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use json;

use Gltf;

pub use json::buffer::Target;

/// A buffer points to binary data representing geometry, animations, or skins.
#[derive(Clone, Debug)]
pub struct Buffer<'a> {
    /// The parent `Gltf` struct.
    gltf: &'a Gltf,

    /// The corresponding JSON index.
    index: usize,

    /// The corresponding JSON struct.
    json: &'a json::buffer::Buffer,
}

/// A view into a buffer generally representing a subset of the buffer.
#[derive(Clone, Debug)]
pub struct View<'a> {
    /// The parent `Gltf` struct.
    gltf: &'a Gltf,

    /// The corresponding JSON index.
    index: usize,

    /// The corresponding JSON struct.
    json: &'a json::buffer::View,

    /// The parent `Buffer`.
    parent: Buffer<'a>,
}

impl<'a> Buffer<'a> {
    /// Constructs a `Buffer`.
    pub(crate) fn new(
        gltf: &'a Gltf,
        index: usize,
        json: &'a json::buffer::Buffer,
    ) -> Self {
        Self {
            gltf: gltf,
            index: index,
            json: json,
        }
    }

    /// Returns the internal JSON index.
    pub fn index(&self) -> usize {
        self.index
    }

    /// Returns the internal JSON item.
    #[doc(hidden)]
    pub fn as_json(&self) ->  &json::buffer::Buffer {
        self.json
    }

    /// Returns the uniform resource identifier for the buffer data.
    ///
    /// # Notes
    ///
    /// When the buffer is sourced from the `BIN` section of binary glTF, the
    /// fragment `"#bin"` is returned. This is non-standard according to the
    /// glTF specification.
    pub fn uri(&self) -> &str {
        self.json.uri.as_ref().map(String::as_str).unwrap_or("#bin")
    }

    /// The length of the buffer in bytes.
    pub fn length(&self) -> usize {
        self.json.byte_length as usize
    }

    /// Optional user-defined name for this object.
    #[cfg(feature = "names")]
    pub fn name(&self) -> Option<&str> {
        self.json.name.as_ref().map(String::as_str)
    }

    /// Optional application specific data.
    pub fn extras(&self) -> &json::Extras {
        &self.json.extras
    }
}

impl<'a> View<'a> {
    /// Constructs a `View`.
    pub(crate) fn new(
        gltf: &'a Gltf,
        index: usize,
        json: &'a json::buffer::View,
    ) -> Self {
        let parent = gltf.buffers().nth(json.buffer.value()).unwrap();
        Self {
            gltf,
            index,
            json,
            parent,
        }
    }

    /// Returns the internal JSON index.
    pub fn index(&self) -> usize {
        self.index
    }

    /// Returns the internal JSON item.
    #[doc(hidden)]
    pub fn as_json(&self) ->  &json::buffer::View {
        self.json
    }

    /// Returns the parent `Buffer`.
    pub fn buffer(&self) -> Buffer<'a> {
        self.gltf.buffers().nth(self.json.buffer.value()).unwrap()
    }

    /// Returns the length of the buffer view in bytes.
    pub fn length(&self) -> usize {
        self.json.byte_length as usize
    }

    /// Returns the offset into the parent buffer in bytes.
    pub fn offset(&self) -> usize {
        self.json.byte_offset as usize
    }

    /// Returns the stride in bytes between vertex attributes or other interleavable
    /// data. When `None`, data is assumed to be tightly packed.
    pub fn stride(&self) -> Option<usize> {
        self.json.byte_stride.map(|x| x.0 as usize)
    }

    /// Optional user-defined name for this object.
    #[cfg(feature = "names")]
    pub fn name(&self) -> Option<&str> {
        self.json.name.as_ref().map(String::as_str)
    }

    /// Optional target the buffer should be bound to.
    pub fn target(&self) -> Option<Target> {
        self.json.target.map(|target| target.unwrap())
    }

    /// Optional application specific data.
    pub fn extras(&self) -> &json::Extras {
        &self.json.extras
    }
}