/*
 * Copyright (c) 2022, Andreas Kling <andreas@ladybird.org>
 * Copyright (c) 2023, Sam Atkins <atkinssj@serenityos.org>
 *
 * SPDX-License-Identifier: BSD-2-Clause
 */

#pragma once

#include <LibWeb/CSS/Length.h>
#include <LibWeb/CSS/PercentageOr.h>

namespace Web::CSS {

class Size {
public:
    enum class Type {
        Auto,
        Calculated,
        Length,
        Percentage,
        MinContent,
        MaxContent,
        FitContent,
        None, // NOTE: This is only valid for max-width and max-height.
    };

    static Size make_auto();
    static Size make_px(CSSPixels);
    static Size make_length(Length);
    static Size make_percentage(Percentage);
    static Size make_calculated(NonnullRefPtr<CalculatedStyleValue const>);
    static Size make_length_percentage(LengthPercentage const&);
    static Size make_min_content();
    static Size make_max_content();
    static Size make_fit_content(LengthPercentage available_space);
    static Size make_fit_content();
    static Size make_none();

    static Size from_style_value(NonnullRefPtr<StyleValue const> const&);

    bool is_auto() const { return m_type == Type::Auto; }
    bool is_calculated() const { return m_type == Type::Calculated; }
    bool is_length() const { return m_type == Type::Length; }
    bool is_percentage() const { return m_type == Type::Percentage; }
    bool is_min_content() const { return m_type == Type::MinContent; }
    bool is_max_content() const { return m_type == Type::MaxContent; }
    bool is_fit_content() const { return m_type == Type::FitContent; }
    bool is_none() const { return m_type == Type::None; }
    Type type() const { return m_type; }

    bool is_intrinsic_sizing_constraint() const { return is_min_content() || is_max_content() || is_fit_content(); }
    bool is_length_percentage() const { return is_length() || is_percentage() || is_calculated(); }

    [[nodiscard]] CSSPixels to_px(Layout::Node const&, CSSPixels reference_value) const;

    bool contains_percentage() const;

    CalculatedStyleValue const& calculated() const
    {
        VERIFY(is_calculated());
        return m_length_percentage->calculated();
    }

    Length const& length() const
    {
        VERIFY(is_length());
        return m_length_percentage->length();
    }

    Percentage const& percentage() const
    {
        VERIFY(is_percentage());
        return m_length_percentage->percentage();
    }

    LengthPercentage const& length_percentage() const
    {
        VERIFY(is_length_percentage());
        return *m_length_percentage;
    }

    Optional<LengthPercentage> const& fit_content_available_space() const
    {
        VERIFY(is_fit_content());
        return m_length_percentage;
    }

    void serialize(StringBuilder&, SerializationMode) const;
    String to_string(SerializationMode) const;
    bool operator==(Size const&) const = default;

private:
    explicit Size(Type type, Optional<LengthPercentage> = {});

    Type m_type {};
    Optional<LengthPercentage> m_length_percentage;
};

}

template<>
struct AK::Formatter<Web::CSS::Size> : Formatter<StringView> {
    ErrorOr<void> format(FormatBuilder& builder, Web::CSS::Size const& size)
    {
        return Formatter<StringView>::format(builder, size.to_string(Web::CSS::SerializationMode::Normal));
    }
};
