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pub mod idle;
pub mod swim;

// Reexports
pub use self::{idle::IdleAnimation, swim::SwimAnimation};

use super::{make_bone, vek::*, FigureBoneData, Offsets, Skeleton};
use common::comp::{self};
use core::convert::TryFrom;

pub type Body = comp::fish_small::Body;

skeleton_impls!(struct FishSmallSkeleton {
    + chest,
    + tail,
    + fin_l,
    + fin_r,
});

impl Skeleton for FishSmallSkeleton {
    type Attr = SkeletonAttr;
    type Body = Body;

    const BONE_COUNT: usize = 4;
    #[cfg(feature = "use-dyn-lib")]
    const COMPUTE_FN: &'static [u8] = b"fish_small_compute_mats\0";

    #[cfg_attr(feature = "be-dyn-lib", export_name = "fish_small_compute_mats")]
    fn compute_matrices_inner(
        &self,
        base_mat: Mat4<f32>,
        buf: &mut [FigureBoneData; super::MAX_BONE_COUNT],
        body: Self::Body,
    ) -> Offsets {
        let base_mat = base_mat * Mat4::scaling_3d(1.0 / 13.0);
        let chest_mat = base_mat * Mat4::<f32>::from(self.chest);

        *(<&mut [_; Self::BONE_COUNT]>::try_from(&mut buf[0..Self::BONE_COUNT]).unwrap()) = [
            make_bone(chest_mat),
            make_bone(chest_mat * Mat4::<f32>::from(self.tail)),
            make_bone(chest_mat * Mat4::<f32>::from(self.fin_l)),
            make_bone(chest_mat * Mat4::<f32>::from(self.fin_r)),
        ];

        let (mount_bone_mat, mount_bone_ori) = (chest_mat, self.chest.orientation);
        let mount_position = mount_bone_mat.mul_point(mount_point(&body));
        let mount_orientation = mount_bone_ori;

        Offsets {
            viewpoint: Some((chest_mat * Vec4::new(0.0, 3.0, 0.0, 1.0)).xyz()),
            // TODO: see quadruped_medium for how to animate this
            mount_bone: Transform {
                position: mount_position,
                orientation: mount_orientation,
                scale: Vec3::one(),
            },
            ..Default::default()
        }
    }
}

pub struct SkeletonAttr {
    chest: (f32, f32),
    tail: (f32, f32),
    fin: (f32, f32, f32),
    tempo: f32,
    amplitude: f32,
}

impl<'a> TryFrom<&'a comp::Body> for SkeletonAttr {
    type Error = ();

    fn try_from(body: &'a comp::Body) -> Result<Self, Self::Error> {
        match body {
            comp::Body::FishSmall(body) => Ok(SkeletonAttr::from(body)),
            _ => Err(()),
        }
    }
}

impl Default for SkeletonAttr {
    fn default() -> Self {
        Self {
            chest: (0.0, 0.0),
            tail: (0.0, 0.0),
            fin: (0.0, 0.0, 0.0),
            tempo: 0.0,
            amplitude: 0.0,
        }
    }
}

impl<'a> From<&'a Body> for SkeletonAttr {
    fn from(body: &'a Body) -> Self {
        use comp::fish_small::Species::*;
        Self {
            chest: match (body.species, body.body_type) {
                (Clownfish, _) => (0.0, 5.0),
                (Piranha, _) => (0.0, 5.0),
            },
            tail: match (body.species, body.body_type) {
                (Clownfish, _) => (-7.5, -0.5),
                (Piranha, _) => (-5.5, -0.5),
            },
            fin: match (body.species, body.body_type) {
                (Clownfish, _) => (2.0, 0.5, 1.0),
                (Piranha, _) => (2.0, 0.5, -0.5),
            },
            tempo: match (body.species, body.body_type) {
                (Clownfish, _) => 5.0,
                (Piranha, _) => 5.0,
            },
            amplitude: match (body.species, body.body_type) {
                (Clownfish, _) => 4.0,
                (Piranha, _) => 4.0,
            },
        }
    }
}

fn mount_point(body: &Body) -> Vec3<f32> {
    use comp::fish_small::Species::*;
    match (body.species, body.body_type) {
        (Clownfish, _) => (0.0, 0.5, 3.0),
        (Piranha, _) => (0.0, -1.0, 4.5),
    }
    .into()
}