import numberOfComponentsForType from './numberOfComponentsForType.js'
import ComponentDatatype from '../../Core/ComponentDatatype.js'
import defined from '../../Core/defined.js'

    /**
     * Returns the byte stride of the provided accessor.
     * If the byteStride is 0, it is calculated based on type and componentType
     *
     * @param {Object} gltf A javascript object containing a glTF asset.
     * @param {Object} accessor The accessor.
     * @returns {Number} The byte stride of the accessor.
     *
     * @private
     */
    function getAccessorByteStride(gltf, accessor) {
        var bufferViewId = accessor.bufferView;
        if (defined(bufferViewId)) {
            var bufferView = gltf.bufferViews[bufferViewId];
            if (defined(bufferView.byteStride) && bufferView.byteStride > 0) {
                return bufferView.byteStride;
            }
        }
        return ComponentDatatype.getSizeInBytes(accessor.componentType) * numberOfComponentsForType(accessor.type);
    }

    export default getAccessorByteStride;