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use nom::types::CompleteByteSlice;
use ::parser::{le_u8, le_u32};

/// A renderable voxel Model
#[derive(Debug, PartialEq)]
pub struct Model {
    /// The size of the model in voxels
    pub size: Size,
    /// The voxels to be displayed.
    pub voxels: Vec<Voxel>,
}

/// The size of a model in voxels
///
/// Indicates the size of the model in Voxels.
#[derive(Copy, Clone, Debug, PartialEq)]
pub struct Size {
    /// The width of the model in voxels.
    pub x: u32,
    /// The height of the model in voxels.
    pub y: u32,
    /// The depth of the model in voxels.
    pub z: u32,
}

/// A Voxel
///
/// A Voxel is a point in 3D space, with an indexed colour attached.
#[derive(Clone, Copy, Debug, PartialEq)]
pub struct Voxel {
    /// The X coordinate for the Voxel
    pub x: u8,
    /// The Y coordinate for the Voxel
    pub y: u8,
    /// The Z coordinate for the Voxel
    pub z: u8,
    /// Index in the Color Palette. Note that this will be 1 less than the value stored in the
    /// source file, as the palette indices run from 1-255, whereas in memory the indices run from
    /// 0-254. Therefore, to make life easier, we store the in-memory index here. Should you require
    /// the source file's indices, simply add 1 to this value.
    pub i: u8,
}

named!(pub parse_size <CompleteByteSlice, Size>, do_parse!(
  x: le_u32 >>
  y: le_u32 >>
  z: le_u32 >>
  (Size { x, y, z })
));

named!(parse_voxel <CompleteByteSlice, Voxel>, do_parse!(
  x: le_u8 >>
  y: le_u8 >>
  z: le_u8 >>
  i: le_u8 >>
  (Voxel { x, y, z, i: i.saturating_sub(1) })
));

named!(pub parse_voxels <CompleteByteSlice, Vec<Voxel> >, do_parse!(
  num_voxels: le_u32 >>
  voxels: many_m_n!(num_voxels as usize, num_voxels as usize, parse_voxel) >>
  (voxels)
));