use std::fmt::Display;

#[cfg(feature = "serde")]
use serde::{Deserialize, Serialize};

use super::super::SetAttr;

/// Represents an attribute.
///
/// # Platform-specific Notes
///
/// * Only UNIX and Windows 10 terminals do support text attributes.
/// * Keep in mind that not all terminals support all attributes.
/// * Crossterm implements almost all attributes listed in the
///   [SGR parameters](https://en.wikipedia.org/wiki/ANSI_escape_code#SGR_parameters).
///
/// | Attribute | Windows | UNIX | Notes |
/// | :-- | :--: | :--: | :-- |
/// | `Reset` | ✓ | ✓ | |
/// | `Bold` | ✓ | ✓ | |
/// | `Dim` | ✓ | ✓ | |
/// | `Italic` | ? | ? | Not widely supported, sometimes treated as inverse. |
/// | `Underlined` | ✓ | ✓ | |
/// | `SlowBlink` | ? | ? | Not widely supported, sometimes treated as inverse. |
/// | `RapidBlink` | ? | ? | Not widely supported. MS-DOS ANSI.SYS; 150+ per minute. |
/// | `Reverse` | ✓ | ✓ | |
/// | `Hidden` | ✓ | ✓ | Also known as Conceal. |
/// | `Fraktur` | ✗ | ✓ | Legible characters, but marked for deletion. |
/// | `DefaultForegroundColor` | ? | ? | Implementation specific (according to standard). |
/// | `DefaultBackgroundColor` | ? | ? | Implementation specific (according to standard). |
/// | `Framed` | ? | ? | Not widely supported. |
/// | `Encircled` | ? | ? | This should turn on the encircled attribute. |
/// | `OverLined` | ? | ? | This should draw a line at the top of the text. |
///
/// # Examples
///
/// Basic usage:
///
/// ```no_run
/// use crossterm::Attribute;
///
/// println!(
///     "{} Underlined {} No Underline",
///     Attribute::Underlined,
///     Attribute::NoUnderline
/// );
/// ```
///
/// Style existing text:
///
/// ```no_run
/// use crossterm::Styler;
///
/// println!("{}", "Bold text".bold());
/// println!("{}", "Underlined text".underlined());
/// println!("{}", "Negative text".negative());
/// ```
#[cfg_attr(feature = "serde", derive(Serialize, Deserialize))]
#[derive(Copy, Clone, Debug, PartialEq, Eq, Ord, PartialOrd, Hash)]
pub enum Attribute {
    /// Resets all the attributes.
    Reset = 0,
    /// Increases the text intensity.
    Bold = 1,
    /// Decreases the text intensity.
    Dim = 2,
    /// Emphasises the text.
    Italic = 3,
    /// Underlines the text.
    Underlined = 4,
    /// Makes the text blinking (< 150 per minute).
    SlowBlink = 5,
    /// Makes the text blinking (>= 150 per minute).
    RapidBlink = 6,
    /// Swaps foreground and background colors.
    Reverse = 7,
    /// Hides the text (also known as Conceal).
    Hidden = 8,
    /// Crosses the text.
    CrossedOut = 9,
    /// Sets the [Fraktur](https://en.wikipedia.org/wiki/Fraktur) typeface.
    ///
    /// Mostly used for [mathematical alphanumeric symbols](https://en.wikipedia.org/wiki/Mathematical_Alphanumeric_Symbols).
    Fraktur = 20,
    /// Turns off the `Bold` attribute.
    NoBold = 21,
    /// Switches the text back to normal intensity (no bold, italic).
    NormalIntensity = 22,
    /// Turns off the `Italic` attribute.
    NoItalic = 23,
    /// Turns off the `Underlined` attribute.
    NoUnderline = 24,
    /// Turns off the text blinking (`SlowBlink` or `RapidBlink`).
    NoBlink = 25,
    /// Turns off the `Reverse` attribute.
    NoInverse = 27, // TODO Shouldn't we rename this to `NoReverse`? Or `Reverse` to `Inverse`?
    /// Turns off the `Hidden` attribute.
    NoHidden = 28,
    /// Turns off the `CrossedOut` attribute.
    NotCrossedOut = 29,
    /// Makes the text framed.
    Framed = 51,
    /// Makes the text encircled.
    Encircled = 52,
    /// Draws a line at the top of the text.
    OverLined = 53,
    /// Turns off the `Frame` and `Encircled` attributes.
    NotFramedOrEncircled = 54,
    /// Turns off the `OverLined` attribute.
    NotOverLined = 55,

    #[doc(hidden)]
    __Nonexhaustive,
}

impl Display for Attribute {
    fn fmt(&self, f: &mut ::std::fmt::Formatter<'_>) -> std::result::Result<(), std::fmt::Error> {
        write!(f, "{}", SetAttr(*self))?;
        Ok(())
    }
}