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// Copyright (c) 2016 The vulkano developers
// Licensed under the Apache License, Version 2.0
// <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT
// license <LICENSE-MIT or http://opensource.org/licenses/MIT>,
// at your option. All files in the project carrying such
// notice may not be copied, modified, or distributed except
// according to those terms.

use std::marker::PhantomData;
use std::mem;
use std::option::IntoIter as OptionIntoIter;
use std::sync::Arc;
use std::vec::IntoIter as VecIntoIter;

use buffer::BufferAccess;
use buffer::TypedBufferAccess;
use pipeline::shader::ShaderInterfaceDef;
use pipeline::vertex::AttributeInfo;
use pipeline::vertex::IncompatibleVertexDefinitionError;
use pipeline::vertex::InputRate;
use pipeline::vertex::Vertex;
use pipeline::vertex::VertexDefinition;
use pipeline::vertex::VertexSource;

/// Implementation of `VertexDefinition` for a single vertex buffer.
pub struct SingleBufferDefinition<T>(pub PhantomData<T>);

impl<T> SingleBufferDefinition<T> {
    #[inline]
    pub fn new() -> SingleBufferDefinition<T> {
        SingleBufferDefinition(PhantomData)
    }
}

unsafe impl<T, I> VertexDefinition<I> for SingleBufferDefinition<T>
    where T: Vertex,
          I: ShaderInterfaceDef
{
    type BuffersIter = OptionIntoIter<(u32, usize, InputRate)>;
    type AttribsIter = VecIntoIter<(u32, u32, AttributeInfo)>;

    fn definition(
        &self, interface: &I)
        -> Result<(Self::BuffersIter, Self::AttribsIter), IncompatibleVertexDefinitionError> {
        let attrib = {
            let mut attribs = Vec::with_capacity(interface.elements().len());
            for e in interface.elements() {
                let name = e.name.as_ref().unwrap();

                let infos = match <T as Vertex>::member(name) {
                    Some(m) => m,
                    None => return Err(IncompatibleVertexDefinitionError::MissingAttribute {
                                           attribute: name.clone().into_owned(),
                                       }),
                };

                if !infos.ty.matches(infos.array_size,
                                     e.format,
                                     e.location.end - e.location.start)
                {
                    return Err(IncompatibleVertexDefinitionError::FormatMismatch {
                                   attribute: name.clone().into_owned(),
                                   shader: (e.format, (e.location.end - e.location.start) as usize),
                                   definition: (infos.ty, infos.array_size),
                               });
                }

                let mut offset = infos.offset;
                for loc in e.location.clone() {
                    attribs.push((loc,
                                  0,
                                  AttributeInfo {
                                      offset: offset,
                                      format: e.format,
                                  }));
                    offset += e.format.size().unwrap();
                }
            }
            attribs
        }.into_iter(); // TODO: meh

        let buffers = Some((0, mem::size_of::<T>(), InputRate::Vertex)).into_iter();
        Ok((buffers, attrib))
    }
}

unsafe impl<V> VertexSource<Vec<Arc<dyn BufferAccess + Send + Sync>>> for SingleBufferDefinition<V>
    where V: Vertex
{
    #[inline]
    fn decode(&self, mut source: Vec<Arc<dyn BufferAccess + Send + Sync>>)
              -> (Vec<Box<dyn BufferAccess + Send + Sync>>, usize, usize) {
        // FIXME: safety
        assert_eq!(source.len(), 1);
        let len = source[0].size() / mem::size_of::<V>();
        (vec![Box::new(source.remove(0))], len, 1)
    }
}

unsafe impl<'a, B, V> VertexSource<B> for SingleBufferDefinition<V>
    where B: TypedBufferAccess<Content = [V]> + Send + Sync + 'static,
          V: Vertex
{
    #[inline]
    fn decode(&self, source: B) -> (Vec<Box<dyn BufferAccess + Send + Sync>>, usize, usize) {
        let len = source.len();
        (vec![Box::new(source) as Box<_>], len, 1)
    }
}