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

/// ```
/// use css_style::{prelude::*, unit::em};
///
/// style()
///     .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<W, H> From<(W, H)> for Size
where
    W: Into<Length>,
    H: Into<Length>,
{
    fn from((w, h): (W, H)) -> Self {
        Self::default().width(w).height(h)
    }
}

impl Unit for Length {
    fn zero() -> Self {
        0.0.into()
    }

    fn half() -> Self {
        0.5.into()
    }

    fn full() -> Self {
        1.0.into()
    }
}

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

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

    pub fn zero(self) -> Self {
        self.width(Length::zero()).height(Length::zero())
    }

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

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

    pub fn auto(self) -> Self {
        self.width(Length::Auto).height(Length::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 {
    #[display(fmt = "auto")]
    Auto,
    #[display(fmt = "min-content")]
    MinContent,
    #[display(fmt = "max-content")]
    MaxContent,
    #[from]
    Length(unit::Length),
    #[from(forward)]
    Percent(Percent),
}

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