/*
 * Oak Video Editor - Non-Linear Video Editor
 * Copyright (C) 2025 Olive CE Team
 *
 * This program 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.
 *
 * This program 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 for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

#include "nodevaluetree.h"

#include <QEvent>

#include "oakengine/traverse.h"
#include "oakengine/node.h"

namespace olive
{

/**
 * @brief Local mirror of the engine's value-hint triple (type, index, tag)
 * carried in the radio buttons' "hint" property.
 */
struct ValueHint {
	int type = 0;
	int index = -1;
	QString tag;
};

}

Q_DECLARE_METATYPE(olive::ValueHint)

namespace olive
{

#define super QTreeWidget

NodeValueTree::NodeValueTree(QWidget *parent)
	: super(parent)
{
	setColumnWidth(0, 0);
	setColumnCount(4);

	QSizePolicy p = sizePolicy();
	p.setHorizontalStretch(1);
	setSizePolicy(p);

	static const int k_minimum_rows = 10;
	setMinimumHeight(fontMetrics().height() * k_minimum_rows);

	retranslate();
}

void NodeValueTree::set_node(const oak::Input &input, const Rational &time)
{
	clear();

	oak::Node connected_node = input.connected_node();

	// WRAPPER-GAP: oakengine_traverse_* (traverse API has no oak:: wrapper)
	OakEngineTraverseDb *table_db = oakengine_traverse_generate_table(
		connected_node.handle(),
		time.numerator(), time.denominator(), time.numerator(),
		time.denominator());

	int db_index = 0;
	int row_count = oakengine_traverse_db_row_count(table_db, db_index);

	// WRAPPER-GAP: oakengine_traverse_table_element_index_for_hint
	int index = oakengine_traverse_table_element_index_for_hint(
		input.node_handle(),
		input.input_id().toUtf8().constData(), input.element(), table_db);

	for (int i = 0; i < row_count; i++) {
		QTreeWidgetItem *item = new QTreeWidgetItem(this);

		int type = oakengine_traverse_row_type(table_db, db_index, i);
		OakEngineNode *source = oakengine_traverse_row_source(table_db, db_index,
															 i);
		const char *tag = oakengine_traverse_row_tag(table_db, db_index, i);

		ValueHint hint;
		hint.type = type;
		hint.index = row_count - 1 - i;
		hint.tag = QString(tag);

		QRadioButton *radio = new QRadioButton(this);
		radio->setProperty("input", QVariant::fromValue(input));
		radio->setProperty("hint", QVariant::fromValue(hint));
		if (i == index) {
			radio->setChecked(true);
		}
		connect(radio, &QRadioButton::clicked, this,
				&NodeValueTree::radio_button_checked);

		setItemWidget(item, 0, radio);
		char name_buf[64];
		int len = oakengine_node_value_pretty_type_name(type, name_buf, sizeof(name_buf));
		if (len > 0 && len < static_cast<int>(sizeof(name_buf))) {
			name_buf[len] = '\0';
		} else {
			snprintf(name_buf, sizeof(name_buf), "Type %d", type);
		}
		item->setText(1, QString::fromUtf8(name_buf));

		const char *vs = oakengine_traverse_row_value_string(table_db, db_index, i);
		item->setText(2, vs ? QString(vs) : QString());

		if (source) {
			item->setText(3, oak::Node(source).label_and_name());
		} else {
			item->setText(3, QString());
		}
	}

	oakengine_traverse_db_free(table_db);
}

void NodeValueTree::changeEvent(QEvent *event)
{
	if (event->type() == QEvent::LanguageChange) {
		retranslate();
	}

	super::changeEvent(event);
}

void NodeValueTree::retranslate()
{
	setHeaderLabels({ QString(), tr("Type"), tr("Value"), tr("Source") });
}

void NodeValueTree::radio_button_checked(bool e)
{
	if (e) {
		QRadioButton *btn = static_cast<QRadioButton *>(sender());
		ValueHint hint = btn->property("hint").value<ValueHint>();
		oak::Input input = btn->property("input").value<oak::Input>();

		// WRAPPER-GAP: oakengine_node_set_value_hint
		oakengine_node_set_value_hint(
			input.node_handle(),
			input.input_id().toUtf8().constData(), input.element(),
			hint.type, hint.index,
			hint.tag.isEmpty() ? nullptr : hint.tag.toUtf8().constData());
	}
}

}