[file, hash] : fileHashes.asKeyValueRange()) {
        fileHashesVariant[file] = QVariant::fromValue(hash);
    }

    auto syncSetState = m_currentRoom->setState(
        syncEventType,
        id,
        QJsonObject{
            {{contentUriKey, contentUri.toString()}, {hostnameKey, QSysInfo::machineHostName()}, {filesKey, QJsonObject::fromVariantMap(fileHashesVariant)}}});
    co_await qCoro(syncSetState, &BaseJob::finished);

    co_return true;
}

QCoro::Task<bool> SyncManager::downloadCharacterArchive(const QString &mxcUri, const QString &destPath)
{
    auto job = connection()->downloadFile(QUrl::fromUserInput(mxcUri), destPath);
    co_await qCoro(job, &BaseJob::finished);

    // TODO: error handling

    co_return true;
}

QCoro::Task<std::optional<QString>> SyncManager::checkLock()
{
    const auto lockEvent = m_currentRoom->currentState().contentJson(syncEventType, latestKey);
    if (lockEvent.isEmpty()) {
        co_return std::nullopt;
    }

    qCDebug(ASTRA_LOG) << "previous lock event:" << lockEvent;
    const QString hostname = lockEvent[hostnameKey].toString();
    if (hostname == noneKey) {
        co_return std::nullopt;
    }

    co_return hostname;
}

QCoro::Task<> SyncManager::setLock()
{
    auto lockSetState = m_currentRoom->setState(syncEventType, latestKey, QJsonObject{{hostnameKey, QSysInfo::machineHostName()}});
    co_await qCoro(lockSetState, &BaseJob::finished);
    co_return;
}

QCoro::Task<> SyncManager::breakLock()
{
    auto lockSetState = m_currentRoom->setState(syncEventType, latestKey, QJsonObject{{hostnameKey, noneKey}});
    co_await qCoro(lockSetState, &BaseJob::finished);
    co_return;
}

QCoro::Task<> SyncManager::beginInitialSync()
{
    co_await sync();

    // Find the room we need to sync with
    findRoom();
}

#include "moc_syncmanager.cpp"