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use webcore::value::Reference;
use webcore::try_from::TryInto;
use webcore::reference_type::ReferenceType;

/// A blob object represents a file-like object of immutable, raw data.
/// Blobs represent data that isn't necessarily in a JavaScript-native format.
///
/// [(JavaScript docs)](https://developer.mozilla.org/en-US/docs/Web/API/Blob)
// https://w3c.github.io/FileAPI/#dfn-Blob
pub trait IBlob: ReferenceType {
    /// The size, in bytes, of the data contained in the Blob object.
    ///
    /// [(JavaScript docs)](https://developer.mozilla.org/en-US/docs/Web/API/Blob/size)
    // https://w3c.github.io/FileAPI/#ref-for-dfn-size%E2%91%A0
    fn len( &self ) -> u64 {
        let reference = self.as_ref();
        let length: u64 = js!( return @{reference}.size; ).try_into().unwrap();
        length
    }

    /// A string indicating the MIME type of the data contained in the `Blob`.
    ///
    /// [(JavaScript docs)](https://developer.mozilla.org/en-US/docs/Web/API/Blob/type)
    // https://w3c.github.io/FileAPI/#ref-for-dfn-type%E2%91%A0
    fn mime( &self ) -> Option< String > {
        let reference = self.as_ref();
        let mime: String = js!( return @{reference}.type; ).try_into().unwrap();
        if mime.is_empty() {
            None
        } else {
            Some( mime )
        }
    }
}

/// A reference to a JavaScript object which implements the [IBlob](trait.IBlob.html)
/// interface.
///
/// [(JavaScript docs)](https://developer.mozilla.org/en-US/docs/Web/API/Blob)
// https://w3c.github.io/FileAPI/#dfn-Blob
#[derive(Clone, Debug, PartialEq, Eq, ReferenceType)]
#[reference(instance_of = "Blob")]
pub struct Blob( Reference );

impl IBlob for Blob {}