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use super::{
    super::{vek::*, Animation},
    BirdMediumSkeleton, SkeletonAttr,
};
use common::states::utils::StageSection;

pub struct AlphaAnimation;

impl Animation for AlphaAnimation {
    type Dependency<'a> = (Option<StageSection>, f32, f32, Vec3<f32>, Vec3<f32>, bool);
    type Skeleton = BirdMediumSkeleton;

    #[cfg(feature = "use-dyn-lib")]
    const UPDATE_FN: &'static [u8] = b"bird_medium_alpha\0";

    #[cfg_attr(feature = "be-dyn-lib", export_name = "bird_medium_alpha")]
    fn update_skeleton_inner<'a>(
        skeleton: &Self::Skeleton,
        (stage_section, global_time, timer, orientation, last_ori, on_ground): Self::Dependency<'_>,
        anim_time: f32,
        _rate: &mut f32,
        s_a: &SkeletonAttr,
    ) -> Self::Skeleton {
        let mut next = (*skeleton).clone();

        let (move1base, move2base, move3) = match stage_section {
            Some(StageSection::Buildup) => (anim_time.powf(0.25), 0.0, 0.0),
            Some(StageSection::Action) => (1.0, anim_time, 0.0),
            Some(StageSection::Recover) => (1.0, 1.0, anim_time.powf(4.0)),
            _ => (0.0, 0.0, 0.0),
        };

        let wave_slow_cos = (anim_time * 4.5).cos();

        let pullback = 1.0 - move3;

        let subtract = global_time - timer;
        let check = subtract - subtract.trunc();
        let mirror = (check - 0.5).signum();

        let move1 = move1base * pullback;
        let move2 = move2base * pullback;
        let move1mirror = move1base * pullback * mirror;
        let ori: Vec2<f32> = Vec2::from(orientation);
        let last_ori = Vec2::from(last_ori);
        let _tilt = if vek::Vec2::new(ori, last_ori)
            .map(|o| o.magnitude_squared())
            .map(|m| m > 0.001 && m.is_finite())
            .reduce_and()
            && ori.angle_between(last_ori).is_finite()
        {
            ori.angle_between(last_ori).min(0.2)
                * last_ori.determine_side(Vec2::zero(), ori).signum()
        } else {
            0.0
        } * 1.3;

        next.chest.position =
            Vec3::new(0.0, s_a.chest.0, s_a.chest.1 + wave_slow_cos * 0.06 + move2);
        next.chest.orientation = Quaternion::rotation_x(move1 * 0.5 - move2 * 0.8);

        next.head.position = Vec3::new(0.0, s_a.head.0, s_a.head.1);
        next.head.orientation = Quaternion::rotation_x(move1 * -0.2 - move2 * 0.2)
            * Quaternion::rotation_y(move1mirror * 0.5);

        if on_ground {
            next.tail.position = Vec3::new(0.0, s_a.tail.0, s_a.tail.1);
            next.tail.orientation = Quaternion::rotation_x(-move1 * 0.2);

            next.wing_in_l.position = Vec3::new(-s_a.wing_in.0, s_a.wing_in.1, s_a.wing_in.2);
            next.wing_in_r.position = Vec3::new(s_a.wing_in.0, s_a.wing_in.1, s_a.wing_in.2);

            next.wing_in_l.orientation =
                Quaternion::rotation_y(-1.0 + wave_slow_cos * 0.06 + move1 * 1.0 + move2 * 0.5)
                    * Quaternion::rotation_z(0.2);
            next.wing_in_r.orientation =
                Quaternion::rotation_y(1.0 - wave_slow_cos * 0.06 + move1 * -1.0 + move2 * -0.5)
                    * Quaternion::rotation_z(-0.2);

            next.wing_out_l.position = Vec3::new(-s_a.wing_out.0, s_a.wing_out.1, s_a.wing_out.2);
            next.wing_out_r.position = Vec3::new(s_a.wing_out.0, s_a.wing_out.1, s_a.wing_out.2);
            next.wing_out_l.orientation =
                Quaternion::rotation_y(-0.2 + move1 * -0.3) * Quaternion::rotation_z(0.2);
            next.wing_out_r.orientation =
                Quaternion::rotation_y(0.2 + move1 * 0.3) * Quaternion::rotation_z(-0.2);
        }

        next
    }
}