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/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at https://mozilla.org/MPL/2.0/. */

//! Generic values for properties related to animations and transitions.

use crate::values::generics::length::GenericLengthPercentageOrAuto;
use crate::values::specified::animation::{ScrollAxis, ScrollFunction};
use crate::values::TimelineName;
use std::fmt::{self, Write};
use style_traits::{CssWriter, ToCss};

/// The view() notation.
/// https://drafts.csswg.org/scroll-animations-1/#view-notation
#[derive(
    Clone,
    Debug,
    MallocSizeOf,
    PartialEq,
    SpecifiedValueInfo,
    ToComputedValue,
    ToCss,
    ToResolvedValue,
    ToShmem,
)]
#[css(function = "view")]
#[repr(C)]
pub struct GenericViewFunction<LengthPercent> {
    /// The axis of scrolling that drives the progress of the timeline.
    #[css(skip_if = "ScrollAxis::is_default")]
    pub axis: ScrollAxis,
    /// An adjustment of the view progress visibility range.
    #[css(skip_if = "GenericViewTimelineInset::is_auto")]
    #[css(field_bound)]
    pub inset: GenericViewTimelineInset<LengthPercent>,
}

pub use self::GenericViewFunction as ViewFunction;

/// A value for the <single-animation-timeline>.
///
/// https://drafts.csswg.org/css-animations-2/#typedef-single-animation-timeline
#[derive(
    Clone,
    Debug,
    MallocSizeOf,
    PartialEq,
    SpecifiedValueInfo,
    ToComputedValue,
    ToCss,
    ToResolvedValue,
    ToShmem,
)]
#[repr(C, u8)]
pub enum GenericAnimationTimeline<LengthPercent> {
    /// Use default timeline. The animation’s timeline is a DocumentTimeline.
    Auto,
    /// The scroll-timeline name or view-timeline-name.
    /// https://drafts.csswg.org/scroll-animations-1/#scroll-timelines-named
    /// https://drafts.csswg.org/scroll-animations-1/#view-timeline-name
    Timeline(TimelineName),
    /// The scroll() notation.
    /// https://drafts.csswg.org/scroll-animations-1/#scroll-notation
    Scroll(ScrollFunction),
    /// The view() notation.
    /// https://drafts.csswg.org/scroll-animations-1/#view-notation
    View(#[css(field_bound)] GenericViewFunction<LengthPercent>),
}

pub use self::GenericAnimationTimeline as AnimationTimeline;

impl<LengthPercent> AnimationTimeline<LengthPercent> {
    /// Returns the `auto` value.
    pub fn auto() -> Self {
        Self::Auto
    }

    /// Returns true if it is auto (i.e. the default value).
    pub fn is_auto(&self) -> bool {
        matches!(self, Self::Auto)
    }
}

/// A generic value for the `[ [ auto | <length-percentage> ]{1,2} ]`.
///
/// https://drafts.csswg.org/scroll-animations-1/#view-timeline-inset
#[derive(
    Clone,
    Copy,
    Debug,
    MallocSizeOf,
    PartialEq,
    SpecifiedValueInfo,
    ToComputedValue,
    ToResolvedValue,
    ToShmem,
)]
#[repr(C)]
pub struct GenericViewTimelineInset<LengthPercent> {
    /// The start inset in the relevant axis.
    pub start: GenericLengthPercentageOrAuto<LengthPercent>,
    /// The end inset.
    pub end: GenericLengthPercentageOrAuto<LengthPercent>,
}

pub use self::GenericViewTimelineInset as ViewTimelineInset;

impl<LengthPercent> ViewTimelineInset<LengthPercent> {
    /// Returns true if it is auto.
    #[inline]
    fn is_auto(&self) -> bool {
        self.start.is_auto() && self.end.is_auto()
    }
}

impl<LengthPercent> ToCss for ViewTimelineInset<LengthPercent>
where
    LengthPercent: PartialEq + ToCss,
{
    fn to_css<W>(&self, dest: &mut CssWriter<W>) -> fmt::Result
    where
        W: Write,
    {
        self.start.to_css(dest)?;
        if self.end != self.start {
            dest.write_char(' ')?;
            self.end.to_css(dest)?;
        }
        Ok(())
    }
}

impl<LengthPercent> Default for ViewTimelineInset<LengthPercent> {
    fn default() -> Self {
        Self {
            start: GenericLengthPercentageOrAuto::auto(),
            end: GenericLengthPercentageOrAuto::auto(),
        }
    }
}