#[derive(Debug, Clone, Copy, PartialEq)]
pub struct Color {
    pub r: f64,
    pub g: f64,
    pub b: f64,
}

impl Color {
    pub fn rgb(r: f64, g: f64, b: f64) -> Self {
        Self { r, g, b }
    }

    pub fn parse(c: &str) -> Option<Self> {
        match c {
            "red" => Some(Color::RED),
            "green" => Some(Color::GREEN),
            "blue" => Some(Color::BLUE),
            "yellow" => Some(Color::YELLOW),
            "cyan" => Some(Color::CYAN),
            "magenta" => Some(Color::MAGENTA),
            "black" => Some(Color::BLACK),
            "white" => Some(Color::WHITE),
            _ => {
                if c.len() == 6 {
                    Some(Self::from_rgb888(
                        u8::from_str_radix(&c[0..2], 16).ok()?,
                        u8::from_str_radix(&c[2..4], 16).ok()?,
                        u8::from_str_radix(&c[4..6], 16).ok()?,
                    ))
                } else {
                    None
                }
            }
        }
    }

    pub fn as_rgb888(&self) -> (u8, u8, u8) {
        (
            (self.r * 255.0) as u8,
            (self.g * 255.0) as u8,
            (self.b * 255.0) as u8,
        )
    }
    pub fn from_rgb888(r: u8, g: u8, b: u8) -> Self {
        Color {
            r: r as f64 / 255.0,
            g: g as f64 / 255.0,
            b: b as f64 / 255.0,
        }
    }
    pub const RED: Color = Color {
        r: 1.0,
        g: 0.0,
        b: 0.0,
    };
    pub const GREEN: Color = Color {
        r: 0.0,
        g: 1.0,
        b: 0.0,
    };
    pub const BLUE: Color = Color {
        r: 0.0,
        g: 0.0,
        b: 1.0,
    };
    pub const YELLOW: Color = Color {
        r: 1.0,
        g: 1.0,
        b: 0.0,
    };
    pub const CYAN: Color = Color {
        r: 0.0,
        g: 1.0,
        b: 1.0,
    };
    pub const MAGENTA: Color = Color {
        r: 1.0,
        g: 0.0,
        b: 1.0,
    };

    pub const BLACK: Color = Color {
        r: 0.0,
        g: 0.0,
        b: 0.0,
    };
    pub const WHITE: Color = Color {
        r: 1.0,
        g: 1.0,
        b: 1.0,
    };

    pub fn mix(a: Color, b: Color, x: f64) -> Color {
        let y = 1.0 - x;
        Color {
            r: a.r * y + b.r * x,
            g: a.g * y + b.g * x,
            b: a.b * y + b.b * x,
        }
    }
}