// lib/editor/pdf/pdfrx_page_document_source.dart
//
// Production [PageDocumentSource] backed by a pdfrx PdfDocument — the thin
// device-side adapter that feeds real page geometry into the (pure, tested)
// continuous-single layout math.
//
// SOURCE-PIN (plan SF4 / P0.5 step 12): this file references the exact pdfrx
// 2.4.4 page-geometry API (`PdfDocument.pages`, `PdfPage.width`, `PdfPage.height`).
// Because it lives under lib/editor/, the Oracle's `flutter analyze lib/editor`
// type-checks it against the installed pdfrx on every run — so a version bump
// that renames/retypes these members FAILS analysis instead of silently
// drifting. (Static pin only: exercising it needs pdfium at runtime, which is
// the device-gated path.)

import 'dart:ui' show Size;

import 'package:pdfrx/pdfrx.dart';

import 'pdf_document_source.dart';

/// Snapshots page sizes (PDF points) from an open pdfrx [PdfDocument] so the
/// layout layer can read them synchronously (pdfrx loads pages asynchronously;
/// once open, `document.pages[i].width/height` are available).
class PdfrxPageDocumentSource implements PageDocumentSource {
  const PdfrxPageDocumentSource.fromSizes(this._sizes);

  /// Snapshot the intrinsic size of every page from an open [document].
  factory PdfrxPageDocumentSource.fromDocument(PdfDocument document) {
    final sizes = document.pages
        .map((page) => Size(page.width, page.height))
        .toList(growable: false);
    return PdfrxPageDocumentSource.fromSizes(sizes);
  }

  final List<Size> _sizes;

  @override
  int get pageCount => _sizes.length;

  @override
  Size pageSize(int index) => _sizes[index];
}
