import {FetchAdapterResponse} from "../fetchAdapter";

/**
 * ## ResponseHelpers **Response工具类**
 * **/
export class ResponseHelpers {

    /** 将json重新封装成FetchAdapterResponse对象 **/
    public static async repackResponseByJson(json: Object, fetchAdapterResponse: FetchAdapterResponse) {
        let readableStream: any = undefined

        //RN不支持ReadableStream
        if (typeof ReadableStream !== "undefined" && ReadableStream) {
            readableStream = new ReadableStream({
                async start(controller) {
                    const reader = async () => {
                        const uint8Array: Uint8Array = new TextEncoder().encode(JSON.stringify(json))

                        controller.enqueue(uint8Array)
                        controller.close()

                        return
                    }

                    return reader()
                }
            })
        } else {
            readableStream = JSON.stringify(json)
        }

        return new FetchAdapterResponse(readableStream, fetchAdapterResponse)
    }
}