import { Buffer } from "buffer";
import _, {floor} from "lodash";

const statics: any = {
    'ESC': '1B',
    'FF': '0C'
}

const mmToInch = 0.0393701;
// 26x51 label, or 1" x 2"

const pageWidth = getPageDimensionParameters(2);
const pageHeight = getPageDimensionParameters(1);
const command = `
    ESC i a 00h
    ESC @
    ESC i L 01h
    ESC ( C 02h 00h ${pageWidth.mL} ${pageWidth.mH}
    ESC $ CBh 00h
    ESC ( V 02h 00h ${pageHeight.mL} ${pageHeight.mH}
    ESC k 0Bh
    ESC X 00h 40h 00h
    ESC i t0 r0 h E0h 00h w1 e0 z0 f1 B 123456789 \\
    FF
`;


console.warn('output: ', parseEscToHex(command))

function inchToDots(value: number, dpi = 203) {
    const dots = value * dpi;
    const margin = 6 * mmToInch * dpi;

    return Math.round(dots - margin);
}

function toHex(value: number) {
    return value.toString(16).padStart(2, '0') + 'h';
}

function getPageDimensionParameters(inInches: number) {
    const dots = inchToDots(inInches);

    const mH = Math.floor(dots / 265);
    const mL = dots - mH * 265;

    return {
        mH: toHex(mH), mL: toHex(mL)
    }
}

function parseEscToHex(text: string): string {

    return text.trim().split(/\s+/)
        .map(chunk => {
            if (_.has(statics, chunk)) {
                // Found static mapping
                return statics[chunk]
            }

            if(chunk.length == 3 && chunk.endsWith('h')) {
                // parse as hex
                return chunk.slice(0, -1)
            }

            return Buffer.from(chunk).toString('hex')

        })
        .join(' ')

}