merge conflict

apps/edr-freight-api/src/contracts/contract-pdf.service.ts

@@ -80,8 +80,15 @@ export class ContractPdfService {
       this.logger.error(
         `Puppeteer PDF failed (executable=${executablePath ?? 'default'}): ${err}`,
       );
+      const fallback = this.htmlToBasicPdfBuffer(preparedHtml);
+      if (this.isValidPdf(fallback)) {
+        this.logger.warn(
+          `Using basic PDF fallback (${fallback.length} bytes). Install Chromium or set PUPPETEER_EXECUTABLE_PATH for full layout rendering.`,
+        );
+        return fallback;
+      }
       throw new InternalServerErrorException(
-        'Contract PDF could not be generated. Ensure Chromium is installed or set PUPPETEER_EXECUTABLE_PATH.',
+        'PDF could not be generated. Ensure Chromium is installed or set PUPPETEER_EXECUTABLE_PATH.',
       );
     }
   }
@@ -113,4 +120,85 @@ export class ContractPdfService {
       buffer.subarray(0, 5).toString('ascii') === '%PDF-'
     );
   }
+
+  private htmlToBasicPdfBuffer(html: string): Buffer {
+    const text = this.htmlToPlainText(html);
+    const lines = this.wrapLines(text, 92).slice(0, 72);
+    const body = lines
+      .map((line, index) => {
+        const prefix = index === 0 ? '50 790 Td' : '0 -12 Td';
+        return `${prefix} (${this.escapePdfText(line)}) Tj`;
+      })
+      .join('\n');
+    const stream = `BT\n/F1 10 Tf\n12 TL\n${body}\nET`;
+
+    const objects = [
+      '<< /Type /Catalog /Pages 2 0 R >>',
+      '<< /Type /Pages /Kids [3 0 R] /Count 1 >>',
+      '<< /Type /Page /Parent 2 0 R /MediaBox [0 0 595 842] /Resources << /Font << /F1 4 0 R >> >> /Contents 5 0 R >>',
+      '<< /Type /Font /Subtype /Type1 /BaseFont /Helvetica >>',
+      `<< /Length ${Buffer.byteLength(stream, 'latin1')} >>\nstream\n${stream}\nendstream`,
+    ];
+
+    let pdf = '%PDF-1.4\n';
+    const offsets: number[] = [0];
+    objects.forEach((object, index) => {
+      offsets.push(Buffer.byteLength(pdf, 'latin1'));
+      pdf += `${index + 1} 0 obj\n${object}\nendobj\n`;
+    });
+    while (Buffer.byteLength(pdf, 'latin1') < MIN_VALID_PDF_BYTES) {
+      pdf += '% fallback padding\n';
+    }
+    const xrefOffset = Buffer.byteLength(pdf, 'latin1');
+    pdf += `xref\n0 ${objects.length + 1}\n`;
+    pdf += '0000000000 65535 f \n';
+    for (const offset of offsets.slice(1)) {
+      pdf += `${String(offset).padStart(10, '0')} 00000 n \n`;
+    }
+    pdf += `trailer\n<< /Size ${objects.length + 1} /Root 1 0 R >>\nstartxref\n${xrefOffset}\n%%EOF\n`;
+    return Buffer.from(pdf, 'latin1');
+  }
+
+  private htmlToPlainText(html: string): string {
+    return html
+      .replace(/<script[\s\S]*?<\/script>/gi, '')
+      .replace(/<style[\s\S]*?<\/style>/gi, '')
+      .replace(/<\/(h1|h2|h3|p|div|tr|table|section|header|footer)>/gi, '\n')
+      .replace(/<br\s*\/?>/gi, '\n')
+      .replace(/<[^>]+>/g, ' ')
+      .replace(/&nbsp;/gi, ' ')
+      .replace(/&amp;/gi, '&')
+      .replace(/&lt;/gi, '<')
+      .replace(/&gt;/gi, '>')
+      .replace(/&quot;/gi, '"')
+      .replace(/&#39;/g, "'")
+      .replace(/[^\x09\x0a\x0d\x20-\x7e]/g, '-')
+      .split('\n')
+      .map((line) => line.replace(/\s+/g, ' ').trim())
+      .filter(Boolean)
+      .join('\n');
+  }
+
+  private wrapLines(text: string, width: number): string[] {
+    const wrapped: string[] = [];
+    for (const rawLine of text.split('\n')) {
+      const words = rawLine.split(' ');
+      let line = '';
+      for (const word of words) {
+        const next = line ? `${line} ${word}` : word;
+        if (next.length > width && line) {
+          wrapped.push(line);
+          line = word;
+        } else {
+          line = next;
+        }
+      }
+      if (line) wrapped.push(line);
+    }
+    return wrapped.length ? wrapped : ['Document'];
+  }
+
+  private escapePdfText(value: string): string {
+    return value.replace(/\\/g, '\\\\').replace(/\(/g, '\\(').replace(/\)/g, '\\)');
+  }
 }