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use crate::{
    calc::Calc,
    css,
    unit::{self, *},
    Style, StyleUpdater,
};
use derive_rich::Rich;

/// ```
/// use css_style::{Style, unit::em};
///
/// Style::default()
///     .and_size(|conf| {
///         conf.width(em(2.))
///             .height(em(1.5))
///             .min_width(em(1.5))
///             .min_height(em(1.))
///             .max_width(em(4.))
///             .max_height(em(3.))
///     });
/// ```
#[derive(Rich, Clone, Debug, PartialEq, Default)]
pub struct Size {
    #[rich(write, write(option))]
    pub width: Option<Length>,
    #[rich(write, write(option))]
    pub min_width: Option<Length>,
    #[rich(write, write(option))]
    pub max_width: Option<Length>,
    #[rich(write, write(option))]
    pub height: Option<Length>,
    #[rich(write, write(option))]
    pub min_height: Option<Length>,
    #[rich(write, write(option))]
    pub max_height: Option<Length>,
}

impl StyleUpdater for Size {
    fn update_style(self, style: Style) -> Style {
        style
            .try_insert("width", self.width)
            .try_insert("min-width", self.min_width)
            .try_insert("max-width", self.max_width)
            .try_insert("height", self.height)
            .try_insert("min-height", self.min_height)
            .try_insert("max-height", self.max_height)
    }
}

impl From<Length> for Size {
    fn from(source: Length) -> Self {
        Self::default().all(source)
    }
}

impl From<unit::Length> for Size {
    fn from(source: unit::Length) -> Self {
        Self::default().all(source)
    }
}

impl From<Percent> for Size {
    fn from(source: Percent) -> Self {
        Self::default().all(source)
    }
}

impl From<f32> for Size {
    fn from(source: f32) -> Self {
        Self::default().all(source)
    }
}

impl Size {
    pub fn full(self) -> Self {
        self.width(1.0).height(1.0)
    }

    pub fn half(self) -> Self {
        self.width(0.5).height(0.5)
    }

    pub fn min_content(self) -> Self {
        self.width(css::MinContent).height(css::MinContent)
    }

    pub fn max_content(self) -> Self {
        self.width(css::MaxContent).height(css::MaxContent)
    }

    pub fn auto(self) -> Self {
        self.width(css::Auto).height(css::Auto)
    }

    pub fn resize(self, width: impl Into<Length>, height: impl Into<Length>) -> Self {
        self.width(width).height(height)
    }

    pub fn all(self, val: impl Into<Length>) -> Self {
        let val = val.into();
        self.all_widths(val.clone()).all_heights(val)
    }

    pub fn all_widths(self, width: impl Into<Length>) -> Self {
        let width = width.into();
        self.width(width.clone())
            .min_width(width.clone())
            .max_width(width)
    }

    pub fn all_heights(self, val: impl Into<Length>) -> Self {
        let val = val.into();
        self.height(val.clone())
            .min_height(val.clone())
            .max_height(val)
    }
}

// https://www.w3.org/TR/css-values-4/#lengths
#[derive(Clone, Debug, PartialEq, Display, From)]
pub enum Length {
    #[from]
    Auto(css::Auto),
    #[from]
    MinContent(css::MinContent),
    #[from]
    MaxContent(css::MaxContent),
    #[from]
    Length(unit::Length),
    #[from(forward)]
    Percent(Percent),
    Calc(Box<Calc<Self>>),
}

impl From<Calc<Self>> for Length {
    fn from(source: Calc<Self>) -> Self {
        Self::Calc(Box::new(source))
    }
}