const NodeSpeaker = require('speaker');
const createReadStream = require('fs').createReadStream;

class Speaker {

    constructor(channels, bitDepth, sampleRate) {
        this.#handlePlayer(channels, bitDepth, sampleRate);
        this.playback = {
            played: 0,
            tmp: 0
        };
    }

    pipe(data) {
        return this.speaker.write(data);
    }

    // pipe(buffer, position) {
    //     if (buffer === undefined) {
    //         return;
    //     }
    //     this.playback.stream = createReadStream(file);
    //     if (isNaN(position) || position < 0) {
    //         position = 0;
    //     }
    //     position = 65537* 100;
    //     this.playback.stream.on('data', (data) => {
    //         if (position > 0 && this.playback.played <= position) {
    //             const offset = position - (this.playback.played + data.length);
    //             if (offset >= 0) {
    //                 this.playback.played += data.length;
    //                 return;
    //             }
    //             data = data.subarray(data.length + offset);
    //         }
    //         if (this.speaker.write(data) === true) {
    //             this.playback.played += data.length;
    //         } else {
    //             this.playback.tmp = data.length;
    //             this.playback.stream.pause();
    //         }
    //     });
    //     this.playback.stream.on('end', () => {
    //         logger.debug('read stream ended');
    //     });
    //     this.playback.stream.on('close', () => {
    //         logger.debug('read stream closed');
    //     });
    //     this.playback.stream.on('drain', () => {
    //         logger.debug('read stream drained');
    //     });
    //     this.playback.stream.on('error', (error) => {
    //         logger.debug('read stream encountered an error: ' + error);
    //     });
    // }

    #handlePlayer(channels, bitDepth, sampleRate) {
        this.speaker = new NodeSpeaker({
            channels: channels,
            bitDepth: bitDepth,
            sampleRate: sampleRate
        });
        this.speaker.on('open', () => {
            logger.debug('speaker opened...');
        });
        this.speaker.on('flush', () => {
            logger.debug('speaker flushed...');
        });
        this.speaker.on('close', () => {
            logger.debug('speaker closed...');
        });
        this.speaker.on('drain', () => {
            // handle backpressure
            // this.playback.played += this.tmp;
            // this.playback.tmp = 0;
            // this.playback.stream.resume();
        });
    }

}

module.exports = Speaker;