//! `TextBox` styling.
//! ==================
//!
//! To construct a `TextBox` object at least a text string, a bounding box and character style are
//! required. For advanced formatting options an additional `TextBoxStyle` object might be used.
//!
//! Text rendering in `embedded-graphics` is designed to be extendable by text renderers for
//! different font formats. `embedded-text` follows this philosophy by using the same text renderer
//! infrastructure. To use a text renderer in an `embedded-text` project each renderer provides a
//! character style object. See the [`embedded-graphics` documentation] for more information.
//!
//! TextBox style
//! ---------------
//!
//! In addition to styling the individual characters the [`TextBox`] drawable also contains a
//! [`TextBoxStyle`] setting. The text box style is used to set the horizontal and vertical
//! alignment, line and paragraph spacing, tab size and some other advanced settings of text box
//! objects.
//!
//! The [`alignment`] option sets the horizontal alignment of the text.
//! **Note: alignment works differently from `embedded-graphics`.**
//! With the default value `Left` the start of each line will be lined up with the left side of the
//! bounding box. Similarly `Right` aligned text will line up the ends of the lines with the right
//! side of the bounding box. `Center`ed text will be positioned at equal distance from the left and
//! right sides. `Justified` text will distribute the text in such a way that both the start and end
//! of a line will align with the respective sides of the bounding box.
//!
//! The [`vertical_alignment`] setting sets the vertical alignment of the text.
//! With the default value `Top` the top of the text is lined up with the top of the bounding box.
//! Similarly `Bottom` aligned text will line up the bottom of the last line of the text with the
//! bottom edge of the bounding box. `Middle` aligned text will be positioned at equal distance from
//! the top and bottom sides.
//!
//! The [`line_height`] option sets the distance between the baselines of the lines of text. It can
//! be specified in either pixels or percentage of the line height defined by the font.
//!
//! The [`paragraph_spacing`] setting sets the distance between paragraphs of text, in addition to
//! the line spacing.
//!
//! The [`tab_size`] setting sets the maximum width of a tab character. It can be specified in
//! either pixels of number of space characters.
//!
//! Advanced settings
//! -----------------
//!
//! The [`height_mode`] setting determines how the `TextBox` adjusts its height to its contents.
//! The default value [`Exact`] does not adjust the height - the text box will be as tall as the
//! bounding box given to it. [`FitToText`] will adjust the height to the height of the text,
//! regardless of the initial bounding box's height. [`ShrinkToText`] will decrease the height
//! of the text box to the height of the text, if the bounding box given to the text box is too
//! tall.
//!
//! `Exact` and `ShrinkToText` have an additional [`VerticalOverdraw`] parameter. This setting
//! specifies how the text outside of the adjusted bounding box is handled. [`Visible`] renders the
//! text regardless of the bounding box. [`Hidden`] renders everything inside the bounding box. If a
//! line is too tall to fit inside the bounding box, it will be drawn partially, the bottom part of
//! the text clipped. [`FullRowsOnly`] only renders lines that are completely inside the bounding
//! box.
//!
//! For examples on how to use height mode settings, see the documentation of [`HeightMode`].
//!
//! The [`leading_spaces`] and [`trailing_spaces`] settings set whether the spaces at the beginning
//! or the end of a line are visible. The default values depend on the [`alignment`] setting.
//!
//! | `alignment`  | `leading_spaces` | `trailing_spaces` |
//! | ------------ | ---------------- | ----------------- |
//! | `Left`       | `true`           | `false`           |
//! | `Right`      | `false`          | `false`           |
//! | `Center`     | `false`          | `false`           |
//! | `Justified`  | `false`          | `false`           |
//!
//! # Ways to create and apply text box styles
//!
//! ## Example 1: Setting multiple options using the [`TextBoxStyleBuilder`] object:
//!
//! To build more complex styles, you can use the [`TextBoxStyleBuilder`] object and the
//! [`TextBox::with_textbox_style`] constructor.
//!
//! ```rust
//! # use embedded_graphics::{
//! #     mono_font::{ascii::FONT_6X9, MonoTextStyle},
//! #     pixelcolor::BinaryColor,
//! #     prelude::*,
//! #     primitives::Rectangle,
//! # };
//! # let character_style = MonoTextStyle::new(&FONT_6X9, BinaryColor::On);
//! # let bounding_box = Rectangle::new(Point::zero(), Size::new(60, 10));
//! # let text = "";
//! #
//! use embedded_text::{
//!     TextBox,
//!     style::TextBoxStyleBuilder,
//!     alignment::{
//!         HorizontalAlignment,
//!         VerticalAlignment,
//!     },
//! };
//!
//! let textbox_style = TextBoxStyleBuilder::new()
//!     .alignment(HorizontalAlignment::Center)
//!     .vertical_alignment(VerticalAlignment::Middle)
//!     .build();
//!
//! let textbox = TextBox::with_textbox_style(
//!     text,
//!     bounding_box,
//!     character_style,
//!     textbox_style,
//! );
//! ```
//!
//! [`TextBox::with_textbox_style`]: crate::TextBox::with_textbox_style
//!
//! ## Examples 2 and 3: Only setting a single option:
//!
//! Both the [`TextBox`] and [`TextBoxStyle`] objects have different constructor methods in case you
//! only want to set a single style option.
//!
//! ```rust
//! # use embedded_graphics::{
//! #     mono_font::{ascii::FONT_6X9, MonoTextStyle},
//! #     pixelcolor::BinaryColor,
//! #     prelude::*,
//! #     primitives::Rectangle,
//! # };
//! # let character_style = MonoTextStyle::new(&FONT_6X9, BinaryColor::On);
//! # let bounding_box = Rectangle::new(Point::zero(), Size::new(60, 10));
//! # let text = "";
//! #
//! use embedded_text::{TextBox, alignment::HorizontalAlignment};
//!
//! let textbox = TextBox::with_alignment(
//!     text,
//!     bounding_box,
//!     character_style,
//!     HorizontalAlignment::Center,
//! );
//! ```
//!
//! ```rust
//! # use embedded_graphics::{
//! #     mono_font::{ascii::FONT_6X9, MonoTextStyle},
//! #     pixelcolor::BinaryColor,
//! #     prelude::*,
//! #     primitives::Rectangle,
//! # };
//! # let character_style = MonoTextStyle::new(&FONT_6X9, BinaryColor::On);
//! # let bounding_box = Rectangle::new(Point::zero(), Size::new(60, 10));
//! # let text = "";
//! #
//! use embedded_text::{TextBox, style::TextBoxStyle, alignment::VerticalAlignment};
//!
//! let textbox_style = TextBoxStyle::with_vertical_alignment(VerticalAlignment::Middle);
//!
//! let textbox = TextBox::with_textbox_style(
//!     text,
//!     bounding_box,
//!     character_style,
//!     textbox_style,
//! );
//! ```
//!
//! [`TextBox`]: crate::TextBox
//! [`alignment`]: TextBoxStyle::alignment
//! [`vertical_alignment`]: TextBoxStyle::vertical_alignment
//! [`line_height`]: TextBoxStyle::line_height
//! [`paragraph_spacing`]: TextBoxStyle::paragraph_spacing
//! [`tab_size`]: TextBoxStyle::tab_size
//! [`height_mode`]: TextBoxStyle::height_mode
//! [`leading_spaces`]: TextBoxStyle::leading_spaces
//! [`trailing_spaces`]: TextBoxStyle::trailing_spaces
//! [`Exact`]: HeightMode::Exact
//! [`FitToText`]: HeightMode::FitToText
//! [`ShrinkToText`]: HeightMode::ShrinkToText
//! [`Visible`]: VerticalOverdraw::Visible
//! [`Hidden`]: VerticalOverdraw::Hidden
//! [`FullRowsOnly`]: VerticalOverdraw::FullRowsOnly
//! [`embedded-graphics` documentation]: https://docs.rs/embedded-graphics/0.7.1/embedded_graphics/text/index.html

mod builder;
mod height_mode;
mod vertical_overdraw;

use core::convert::Infallible;

use crate::{
    alignment::{HorizontalAlignment, VerticalAlignment},
    parser::Parser,
    plugin::{NoPlugin, PluginMarker as Plugin, PluginWrapper, ProcessingState},
    rendering::{
        cursor::LineCursor,
        line_iter::{ElementHandler, LineElementParser, LineEndType},
        space_config::SpaceConfig,
    },
    utils::str_width,
};
use az::SaturatingAs;
use embedded_graphics::{
    pixelcolor::Rgb888,
    text::{renderer::TextRenderer, LineHeight},
};

pub use self::{
    builder::TextBoxStyleBuilder, height_mode::HeightMode, vertical_overdraw::VerticalOverdraw,
};

/// Tab size helper
///
/// This type makes it more obvious what unit is used to define the width of tabs.
/// The default tab size is 4 spaces.
#[derive(Copy, Clone, Debug, Hash, PartialEq, Eq, PartialOrd, Ord)]
pub enum TabSize {
    /// Tab width as a number of pixels.
    Pixels(u16),

    /// Tab width as a number of space characters.
    Spaces(u16),
}

impl TabSize {
    /// Returns the default tab size, which is 4 spaces.
    #[inline]
    pub const fn default() -> Self {
        Self::Spaces(4)
    }

    /// Calculate the rendered with of the next tab
    #[inline]
    pub(crate) fn into_pixels(self, renderer: &impl TextRenderer) -> u32 {
        match self {
            TabSize::Pixels(px) => px as u32,
            TabSize::Spaces(n) => n as u32 * str_width(renderer, " "),
        }
    }
}

/// Styling options of a [`TextBox`].
///
/// `TextBoxStyle` contains the font, foreground and background `PixelColor`, line spacing,
/// [`HeightMode`], [`HorizontalAlignment`] and [`VerticalAlignment`] information necessary
/// to draw a [`TextBox`].
///
/// To construct a new `TextBoxStyle` object, use the [`TextBoxStyle::default`] method or
/// the [`TextBoxStyleBuilder`] object.
///
/// [`TextBox`]: crate::TextBox
#[derive(Copy, Clone, Eq, PartialEq, Hash, Debug)]
#[non_exhaustive]
#[must_use]
pub struct TextBoxStyle {
    /// Horizontal text alignment.
    pub alignment: HorizontalAlignment,

    /// Vertical text alignment.
    pub vertical_alignment: VerticalAlignment,

    /// The height behaviour.
    pub height_mode: HeightMode,

    /// Line height.
    pub line_height: LineHeight,

    /// Paragraph spacing.
    pub paragraph_spacing: u32,

    /// Desired column width for tabs
    pub tab_size: TabSize,

    /// True to render leading spaces
    pub leading_spaces: bool,

    /// True to render trailing spaces
    pub trailing_spaces: bool,
}

impl TextBoxStyle {
    /// Creates a new text box style object with default settings.
    #[inline]
    pub const fn default() -> Self {
        TextBoxStyleBuilder::new().build()
    }

    /// Creates a new text box style with the given alignment.
    #[inline]
    pub const fn with_alignment(alignment: HorizontalAlignment) -> TextBoxStyle {
        TextBoxStyleBuilder::new().alignment(alignment).build()
    }

    /// Creates a new text box style with the given vertical alignment.
    #[inline]
    pub const fn with_vertical_alignment(alignment: VerticalAlignment) -> TextBoxStyle {
        TextBoxStyleBuilder::new()
            .vertical_alignment(alignment)
            .build()
    }

    /// Creates a new text box style with the given [height mode].
    ///
    /// [height mode]: HeightMode
    #[inline]
    pub const fn with_height_mode(mode: HeightMode) -> TextBoxStyle {
        TextBoxStyleBuilder::new().height_mode(mode).build()
    }

    /// Creates a new text box style with the given line height.
    #[inline]
    pub const fn with_line_height(line_height: LineHeight) -> TextBoxStyle {
        TextBoxStyleBuilder::new().line_height(line_height).build()
    }

    /// Creates a new text box style with the given paragraph spacing.
    #[inline]
    pub const fn with_paragraph_spacing(spacing: u32) -> TextBoxStyle {
        TextBoxStyleBuilder::new()
            .paragraph_spacing(spacing)
            .build()
    }

    /// Creates a new text box style with the given tab size.
    #[inline]
    pub const fn with_tab_size(tab_size: TabSize) -> TextBoxStyle {
        TextBoxStyleBuilder::new().tab_size(tab_size).build()
    }
}

/// Information about a line.
#[derive(Debug, Copy, Clone)]
#[must_use]
pub(crate) struct LineMeasurement {
    /// Maximum line width in pixels.
    pub max_line_width: u32,

    /// Width in pixels, using the default space width returned by the text renderer.
    pub width: u32,

    /// What kind of line ending was encountered.
    pub line_end_type: LineEndType,

    /// Number of spaces in the current line.
    pub space_count: u32,
}

impl LineMeasurement {
    pub fn last_line(&self) -> bool {
        matches!(
            self.line_end_type,
            LineEndType::NewLine | LineEndType::EndOfText
        )
    }

    pub fn is_empty(&self) -> bool {
        self.width == 0
    }
}

struct MeasureLineElementHandler<'a, S> {
    style: &'a S,
    trailing_spaces: bool,
    max_line_width: u32,
    cursor: u32,
    pos: u32,
    right: u32,
    partial_space_count: u32,
    space_count: u32,
}

impl<'a, S> MeasureLineElementHandler<'a, S> {
    fn space_count(&self) -> u32 {
        if self.trailing_spaces {
            self.partial_space_count
        } else {
            self.space_count
        }
    }

    fn right(&self) -> u32 {
        if self.trailing_spaces {
            self.pos
        } else {
            self.right
        }
    }
}

impl<'a, S: TextRenderer> ElementHandler for MeasureLineElementHandler<'a, S> {
    type Error = Infallible;
    type Color = S::Color;

    fn measure(&self, st: &str) -> u32 {
        str_width(self.style, st)
    }

    fn whitespace(&mut self, _st: &str, count: u32, width: u32) -> Result<(), Self::Error> {
        self.cursor += width;
        self.pos = self.pos.max(self.cursor);
        self.partial_space_count += count;

        Ok(())
    }

    fn printed_characters(&mut self, str: &str, width: Option<u32>) -> Result<(), Self::Error> {
        self.cursor += width.unwrap_or_else(|| self.measure(str));
        self.pos = self.pos.max(self.cursor);
        self.right = self.pos;
        self.space_count = self.partial_space_count;

        Ok(())
    }

    fn move_cursor(&mut self, by: i32) -> Result<(), Self::Error> {
        self.cursor = (self.cursor.saturating_as::<i32>() + by)
            .clamp(0, self.max_line_width.saturating_as()) as u32;

        Ok(())
    }
}

impl TextBoxStyle {
    /// Measure the width and count spaces in a single line of text.
    ///
    /// Returns (width, rendered space count, carried token)
    ///
    /// Instead of peeking ahead when processing tokens, this function advances the parser before
    /// processing a token. If a token opens a new line, it will be returned as the carried token.
    /// If the carried token is `None`, the parser has finished processing the text.
    #[inline]
    pub(crate) fn measure_line<'a, S, M>(
        &self,
        plugin: &PluginWrapper<'a, M, S::Color>,
        character_style: &S,
        parser: &mut Parser<'a, S::Color>,
        max_line_width: u32,
    ) -> LineMeasurement
    where
        S: TextRenderer,
        M: Plugin<'a, S::Color>,
        S::Color: From<Rgb888>,
    {
        let cursor = LineCursor::new(max_line_width, self.tab_size.into_pixels(character_style));

        let mut iter = LineElementParser::new(
            parser,
            plugin,
            cursor,
            SpaceConfig::new(str_width(character_style, " "), None),
            self,
        );

        let mut handler = MeasureLineElementHandler {
            style: character_style,
            trailing_spaces: self.trailing_spaces,
            max_line_width,

            cursor: 0,
            pos: 0,
            right: 0,
            partial_space_count: 0,
            space_count: 0,
        };
        let last_token = iter.process(&mut handler).unwrap();

        LineMeasurement {
            max_line_width,
            width: handler.right(),
            space_count: handler.space_count(),
            line_end_type: last_token,
        }
    }

    /// Measures text height when rendered using a given width.
    ///
    /// # Example: measure height of text when rendered using a 6x9 MonoFont and 72px width.
    ///
    /// ```rust
    /// # use embedded_text::style::TextBoxStyleBuilder;
    /// # use embedded_graphics::{
    /// #     mono_font::{ascii::FONT_6X9, MonoTextStyleBuilder},
    /// #     pixelcolor::BinaryColor,
    /// # };
    /// #
    /// let character_style = MonoTextStyleBuilder::new()
    ///     .font(&FONT_6X9)
    ///     .text_color(BinaryColor::On)
    ///     .build();
    /// let style = TextBoxStyleBuilder::new().build();
    ///
    /// let height = style.measure_text_height(
    ///     &character_style,
    ///     "Lorem Ipsum is simply dummy text of the printing and typesetting industry.",
    ///     72,
    /// );
    ///
    /// // Expect 7 lines of text, wrapped in something like the following:
    ///
    /// // |Lorem Ipsum |
    /// // |is simply   |
    /// // |dummy text  |
    /// // |of the      |
    /// // |printing and|
    /// // |typesetting |
    /// // |industry.   |
    ///
    /// assert_eq!(7 * 9, height);
    /// ```
    #[inline]
    #[must_use]
    pub fn measure_text_height<S>(&self, character_style: &S, text: &str, max_width: u32) -> u32
    where
        S: TextRenderer,
        S::Color: From<Rgb888>,
    {
        let plugin = PluginWrapper::new(NoPlugin::new());
        self.measure_text_height_impl(plugin, character_style, text, max_width)
    }

    pub(crate) fn measure_text_height_impl<'a, S, M>(
        &self,
        plugin: PluginWrapper<'a, M, S::Color>,
        character_style: &S,
        text: &'a str,
        max_width: u32,
    ) -> u32
    where
        S: TextRenderer,
        M: Plugin<'a, S::Color>,
        S::Color: From<Rgb888>,
    {
        let mut parser = Parser::parse(text);
        let base_line_height = character_style.line_height();
        let line_height = self.line_height.to_absolute(base_line_height);
        let mut height = base_line_height;

        plugin.set_state(ProcessingState::Measure);

        let mut prev_end = LineEndType::EndOfText;

        loop {
            plugin.new_line();
            let lm = self.measure_line(&plugin, character_style, &mut parser, max_width);

            if prev_end == LineEndType::LineBreak && !lm.is_empty() {
                height += line_height;
            }

            match lm.line_end_type {
                LineEndType::CarriageReturn | LineEndType::LineBreak => {}
                LineEndType::NewLine => height += line_height + self.paragraph_spacing,
                LineEndType::EndOfText => return height,
            }
            prev_end = lm.line_end_type;
        }
    }
}

#[cfg(test)]
mod test {
    use crate::{
        alignment::*,
        parser::Parser,
        plugin::{NoPlugin, PluginWrapper},
        style::{builder::TextBoxStyleBuilder, TextBoxStyle},
    };
    use embedded_graphics::{
        mono_font::{ascii::FONT_6X9, MonoTextStyleBuilder},
        pixelcolor::BinaryColor,
        text::{renderer::TextRenderer, LineHeight},
    };

    #[test]
    fn no_infinite_loop() {
        let character_style = MonoTextStyleBuilder::new()
            .font(&FONT_6X9)
            .text_color(BinaryColor::On)
            .build();

        let _ = TextBoxStyleBuilder::new()
            .build()
            .measure_text_height(&character_style, "a", 5);
    }

    #[test]
    fn test_measure_height() {
        let data = [
            // (text; max width in characters; number of expected lines)
            ("", 0, 1),
            (" ", 6, 1),
            ("\r", 6, 1),
            ("\n", 6, 2),
            ("\n ", 6, 2),
            ("word", 4 * 6, 1),   // exact fit into 1 line
            ("word\n", 4 * 6, 2), // newline
            ("word", 4 * 6 - 1, 2),
            ("word", 2 * 6, 2),      // exact fit into 2 lines
            ("word word", 4 * 6, 2), // exact fit into 2 lines
            ("word\n", 2 * 6, 3),
            ("word\nnext", 50, 2),
            ("word\n\nnext", 50, 3),
            ("word\n  \nnext", 50, 3),
            ("verylongword", 50, 2),
            ("some verylongword", 50, 3),
            ("1 23456 12345 61234 561", 36, 5),
            ("    Word      ", 36, 2),
            ("\rcr", 36, 1),
            ("cr\r", 36, 1),
            ("cr\rcr", 36, 1),
            ("Longer\r", 36, 1),
            ("Longer\rnowrap", 36, 1),
        ];

        let character_style = MonoTextStyleBuilder::new()
            .font(&FONT_6X9)
            .text_color(BinaryColor::On)
            .build();

        let style = TextBoxStyle::with_paragraph_spacing(2);

        for (i, (text, width, expected_n_lines)) in data.iter().enumerate() {
            let height = style.measure_text_height(&character_style, text, *width);
            let expected_height = *expected_n_lines * character_style.line_height()
                + (text.chars().filter(|&c| c == '\n').count() as u32) * style.paragraph_spacing;
            assert_eq!(
                height,
                expected_height,
                r#"#{}: Height of {:?} is {} but is expected to be {}"#,
                i,
                text.replace('\r', "\\r").replace('\n', "\\n"),
                height,
                expected_height
            );
        }
    }

    #[test]
    fn test_measure_height_ignored_spaces() {
        let data = [
            ("", 0, 1),
            (" ", 0, 1),
            (" ", 6, 1),
            ("\n ", 6, 2),
            ("word\n  \nnext", 50, 3),
            ("    Word      ", 36, 1),
        ];

        let character_style = MonoTextStyleBuilder::new()
            .font(&FONT_6X9)
            .text_color(BinaryColor::On)
            .build();

        let style = TextBoxStyleBuilder::new()
            .alignment(HorizontalAlignment::Center)
            .build();

        for (i, (text, width, expected_n_lines)) in data.iter().enumerate() {
            let height = style.measure_text_height(&character_style, text, *width);
            let expected_height = *expected_n_lines * character_style.line_height();
            assert_eq!(
                height, expected_height,
                r#"#{}: Height of "{}" is {} but is expected to be {}"#,
                i, text, height, expected_height
            );
        }
    }

    #[test]
    fn test_measure_line() {
        let character_style = MonoTextStyleBuilder::new()
            .font(&FONT_6X9)
            .text_color(BinaryColor::On)
            .build();

        let style = TextBoxStyleBuilder::new()
            .alignment(HorizontalAlignment::Center)
            .build();

        let mut text = Parser::parse("123 45 67");

        let mut plugin = PluginWrapper::new(NoPlugin::new());
        let lm = style.measure_line(
            &mut plugin,
            &character_style,
            &mut text,
            6 * FONT_6X9.character_size.width,
        );
        assert_eq!(lm.width, 6 * FONT_6X9.character_size.width);
    }

    #[test]
    fn test_measure_line_counts_nbsp() {
        let character_style = MonoTextStyleBuilder::new()
            .font(&FONT_6X9)
            .text_color(BinaryColor::On)
            .build();

        let style = TextBoxStyleBuilder::new()
            .alignment(HorizontalAlignment::Center)
            .build();

        let mut text = Parser::parse("123\u{A0}45");

        let mut plugin = PluginWrapper::new(NoPlugin::new());
        let lm = style.measure_line(
            &mut plugin,
            &character_style,
            &mut text,
            5 * FONT_6X9.character_size.width,
        );
        assert_eq!(lm.width, 5 * FONT_6X9.character_size.width);
    }

    #[test]
    fn test_measure_height_nbsp() {
        let character_style = MonoTextStyleBuilder::new()
            .font(&FONT_6X9)
            .text_color(BinaryColor::On)
            .build();

        let style = TextBoxStyleBuilder::new()
            .alignment(HorizontalAlignment::Center)
            .build();
        let text = "123\u{A0}45 123";

        let height =
            style.measure_text_height(&character_style, text, 5 * FONT_6X9.character_size.width);
        assert_eq!(height, 2 * character_style.line_height());

        // bug discovered while using the interactive example
        let style = TextBoxStyleBuilder::new()
            .alignment(HorizontalAlignment::Left)
            .build();

        let text = "embedded-text also\u{A0}supports non-breaking spaces.";

        let height = style.measure_text_height(&character_style, text, 79);
        assert_eq!(height, 4 * character_style.line_height());
    }

    #[test]
    fn height_with_line_spacing() {
        let character_style = MonoTextStyleBuilder::new()
            .font(&FONT_6X9)
            .text_color(BinaryColor::On)
            .build();

        let style = TextBoxStyleBuilder::new()
            .line_height(LineHeight::Pixels(11))
            .build();

        let height = style.measure_text_height(
            &character_style,
            "Lorem Ipsum is simply dummy text of the printing and typesetting industry.",
            72,
        );

        assert_eq!(height, 6 * 11 + 9);
    }

    #[test]
    fn soft_hyphenated_line_width_includes_hyphen_width() {
        let character_style = MonoTextStyleBuilder::new()
            .font(&FONT_6X9)
            .text_color(BinaryColor::On)
            .build();

        let style = TextBoxStyleBuilder::new()
            .line_height(LineHeight::Pixels(11))
            .build();

        let mut plugin = PluginWrapper::new(NoPlugin::new());
        let lm = style.measure_line(
            &mut plugin,
            &character_style,
            &mut Parser::parse("soft\u{AD}hyphen"),
            50,
        );

        assert_eq!(lm.width, 30);
    }
}