#include "notificationstore.hpp"

#include "config/notifs.hpp"
#include "config/rootnodes.hpp"

#include <QCryptographicHash>
#include <QDateTime>
#include <QDir>
#include <QElapsedTimer>
#include <QFile>
#include <QFileInfo>
#include <QFutureWatcher>
#include <QImage>
#include <QImageReader>
#include <QJsonArray>
#include <QJsonDocument>
#include <QJsonObject>
#include <QLoggingCategory>
#include <QBuffer>
#include <QQmlEngine>
#include <QQuickImageProvider>
#include <QSqlDatabase>
#include <QSqlError>
#include <QSqlQuery>
#include <QtConcurrent/qtconcurrentrun.h>
#include <QUuid>

#include <mutex>

Q_LOGGING_CATEGORY(notifLog, "ZShell.Services.notifs", QtInfoMsg)

namespace {
constexpr int MAX_ROWS = 500;
constexpr qint64 MAX_AGE_MS = 30LL * 24 * 60 * 60 * 1000;
constexpr int TICK_MS = 250;
constexpr int MAX_IMAGE_DIM = 512;
constexpr qint64 PRUNE_INTERVAL_MS = 4LL * 60 * 60 * 1000;
constexpr qint64 TIME_STR_REFRESH_MS = 2000;
} // namespace

namespace ZShell::Services {

class NotifImageProvider : public QQuickImageProvider {
	public:
	explicit NotifImageProvider(const QString& dbPath)
		: QQuickImageProvider(QQuickImageProvider::Image), m_dbPath(dbPath) {}

	void setDbPath(const QString& dbPath) {
		std::lock_guard<std::mutex> lock(m_mutex);
		if (m_dbPath == dbPath) {
			return;
		}

		m_dbPath = dbPath;
		m_generation.fetch_add(1, std::memory_order_relaxed);
	}

	QImage requestImage(
		const QString& id, QSize* size, const QSize& requestedSize) override {
		if (id.isEmpty() || !openThreadDb(currentDbPath())) {
			return {};
		}

		QSqlQuery query(QSqlDatabase::database(m_threadUuid));
		query.prepare("SELECT png FROM images WHERE digest = ?");
		query.addBindValue(id);

		if (!query.exec() || !query.next()) {
			return {};
		}

		const QByteArray bytes = query.value(0).toByteArray();
		if (bytes.isEmpty()) {
			return {};
		}

		QImage image = QImage::fromData(bytes, "PNG");
		if (image.isNull()) {
			return {};
		}

		if (size) {
			*size = image.size();
		}

		if (requestedSize.isValid() && !requestedSize.isEmpty() &&
			(image.width() > requestedSize.width() ||
			 image.height() > requestedSize.height())) {
			image = image.scaled(
				requestedSize, Qt::KeepAspectRatio, Qt::SmoothTransformation);
		}

		return image;
	}

	private:
	QString currentDbPath() const {
		std::lock_guard<std::mutex> lock(m_mutex);
		return m_dbPath;
	}

	bool openThreadDb(const QString& dbPath) {
		const quint64 generation = m_generation.load(std::memory_order_relaxed);

		if (!m_threadUuid.isEmpty() && m_threadGeneration == generation) {
			return true;
		}

		if (!m_threadUuid.isEmpty()) {
			{
				auto db = QSqlDatabase::database(m_threadUuid, false);
				if (db.isValid()) {
					db.close();
				}
			}

			QSqlDatabase::removeDatabase(m_threadUuid);
			m_threadUuid.clear();
		}

		if (dbPath.isEmpty()) {
			return false;
		}

		const QString uuid = QUuid::createUuid().toString(QUuid::WithoutBraces);

		auto db = QSqlDatabase::addDatabase("QSQLITE", uuid);
		db.setConnectOptions("QSQLITE_OPEN_READONLY");
		db.setDatabaseName(dbPath);

		if (!db.open()) {
			return false;
		}

		m_threadUuid = uuid;
		m_threadGeneration = generation;
		return true;
	}

	mutable std::mutex m_mutex;
	QString m_dbPath;
	std::atomic<quint64> m_generation = 0;

	thread_local static QString m_threadUuid;
	thread_local static quint64 m_threadGeneration;
};

thread_local QString NotifImageProvider::m_threadUuid;
thread_local quint64 NotifImageProvider::m_threadGeneration;

NotificationActionRow::NotificationActionRow(
	QObject* action, const QString& identifier, const QString& text,
	QObject* parent)
	: QObject(parent)
	, m_action(action)
	, m_identifier(identifier)
	, m_text(text) {
	if (action) {
		QObject::connect(
			action,
			&QObject::destroyed,
			this,
			[this]() { emit invokableChanged(); });
	}
}

bool NotificationActionRow::invokable() const {
	return m_action != nullptr;
}

QString NotificationActionRow::identifier() const {
	return m_identifier;
}

QString NotificationActionRow::text() const {
	return m_text;
}

void NotificationActionRow::invoke() {
	if (auto* action = m_action.data()) {
		QMetaObject::invokeMethod(action, "invoke");
	}
}

NotificationRow::NotificationRow(QObject* parent) : QObject(parent) {}

QQmlListProperty<NotificationActionRow> NotificationRow::actions() {
	return QQmlListProperty<NotificationActionRow>(this, &m_actions);
}

QString NotificationRow::appIcon() const {
	return m_appIcon;
}

QString NotificationRow::appName() const {
	return m_appName;
}

QString NotificationRow::body() const {
	return m_body;
}

bool NotificationRow::closed() const {
	return m_closed;
}

bool NotificationRow::hasActionIcons() const {
	return m_hasActionIcons;
}

QString NotificationRow::image() const {
	return m_image;
}

QString NotificationRow::imageSource() const {
	return m_imageSource;
}

int NotificationRow::notificationId() const {
	return m_notificationId;
}

int NotificationRow::progress() const {
	return m_progress;
}

bool NotificationRow::popup() const {
	return m_popup;
}

void NotificationRow::setPopup(bool popup) {
	if (m_popup == popup) {
		return;
	}

	m_popup = popup;
	m_popupPaused = false;
	m_deadline = popup ? QDateTime::currentMSecsSinceEpoch() +
							m_store->popupTimeout()
					   : 0;
	emit popupChanged();

	if (m_store != nullptr) {
		m_store->persistPopup(this);
	}
}

bool NotificationRow::resident() const {
	return m_resident;
}

QString NotificationRow::summary() const {
	return m_summary;
}

QDateTime NotificationRow::time() const {
	return QDateTime::fromMSecsSinceEpoch(m_timeMs);
}

QString NotificationRow::timeStr() const {
	return m_timeStr;
}

int NotificationRow::urgency() const {
	return m_urgency;
}

void NotificationRow::close() {
	if (m_closed) {
		return;
	}

	m_closed = true;
	emit closedChanged();

	if (auto* notification = m_notification.data()) {
		QMetaObject::invokeMethod(notification, "dismiss");
	}

	m_store->handleClosed(this);
}

void NotificationRow::lock(QObject* item) {
	if (item == nullptr || m_locks.contains(item)) {
		return;
	}

	m_locks.insert(item);
	QObject::connect(item, &QObject::destroyed, this, [this, item]() {
		m_locks.remove(item);
	});
}

void NotificationRow::unlock(QObject* item) {
	m_locks.remove(item);

	if (m_closed && m_locks.isEmpty()) {
		m_store->removeRow(this);
	}
}

void NotificationRow::pausePopup() {
	m_popupPaused = true;
}

void NotificationRow::resumePopup() {
	m_popupPaused = false;
}

bool NotificationRow::expired(qint64 now) const {
	return m_popup && !m_popupPaused && !m_closed && m_deadline > 0 &&
		   now >= m_deadline;
}

void NotificationRow::refreshTimeStr() {
	const qint64 diff = QDateTime::currentMSecsSinceEpoch() - m_timeMs;
	const qint64 m = diff / 60000;

	QString next;
	if (m < 1) {
		next = tr("now");
	} else {
		const qint64 h = m / 60;
		const qint64 d = h / 24;

		if (d > 0) {
			next = QStringLiteral("%1d").arg(d);
		} else if (h > 0) {
			next = QStringLiteral("%1h").arg(h);
		} else {
			next = QStringLiteral("%1m").arg(m);
		}
	}

	if (next != m_timeStr) {
		m_timeStr = next;
		emit timeStrChanged();
	}
}

NotificationStore::NotificationStore(QObject* parent)
	: QObject(parent)
	, m_uuid(QUuid::createUuid().toString(QUuid::WithoutBraces)) {
	m_tick = new QTimer(this);
	m_tick->setInterval(TICK_MS);
	QObject::connect(m_tick, &QTimer::timeout, this, &NotificationStore::tick);

	// Config-backed settings, same pattern as TickingService: read the
	// config node directly and update live on its change signals. QML may
	// still write these properties; the next config change re-applies.
	auto* notifs = config::ConfigSingleton::instance()->notifs();
	applyNotifConfig(notifs);
	QObject::connect(
		notifs,
		&config::Notifs::defaultExpireTimeoutChanged,
		this,
		[this, notifs] { applyNotifConfig(notifs); });
	QObject::connect(
		notifs,
		&config::Notifs::expireChanged,
		this,
		[this, notifs] { applyNotifConfig(notifs); });
}

NotificationStore::~NotificationStore() {
	closeDb();
}

QString NotificationStore::path() const {
	return m_path;
}

void NotificationStore::setPath(const QString& path) {
	if (m_path == path || path.isEmpty()) {
		return;
	}

	m_path = path;
	emit pathChanged();

	if (!openDb()) {
		return;
	}

	migrateLegacyJson();
	prune();
	loadRows();
	qCInfo(notifLog) << "NotificationStore: ready with" << m_rows.size()
		<< "stored rows from" << m_path;

	const qint64 now = QDateTime::currentMSecsSinceEpoch();
	m_nextPrune = now + PRUNE_INTERVAL_MS;

	m_tick->start();
}

int NotificationStore::popupTimeout() const {
	return m_popupTimeout;
}

void NotificationStore::setPopupTimeout(int timeout) {
	if (m_popupTimeout == timeout || timeout <= 0) {
		return;
	}

	m_popupTimeout = timeout;
	emit popupTimeoutChanged();
}

bool NotificationStore::autoExpire() const {
	return m_autoExpire;
}

void NotificationStore::setAutoExpire(bool autoExpire) {
	if (m_autoExpire == autoExpire) {
		return;
	}

	m_autoExpire = autoExpire;
	emit autoExpireChanged();
}

void NotificationStore::applyNotifConfig(const config::Notifs* notifs) {
	setPopupTimeout(notifs->defaultExpireTimeout());
	setAutoExpire(notifs->expire());
}

QQmlListProperty<NotificationRow> NotificationStore::rows() {
	return QQmlListProperty<NotificationRow>(this, &m_rows);
}

NotificationRow* NotificationStore::insert(
	const QJSValue& notification, bool popup) {
	QElapsedTimer clock;
	clock.start();

	const auto wrapped = notification.toVariant().value<QObject*>();
	if (wrapped == nullptr) {
		qWarning(notifLog) << "NotificationStore: expected a Notification";
		return nullptr;
	}

	const int notificationId = wrapped->property("id").toInt();

	if (wrapped->property("lastGeneration").toBool()) {
		if (auto* row = rowForNotificationId(notificationId)) {
			attachNotification(row, wrapped, notification);
			return row;
		}
	}

	auto* row = new NotificationRow(this);
	row->m_store = this;
	row->m_timeMs = QDateTime::currentMSecsSinceEpoch();
	row->m_notificationId = notificationId;
	copyFields(row, wrapped);

	const auto hints = notification.property("hints");
	if (hints.isObject()) {
		row->m_progress = hints.property("value").toVariant().toInt();
	}

	attachNotification(row, wrapped, notification);

	row->m_popup = popup;
	if (popup) {
		row->m_deadline = QDateTime::currentMSecsSinceEpoch() + m_popupTimeout;
	}

	insertDbRow(row);
	const qint64 dbMs = clock.elapsed();
	startImageCache(row);
	const qint64 imageMs = clock.elapsed() - dbMs;

	m_rows.prepend(row);
	row->refreshTimeStr();
	scheduleRowsChanged();

	// rowsChanged is coalesced onto the next event loop turn, so the QML
	// reaction (filter re-evaluation + delegate rebind) runs once for a burst
	// of inserts instead of once per notification. This timing therefore
	// covers the synchronous part: attach + db + image cache start.
	if (const qint64 totalMs = clock.elapsed(); totalMs >= 3) {
		qCDebug(notifLog) << "perf: insert total" << totalMs
			<< "ms | attach+db" << dbMs << "ms | image" << imageMs << "ms";
	}

	return row;
}

void NotificationStore::scheduleRowsChanged() {
	if (m_rowsSignalPending) {
		return;
	}

	m_rowsSignalPending = true;
	QTimer::singleShot(0, this, [this] {
		if (!m_rowsSignalPending) {
			return; // an immediate emit (e.g. clear()) already covered it
		}
		m_rowsSignalPending = false;
		emit rowsChanged();
	});
}

void NotificationStore::clear() {
	const auto db = QSqlDatabase::database(m_uuid, false);
	if (db.isOpen()) {
		QSqlQuery query(db);
		query.prepare("DELETE FROM notifications");
		if (!query.exec()) {
			qWarning(notifLog)
				<< "NotificationStore: could not clear notifications"
				<< query.lastError();
		}
	}

	// The bulk delete above already removed every DB row; the per-row
	// cleanup would just re-delete no-ops, so batch it instead.
	m_clearing = true;
	const auto rows = m_rows;
	for (auto* row : rows) {
		row->close();
	}
	m_clearing = false;

	orphanCleanup();
	m_rowsSignalPending = false; // supersede any pending coalesced emit
	emit rowsChanged();
}

void NotificationStore::copyFields(
	NotificationRow* row, QObject* notification) {
	row->m_summary = notification->property("summary").toString();
	row->m_body = notification->property("body").toString();
	row->m_appName = notification->property("appName").toString();
	row->m_appIcon = notification->property("appIcon").toString();
	row->m_imageSource = notification->property("image").toString();
	row->m_image = row->m_imageSource;
	row->m_resident = notification->property("resident").toBool();
	row->m_hasActionIcons =
		notification->property("hasActionIcons").toBool();
	row->m_urgency = notification->property("urgency").toInt();
}

void NotificationStore::attachNotification(
	NotificationRow* row, QObject* notification, const QJSValue& js) {
	row->m_notification = notification;
	row->m_jsNotification = js;
	m_liveRows.insert(notification, row);

	if (!row->m_liveConnected) {
		row->m_liveConnected = true;
		const QPointer<NotificationRow> rowGuard(row);
		QObject::connect(
			notification,
			&QObject::destroyed,
			this,
			[this, rowGuard, notification]() {
				m_liveRows.remove(notification);

				if (rowGuard == nullptr || rowGuard->m_closed) {
					return;
				}

				rowGuard->m_closed = true;
				emit rowGuard->closedChanged();
				rowGuard->m_store->handleClosed(rowGuard);
			});

		// Quickshell applies replaces_id updates to the object we already
		// hold; mirror those changes onto the row (in UI and in the DB).
		// Connected straight to the slot (not through an intermediate
		// signal) so sender() in handleLiveUpdate is the Notification.
		static const QMetaMethod slot = [] {
			const QMetaObject& storeMeta =
				NotificationStore::staticMetaObject;
			return storeMeta.method(storeMeta.indexOfSlot(
				"handleLiveUpdate()"));
		}();
		static const QList<QByteArray> mirrored = {
			"summaryChanged",
			"bodyChanged",
			"appNameChanged",
			"appIconChanged",
			"imageChanged",
			"urgencyChanged",
			"residentChanged",
			"hasActionIconsChanged",
			"actionsChanged",
			"hintsChanged",
		};

		const auto* meta = notification->metaObject();
		for (int i = 0; i < meta->methodCount(); i++) {
			const auto method = meta->method(i);
			if (method.methodType() != QMetaMethod::Signal) {
				continue;
			}

			if (mirrored.contains(method.name())) {
				QObject::connect(notification, method, this, slot);
			}
		}
	}

	qDeleteAll(row->m_actions);
	row->m_actions.clear();
	row->m_actions = parseActions(js.property("actions"), row);
	emit row->actionsChanged();
}

void NotificationStore::handleLiveUpdate() {
	const auto it = m_liveRows.constFind(sender());
	if (it == m_liveRows.constEnd()) {
		qWarning(notifLog)
			<< "NotificationStore: live update for untracked notification object";
		return;
	}

	NotificationRow* row = it.value();

	const QString summary = it.key()->property("summary").toString();
	const QString body = it.key()->property("body").toString();
	const QString appName = it.key()->property("appName").toString();
	const QString appIcon = it.key()->property("appIcon").toString();
	const QString imageSource = it.key()->property("image").toString();
	const bool resident = it.key()->property("resident").toBool();
	const bool hasActionIcons =
		it.key()->property("hasActionIcons").toBool();
	const int urgency = it.key()->property("urgency").toInt();

	const bool imageChanged = imageSource != row->m_imageSource;

	if (summary != row->m_summary) {
		row->m_summary = summary;
		emit row->summaryChanged();
	}
	if (body != row->m_body) {
		row->m_body = body;
		emit row->bodyChanged();
	}
	if (appName != row->m_appName) {
		row->m_appName = appName;
		emit row->appNameChanged();
	}
	if (appIcon != row->m_appIcon) {
		row->m_appIcon = appIcon;
		emit row->appIconChanged();
	}
	if (urgency != row->m_urgency) {
		row->m_urgency = urgency;
		emit row->urgencyChanged();
	}
	if (resident != row->m_resident) {
		row->m_resident = resident;
		emit row->residentChanged();
	}
	if (hasActionIcons != row->m_hasActionIcons) {
		row->m_hasActionIcons = hasActionIcons;
		emit row->hasActionIconsChanged();
	}

	const auto hints = row->m_jsNotification.property("hints");
	if (hints.isObject()) {
		const int progress = hints.property("value").toVariant().toInt();
		if (progress != row->m_progress) {
			row->m_progress = progress;
			emit row->progressChanged();
		}
	}

	qDeleteAll(row->m_actions);
	row->m_actions.clear();
	row->m_actions = parseActions(
		row->m_jsNotification.property("actions"), row);
	emit row->actionsChanged();

	if (imageChanged) {
		row->m_imageSource = imageSource;
		row->m_digest.clear();
		row->m_image = imageSource;
		emit row->imageSourceChanged();
		emit row->imageChanged();
		startImageCache(row);
	}

	// New content deserves a full look: restart the popup countdown.
	if (row->m_popup) {
		row->m_deadline =
			QDateTime::currentMSecsSinceEpoch() + m_popupTimeout;
	}

	updateDbRow(row);
}

void NotificationStore::updateDbRow(NotificationRow* row) {
	if (row->m_rowId < 0) {
		return;
	}

	const auto db = QSqlDatabase::database(m_uuid, false);
	if (!db.isOpen()) {
		return;
	}

	QJsonArray actions;
	for (auto* action : std::as_const(row->m_actions)) {
		actions.append(QJsonObject{
			{"identifier", action->identifier()},
			{"text", action->text()}});
	}

	QSqlQuery query(db);
	query.prepare(
		"UPDATE notifications SET"
		" app_name = ?, app_icon = ?, summary = ?, body = ?,"
		" urgency = ?, resident = ?, has_action_icons = ?,"
		" actions = ?, image_source = ?, image_digest = ?"
		" WHERE id = ?");
	query.addBindValue(row->m_appName);
	query.addBindValue(row->m_appIcon);
	query.addBindValue(row->m_summary);
	query.addBindValue(row->m_body);
	query.addBindValue(row->m_urgency);
	query.addBindValue(row->m_resident ? 1 : 0);
	query.addBindValue(row->m_hasActionIcons ? 1 : 0);
	query.addBindValue(
		QString::fromUtf8(QJsonDocument(actions).toJson(QJsonDocument::Compact)));
	query.addBindValue(row->m_imageSource);
	query.addBindValue(row->m_digest);
	query.addBindValue(row->m_rowId);

	if (!query.exec()) {
		qWarning(notifLog)
			<< "NotificationStore: could not update row" << query.lastError();
	}
}

QList<NotificationActionRow*> NotificationStore::parseActions(
	const QJSValue& actions, NotificationRow* row) {
	QList<NotificationActionRow*> result;

	if (!actions.isObject()) {
		return result;
	}

	const int length = actions.property("length").toVariant().toInt();
	for (int i = 0; i < length; i++) {
		auto* object =
			actions.property(static_cast<quint32>(i)).toVariant().value<QObject*>();
		if (object == nullptr) {
			continue;
		}

		result.append(new NotificationActionRow(
			object,
			object->property("identifier").toString(),
			object->property("text").toString(),
			row));
	}

	return result;
}

NotificationRow* NotificationStore::rowForNotificationId(int id) const {
	for (auto* row : m_rows) {
		if (row->m_notificationId == id && !row->m_closed) {
			return row;
		}
	}

	return nullptr;
}

void NotificationStore::handleClosed(NotificationRow* row) {
	// During clear() the bulk DELETE already removed every row.
	if (m_clearing) {
		if (row->m_locks.isEmpty()) {
			removeRow(row);
		}

		return;
	}

	const auto db = QSqlDatabase::database(m_uuid, false);
	if (db.isOpen()) {
		QSqlQuery query(db);
		query.prepare("DELETE FROM notifications WHERE id = ?");
		query.addBindValue(row->m_rowId);
		query.exec();
	}

	if (row->m_locks.isEmpty()) {
		removeRow(row);
	}
}

void NotificationStore::removeRow(NotificationRow* row) {
	if (!m_rows.removeOne(row)) {
		return;
	}

	// The row is gone; drop any live-notification mapping to it so
	// handleLiveUpdate can never resolve a freed pointer.
	erase_if(m_liveRows, [row](std::pair<const QObject*, NotificationRow*> e) {
		return e.second == row;
	});

	row->deleteLater();

	if (!m_clearing) {
		orphanCleanup();
		scheduleRowsChanged();
	}
}

void NotificationStore::persistPopup(const NotificationRow* row) {
	if (row->m_rowId < 0) {
		return;
	}

	const auto db = QSqlDatabase::database(m_uuid, false);
	if (!db.isOpen()) {
		return;
	}

	QSqlQuery query(db);
	query.prepare("UPDATE notifications SET popup = ? WHERE id = ?");
	query.addBindValue(row->m_popup ? 1 : 0);
	query.addBindValue(row->m_rowId);

	if (!query.exec()) {
		qWarning(notifLog)
			<< "NotificationStore: could not persist popup state"
			<< query.lastError();
	}
}

void NotificationStore::insertDbRow(NotificationRow* row) {
	const auto db = QSqlDatabase::database(m_uuid, false);
	if (!db.isOpen()) {
		return;
	}

	QJsonArray actions;
	for (auto* action : std::as_const(row->m_actions)) {
		actions.append(QJsonObject{
			{"identifier", action->identifier()},
			{"text", action->text()}});
	}

	QSqlQuery query(db);
	query.prepare(
		"INSERT INTO notifications"
		" (notification_id, app_name, app_icon, summary, body, time,"
		" urgency, resident, has_action_icons, popup, actions,"
		" image_source, image_digest)"
		" VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)");
	query.addBindValue(row->m_notificationId);
	query.addBindValue(row->m_appName);
	query.addBindValue(row->m_appIcon);
	query.addBindValue(row->m_summary);
	query.addBindValue(row->m_body);
	query.addBindValue(row->m_timeMs);
	query.addBindValue(row->m_urgency);
	query.addBindValue(row->m_resident ? 1 : 0);
	query.addBindValue(row->m_hasActionIcons ? 1 : 0);
	query.addBindValue(row->m_popup ? 1 : 0);
	query.addBindValue(
		QString::fromUtf8(QJsonDocument(actions).toJson(QJsonDocument::Compact)));
	query.addBindValue(row->m_imageSource);
	query.addBindValue(row->m_digest);

	if (!query.exec()) {
		qWarning(notifLog)
			<< "NotificationStore: could not insert row" << query.lastError();
		return;
	}

	row->m_rowId = query.lastInsertId().toLongLong();
}

bool NotificationStore::openDb() {
	closeDb();

	QDir().mkpath(QFileInfo(m_path).absolutePath());

	auto db = QSqlDatabase::addDatabase("QSQLITE", m_uuid);
	db.setDatabaseName(m_path);

	if (!db.open()) {
		qWarning(notifLog) << "NotificationStore: could not open database"
						  << m_path << db.lastError();
		return false;
	}

	QSqlQuery query(db);
	const QStringList statements = {
		// WAL + NORMAL: commits don't fsync per insert (the fsync is what
		// made every notification insert 5-8ms). Safe with WAL: an
		// application crash still recovers the WAL; only an OS/power
		// failure can lose the most recent commits.
		"PRAGMA journal_mode=WAL",
		"PRAGMA synchronous=NORMAL",
		"CREATE TABLE IF NOT EXISTS notifications("
		"id INTEGER PRIMARY KEY AUTOINCREMENT,"
		" notification_id INTEGER, app_name TEXT, app_icon TEXT,"
		" summary TEXT, body TEXT, time INTEGER, urgency INTEGER,"
		" resident INTEGER, has_action_icons INTEGER, popup INTEGER,"
		" actions TEXT, image_source TEXT, image_digest TEXT)",
		"CREATE TABLE IF NOT EXISTS images("
		"digest TEXT PRIMARY KEY, png BLOB)",
		"CREATE INDEX IF NOT EXISTS notifications_time"
		" ON notifications(time DESC)",
	};

	for (const auto& statement : statements) {
		if (!query.exec(statement)) {
			qWarning(notifLog)
				<< "NotificationStore: could not prepare database schema"
				<< statement << query.lastError();
			closeDb();
			return false;
		}
	}

	if (m_provider != nullptr) {
		m_provider->setDbPath(m_path);
		return true;
	}

	registerProvider();
	return true;
}

void NotificationStore::orphanCleanup() {
	const auto db = QSqlDatabase::database(m_uuid, false);
	if (!db.isOpen()) {
		return;
	}

	QSqlQuery query(db);
	if (!query.exec(
			"DELETE FROM images WHERE digest NOT IN"
			" (SELECT DISTINCT image_digest FROM notifications"
			" WHERE image_digest != '')")) {
		qWarning(notifLog)
			<< "NotificationStore: could not clean up orphaned images"
			<< query.lastError();
	}
}

void NotificationStore::registerProvider() {
	if (m_provider != nullptr) {
		return;
	}

	auto* engine = qmlEngine(this);
	if (engine == nullptr) {
		return;
	}

	m_provider = new NotifImageProvider(m_path);
	engine->addImageProvider(QStringLiteral("notifimg"), m_provider);
}

void NotificationStore::closeDb() {
	if (!QSqlDatabase::contains(m_uuid)) {
		return;
	}

	{
		auto db = QSqlDatabase::database(m_uuid, false);
		if (db.isValid()) {
			db.close();
		}
	}

	QSqlDatabase::removeDatabase(m_uuid);
}

void NotificationStore::loadRows() {
	const auto db = QSqlDatabase::database(m_uuid, false);
	if (!db.isOpen()) {
		return;
	}

	QSqlQuery query(db);
	query.exec(
		"SELECT id, notification_id, app_name, app_icon, summary, body, time,"
		" urgency, resident, has_action_icons, popup, actions,"
		" image_source, image_digest"
		" FROM notifications ORDER BY time DESC");

	while (query.next()) {
		auto* row = new NotificationRow(this);
		row->m_store = this;
		row->m_rowId = query.value(0).toLongLong();
		row->m_notificationId = query.value(1).toInt();
		row->m_appName = query.value(2).toString();
		row->m_appIcon = query.value(3).toString();
		row->m_summary = query.value(4).toString();
		row->m_body = query.value(5).toString();
		row->m_timeMs = query.value(6).toLongLong();
		row->m_urgency = query.value(7).toInt();
		row->m_resident = query.value(8).toInt() != 0;
		row->m_hasActionIcons = query.value(9).toInt() != 0;
		row->m_popup = query.value(10).toInt() != 0;
		row->m_imageSource = query.value(12).toString();
		row->m_digest = query.value(13).toString();

		const auto actions = QJsonDocument::fromJson(
			query.value(11).toString().toUtf8());
		if (actions.isArray()) {
			for (const auto& action : actions.array()) {
				const auto object = action.toObject();
				row->m_actions.append(new NotificationActionRow(
					nullptr,
					object.value("identifier").toString(),
					object.value("text").toString(),
					row));
			}
		}

		if (row->m_popup) {
			row->m_deadline =
				QDateTime::currentMSecsSinceEpoch() + m_popupTimeout;
		}

		row->m_image = row->m_digest.isEmpty() ? row->m_imageSource
											  : QStringLiteral("image://notifimg/") +
													row->m_digest;
		row->refreshTimeStr();

		if (row->m_digest.isEmpty()) {
			startImageCache(row);
		}

		m_rows.append(row);
	}

	emit rowsChanged();
}

void NotificationStore::migrateLegacyJson() {
	const QString legacy =
		QDir(QFileInfo(m_path).absolutePath()).filePath("notifs.json");

	const auto db = QSqlDatabase::database(m_uuid, false);
	if (!db.isOpen() || !QFile::exists(legacy)) {
		return;
	}

	QSqlQuery count(db);
	count.exec("SELECT COUNT(*) FROM notifications");
	if (count.next() && count.value(0).toInt() != 0) {
		return;
	}

	QFile file(legacy);
	if (!file.open(QIODevice::ReadOnly)) {
		return;
	}

	const auto doc = QJsonDocument::fromJson(file.readAll());
	if (!doc.isArray()) {
		return;
	}

	for (const auto& value : doc.array()) {
		const auto object = value.toObject();

		auto* row = new NotificationRow(this);
		row->m_store = this;
		row->m_appName = object.value("appName").toString();
		row->m_appIcon = object.value("appIcon").toString();
		row->m_summary = object.value("summary").toString();
		row->m_body = object.value("body").toString();
		row->m_imageSource = object.value("image").toString();
		row->m_notificationId = object.value("id").toInt();
		row->m_urgency = object.value("urgency").toInt(1);
		row->m_resident = object.value("resident").toBool();
		row->m_hasActionIcons = object.value("hasActionIcons").toBool();
		row->m_popup = object.value("popup").toBool();

		const auto time = object.value("time");
		if (time.isDouble()) {
			row->m_timeMs = static_cast<qint64>(time.toDouble());
		} else {
			const auto parsed =
				QDateTime::fromString(time.toString(), Qt::ISODate);
			row->m_timeMs = parsed.isValid()
								? parsed.toMSecsSinceEpoch()
								: QDateTime::currentMSecsSinceEpoch();
		}

		for (const auto& action : object.value("actions").toArray()) {
			const auto actionObject = action.toObject();
			row->m_actions.append(new NotificationActionRow(
				nullptr,
				actionObject.value("identifier").toString(),
				actionObject.value("text").toString(),
				row));
		}

		row->m_image = row->m_imageSource;

		if (row->m_popup) {
			row->m_deadline =
				QDateTime::currentMSecsSinceEpoch() + m_popupTimeout;
		}

		row->refreshTimeStr();
		insertDbRow(row);
		startImageCache(row);
		m_rows.append(row);
	}

	if (!m_rows.isEmpty()) {
		emit rowsChanged();
	}

	file.close();
	QFile::remove(legacy + ".migrated");
	QFile::rename(legacy, legacy + ".migrated");
	qCInfo(notifLog) << "NotificationStore: migrated legacy notifs.json";
}

void NotificationStore::prune() {
	const auto db = QSqlDatabase::database(m_uuid, false);
	if (!db.isOpen()) {
		return;
	}

	QSqlQuery query(db);
	query.prepare("DELETE FROM notifications WHERE time < ?");
	query.addBindValue(QDateTime::currentMSecsSinceEpoch() - MAX_AGE_MS);
	if (!query.exec()) {
		qWarning(notifLog)
			<< "NotificationStore: could not prune old notifications"
			<< query.lastError();
	}

	if (!query.exec(
			"DELETE FROM notifications WHERE id NOT IN"
			" (SELECT id FROM notifications ORDER BY time DESC"
			" LIMIT " +
			QString::number(MAX_ROWS) + ")")) {
		qWarning(notifLog)
			<< "NotificationStore: could not trim notification rows"
			<< query.lastError();
	}

	orphanCleanup();
	trimRows();
}

void NotificationStore::trimRows() {
	if (m_rows.size() <= MAX_ROWS) {
		return;
	}

	// m_rows is newest-first. Drop closed rows from the oldest end until
	// the cap is met; open rows stay (few, and the sender may act on
	// them). Their DB rows are removed in case the DB trim above kept a
	// different set (closed rows already deleted their DB row on close,
	// so the two views can differ).
	const auto db = QSqlDatabase::database(m_uuid, false);

	for (qsizetype i = m_rows.size() - 1;
		 i >= 0 && m_rows.size() > MAX_ROWS; i--) {
		NotificationRow* row = m_rows.at(i);

		if (!row->m_closed || !row->m_locks.isEmpty()) {
			continue;
		}

		if (row->m_rowId >= 0 && db.isOpen()) {
			QSqlQuery query(db);
			query.prepare("DELETE FROM notifications WHERE id = ?");
			query.addBindValue(row->m_rowId);
			query.exec();
		}

		removeRow(row);
	}
}

void NotificationStore::startImageCache(NotificationRow* row) {
	if (row->m_imageSource.isEmpty()) {
		return;
	}

	registerProvider();

	const QUrl url(row->m_imageSource);

	// Resolve *what* to read on the main thread (engine provider lookups
	// belong here), but do no decoding here: providers are designed to
	// serve requestImage from non-GUI threads, and SVG rasterization was
	// blocking the shell 3-9ms per notification.
	QString localPath;
	QQuickImageProvider* provider = nullptr;
	QString providerId;
	bool usePixmap = false;

	if (url.isLocalFile()) {
		localPath = url.toLocalFile();
	} else if (url.scheme() == QLatin1String("image")) {
		const QString host = url.host();
		if (host != QLatin1String("qsimage") && host != QLatin1String("qspixmap")) {
			// Persistent urls (e.g. image://icon/...) resolve at any
			// shell start; caching them is pointless, and calling the
			// icon provider from this thread races KF6's KIconLoader,
			// which is not thread-safe (crashed the shell). The row
			// keeps rendering the url directly.
			return;
		}

		// Transient inline notification images (image://qsimage/...).
		// Provider objects are engine-owned and outlive this task;
		// ids owned by a destroyed notification resolve to nothing.
		auto* engine = qmlEngine(this);
		if (engine == nullptr) {
			return;
		}

		auto* base = const_cast<QQmlImageProviderBase*>(
			engine->imageProvider(url.host()));
		provider = dynamic_cast<QQuickImageProvider*>(base);
		if (provider == nullptr) {
			return;
		}

		providerId = url.path().startsWith(QLatin1Char('/'))
						 ? url.path().mid(1)
						 : url.path();

		switch (provider->imageType()) {
		case QQuickImageProvider::Image:
			usePixmap = false;
			break;
		case QQuickImageProvider::Pixmap:
			usePixmap = true;
			break;
		default:
			return;
		}
	}

	const QPointer<NotificationRow> guard(row);

	auto* watcher = new QFutureWatcher<std::pair<QString, QByteArray>>(this);
	QObject::connect(
		watcher,
		&QFutureWatcher<std::pair<QString, QByteArray>>::finished,
		this,
		[this, watcher, guard]() {
			const auto result = watcher->result();
			if (!result.first.isEmpty()) {
				storeImageBlob(guard, result.first, result.second);
			}

			watcher->deleteLater();
		});

	watcher->setFuture(QtConcurrent::run(
		[localPath, provider, providerId, usePixmap]() {
			QImage image;

			if (!localPath.isEmpty()) {
				QImageReader reader(localPath);
				reader.setAutoTransform(true);
				image = reader.read();
			} else if (provider != nullptr) {
				image = usePixmap
							? provider->requestPixmap(providerId, nullptr, QSize())
								  .toImage()
							: provider->requestImage(providerId, nullptr, QSize());
			}

			if (image.isNull()) {
				return std::pair<QString, QByteArray>();
			}

			QImage normalized = image;
			if (normalized.width() > MAX_IMAGE_DIM ||
				normalized.height() > MAX_IMAGE_DIM) {
				normalized = normalized.scaled(
					MAX_IMAGE_DIM, MAX_IMAGE_DIM, Qt::KeepAspectRatio,
					Qt::SmoothTransformation);
			}

			normalized = normalized.convertToFormat(QImage::Format_RGBA8888);

			const QByteArray bytes(
				reinterpret_cast<const char*>(normalized.constBits()),
				normalized.sizeInBytes());

			const QString digest = QString::fromLatin1(
				QCryptographicHash::hash(bytes, QCryptographicHash::Sha256)
					.toHex());

			QByteArray png;
			QBuffer buffer(&png);
			if (!buffer.open(QIODevice::WriteOnly) ||
				!normalized.save(&buffer, "PNG")) {
				return std::pair<QString, QByteArray>();
			}

			return std::make_pair(digest, png);
		}));
}

void NotificationStore::storeImageBlob(
	const QPointer<NotificationRow>& row,
	const QString& digest,
	const QByteArray& png) {
	const auto db = QSqlDatabase::database(m_uuid, false);
	if (!db.isOpen()) {
		return;
	}

	QSqlQuery query(db);
	query.prepare(
		"INSERT INTO images (digest, png) VALUES (?, ?)"
		" ON CONFLICT(digest) DO NOTHING");
	query.addBindValue(digest);
	query.addBindValue(png);
	query.exec();

	if (row != nullptr) {
		if (row->m_rowId >= 0) {
			QSqlQuery update(db);
			update.prepare("UPDATE notifications SET image_digest = ?"
						   " WHERE id = ?");
			update.addBindValue(digest);
			update.addBindValue(row->m_rowId);
			update.exec();
		}

		row->m_digest = digest;
		row->m_image =
			QStringLiteral("image://notifimg/") + digest;
		emit row->imageChanged();
	}
}

void NotificationStore::tick() {
	const qint64 now = QDateTime::currentMSecsSinceEpoch();

	for (auto* row : std::as_const(m_rows)) {
		if (m_autoExpire && row->expired(now)) {
			row->setPopup(false);
		}
	}

	if (m_nextTimeStrRefresh <= now) {
		m_nextTimeStrRefresh = now + TIME_STR_REFRESH_MS;

		for (auto* row : std::as_const(m_rows)) {
			row->refreshTimeStr();
		}
	}

	if (m_nextPrune <= now) {
		m_nextPrune = now + PRUNE_INTERVAL_MS;
		prune();
		trimRows();
	}
}

} // namespace ZShell::Services