/*
 * Copyright (c) 2023, MacDue <macdue@dueutil.tech>
 *
 * SPDX-License-Identifier: BSD-2-Clause
 */

#include "EdgeStyleValue.h"

namespace Web::CSS {

String EdgeStyleValue::to_string(SerializationMode mode) const
{
    if (mode == CSSStyleValue::SerializationMode::ResolvedValue) {
        // FIXME: Figure out how to get the proper calculation context here
        CalculationContext context {};
        return resolved_value(context)->offset().to_string();
    }

    StringBuilder builder;

    if (m_properties.edge.has_value())
        builder.append(CSS::to_string(m_properties.edge.value()));

    if (m_properties.edge.has_value() && m_properties.offset.has_value())
        builder.append(' ');

    if (m_properties.offset.has_value())
        builder.append(m_properties.offset->to_string());

    return builder.to_string_without_validation();
}

ValueComparingNonnullRefPtr<EdgeStyleValue const> EdgeStyleValue::resolved_value(CalculationContext context) const
{
    if (edge() == PositionEdge::Right || edge() == PositionEdge::Bottom) {
        if (offset().is_percentage()) {
            auto flipped_percentage = 100 - offset().percentage().value();
            return create({}, Percentage(flipped_percentage));
        }

        Vector<NonnullRefPtr<CalculationNode const>> sum_parts;
        sum_parts.append(NumericCalculationNode::create(Percentage(100), context));
        if (offset().is_length()) {
            sum_parts.append(NegateCalculationNode::create(NumericCalculationNode::create(offset().length(), context)));
        } else {
            // FIXME: Flip calculated offsets (convert CalculatedStyleValue to CalculationNode, then negate and append)
            return *this;
        }
        auto flipped_absolute = CalculatedStyleValue::create(SumCalculationNode::create(move(sum_parts)), CSSNumericType(CSSNumericType::BaseType::Length, 1), context);
        return create({}, flipped_absolute);
    }

    return *this;
}

}