/*

 * Copyright (c) 2018-2024, Andreas Kling <andreas@ladybird.org>

 *

 * SPDX-License-Identifier: BSD-2-Clause

 */

#pragma once

#include <AK/HashMap.h>

#include <AK/NonnullRefPtr.h>

#include <LibGfx/Font/Font.h>

#include <LibGfx/FontCascadeList.h>

#include <LibGfx/Forward.h>

#include <LibJS/Heap/GCPtr.h>

#include <LibWeb/CSS/ComputedValues.h>

#include <LibWeb/CSS/LengthBox.h>

#include <LibWeb/CSS/PropertyID.h>

#include <LibWeb/CSS/StyleProperty.h>

namespace Web::CSS {

class StyleProperties : public RefCounted<StyleProperties> {

public:

    static constexpr size_t number_of_properties = to_underlying(CSS::last_property_id) + 1;

private:

    struct Data : public RefCounted<Data> {

        friend class StyleComputer;

        NonnullRefPtr<Data> clone() const;

        // FIXME: These need protection from GC!

        JS::GCPtr<CSS::CSSStyleDeclaration const> m_animation_name_source;

        JS::GCPtr<CSS::CSSStyleDeclaration const> m_transition_property_source;

        Array<RefPtr<CSSStyleValue const>, number_of_properties> m_property_values;

        Array<u8, ceil_div(number_of_properties, 8uz)> m_property_important {};

        Array<u8, ceil_div(number_of_properties, 8uz)> m_property_inherited {};

        HashMap<CSS::PropertyID, NonnullRefPtr<CSSStyleValue const>> m_animated_property_values;

        int m_math_depth { InitialValues::math_depth() };

        mutable RefPtr<Gfx::FontCascadeList> m_font_list;

        Optional<CSSPixels> m_line_height;

    };

public:

    StyleProperties() = default;

    static NonnullRefPtr<StyleProperties> create() { return adopt_ref(*new StyleProperties); }

    NonnullRefPtr<StyleProperties> clone() const;

    template<typename Callback>

    inline void for_each_property(Callback callback) const

    {

        for (size_t i = 0; i < m_data->m_property_values.size(); ++i) {

            if (m_data->m_property_values[i])

                callback((CSS::PropertyID)i, *m_data->m_property_values[i]);

        }

    }

    enum class Inherited {

        No,

        Yes

    };

    HashMap<CSS::PropertyID, NonnullRefPtr<CSSStyleValue const>> const& animated_property_values() const { return m_data->m_animated_property_values; }

    void reset_animated_properties();

    bool is_property_important(CSS::PropertyID property_id) const;

    bool is_property_inherited(CSS::PropertyID property_id) const;

    void set_property_important(CSS::PropertyID, Important);

    void set_property_inherited(CSS::PropertyID, Inherited);

    void set_property(CSS::PropertyID, NonnullRefPtr<CSSStyleValue const> value, Inherited = Inherited::No, Important = Important::No);

    void set_animated_property(CSS::PropertyID, NonnullRefPtr<CSSStyleValue const> value);

    enum class WithAnimationsApplied {

        No,

        Yes,

    };

    NonnullRefPtr<CSSStyleValue const> property(CSS::PropertyID, WithAnimationsApplied = WithAnimationsApplied::Yes) const;

    RefPtr<CSSStyleValue const> maybe_null_property(CSS::PropertyID) const;

    void revert_property(CSS::PropertyID, StyleProperties const& style_for_revert);

    JS::GCPtr<CSS::CSSStyleDeclaration const> animation_name_source() const { return m_data->m_animation_name_source; }

    void set_animation_name_source(JS::GCPtr<CSS::CSSStyleDeclaration const> declaration) { m_data->m_animation_name_source = declaration; }

    JS::GCPtr<CSS::CSSStyleDeclaration const> transition_property_source() const { return m_data->m_transition_property_source; }

    void set_transition_property_source(JS::GCPtr<CSS::CSSStyleDeclaration const> declaration) { m_data->m_transition_property_source = declaration; }

    CSS::Size size_value(CSS::PropertyID) const;

    LengthPercentage length_percentage_or_fallback(CSS::PropertyID, LengthPercentage const& fallback) const;

    Optional<LengthPercentage> length_percentage(CSS::PropertyID) const;

    LengthBox length_box(CSS::PropertyID left_id, CSS::PropertyID top_id, CSS::PropertyID right_id, CSS::PropertyID bottom_id, const CSS::Length& default_value) const;

    Color color_or_fallback(CSS::PropertyID, Layout::NodeWithStyle const&, Color fallback) const;

    Optional<CSS::TextAnchor> text_anchor() const;

    Optional<CSS::TextAlign> text_align() const;

    Optional<CSS::TextJustify> text_justify() const;

    Optional<CSS::TextOverflow> text_overflow() const;

    CSS::Length border_spacing_horizontal(Layout::Node const&) const;

    CSS::Length border_spacing_vertical(Layout::Node const&) const;

    Optional<CSS::CaptionSide> caption_side() const;

    CSS::Clip clip() const;

    CSS::Display display() const;

    Optional<CSS::Float> float_() const;

    Optional<CSS::Clear> clear() const;

    Optional<CSS::ColumnSpan> column_span() const;

    struct ContentDataAndQuoteNestingLevel {

        CSS::ContentData content_data;

        u32 final_quote_nesting_level { 0 };

    };

    ContentDataAndQuoteNestingLevel content(DOM::Element&, u32 initial_quote_nesting_level) const;

    Optional<CSS::ContentVisibility> content_visibility() const;

    Optional<CSS::Cursor> cursor() const;

    Variant<LengthOrCalculated, NumberOrCalculated> tab_size() const;

    Optional<CSS::WhiteSpace> white_space() const;

    Optional<CSS::WordBreak> word_break() const;

    Optional<CSS::LengthOrCalculated> word_spacing() const;

    Optional<LengthOrCalculated> letter_spacing() const;

    Optional<CSS::LineStyle> line_style(CSS::PropertyID) const;

    Optional<CSS::OutlineStyle> outline_style() const;

    Vector<CSS::TextDecorationLine> text_decoration_line() const;

    Optional<CSS::TextDecorationStyle> text_decoration_style() const;

    Optional<CSS::TextTransform> text_transform() const;

    Vector<CSS::ShadowData> text_shadow(Layout::Node const&) const;

    Optional<CSS::ListStyleType> list_style_type() const;

    Optional<CSS::ListStylePosition> list_style_position() const;

    Optional<CSS::FlexDirection> flex_direction() const;

    Optional<CSS::FlexWrap> flex_wrap() const;

    Optional<CSS::FlexBasis> flex_basis() const;

    float flex_grow() const;

    float flex_shrink() const;

    int order() const;

    Optional<Color> accent_color(Layout::NodeWithStyle const&) const;

    Optional<CSS::AlignContent> align_content() const;

    Optional<CSS::AlignItems> align_items() const;

    Optional<CSS::AlignSelf> align_self() const;

    Optional<CSS::Appearance> appearance() const;

    CSS::Filter backdrop_filter() const;

    CSS::Filter filter() const;

    float opacity() const;

    Optional<CSS::Visibility> visibility() const;

    Optional<CSS::ImageRendering> image_rendering() const;

    Optional<CSS::JustifyContent> justify_content() const;

    Optional<CSS::JustifyItems> justify_items() const;

    Optional<CSS::JustifySelf> justify_self() const;

    Optional<CSS::Overflow> overflow_x() const;

    Optional<CSS::Overflow> overflow_y() const;

    Vector<CSS::ShadowData> box_shadow(Layout::Node const&) const;

    Optional<CSS::BoxSizing> box_sizing() const;

    Optional<CSS::PointerEvents> pointer_events() const;

    Variant<CSS::VerticalAlign, CSS::LengthPercentage> vertical_align() const;

    Optional<CSS::FontVariant> font_variant() const;

    Optional<FlyString> font_language_override() const;

    Optional<HashMap<FlyString, IntegerOrCalculated>> font_feature_settings() const;

    Optional<HashMap<FlyString, NumberOrCalculated>> font_variation_settings() const;

    CSS::GridTrackSizeList grid_auto_columns() const;

    CSS::GridTrackSizeList grid_auto_rows() const;

    CSS::GridTrackSizeList grid_template_columns() const;

    CSS::GridTrackSizeList grid_template_rows() const;

    [[nodiscard]] CSS::GridAutoFlow grid_auto_flow() const;

    CSS::GridTrackPlacement grid_column_end() const;

    CSS::GridTrackPlacement grid_column_start() const;

    CSS::GridTrackPlacement grid_row_end() const;

    CSS::GridTrackPlacement grid_row_start() const;

    Optional<CSS::BorderCollapse> border_collapse() const;

    Vector<Vector<String>> grid_template_areas() const;

    Optional<CSS::ObjectFit> object_fit() const;

    CSS::ObjectPosition object_position() const;

    Optional<CSS::TableLayout> table_layout() const;

    Optional<CSS::Direction> direction() const;

    Optional<CSS::UnicodeBidi> unicode_bidi() const;

    Optional<CSS::WritingMode> writing_mode() const;

    static Vector<CSS::Transformation> transformations_for_style_value(CSSStyleValue const& value);

    Vector<CSS::Transformation> transformations() const;

    Optional<CSS::TransformBox> transform_box() const;

    CSS::TransformOrigin transform_origin() const;

    Optional<CSS::Transformation> rotate(Layout::Node const&) const;

    Optional<CSS::MaskType> mask_type() const;

    Color stop_color() const;

    float stop_opacity() const;

    float fill_opacity() const;

    Optional<CSS::StrokeLinecap> stroke_linecap() const;

    Optional<CSS::StrokeLinejoin> stroke_linejoin() const;

    NumberOrCalculated stroke_miterlimit() const;

    float stroke_opacity() const;

    Optional<CSS::FillRule> fill_rule() const;

    Optional<CSS::ClipRule> clip_rule() const;

    Gfx::Font const& first_available_computed_font() const { return m_data->m_font_list->first(); }

    Gfx::FontCascadeList const& computed_font_list() const

    {

        VERIFY(m_data->m_font_list);

        return *m_data->m_font_list;

    }

    void set_computed_font_list(NonnullRefPtr<Gfx::FontCascadeList> font_list) const

    {

        m_data->m_font_list = move(font_list);

    }

    [[nodiscard]] CSSPixels compute_line_height(CSSPixelRect const& viewport_rect, Length::FontMetrics const& font_metrics, Length::FontMetrics const& root_font_metrics) const;

    [[nodiscard]] CSSPixels line_height() const { return *m_data->m_line_height; }

    void set_line_height(Badge<StyleComputer> const&, CSSPixels line_height) { m_data->m_line_height = line_height; }

    bool operator==(StyleProperties const&) const;

    Optional<CSS::Positioning> position() const;

    Optional<int> z_index() const;

    void set_math_depth(int math_depth);

    int math_depth() const { return m_data->m_math_depth; }

    QuotesData quotes() const;

    Vector<CounterData> counter_data(PropertyID) const;

    Optional<CSS::ScrollbarWidth> scrollbar_width() const;

    static NonnullRefPtr<Gfx::Font const> font_fallback(bool monospace, bool bold);

    static float resolve_opacity_value(CSSStyleValue const& value);

private:

    friend class StyleComputer;

    Optional<CSS::Overflow> overflow(CSS::PropertyID) const;

    Vector<CSS::ShadowData> shadow(CSS::PropertyID, Layout::Node const&) const;

    AK::CopyOnWrite<StyleProperties::Data> m_data;

};

}