// Author: fruit.com.cn

import 'dart:ui' as ui;

import 'package:flutter/foundation.dart';
import 'package:flutter/material.dart';
import 'package:flutter/rendering.dart';

class PlayerFrameCapture {
  const PlayerFrameCapture._();

  static const int budgetMilliseconds = 32;

  static Future<Uint8List?> capture({
    required BuildContext context,
    required GlobalKey boundaryKey,
    required String source,
  }) async {
    final boundary = boundaryKey.currentContext?.findRenderObject();
    if (boundary is! RenderRepaintBoundary) {
      _log('[player-entry] phase=frame-capture-unavailable source=$source');
      return null;
    }
    final stopwatch = Stopwatch()..start();
    try {
      final pixelRatio = MediaQuery.devicePixelRatioOf(
        context,
      ).clamp(1.0, 2.0).toDouble();
      final image = await boundary.toImage(pixelRatio: pixelRatio);
      final data = await image.toByteData(format: ui.ImageByteFormat.png);
      image.dispose();
      if (stopwatch.elapsedMilliseconds > budgetMilliseconds) {
        _log(
          '[player-entry] phase=frame-capture-over-budget source=$source '
          'ms=${stopwatch.elapsedMilliseconds} budget_ms=$budgetMilliseconds',
        );
      }
      if (data == null) {
        _log('[player-entry] phase=frame-capture-empty source=$source');
        return null;
      }
      final bytes = data.buffer.asUint8List(
        data.offsetInBytes,
        data.lengthInBytes,
      );
      _log(
        '[player-entry] phase=frame-captured source=$source '
        'bytes=${bytes.length} ms=${stopwatch.elapsedMilliseconds}',
      );
      return bytes;
    } catch (error) {
      _log(
        '[player-entry] phase=frame-capture-failed source=$source '
        'error=$error',
      );
      return null;
    }
  }

  static void _log(String message) {
    if (kDebugMode) debugPrint(message);
  }
}