FEDEO/src/utils/functions.ts

import {FastifyInstance} from "fastify";
import { PNG } from 'pngjs'
import { ready as zplReady } from 'zpl-renderer-js'
import { Utils } from '@mmote/niimbluelib'
import { createCanvas } from 'canvas'
import bwipjs from 'bwip-js'
import Sharp from 'sharp'
import fs from 'fs'

export const useNextNumberRangeNumber = async (server:FastifyInstance, tenantId:number,numberRange)=> {
    const {data:tenant} = await server.supabase.from("tenants").select().eq("id",tenantId).single()

    const numberRanges = tenant.numberRanges

    const usedNumber = (numberRanges[numberRange].prefix ? numberRanges[numberRange].prefix : "") + numberRanges[numberRange].nextNumber + (numberRanges[numberRange].suffix ? numberRanges[numberRange].suffix : "")

    let newNumberRange = numberRanges

    newNumberRange[numberRange].nextNumber += 1

    const {error} = await server.supabase.from("tenants").update({numberRanges: newNumberRange}).eq("id",tenantId)

    if(error) {
        console.log(error)
    } else {
        return {
            usedNumber
        }
    }
}

export async function encodeBase64ToNiimbot(base64Png, printDirection = 'top') {
    // 1️⃣ PNG dekodieren
    const buffer = Buffer.from(base64Png, 'base64')
    const png = PNG.sync.read(buffer) // liefert {width, height, data: Uint8Array(RGBA)}

    const { width, height, data } = png
    console.log(width, height, data)
    const cols = printDirection === 'left' ? height : width
    const rows = printDirection === 'left' ? width : height
    const rowsData = []

    console.log(cols)

    if (cols % 8 !== 0) throw new Error('Column count must be multiple of 8')

    // 2️⃣ Zeilenweise durchgehen und Bits bilden
    for (let row = 0; row < rows; row++) {
        let isVoid = true
        let blackPixelsCount = 0
        const rowData = new Uint8Array(cols / 8)

        for (let colOct = 0; colOct < cols / 8; colOct++) {
            let pixelsOctet = 0
            for (let colBit = 0; colBit < 8; colBit++) {
                const x = printDirection === 'left' ? row : colOct * 8 + colBit
                const y = printDirection === 'left' ? height - 1 - (colOct * 8 + colBit) : row
                const idx = (y * width + x) * 4
                const lum = 0.299 * data[idx] + 0.587 * data[idx + 1] + 0.114 * data[idx + 2]
                const isBlack = lum < 128
                if (isBlack) {
                    pixelsOctet |= 1 << (7 - colBit)
                    isVoid = false
                    blackPixelsCount++
                }
            }
            rowData[colOct] = pixelsOctet
        }

        const newPart = {
            dataType: isVoid ? 'void' : 'pixels',
            rowNumber: row,
            repeat: 1,
            rowData: isVoid ? undefined : rowData,
            blackPixelsCount,
        }

        if (rowsData.length === 0) {
            rowsData.push(newPart)
        } else {
            const last = rowsData[rowsData.length - 1]
            let same = newPart.dataType === last.dataType
            if (same && newPart.dataType === 'pixels') {
                same = Utils.u8ArraysEqual(newPart.rowData, last.rowData)
            }
            if (same) last.repeat++
            else rowsData.push(newPart)
            if (row % 200 === 199) {
                rowsData.push({
                    dataType: 'check',
                    rowNumber: row,
                    repeat: 0,
                    rowData: undefined,
                    blackPixelsCount: 0,
                })
            }
        }
    }

    return { cols, rows, rowsData }
}

export async function generateLabel(context,width,height) {
    // Canvas für Hintergrund & Text
    const canvas = createCanvas(width, height)
    const ctx = canvas.getContext('2d')

    // Hintergrund weiß
    ctx.fillStyle = '#FFFFFF'
    ctx.fillRect(0, 0, width, height)

    // Überschrift
    ctx.fillStyle = '#000000'
    ctx.font = '32px Arial'
    ctx.fillText(context.text, 20, 40)

    // 3) DataMatrix
    const dataMatrixPng = await bwipjs.toBuffer({
        bcid:  'datamatrix',
        text:  context.datamatrix,
        scale: 6,
    })

    // Basisbild aus Canvas
    const base = await Sharp(canvas.toBuffer())
        .png()
        .toBuffer()

    // Alles zusammen compositen
    const final = await Sharp(base)
        .composite([
            { input: dataMatrixPng, top: 60, left: 20 },
        ])
        .png()
        .toBuffer()

    fs.writeFileSync('label.png', final)

    // Optional: Base64 zurückgeben (z.B. für API)
    const base64 = final.toString('base64')

    return base64
}