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JsBarcode from \"jsbarcode\"\n\nexport type CodeBarFormat =\n | \"CODE128\"\n | \"CODE128A\"\n | \"CODE128B\"\n | \"CODE128C\"\n | \"EAN13\"\n | \"EAN8\"\n | \"EAN5\"\n | \"EAN2\"\n | \"UPC\"\n | \"CODE39\"\n | \"ITF14\"\n | \"ITF\"\n | \"MSI\"\n | \"MSI10\"\n | \"MSI11\"\n | \"MSI1010\"\n | \"MSI1110\"\n | \"pharmacode\"\n | \"codabar\"\n\nexport interface CodeBarOptions {\n value: string\n format?: CodeBarFormat\n width?: number \n height?: number \n displayValue?: boolean\n text?: string \n fontOptions?: string \n fontSize?: number\n textMargin?: number\n textAlign?: \"left\" | \"center\" | \"right\"\n textPosition?: \"top\" | \"bottom\"\n background?: string\n lineColor?: string\n margin?: number\n marginTop?: number\n marginBottom?: number\n marginLeft?: number\n marginRight?: number\n /**\n * Por defecto, si el checksum (dígito verificador) de un valor EAN13/EAN8/UPC\n * es incorrecto, se lanza un error explícito en vez de corregirlo en\n * silencio. Poné `autoFixChecksum: true` si preferís que se recalcule y\n * reemplace automáticamente (se sigue avisando por consola con un warn).\n */\n autoFixChecksum?: boolean\n}\n\n\n// (igual que se hace con los charts).\nconst barcodeCache = new Map()\n\nconst buildCacheKey = (options: CodeBarOptions): string => JSON.stringify(options)\n\n/**\n * Calcula el dígito verificador (checksum) para códigos EAN/UPC según el\n * algoritmo estándar GS1 (módulo 10, pesos alternados 3-1).\n * `digits` debe ser el número SIN el dígito de control (12 dígitos para\n * EAN13/UPC, 7 para EAN8).\n */\nconst calculateEanCheckDigit = (digits: string): string => {\n const nums = digits.split(\"\").map(Number)\n // El peso se aplica de derecha a izquierda: el último dígito (el más\n // cercano al checksum) tiene peso 3.\n let sum = 0\n for (let i = 0; i < nums.length; i++) {\n const weight = (nums.length - i) % 2 === 0 ? 1 : 3\n sum += nums[i] * weight\n }\n const checkDigit = (10 - (sum % 10)) % 10\n return String(checkDigit)\n}\n\n/**\n * Error específico para checksums EAN/UPC inválidos, para poder\n * distinguirlo si hace falta (instanceof CodeBarChecksumError) y para que\n * el mensaje llegue tal cual hasta la UI (ver CodeBar.tsx).\n */\nexport class CodeBarChecksumError extends Error {\n constructor(message: string) {\n super(message)\n this.name = \"CodeBarChecksumError\"\n }\n}\n\n/**\n * Valida el checksum de un valor EAN13, EAN8 o UPC antes de pasarlo a\n * JsBarcode.\n *\n * Comportamiento por defecto (autoFixChecksum = false): si el valor viene\n * con la longitud completa pero el dígito verificador es incorrecto, se\n * lanza un CodeBarChecksumError explícito en vez de corregirlo en\n * silencio — un checksum equivocado suele indicar un dato mal generado\n * río arriba, y taparlo con una corrección automática puede esconder ese\n * bug en vez de mostrarlo.\n *\n * Si se pasa autoFixChecksum = true, se recalcula y reemplaza el dígito\n * verificador incorrecto (se avisa igual por consola con un warn).\n *\n * En ambos casos, si el valor viene \"sin calcular\" (un dígito menos que lo\n * esperado), se completa automáticamente con el checksum calculado: esto\n * no es una corrección de un dato erróneo, sino una forma soportada de\n * pasar el código sin el dígito de control.\n */\nconst normalizeEanValue = (\n value: string,\n format: CodeBarFormat,\n autoFixChecksum: boolean,\n): string => {\n const expectedLengths: Partial> = {\n EAN13: 13,\n EAN8: 8,\n UPC: 12,\n }\n\n const expectedLength = expectedLengths[format]\n if (!expectedLength) return value // no es un formato con checksum conocido acá\n\n const onlyDigits = value.replace(/\\D/g, \"\")\n\n // Si vino sin el dígito verificador (un dígito menos), lo calculamos y completamos.\n if (onlyDigits.length === expectedLength - 1) {\n const checkDigit = calculateEanCheckDigit(onlyDigits)\n return onlyDigits + checkDigit\n }\n\n // Si vino con la longitud completa, verificamos que el checksum sea correcto.\n if (onlyDigits.length === expectedLength) {\n const body = onlyDigits.slice(0, -1)\n const providedCheckDigit = onlyDigits.slice(-1)\n const correctCheckDigit = calculateEanCheckDigit(body)\n\n if (providedCheckDigit !== correctCheckDigit) {\n if (autoFixChecksum) {\n console.warn(\n `El dígito verificador de \"${value}\" para ${format} es incorrecto ` +\n `(esperado ${correctCheckDigit}, recibido ${providedCheckDigit}). Se corrige automáticamente (autoFixChecksum=true).`,\n )\n return body + correctCheckDigit\n }\n\n throw new CodeBarChecksumError(\n `Dígito verificador inválido para \"${value}\" (${format}): se esperaba ${correctCheckDigit}, ` +\n `se recibió ${providedCheckDigit}. Pasá autoFixChecksum={true} si preferís que se corrija automáticamente.`,\n )\n }\n }\n\n // Cualquier otra longitud la dejamos pasar tal cual: JsBarcode se encargará\n // de validar y, si corresponde, lanzar su propio error.\n return value\n}\n\n/**\n * Genera un código de barras como PNG en base64 (data URL).\n * Funciona tanto en browser (canvas nativo) como en Node (paquete `canvas`),\n * de forma análoga a como QRGenerator resuelve el logo sobre canvas.\n */\nexport const generateCodeBarAsBase64 = async ({\n value,\n format = \"CODE128\",\n width = 2,\n height = 100,\n displayValue = true,\n text,\n fontOptions = \"\",\n fontSize = 20,\n textMargin = 2,\n textAlign = \"center\",\n textPosition = \"bottom\",\n background = \"#ffffff\",\n lineColor = \"#000000\",\n margin = 10,\n marginTop,\n marginBottom,\n marginLeft,\n marginRight,\n autoFixChecksum = false,\n}: CodeBarOptions): Promise => {\n const cacheOptions = {\n value,\n format,\n width,\n height,\n displayValue,\n text,\n fontOptions,\n fontSize,\n textMargin,\n textAlign,\n textPosition,\n background,\n lineColor,\n margin,\n marginTop,\n marginBottom,\n marginLeft,\n marginRight,\n autoFixChecksum,\n }\n const cacheKey = buildCacheKey(cacheOptions)\n if (barcodeCache.has(cacheKey)) return barcodeCache.get(cacheKey)!\n\n // Se valida/normaliza el checksum ANTES del try/catch genérico y sin\n // atraparlo acá: si el checksum es inválido (y autoFixChecksum es\n // false), queremos que el error suba tal cual hasta quien llamó a esta\n // función, en vez de quedar silenciado como un \"\" genérico. CodeBar.tsx\n // ya tiene su propio try/catch y muestra error.message.\n const normalizedValue = normalizeEanValue(value, format, autoFixChecksum)\n\n try {\n const isBrowser = typeof window !== \"undefined\" && typeof window.document !== \"undefined\"\n\n let canvas: any\n\n if (isBrowser) {\n canvas = document.createElement(\"canvas\")\n } else {\n try {\n const { createCanvas } = await import(\"canvas\")\n // JsBarcode setea el tamaño real del canvas internamente,\n // el valor inicial acá es solo un placeholder.\n canvas = createCanvas(100, 100)\n } catch (e) {\n throw new Error(\n `Canvas no disponible en entorno Node (¿falta instalar el paquete \"canvas\"?): ${\n e instanceof Error ? e.message : String(e)\n }`,\n )\n }\n }\n\n JsBarcode(canvas, normalizedValue, {\n format,\n width,\n height,\n displayValue,\n text,\n fontOptions,\n fontSize,\n textMargin,\n textAlign,\n textPosition,\n background,\n lineColor,\n margin,\n marginTop,\n marginBottom,\n marginLeft,\n marginRight,\n })\n\n const dataUrl = canvas.toDataURL(\"image/png\")\n\n if (!dataUrl || dataUrl === \"data:,\" || !dataUrl.startsWith(\"data:image\")) {\n throw new Error(`Data URL generada es inválida: ${dataUrl}`)\n }\n\n barcodeCache.set(cacheKey, dataUrl)\n return dataUrl\n } catch (error) {\n // Se loguea acá para tener el detalle en consola/servidor, pero el\n // error se re-lanza (no se traga como \"\") para que quien llamó pueda\n // mostrar el mensaje real en vez de un genérico \"no se pudo generar\".\n console.error(\"Error generando código de barras:\", error)\n throw error instanceof Error ? error : new Error(String(error))\n }\n}","import React from \"react\"\nimport { Image, StyleSheet, View } from \"@react-pdf/renderer\"\nimport {\n generateCodeBarAsBase64,\n type CodeBarFormat,\n type CodeBarOptions,\n} from \"./CodeBarGenerator\"\n\ntype ViewBaseProps = React.ComponentProps\n\ninterface CodeBarProps extends Omit, Omit {\n value: string\n width?: number // ancho renderizado del en el PDF\n height?: number // alto renderizado del en el PDF\n style?: any\n format?: CodeBarFormat\n /**\n * Factor por el que se multiplican el width/height internos con los que\n * JsBarcode genera el canvas (por defecto width: 2, height: 100), antes\n * de escalarlo al tamaño final del en el PDF. Subirlo genera un\n * PNG de mayor resolución, evitando que se vea pixelado al imprimirse o\n * hacer zoom. Por ejemplo, resolutionScale={3} genera el canvas al\n * triple de resolución. Default: 3.\n */\n resolutionScale?: number\n}\n\nconst styles = StyleSheet.create({\n container: {\n display: \"flex\",\n alignItems: \"center\",\n justifyContent: \"center\",\n margin: 10,\n },\n})\n\nconst CodeBar: React.FC = ({\n value,\n format = \"CODE128\",\n width = 200,\n height = 80,\n style,\n displayValue = true,\n text,\n fontOptions,\n fontSize,\n textMargin,\n textAlign,\n textPosition,\n background = \"#ffffff\",\n lineColor = \"#000000\",\n margin,\n marginTop,\n marginBottom,\n marginLeft,\n marginRight,\n autoFixChecksum = false,\n resolutionScale = 3,\n ...rest\n}) => {\n // Se pasa como factory function: `@react-pdf/renderer` acepta que `src` sea\n // una función (la invoca y espera su resultado) o directamente una\n // promesa — ver `resolveSource` en `@react-pdf/layout` — mismo enfoque que\n // ChartJS/QR. Nada de useState/useEffect/loading-state acá: ese patrón es\n // para un ciclo de vida de UI en el browser (montaje, re-render por\n // interacción), pero `generatePDF` corre en el backend (incluso en un\n // worker thread) haciendo un único render de punta a punta, así que lo\n // único que hace falta es resolver el data URL antes de serializar el PDF.\n const resolveCodeBarSrc = async (): Promise =>\n generateCodeBarAsBase64({\n value,\n format,\n // width/height acá controlan el módulo/alto internos de JsBarcode, no\n // el tamaño final del (ese lo define el width/height del\n // componente, más abajo). Se multiplican por resolutionScale para que\n // el canvas nazca en mayor resolución y no se vea pixelado al\n // escalarlo/imprimirlo, sin cambiar el tamaño final en el PDF.\n width: 2 * resolutionScale,\n height: 100 * resolutionScale,\n displayValue,\n text,\n fontOptions,\n // Si no se pasa fontSize/textMargin explícito, se escalan junto con\n // las barras (mismos defaults que usa JsBarcode: fontSize 20,\n // textMargin 2) para que el texto no quede desproporcionadamente\n // chico frente a un canvas generado en mayor resolución.\n fontSize: fontSize ?? 20 * resolutionScale,\n textMargin: textMargin ?? 2 * resolutionScale,\n textAlign,\n textPosition,\n background,\n lineColor,\n margin,\n marginTop,\n marginBottom,\n marginLeft,\n marginRight,\n autoFixChecksum,\n })\n\n return (\n \n \n \n )\n}\n\nexport default CodeBar"]}