import '../models/note.dart';
import '../models/pen_tool.dart';
import 'database_service.dart';
import 'ocr_engine.dart';
import 'stroke_rasterizer.dart';

/// Runs OCR locally: typed text from strokes + handwriting via platform OCR.
class OcrService {
  /// Extract searchable text from [note] and merge into the local FTS index.
  Future<void> processNote(Note note) async {
    final parts = <String>[];

    for (final stroke in note.strokes) {
      if (stroke.tool == PenTool.text &&
          stroke.textContent != null &&
          stroke.textContent!.trim().isNotEmpty) {
        parts.add(stroke.textContent!.trim());
      }
    }

    final handwritingStrokes = note.strokes
        .where(
          (s) =>
              s.tool != PenTool.eraser &&
              s.tool != PenTool.text &&
              s.points.isNotEmpty,
        )
        .toList();

    if (handwritingStrokes.isNotEmpty) {
      final png = await StrokeRasterizer.render(handwritingStrokes);
      if (png != null) {
        final recognized = await OcrEngine.recognizeImage(png);
        if (recognized != null && recognized.isNotEmpty) {
          parts.add(recognized);
        }
      }
    }

    final combined = parts.join(' ').trim();
    if (combined.isEmpty) return;

    final db = await DatabaseService.getInstance();
    await db.appendOcrToFts(note.id, combined);
  }
}