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use webcore::value::Reference;
use webcore::try_from::TryInto;
use webcore::value::Value;

/// The `ArrayBuffer` object is used to represent a generic, fixed-length raw binary data buffer.
/// You cannot directly manipulate the contents of an ArrayBuffer; instead, you create an [TypedArray](struct.TypedArray.html)
/// to do it.
///
/// [(JavaScript docs)](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/ArrayBuffer)
pub struct ArrayBuffer( Reference );

impl ArrayBuffer {
    /// Creates a new `ArrayBuffer` with the given length in bytes.
    pub fn new( length: usize ) -> Self {
        let length: Value = length.try_into().unwrap();
        js!( return new ArrayBuffer( @{length} ); ).try_into().unwrap()
    }

    /// Returns the length of the buffer, in bytes.
    pub fn len( &self ) -> usize {
        let reference = self.as_ref();
        let length: i32 = js!( return @{reference}.byteLength; ).try_into().unwrap();
        length as usize
    }
}

reference_boilerplate! {
    ArrayBuffer,
    instanceof ArrayBuffer
}