mod background_image;

use std::sync::Arc;

use background_image::BackgroundImage;

use crate::gradient::{self, Gradient};
use crate::image::{FilterMethod, Handle};
use crate::{Color, Image, Point, Rectangle, Size, image};

/// The background of some element.
#[derive(Debug, Clone, PartialEq)]
pub enum Background {
    /// A solid color.
    Color(Color),
    /// Linearly interpolate between several colors.
    Gradient(Gradient),
    /// A background image.
    Image(BackgroundImage),
}

impl Background {
    /// Scales the alpha channel of the [`Background`] by the given
    /// factor.
    pub fn scale_alpha(self, factor: f32) -> Self {
        match self {
            Self::Color(color) => Self::Color(color.scale_alpha(factor)),
            Self::Gradient(gradient) => {
                Self::Gradient(gradient.scale_alpha(factor))
            }
            Self::Image(background_image) => {
                Self::Image(background_image.scale_opacity(factor))
            }
        }
    }
}

impl From<Color> for Background {
    fn from(color: Color) -> Self {
        Background::Color(color)
    }
}

impl From<Gradient> for Background {
    fn from(gradient: Gradient) -> Self {
        Background::Gradient(gradient)
    }
}

impl From<gradient::Linear> for Background {
    fn from(gradient: gradient::Linear) -> Self {
        Background::Gradient(Gradient::Linear(gradient))
    }
}

impl From<BackgroundImage> for Background {
    fn from(background_image: BackgroundImage) -> Self {
        Background::Image(background_image)
    }
}