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/// Casting iterator adapters for rotations.
pub mod rotations;

/// Casting iterator adapters for morph target weights.
pub mod morph_target_weights;

use crate::accessor;

use crate::animation::Channel;
use crate::Buffer;

/// Animation input sampler values of type `f32`.
pub type ReadInputs<'a> = accessor::Iter<'a, f32>;

/// Animation output sampler values of type `[f32; 3]`.
pub type Translations<'a> = accessor::Iter<'a, [f32; 3]>;

/// Animation output sampler values of type `[f32; 3]`.
pub type Scales<'a> = accessor::Iter<'a, [f32; 3]>;

/// Animation channel reader.
#[derive(Clone, Debug)]
pub struct Reader<'a, 's, F>
where
    F: Clone + Fn(Buffer<'a>) -> Option<&'s [u8]>,
{
    pub(crate) channel: Channel<'a>,
    pub(crate) get_buffer_data: F,
}

/// Rotation animations
#[derive(Clone, Debug)]
pub enum Rotations<'a> {
    /// Rotations of type `[i8; 4]`.
    I8(accessor::Iter<'a, [i8; 4]>),
    /// Rotations of type `[u8; 4]`.
    U8(accessor::Iter<'a, [u8; 4]>),
    /// Rotations of type `[i16; 4]`.
    I16(accessor::Iter<'a, [i16; 4]>),
    /// Rotations of type `[u16; 4]`.
    U16(accessor::Iter<'a, [u16; 4]>),
    /// Rotations of type `[f32; 4]`.
    F32(accessor::Iter<'a, [f32; 4]>),
}

/// Morph-target weight animations.
#[derive(Clone, Debug)]
pub enum MorphTargetWeights<'a> {
    /// Weights of type `i8`.
    I8(accessor::Iter<'a, i8>),
    /// Weights of type `u8`.
    U8(accessor::Iter<'a, u8>),
    /// Weights of type `i16`.
    I16(accessor::Iter<'a, i16>),
    /// Weights of type `u16`.
    U16(accessor::Iter<'a, u16>),
    /// Weights of type `f32`.
    F32(accessor::Iter<'a, f32>),
}

/// Animation output sampler values.
pub enum ReadOutputs<'a> {
    /// XYZ translations of type `[f32; 3]`.
    Translations(Translations<'a>),

    /// Rotation animations.
    Rotations(Rotations<'a>),

    /// XYZ scales of type `[f32; 3]`.
    Scales(Scales<'a>),

    /// Morph target animations.
    MorphTargetWeights(MorphTargetWeights<'a>),
}

impl<'a> Rotations<'a> {
    /// Reinterpret rotations as u16.  Lossy if underlying iterator yields u8,
    /// i16, u16 or f32.
    pub fn into_i8(self) -> rotations::CastingIter<'a, rotations::I8> {
        rotations::CastingIter::new(self)
    }

    /// Reinterpret rotations as u16.  Lossy if underlying iterator yields i16,
    /// u16 or f32.
    pub fn into_u8(self) -> rotations::CastingIter<'a, rotations::U8> {
        rotations::CastingIter::new(self)
    }

    /// Reinterpret rotations as u16.  Lossy if underlying iterator yields u16
    /// or f32.
    pub fn into_i16(self) -> rotations::CastingIter<'a, rotations::I16> {
        rotations::CastingIter::new(self)
    }

    /// Reinterpret rotations as u16.  Lossy if underlying iterator yields f32.
    pub fn into_u16(self) -> rotations::CastingIter<'a, rotations::U16> {
        rotations::CastingIter::new(self)
    }

    /// Reinterpret rotations as f32.  Lossy if underlying iterator yields i16
    /// or u16.
    pub fn into_f32(self) -> rotations::CastingIter<'a, rotations::F32> {
        rotations::CastingIter::new(self)
    }
}

impl<'a> MorphTargetWeights<'a> {
    /// Reinterpret morph weights as u16.  Lossy if underlying iterator yields
    /// u8, i16, u16 or f32.
    pub fn into_i8(self) -> morph_target_weights::CastingIter<'a, morph_target_weights::I8> {
        morph_target_weights::CastingIter::new(self)
    }

    /// Reinterpret morph weights as u16.  Lossy if underlying iterator yields
    /// i16, u16 or f32.
    pub fn into_u8(self) -> morph_target_weights::CastingIter<'a, morph_target_weights::U8> {
        morph_target_weights::CastingIter::new(self)
    }

    /// Reinterpret morph weights as u16.  Lossy if underlying iterator yields
    /// u16 or f32.
    pub fn into_i16(self) -> morph_target_weights::CastingIter<'a, morph_target_weights::I16> {
        morph_target_weights::CastingIter::new(self)
    }

    /// Reinterpret morph weights as u16.  Lossy if underlying iterator yields
    /// f32.
    pub fn into_u16(self) -> morph_target_weights::CastingIter<'a, morph_target_weights::U16> {
        morph_target_weights::CastingIter::new(self)
    }

    /// Reinterpret morph weights as f32.  Lossy if underlying iterator yields
    /// i16 or u16.
    pub fn into_f32(self) -> morph_target_weights::CastingIter<'a, morph_target_weights::F32> {
        morph_target_weights::CastingIter::new(self)
    }
}

impl<'a, 's, F> Reader<'a, 's, F>
where F: Clone + Fn(Buffer<'a>) -> Option<&'s [u8]>,
{
    /// Visits the input samples of a channel.
    pub fn read_inputs(&self) -> Option<ReadInputs<'s>> {
        accessor::Iter::new(self.channel.sampler().input(), self.get_buffer_data.clone())
    }

    /// Visits the output samples of a channel.
    pub fn read_outputs(&self) -> Option<ReadOutputs<'s>> {
        use accessor::{DataType, Iter};
        use crate::animation::Property;
        let output = self.channel.sampler().output();
        match self.channel.target().property() {
            Property::Translation => Iter::new(output, self.get_buffer_data.clone()).map(ReadOutputs::Translations),
            Property::Rotation => {
                match output.data_type() {
                    DataType::I8 => Iter::new(output, self.get_buffer_data.clone()).map(|x| ReadOutputs::Rotations(Rotations::I8(x))),
                    DataType::U8 => Iter::new(output, self.get_buffer_data.clone()).map(|x| ReadOutputs::Rotations(Rotations::U8(x))),
                    DataType::I16 => Iter::new(output, self.get_buffer_data.clone()).map(|x| ReadOutputs::Rotations(Rotations::I16(x))),
                    DataType::U16 => Iter::new(output, self.get_buffer_data.clone()).map(|x| ReadOutputs::Rotations(Rotations::U16(x))),
                    DataType::F32 => Iter::new(output, self.get_buffer_data.clone()).map(|x| ReadOutputs::Rotations(Rotations::F32(x))),
                    _ => unreachable!()
                }
            },
            Property::Scale => Iter::new(output, self.get_buffer_data.clone()).map(ReadOutputs::Scales),
            Property::MorphTargetWeights => {
                match output.data_type() {
                    DataType::I8 => Iter::new(output, self.get_buffer_data.clone()).map(|x| ReadOutputs::MorphTargetWeights(MorphTargetWeights::I8(x))),
                    DataType::U8 => Iter::new(output, self.get_buffer_data.clone()).map(|x| ReadOutputs::MorphTargetWeights(MorphTargetWeights::U8(x))),
                    DataType::I16 => Iter::new(output, self.get_buffer_data.clone()).map(|x| ReadOutputs::MorphTargetWeights(MorphTargetWeights::I16(x))),
                    DataType::U16 => Iter::new(output, self.get_buffer_data.clone()).map(|x| ReadOutputs::MorphTargetWeights(MorphTargetWeights::U16(x))),
                    DataType::F32 => Iter::new(output, self.get_buffer_data.clone()).map(|x| ReadOutputs::MorphTargetWeights(MorphTargetWeights::F32(x))),
                    _ => unreachable!()
                }
            },
        }
    }
}