Add independent MCP PDF report delivery

roll_report_service.py

@@ -0,0 +1,70 @@
+"""Shared authoritative PDF-report service for Flask and MCP adapters."""
+
+from __future__ import annotations
+
+from datetime import datetime
+import json
+from pathlib import Path
+from typing import Any
+
+from pdf_report import (
+    report_from_calculation_result,
+    render_roll_report,
+    safe_report_filename,
+)
+from roll_calculation import calculate_roll
+
+
+UNKNOWN_BUILD_INFO = {
+    "version": "unknown",
+    "branch": "unknown",
+    "commit": "unknown",
+    "timestamp": "unknown",
+}
+
+
+def create_roll_calculation_pdf(
+    calculation_request: Any,
+    *,
+    build_info: dict[str, str],
+) -> tuple[bytes, str, dict[str, Any]]:
+    """Recalculate one request and render the established RollCalc PDF."""
+    result = calculate_roll(calculation_request, build_info=build_info)
+    pdf, filename = create_roll_calculation_pdf_from_result(
+        result,
+        build_info=build_info,
+    )
+    return pdf, filename, result
+
+
+def create_roll_calculation_pdf_from_result(
+    result: dict[str, Any],
+    *,
+    build_info: dict[str, str],
+) -> tuple[bytes, str]:
+    """Render an already-authoritative calculation result using the shared path."""
+    report = report_from_calculation_result(result)
+    generated_at = datetime.now().astimezone()
+    pdf = render_roll_report(
+        report,
+        generated_at=generated_at,
+        build_info=build_info,
+    )
+    article_number = report["article"]["number"] if report["article"] else None
+    return pdf, safe_report_filename(article_number, generated_at)
+
+
+def load_report_build_info(path: str = "build_info.json") -> dict[str, str]:
+    """Load the same optional build metadata shown by Flask-generated reports."""
+    try:
+        raw = json.loads(Path(path).read_text(encoding="utf-8"))
+    except (OSError, json.JSONDecodeError):
+        return UNKNOWN_BUILD_INFO.copy()
+    if not isinstance(raw, dict):
+        return UNKNOWN_BUILD_INFO.copy()
+    build_info = UNKNOWN_BUILD_INFO.copy()
+    for key in build_info:
+        value = raw.get(key)
+        if isinstance(value, str) and value.strip():
+            build_info[key] = value.strip()
+    return build_info