/* SPDX-FileCopyrightText: 2026 Project Tick
 * SPDX-License-Identifier: GPL-3.0-or-later
 */

#include "BackupPage.h"
#include "ui_BackupPage.h"

BackupPage::BackupPage(InstancePtr instance, QWidget* parent)
	: QWidget(parent), ui(new Ui::BackupPage), m_instance(instance)
{
	ui->setupUi(this);

	m_manager = std::make_unique<BackupManager>(m_instance->id(),
												m_instance->instanceRoot());

	ui->backupList->header()->setStretchLastSection(false);
	ui->backupList->header()->setSectionResizeMode(0, QHeaderView::Stretch);
	ui->backupList->header()->setSectionResizeMode(
		1, QHeaderView::ResizeToContents);
	ui->backupList->header()->setSectionResizeMode(
		2, QHeaderView::ResizeToContents);

	connect(ui->backupList, &QTreeWidget::itemSelectionChanged, this,
			&BackupPage::onSelectionChanged);

	refreshList();
}

BackupPage::~BackupPage()
{
	delete ui;
}

QIcon BackupPage::icon() const
{
	return APPLICATION->getThemedIcon("backup");
}

void BackupPage::openedImpl()
{
	refreshList();
}

void BackupPage::refreshList()
{
	ui->backupList->clear();
	m_entries = m_manager->listBackups();

	for (const auto& entry : m_entries) {
		auto* item = new QTreeWidgetItem(ui->backupList);
		item->setText(0, entry.name.isEmpty() ? entry.fileName : entry.name);
		item->setText(1, entry.timestamp.toString("yyyy-MM-dd HH:mm:ss"));
		item->setText(2, humanFileSize(entry.sizeBytes));
		item->setData(0, Qt::UserRole, entry.fullPath);
	}

	int count = m_entries.size();
	ui->statusLabel->setText(tr("%n backup(s)", "", count));
	updateButtons();
}

void BackupPage::updateButtons()
{
	bool hasSelection = !ui->backupList->selectedItems().isEmpty();
	ui->btnRestore->setEnabled(hasSelection);
	ui->btnExport->setEnabled(hasSelection);
	ui->btnDelete->setEnabled(hasSelection);
}

void BackupPage::onSelectionChanged()
{
	updateButtons();
}

BackupEntry BackupPage::selectedEntry() const
{
	auto items = ui->backupList->selectedItems();
	if (items.isEmpty())
		return {};

	QString path = items.first()->data(0, Qt::UserRole).toString();
	for (const auto& e : m_entries) {
		if (e.fullPath == path)
			return e;
	}
	return {};
}

void BackupPage::on_btnCreate_clicked()
{
	bool ok = false;
	QString label = QInputDialog::getText(this, tr("Create Backup"),
										  tr("Backup label (optional):"),
										  QLineEdit::Normal, {}, &ok);

	if (!ok)
		return;

	ui->statusLabel->setText(tr("Creating backup..."));
	QApplication::processEvents();

	auto entry = m_manager->createBackup(label);
	if (entry.fullPath.isEmpty()) {
		QMessageBox::warning(
			this, tr("Backup Failed"),
			tr("Failed to create backup. Check the logs for details."));
	} else {
		QMessageBox::information(
			this, tr("Backup Created"),
			tr("Backup created successfully:\n%1").arg(entry.fileName));
	}

	refreshList();
}

void BackupPage::on_btnRestore_clicked()
{
	auto entry = selectedEntry();
	if (entry.fullPath.isEmpty())
		return;

	auto ret = QMessageBox::warning(
		this, tr("Restore Backup"),
		tr("This will replace the current instance contents with the "
		   "backup:\n\n"
		   "%1\n\n"
		   "This action cannot be undone. Continue?")
			.arg(entry.fileName),
		QMessageBox::Yes | QMessageBox::No, QMessageBox::No);

	if (ret != QMessageBox::Yes)
		return;

	ui->statusLabel->setText(tr("Restoring backup..."));
	QApplication::processEvents();

	if (m_manager->restoreBackup(entry)) {
		QMessageBox::information(this, tr("Restore Complete"),
								 tr("Backup restored successfully."));
	} else {
		QMessageBox::warning(
			this, tr("Restore Failed"),
			tr("Failed to restore backup. Check the logs for details."));
	}

	refreshList();
}

void BackupPage::on_btnExport_clicked()
{
	auto entry = selectedEntry();
	if (entry.fullPath.isEmpty())
		return;

	QString dest = QFileDialog::getSaveFileName(
		this, tr("Export Backup"), entry.fileName, tr("Zip Files (*.zip)"));

	if (dest.isEmpty())
		return;

	if (m_manager->exportBackup(entry, dest)) {
		QMessageBox::information(this, tr("Export Complete"),
								 tr("Backup exported to:\n%1").arg(dest));
	} else {
		QMessageBox::warning(this, tr("Export Failed"),
							 tr("Failed to export backup."));
	}
}

void BackupPage::on_btnImport_clicked()
{
	QString src = QFileDialog::getOpenFileName(this, tr("Import Backup"), {},
											   tr("Zip Files (*.zip)"));

	if (src.isEmpty())
		return;

	bool ok = false;
	QString label = QInputDialog::getText(
		this, tr("Import Backup"), tr("Label for imported backup (optional):"),
		QLineEdit::Normal, {}, &ok);

	if (!ok)
		return;

	auto entry = m_manager->importBackup(src, label);
	if (entry.fullPath.isEmpty()) {
		QMessageBox::warning(this, tr("Import Failed"),
							 tr("Failed to import backup."));
	} else {
		QMessageBox::information(this, tr("Import Complete"),
								 tr("Backup imported successfully."));
	}

	refreshList();
}

void BackupPage::on_btnDelete_clicked()
{
	auto entry = selectedEntry();
	if (entry.fullPath.isEmpty())
		return;

	auto ret = QMessageBox::question(
		this, tr("Delete Backup"),
		tr("Delete the selected backup?\n\n%1\n\nThis cannot be undone.")
			.arg(entry.fileName),
		QMessageBox::Yes | QMessageBox::No, QMessageBox::No);

	if (ret != QMessageBox::Yes)
		return;

	m_manager->deleteBackup(entry);
	refreshList();
}

QString BackupPage::humanFileSize(qint64 bytes) const
{
	if (bytes < 1024)
		return QString("%1 B").arg(bytes);
	if (bytes < 1024 * 1024)
		return QString("%1 KiB").arg(bytes / 1024.0, 0, 'f', 1);
	if (bytes < 1024LL * 1024 * 1024)
		return QString("%1 MiB").arg(bytes / (1024.0 * 1024.0), 0, 'f', 1);
	return QString("%1 GiB").arg(bytes / (1024.0 * 1024.0 * 1024.0), 0, 'f', 2);
}
