/*
 * Copyright (c) 2018-2020, Andreas Kling <andreas@ladybird.org>
 *
 * SPDX-License-Identifier: BSD-2-Clause
 */

#pragma once

#include <LibGC/Ptr.h>
#include <LibGfx/Rect.h>
#include <LibGfx/TextLayout.h>
#include <LibWeb/CSS/Enums.h>
#include <LibWeb/PixelUnits.h>

namespace Web::Layout {

class LineBoxFragment {
    friend class LineBox;

public:
    LineBoxFragment(Node const& layout_node, size_t start, size_t length, CSSPixels inline_offset, CSSPixels block_offset, CSSPixels inline_length, CSSPixels block_length, CSSPixels border_box_top, CSS::Direction, CSS::WritingMode, RefPtr<Gfx::GlyphRun>);

    Node const& layout_node() const { return m_layout_node; }
    size_t start() const { return m_start; }
    size_t length_in_code_units() const { return m_length_in_code_units; }

    CSSPixelPoint offset() const;
    CSSPixels inline_offset() const { return m_inline_offset; }
    CSSPixels block_offset() const { return m_block_offset; }
    void set_inline_offset(CSSPixels inline_offset) { m_inline_offset = inline_offset; }
    void set_block_offset(CSSPixels block_offset) { m_block_offset = block_offset; }

    // The baseline of a fragment is the number of pixels from the top to the text baseline.
    void set_baseline(CSSPixels y) { m_baseline = y; }
    CSSPixels baseline() const { return m_baseline; }

    CSSPixelSize size() const;
    CSSPixels width() const { return size().width(); }
    CSSPixels height() const { return size().height(); }
    CSSPixels inline_length() const { return m_inline_length; }
    CSSPixels block_length() const { return m_block_length; }
    void set_inline_length(CSSPixels inline_length) { m_inline_length = inline_length; }
    void set_block_length(CSSPixels block_length) { m_block_length = block_length; }

    CSSPixels border_box_top() const { return m_border_box_top; }

    bool ends_in_whitespace() const;
    bool is_justifiable_whitespace() const;
    Utf16View text() const;

    bool is_atomic_inline() const;

    RefPtr<Gfx::GlyphRun> glyph_run() const { return m_glyph_run; }
    CSS::WritingMode writing_mode() const { return m_writing_mode; }
    void append_glyph_run(RefPtr<Gfx::GlyphRun> const&, CSSPixels run_width);

    bool has_trailing_whitespace() const { return m_has_trailing_whitespace; }
    void set_has_trailing_whitespace(bool value) { m_has_trailing_whitespace = value; }

    bool is_fully_truncated() const { return m_is_fully_truncated; }
    void set_fully_truncated(bool value) { m_is_fully_truncated = value; }

private:
    CSS::Direction resolve_glyph_run_direction(Gfx::GlyphRun::TextType) const;
    void append_glyph_run_ltr(RefPtr<Gfx::GlyphRun> const&, CSSPixels run_width);
    void append_glyph_run_rtl(RefPtr<Gfx::GlyphRun> const&, CSSPixels run_width);

    GC::Ref<Node const> m_layout_node;
    size_t m_start { 0 };
    size_t m_length_in_code_units { 0 };
    CSSPixels m_inline_offset;
    CSSPixels m_block_offset;
    CSSPixels m_inline_length;
    CSSPixels m_block_length;
    CSSPixels m_border_box_top { 0 };
    CSSPixels m_baseline { 0 };
    CSS::Direction m_direction { CSS::Direction::Ltr };
    CSS::WritingMode m_writing_mode { CSS::WritingMode::HorizontalTb };

    RefPtr<Gfx::GlyphRun> m_glyph_run;
    float m_insert_position { 0 };
    CSS::Direction m_current_insert_direction { CSS::Direction::Ltr };
    bool m_has_trailing_whitespace { false };
    bool m_is_fully_truncated { false };
};

}