const WebSocketStream = require('websocket-stream')
const ConcatStream = require('concat-stream')
const { Duplex, Readable } = require('stream')
const { Buffer } = require('buffer')

class Streamer {
    constructor(socket_uuid, node_uuid, length = 4096, position = 0) {
        this.socket_uuid = socket_uuid
        this.node_uuid = node_uuid
        this.length = length
        this.position = position
    }

    write(buffer) {
        console.log('write buffer pre slice', buffer)
        // buffer = buffer.slice(this.position, this.position + this.length)
        // console.log('write buffer post slice', buffer)

        const write_stream = WebSocketStream(`ws://localhost:5746/?socket_uuid=${this.socket_uuid}&node_uuid=${this.node_uuid}&length=${this.length}&position=${this.position}&writing_file=true`, {
            perMessageDeflate: false,
            binary: true,
        })

        console.log(write_stream)
        console.log('writing buffer', buffer.toString(), buffer)

        const read_stream = new Readable()
        read_stream.push(buffer.toString())
        read_stream.push(null)
        read_stream.pipe(write_stream)
    }

    stream() {
        this.ws = WebSocketStream(`ws://localhost:5746/?socket_uuid=${this.socket_uuid}&node_uuid=${this.node_uuid}&length=${this.length}&position=${this.position}`, {
            perMessageDeflate: false,
            binary: true,
        })

        return this.ws
    }

    async buffer() {
        return this._bufferStream(this.stream())
    }

    _bufferStream(stream) {
        const chunks = []
        return new Promise((resolve, reject) => {
            stream.on('data', chunk => chunks.push(chunk))
            stream.on('error', reject)
            stream.on('end', () => resolve(Buffer.concat(chunks)))
        })
    }

    close() {
        this.ws.close()
    }
}

module.exports = exports = Streamer