#include <obs/obs-frontend-api.h>
#include <obs/obs-interaction.h>
#include <obs/obs-module.h>

#include <QAbstractItemView>
#include <QAction>
#include <QApplication>
#include <QByteArray>
#include <QContextMenuEvent>
#include <QDialog>
#include <QDialogButtonBox>
#include <QDockWidget>
#include <QFocusEvent>
#include <QHash>
#include <QHeaderView>
#include <QImage>
#include <QKeyEvent>
#include <QLabel>
#include <QMainWindow>
#include <QMenu>
#include <QMenuBar>
#include <QMessageBox>
#include <QMouseEvent>
#include <QPainter>
#include <QPointer>
#include <QPushButton>
#include <QResizeEvent>
#include <QSet>
#include <QShowEvent>
#include <QSocketNotifier>
#include <QTableWidget>
#include <QTimer>
#include <QUuid>
#include <QVBoxLayout>
#include <QVector>
#include <QWheelEvent>
#include <QWidget>

#include <algorithm>
#include <cerrno>
#include <csignal>
#include <cstdint>
#include <cstring>
#include <fcntl.h>
#include <spawn.h>
#include <sys/mman.h>
#include <sys/socket.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <unistd.h>
#include <utility>

#include "protocol.h"

extern "C" {
extern char **environ;
const char *owb_module_text(const char *key);
}

namespace {

constexpr const char *kSaveKey = "obs-webkit-browser-docks";
constexpr const char *kDockPrefix = "obs-webkit-browser-dock-";

QString text(const char *key)
{
	return QString::fromUtf8(owb_module_text(key));
}

bool writeAll(int fd, const void *data, size_t size)
{
	auto cursor = static_cast<const uint8_t *>(data);
	while (size > 0) {
		ssize_t written = send(fd, cursor, size, MSG_NOSIGNAL);
		if (written < 0 && errno == EINTR)
			continue;
		if (written <= 0)
			return false;
		cursor += written;
		size -= static_cast<size_t>(written);
	}
	return true;
}

void closeFd(int &fd)
{
	if (fd >= 0)
		close(fd);
	fd = -1;
}

void closeOnExec(int fd)
{
	int flags = fcntl(fd, F_GETFD);
	if (flags >= 0)
		fcntl(fd, F_SETFD, flags | FD_CLOEXEC);
}

void nonBlocking(int fd)
{
	int flags = fcntl(fd, F_GETFL);
	if (flags >= 0)
		fcntl(fd, F_SETFL, flags | O_NONBLOCK);
}

struct DockDefinition {
	QString id;
	QString title;
	QString url;
};

class WebPanel final : public QWidget {
public:
	explicit WebPanel(QString url, QWidget *parent = nullptr) : QWidget(parent), url_(std::move(url))
	{
		setFocusPolicy(Qt::StrongFocus);
		setMouseTracking(true);
		setMinimumSize(80, 60);
		resizeTimer_.setSingleShot(true);
		resizeTimer_.setInterval(250);
		connect(&resizeTimer_, &QTimer::timeout, this, [this] {
			if (isVisible())
				restartRenderer();
		});
	}

	~WebPanel() override { stopRenderer(); }

	void setUrl(const QString &url)
	{
		if (url_ == url)
			return;
		url_ = url;
		if (isVisible())
			restartRenderer();
	}

	void setDockTitle(const QString &title)
	{
		for (QWidget *ancestor = parentWidget(); ancestor; ancestor = ancestor->parentWidget()) {
			if (auto *dock = qobject_cast<QDockWidget *>(ancestor)) {
				dock->setWindowTitle(title);
				break;
			}
		}
	}

protected:
	bool event(QEvent *event) override
	{
		const auto dockClosed = static_cast<QEvent::Type>(QEvent::User + QEvent::Close);
		if (event->type() == dockClosed)
			stopRenderer();
		return QWidget::event(event);
	}

	void paintEvent(QPaintEvent *) override
	{
		QPainter painter(this);
		painter.fillRect(rect(), palette().color(QPalette::Base));
		if (!frame_.isNull()) {
			painter.setRenderHint(QPainter::SmoothPixmapTransform, true);
			painter.drawImage(rect(), frame_);
		} else if (!status_.isEmpty()) {
			painter.setPen(palette().color(QPalette::Text));
			painter.drawText(rect().adjusted(16, 16, -16, -16), Qt::AlignCenter | Qt::TextWordWrap,
					 status_);
		}
	}

	void showEvent(QShowEvent *event) override
	{
		QWidget::showEvent(event);
		if (pid_ <= 0)
			QTimer::singleShot(0, this, [this] { startRenderer(); });
	}

	void hideEvent(QHideEvent *event) override
	{
		resizeTimer_.stop();
		stopRenderer();
		QWidget::hideEvent(event);
	}

	void resizeEvent(QResizeEvent *event) override
	{
		QWidget::resizeEvent(event);
		if (pid_ > 0)
			resizeTimer_.start();
	}

	void mouseMoveEvent(QMouseEvent *event) override
	{
		auto [x, y] = rendererPosition(event->position());
		owb_command command{};
		command.type = OWB_MOUSE_MOVE;
		command.x = x;
		command.y = y;
		command.modifiers = interactionModifiers(event->modifiers(), event->buttons());
		sendCommand(command);
	}

	void leaveEvent(QEvent *event) override
	{
		owb_command command{};
		command.type = OWB_MOUSE_MOVE;
		command.value1 = 1;
		sendCommand(command);
		QWidget::leaveEvent(event);
	}

	void mousePressEvent(QMouseEvent *event) override
	{
		setFocus(Qt::MouseFocusReason);
		sendMouseButton(event, false);
	}

	void mouseReleaseEvent(QMouseEvent *event) override { sendMouseButton(event, true); }

	void wheelEvent(QWheelEvent *event) override
	{
		auto [x, y] = rendererPosition(event->position());
		owb_command command{};
		command.type = OWB_MOUSE_WHEEL;
		command.x = x;
		command.y = y;
		command.value1 = event->angleDelta().x();
		command.value2 = event->angleDelta().y();
		command.modifiers = interactionModifiers(event->modifiers(), event->buttons());
		sendCommand(command);
		event->accept();
	}

	void focusInEvent(QFocusEvent *event) override
	{
		owb_command command{};
		command.type = OWB_FOCUS;
		command.value1 = 1;
		sendCommand(command);
		QWidget::focusInEvent(event);
	}

	void focusOutEvent(QFocusEvent *event) override
	{
		owb_command command{};
		command.type = OWB_FOCUS;
		sendCommand(command);
		QWidget::focusOutEvent(event);
	}

	void keyPressEvent(QKeyEvent *event) override { sendKey(event, false); }
	void keyReleaseEvent(QKeyEvent *event) override { sendKey(event, true); }

	void contextMenuEvent(QContextMenuEvent *event) override
	{
		QMenu menu(this);
		QAction *reload = menu.addAction(text("Reload"));
		if (menu.exec(event->globalPos()) == reload) {
			owb_command command{};
			command.type = OWB_RELOAD;
			sendCommand(command);
		}
	}

private:
	std::pair<int32_t, int32_t> rendererPosition(const QPointF &position) const
	{
		const double sx = width() > 0 ? static_cast<double>(renderWidth_) / width() : 1.0;
		const double sy = height() > 0 ? static_cast<double>(renderHeight_) / height() : 1.0;
		int x = std::clamp(static_cast<int>(position.x() * sx), 0, std::max(0, renderWidth_ - 1));
		int y = std::clamp(static_cast<int>(position.y() * sy), 0, std::max(0, renderHeight_ - 1));
		return {x, y};
	}

	static uint32_t interactionModifiers(Qt::KeyboardModifiers keys, Qt::MouseButtons buttons)
	{
		uint32_t result = 0;
		if (keys & Qt::ShiftModifier)
			result |= INTERACT_SHIFT_KEY;
		if (keys & Qt::ControlModifier)
			result |= INTERACT_CONTROL_KEY;
		if (keys & Qt::AltModifier)
			result |= INTERACT_ALT_KEY;
		if (keys & Qt::MetaModifier)
			result |= INTERACT_COMMAND_KEY;
		if (buttons & Qt::LeftButton)
			result |= INTERACT_MOUSE_LEFT;
		if (buttons & Qt::MiddleButton)
			result |= INTERACT_MOUSE_MIDDLE;
		if (buttons & Qt::RightButton)
			result |= INTERACT_MOUSE_RIGHT;
		return result;
	}

	void sendMouseButton(QMouseEvent *event, bool released)
	{
		auto [x, y] = rendererPosition(event->position());
		owb_command command{};
		command.type = OWB_MOUSE_CLICK;
		command.x = x;
		command.y = y;
		command.value1 = event->button() == Qt::MiddleButton ? MOUSE_MIDDLE
				 : event->button() == Qt::RightButton ? MOUSE_RIGHT
							    : MOUSE_LEFT;
		command.value2 = released;
		command.text_length = static_cast<uint32_t>(event->type() == QEvent::MouseButtonDblClick ? 2 : 1);
		command.modifiers = interactionModifiers(event->modifiers(), event->buttons());
		sendCommand(command);
		event->accept();
	}

	void sendKey(QKeyEvent *event, bool released)
	{
		owb_command command{};
		command.type = OWB_KEY;
		command.value1 = released;
		command.value2 = static_cast<int32_t>(event->nativeVirtualKey());
		command.modifiers = interactionModifiers(event->modifiers(), {});
		QByteArray utf8 = event->text().toUtf8();
		command.text_length = static_cast<uint32_t>(std::min<size_t>(utf8.size(), sizeof(command.text)));
		memcpy(command.text, utf8.constData(), command.text_length);
		sendCommand(command);
		event->accept();
	}

	void sendCommand(owb_command &command)
	{
		if (controlFd_ < 0)
			return;
		command.magic = OWB_COMMAND_MAGIC;
		writeAll(controlFd_, &command, sizeof(command));
	}

	bool sendConfiguration()
	{
		QByteArray url = url_.trimmed().toUtf8();
		if (url.isEmpty())
			url = "about:blank";
		owb_config_header header{};
		header.magic = OWB_CONFIG_MAGIC;
		header.version = OWB_PROTOCOL_VERSION;
		header.width = static_cast<uint32_t>(renderWidth_);
		header.height = static_cast<uint32_t>(renderHeight_);
		header.fps = 30;
		header.transparent = 0;
		header.hardware_acceleration = 1;
		header.url_length = static_cast<uint32_t>(url.size());
		return writeAll(controlFd_, &header, sizeof(header)) &&
		       writeAll(controlFd_, url.constData(), static_cast<size_t>(url.size()));
	}

	void startRenderer()
	{
		if (pid_ > 0 || !isVisible())
			return;
		status_ = text("PanelLoading");
		frame_ = QImage();
		update();

		const double scale = devicePixelRatioF();
		renderWidth_ = std::clamp(static_cast<int>(width() * scale), 2, 8192);
		renderHeight_ = std::clamp(static_cast<int>(height() * scale), 2, 8192);
		sharedSize_ = owb_shared_size(renderWidth_, renderHeight_);
		sharedFd_ = memfd_create("obs-webkit-browser-dock", MFD_CLOEXEC);
		if (sharedFd_ < 0 || ftruncate(sharedFd_, static_cast<off_t>(sharedSize_)) != 0)
			return startFailed(text("PanelRendererError"));
		shared_ = static_cast<owb_shared_frames *>(
			mmap(nullptr, sharedSize_, PROT_READ | PROT_WRITE, MAP_SHARED, sharedFd_, 0));
		if (shared_ == MAP_FAILED) {
			shared_ = nullptr;
			return startFailed(text("PanelRendererError"));
		}
		memset(shared_, 0, sizeof(*shared_));
		shared_->magic = OWB_SHARED_MAGIC;
		shared_->version = OWB_PROTOCOL_VERSION;
		shared_->width = static_cast<uint32_t>(renderWidth_);
		shared_->height = static_cast<uint32_t>(renderHeight_);
		shared_->stride = static_cast<uint32_t>(renderWidth_ * 4);
		shared_->slot_count = OWB_SHARED_FRAME_SLOTS;

		int control[2] = {-1, -1};
		int frames[2] = {-1, -1};
		int logs[2] = {-1, -1};
		if (socketpair(AF_UNIX, SOCK_STREAM, 0, control) != 0 || pipe(frames) != 0 || pipe(logs) != 0) {
			for (int fd : control)
				if (fd >= 0)
					::close(fd);
			for (int fd : frames)
				if (fd >= 0)
					::close(fd);
			for (int fd : logs)
				if (fd >= 0)
					::close(fd);
			return startFailed(text("PanelRendererError"));
		}
		for (int fd : control)
			closeOnExec(fd);
		for (int fd : frames)
			closeOnExec(fd);
		for (int fd : logs)
			closeOnExec(fd);

		char *helper = obs_module_file("obs-webkit-renderer");
		if (!helper || access(helper, X_OK) != 0) {
			for (int fd : control)
				::close(fd);
			for (int fd : frames)
				::close(fd);
			for (int fd : logs)
				::close(fd);
			bfree(helper);
			return startFailed(text("PanelRendererMissing"));
		}

		posix_spawn_file_actions_t actions;
		posix_spawnattr_t attributes;
		posix_spawn_file_actions_init(&actions);
		posix_spawnattr_init(&attributes);
		sigset_t defaults;
		sigemptyset(&defaults);
		sigaddset(&defaults, SIGTERM);
		sigaddset(&defaults, SIGINT);
		sigaddset(&defaults, SIGPIPE);
		posix_spawnattr_setsigdefault(&attributes, &defaults);
		posix_spawnattr_setpgroup(&attributes, 0);
		posix_spawnattr_setflags(&attributes, POSIX_SPAWN_SETSIGDEF | POSIX_SPAWN_SETPGROUP);
		posix_spawn_file_actions_adddup2(&actions, control[1], STDIN_FILENO);
		posix_spawn_file_actions_adddup2(&actions, frames[1], STDOUT_FILENO);
		posix_spawn_file_actions_adddup2(&actions, logs[1], STDERR_FILENO);
		posix_spawn_file_actions_adddup2(&actions, sharedFd_, OWB_SHARED_FRAME_FD);
		posix_spawn_file_actions_addclose(&actions, control[0]);
		posix_spawn_file_actions_addclose(&actions, frames[0]);
		posix_spawn_file_actions_addclose(&actions, logs[0]);
		char *argv[] = {helper, nullptr};
		pid_t child = 0;
		int spawnError = posix_spawn(&child, helper, &actions, &attributes, argv, environ);
		posix_spawn_file_actions_destroy(&actions);
		posix_spawnattr_destroy(&attributes);
		bfree(helper);
		::close(control[1]);
		::close(frames[1]);
		::close(logs[1]);
		if (spawnError != 0) {
			::close(control[0]);
			::close(frames[0]);
			::close(logs[0]);
			return startFailed(text("PanelRendererError"));
		}

		pid_ = child;
		controlFd_ = control[0];
		frameFd_ = frames[0];
		logFd_ = logs[0];
		nonBlocking(frameFd_);
		nonBlocking(logFd_);
		if (!sendConfiguration()) {
			stopRenderer();
			return startFailed(text("PanelRendererError"));
		}
		frameNotifier_ = new QSocketNotifier(frameFd_, QSocketNotifier::Read, this);
		connect(frameNotifier_, &QSocketNotifier::activated, this, [this] { readFrames(); });
		logNotifier_ = new QSocketNotifier(logFd_, QSocketNotifier::Read, this);
		connect(logNotifier_, &QSocketNotifier::activated, this, [this] { readLogs(); });
	}

	void startFailed(const QString &message)
	{
		status_ = message;
		stopRenderer();
		update();
	}

	void restartRenderer()
	{
		stopRenderer();
		startRenderer();
	}

	void stopRenderer()
	{
		delete frameNotifier_;
		frameNotifier_ = nullptr;
		delete logNotifier_;
		logNotifier_ = nullptr;
		if (controlFd_ >= 0)
			shutdown(controlFd_, SHUT_RDWR);
		closeFd(controlFd_);
		closeFd(frameFd_);
		closeFd(logFd_);
		if (pid_ > 0) {
			kill(-pid_, SIGTERM);
			for (unsigned attempt = 0; attempt < 50; ++attempt) {
				pid_t result = waitpid(pid_, nullptr, WNOHANG);
				if (result == pid_ || (result < 0 && errno == ECHILD)) {
					pid_ = 0;
					break;
				}
				usleep(10000);
			}
			if (pid_ > 0) {
				kill(-pid_, SIGKILL);
				while (waitpid(pid_, nullptr, 0) < 0 && errno == EINTR) {
				}
				pid_ = 0;
			}
		}
		if (shared_)
			munmap(shared_, sharedSize_);
		shared_ = nullptr;
		sharedSize_ = 0;
		closeFd(sharedFd_);
		logBuffer_.clear();
	}

	void readFrames()
	{
		uint8_t frameSlots[128];
		uint8_t latest = OWB_SHARED_FRAME_SLOTS;
		for (;;) {
			ssize_t count = read(frameFd_, frameSlots, sizeof(frameSlots));
			if (count < 0 && errno == EINTR)
				continue;
			if (count <= 0)
				break;
			for (ssize_t i = 0; i < count; ++i)
				if (frameSlots[i] < OWB_SHARED_FRAME_SLOTS)
					latest = frameSlots[i];
		}
		if (!shared_ || latest >= OWB_SHARED_FRAME_SLOTS)
			return;
		for (unsigned attempt = 0; attempt < 3; ++attempt) {
			uint64_t before = __atomic_load_n(&shared_->sequence[latest], __ATOMIC_ACQUIRE);
			if (before & 1u)
				continue;
			QImage view(owb_shared_slot(shared_, latest), renderWidth_, renderHeight_, renderWidth_ * 4,
				    QImage::Format_ARGB32);
			QImage copy = view.copy();
			uint64_t after = __atomic_load_n(&shared_->sequence[latest], __ATOMIC_ACQUIRE);
			if (before == after && !(after & 1u)) {
				frame_ = std::move(copy);
				status_.clear();
				update();
				break;
			}
		}
	}

	void readLogs()
	{
		char bytes[1024];
		for (;;) {
			ssize_t count = read(logFd_, bytes, sizeof(bytes));
			if (count < 0 && errno == EINTR)
				continue;
			if (count <= 0)
				break;
			logBuffer_.append(bytes, static_cast<qsizetype>(count));
		}
		for (;;) {
			qsizetype newline = logBuffer_.indexOf('\n');
			if (newline < 0)
				break;
			QByteArray line = logBuffer_.left(newline).trimmed();
			logBuffer_.remove(0, newline + 1);
			if (!line.isEmpty())
				blog(LOG_INFO, "[obs-webkit-browser dock] %s", line.constData());
		}
	}

	QString url_;
	QString status_;
	QImage frame_;
	QTimer resizeTimer_;
	pid_t pid_ = 0;
	int controlFd_ = -1;
	int frameFd_ = -1;
	int logFd_ = -1;
	int sharedFd_ = -1;
	owb_shared_frames *shared_ = nullptr;
	size_t sharedSize_ = 0;
	int renderWidth_ = 2;
	int renderHeight_ = 2;
	QSocketNotifier *frameNotifier_ = nullptr;
	QSocketNotifier *logNotifier_ = nullptr;
	QByteArray logBuffer_;
};

class DockManager final {
public:
	DockManager()
	{
		obs_frontend_add_save_callback(saveCallback, this);
		obs_frontend_add_preload_callback(preloadCallback, this);
		obs_frontend_add_event_callback(eventCallback, this);
		setupFrontend();
	}

	~DockManager()
	{
		/* OBS clears frontend callbacks and owns the dock wrappers before
		 * unloading modules during shutdown. Calling frontend removal APIs
		 * from obs_module_unload is therefore too late. */
		panels_.clear();
		if (menuAction_)
			delete menuAction_;
	}

	void setupFrontend()
	{
		if (menuAction_ || !QApplication::instance())
			return;
		auto *main = static_cast<QMainWindow *>(obs_frontend_get_main_window());
		if (!main)
			return;
		menuAction_ = new QAction(text("CustomBrowserDocks"), main);
		QObject::connect(menuAction_, &QAction::triggered, main, [this] { showEditor(); });
		if (QMenu *docksMenu = main->findChild<QMenu *>("menuDocks"))
			docksMenu->addAction(menuAction_);
		else
			main->menuBar()->addAction(menuAction_);
		reconcile();
	}

private:
	static QString dockId(const QString &id) { return QString::fromUtf8(kDockPrefix) + id; }

	static void eventCallback(obs_frontend_event event, void *opaque)
	{
		auto *manager = static_cast<DockManager *>(opaque);
		if (event == OBS_FRONTEND_EVENT_FINISHED_LOADING)
			manager->setupFrontend();
		else if (event == OBS_FRONTEND_EVENT_EXIT) {
			manager->panels_.clear();
			manager->menuAction_ = nullptr;
		}
	}

	static void saveCallback(obs_data_t *saveData, bool saving, void *opaque)
	{
		static_cast<DockManager *>(opaque)->saveLoad(saveData, saving);
	}

	static void preloadCallback(obs_data_t *saveData, bool saving, void *opaque)
	{
		if (!saving)
			static_cast<DockManager *>(opaque)->saveLoad(saveData, false);
	}

	void saveLoad(obs_data_t *saveData, bool saving)
	{
		if (saving) {
			obs_data_array_t *array = obs_data_array_create();
			for (const DockDefinition &definition : definitions_) {
				obs_data_t *item = obs_data_create();
				obs_data_set_string(item, "id", definition.id.toUtf8().constData());
				obs_data_set_string(item, "title", definition.title.toUtf8().constData());
				obs_data_set_string(item, "url", definition.url.toUtf8().constData());
				obs_data_array_push_back(array, item);
				obs_data_release(item);
			}
			obs_data_set_array(saveData, kSaveKey, array);
			obs_data_array_release(array);
			return;
		}

		definitions_.clear();
		obs_data_array_t *array = obs_data_get_array(saveData, kSaveKey);
		if (array) {
			size_t count = obs_data_array_count(array);
			for (size_t index = 0; index < count; ++index) {
				obs_data_t *item = obs_data_array_item(array, index);
				DockDefinition definition{
					QString::fromUtf8(obs_data_get_string(item, "id")),
					QString::fromUtf8(obs_data_get_string(item, "title")),
					QString::fromUtf8(obs_data_get_string(item, "url")),
				};
				if (definition.id.isEmpty())
					definition.id = QUuid::createUuid().toString(QUuid::WithoutBraces);
				if (!definition.title.trimmed().isEmpty() && !definition.url.trimmed().isEmpty())
					definitions_.push_back(std::move(definition));
				obs_data_release(item);
			}
			obs_data_array_release(array);
		}
		reconcile();
	}

	void reconcile()
	{
		if (!menuAction_)
			return;
		QHash<QString, DockDefinition> wanted;
		for (const DockDefinition &definition : definitions_)
			wanted.insert(definition.id, definition);
		for (auto it = panels_.begin(); it != panels_.end();) {
			if (!wanted.contains(it.key())) {
				QByteArray id = dockId(it.key()).toUtf8();
				obs_frontend_remove_dock(id.constData());
				it = panels_.erase(it);
			} else {
				++it;
			}
		}
		for (const DockDefinition &definition : definitions_) {
			if (panels_.contains(definition.id) && panels_[definition.id]) {
				panels_[definition.id]->setUrl(definition.url);
				panels_[definition.id]->setDockTitle(definition.title);
				continue;
			}
			auto *panel = new WebPanel(definition.url);
			QByteArray id = dockId(definition.id).toUtf8();
			QByteArray title = definition.title.toUtf8();
			if (obs_frontend_add_dock_by_id(id.constData(), title.constData(), panel))
				panels_.insert(definition.id, panel);
			else
				delete panel;
		}
	}

	void showEditor()
	{
		auto *main = static_cast<QWidget *>(obs_frontend_get_main_window());
		QDialog dialog(main);
		dialog.setWindowTitle(text("CustomBrowserDocks"));
		dialog.resize(720, 360);
		auto *layout = new QVBoxLayout(&dialog);
		layout->addWidget(new QLabel(text("CustomBrowserDocksDescription"), &dialog));
		auto *table = new QTableWidget(0, 2, &dialog);
		table->setHorizontalHeaderLabels({text("PanelName"), text("URL")});
		table->horizontalHeader()->setSectionResizeMode(0, QHeaderView::ResizeToContents);
		table->horizontalHeader()->setSectionResizeMode(1, QHeaderView::Stretch);
		table->setSelectionBehavior(QAbstractItemView::SelectRows);
		table->setSelectionMode(QAbstractItemView::ExtendedSelection);
		layout->addWidget(table);

		auto appendRow = [table](const DockDefinition &definition) {
			int row = table->rowCount();
			table->insertRow(row);
			auto *title = new QTableWidgetItem(definition.title);
			title->setData(Qt::UserRole, definition.id);
			table->setItem(row, 0, title);
			table->setItem(row, 1, new QTableWidgetItem(definition.url));
		};
		for (const DockDefinition &definition : definitions_)
			appendRow(definition);

		auto *rowButtons = new QHBoxLayout;
		auto *add = new QPushButton(text("AddPanel"), &dialog);
		auto *remove = new QPushButton(text("RemovePanel"), &dialog);
		rowButtons->addWidget(add);
		rowButtons->addWidget(remove);
		rowButtons->addStretch();
		layout->addLayout(rowButtons);
		QObject::connect(add, &QPushButton::clicked, table, [table, appendRow] {
			appendRow({QUuid::createUuid().toString(QUuid::WithoutBraces), QString(), "https://"});
			int row = table->rowCount() - 1;
			table->setCurrentCell(row, 0);
			table->editItem(table->item(row, 0));
		});
		QObject::connect(remove, &QPushButton::clicked, table, [table] {
			QSet<int> rows;
			for (QTableWidgetItem *item : table->selectedItems())
				rows.insert(item->row());
			QList<int> sorted = rows.values();
			std::sort(sorted.begin(), sorted.end(), std::greater<int>());
			for (int row : sorted)
				table->removeRow(row);
		});

		auto *buttons = new QDialogButtonBox(QDialogButtonBox::Apply | QDialogButtonBox::Close,
						     Qt::Horizontal, &dialog);
		layout->addWidget(buttons);
		QObject::connect(buttons->button(QDialogButtonBox::Close), &QPushButton::clicked, &dialog,
				 &QDialog::reject);
		QObject::connect(buttons->button(QDialogButtonBox::Apply), &QPushButton::clicked, &dialog,
				 [this, table, &dialog] {
					QVector<DockDefinition> updated;
					QSet<QString> titles;
					for (int row = 0; row < table->rowCount(); ++row) {
						QString title = table->item(row, 0) ? table->item(row, 0)->text().trimmed() : QString();
						QString url = table->item(row, 1) ? table->item(row, 1)->text().trimmed() : QString();
						if (title.isEmpty() || url.isEmpty()) {
							QMessageBox::warning(&dialog, text("CustomBrowserDocks"), text("PanelFieldsRequired"));
							return;
						}
						if (titles.contains(title)) {
							QMessageBox::warning(&dialog, text("CustomBrowserDocks"), text("PanelNamesUnique"));
							return;
						}
						titles.insert(title);
						QString id = table->item(row, 0)->data(Qt::UserRole).toString();
						if (id.isEmpty())
							id = QUuid::createUuid().toString(QUuid::WithoutBraces);
						updated.push_back({id, title, url});
					}
					definitions_ = std::move(updated);
					reconcile();
					obs_frontend_save();
				});
		dialog.exec();
	}

	QVector<DockDefinition> definitions_;
	QHash<QString, QPointer<WebPanel>> panels_;
	QPointer<QAction> menuAction_;
};

DockManager *manager = nullptr;

} // namespace

extern "C" void owb_docks_initialize(void)
{
	if (!manager && QApplication::instance())
		manager = new DockManager;
}

extern "C" void owb_docks_shutdown(void)
{
	delete manager;
	manager = nullptr;
}