import {getStreamContents} from './contents.js';

import {identity, getContentsProp, throwObjectStream, getLengthProp} from './utils.js';

export async function getStreamAsString(stream, options) {

return getStreamContents(stream, stringMethods, options);

}

const initString = () => ({contents: '', textDecoder: new TextDecoder()});

const useTextDecoder = (chunk, {textDecoder}) => textDecoder.decode(chunk, {stream: true});

const addStringChunk = (convertedChunk, {contents}) => contents + convertedChunk;

const truncateStringChunk = (convertedChunk, chunkSize) => convertedChunk.slice(0, chunkSize);

const getFinalStringChunk = ({textDecoder}) => {

const finalChunk = textDecoder.decode();

return finalChunk === '' ? undefined : finalChunk;

};

const stringMethods = {

init: initString,

convertChunk: {

string: identity,

buffer: useTextDecoder,

arrayBuffer: useTextDecoder,

dataView: useTextDecoder,

typedArray: useTextDecoder,

others: throwObjectStream,

},

getSize: getLengthProp,

truncateChunk: truncateStringChunk,

addChunk: addStringChunk,

getFinalChunk: getFinalStringChunk,

finalize: getContentsProp,

};