import EventEmitter from 'events'
import SerialPort from 'serialport'
import { BoardConfig } from '../board';
import { sleep, serialportPromisify } from '../util';
import { SerialPortAdapter } from '../webserial/adapter'

abstract class Uploader extends EventEmitter {
    protected boardConfig: BoardConfig;

    constructor(boardConfig: BoardConfig) {
        super();
        this.boardConfig = boardConfig;
    }

    protected abstract bootload(port: SerialPort | SerialPortAdapter, hex: Buffer): Promise<void>;

    public async upload(port: SerialPort | SerialPortAdapter, hex: string | Buffer) {
        hex = Buffer.from(hex);

        const baudRate = this.boardConfig.baudRate;

        const { open, close, update } = serialportPromisify(port)

        if (!port.isOpen) {
            await open();
        }

        if (port.baudRate !== baudRate) {
            console.log('update baudRate', baudRate)
            await update({ baudRate })
            await sleep(250)
        }

        console.log('reset...')
        await this.reset(port);

        console.log('upload...')
        await this.bootload(port, hex);

        if (port.isOpen) {
            await close();
            console.log('close port')
        }
    }

    protected async reset(port: SerialPort | SerialPortAdapter) {
        const { set } = serialportPromisify(port)

        await set({
            dtr: false,
            rts: false
        })
        await sleep(250)
        await set({
            dtr: true,
            rts: false
        })
        await sleep(50)
    }
}

export { Uploader }