import 'dart:math' as math;

import 'package:flutter_test/flutter_test.dart';
import 'package:observer/detection/detection_result.dart';
import 'package:observer/detection/motion_aggregator.dart';

void main() {
  // 96x64 图，8x8 块 → 每块 12x8 像素

  test('noMotion_returnsEmpty', () {
    final diff = List<int>.filled(96 * 64, 0);
    expect(MotionAggregator.aggregate(diff, 96, 64), isEmpty);
  });

  test('singleBlockMotion_detectsRegion', () {
    final diff = List<int>.filled(96 * 64, 0);
    for (var y = 24; y < 32; y++) {
      for (var x = 24; x < 36; x++) {
        diff[y * 96 + x] = 1;
      }
    }
    final regions = MotionAggregator.aggregate(diff, 96, 64);
    expect(regions.length, 1);
    final r = regions[0];
    expect(r.left, lessThanOrEqualTo(24 / 96));
    expect(r.right, greaterThanOrEqualTo(36 / 96));
    expect(r.top, lessThanOrEqualTo(24 / 64));
    expect(r.bottom, greaterThanOrEqualTo(32 / 64));
  });

  test('twoSeparateMotions_detectsTwoRegions', () {
    final diff = List<int>.filled(96 * 64, 0);
    for (var y = 0; y < 8; y++) {
      for (var x = 0; x < 12; x++) {
        diff[y * 96 + x] = 1;
      }
    }
    for (var y = 48; y < 64; y++) {
      for (var x = 72; x < 96; x++) {
        diff[y * 96 + x] = 1;
      }
    }
    expect(MotionAggregator.aggregate(diff, 96, 64).length, 2);
  });

  test('globalNoise_filteredOut', () {
    final diff = List<int>.filled(96 * 64, 0);
    final rnd = math.Random(42);
    for (var i = 0; i < diff.length; i++) {
      if (rnd.nextDouble() < 0.1) diff[i] = 1;
    }
    expect(MotionAggregator.aggregate(diff, 96, 64), isEmpty);
  });

  test('centerInRegion_matches', () {
    final box = DetectionResult(
        label: 'hare',
        score: 0.30,
        left: 0.2,
        top: 0.3,
        right: 0.4,
        bottom: 0.5);
    expect(MotionAggregator.centerInRegion(box, MotionRegion(0.1, 0.2, 0.5, 0.6)),
        isTrue);
    expect(MotionAggregator.centerInRegion(box, MotionRegion(0.6, 0.7, 0.9, 0.9)),
        isFalse);
  });
}